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Article

Energy Quality of Corn Biomass from Gasoline-Contaminated Soils Remediated with Sorbents

Department of Soil Science and Microbiology, Faculty of Agriculture and Forestry, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Energies 2024, 17(21), 5322; https://doi.org/10.3390/en17215322
Submission received: 28 September 2024 / Revised: 22 October 2024 / Accepted: 23 October 2024 / Published: 25 October 2024
(This article belongs to the Special Issue Sustainable Energy Development in Liquid Waste and Biomass)

Abstract

:
Soil contaminated with petroleum-derived products should be used to cultivate energy crops. One such crop is Zea mays. Therefore, a study was performed to determine the suitability of Zea mays biomass obtained from gasoline-contaminated soil for energy purposes. The analysis included determining the heat of combustion and calorific value of the biomass, as well as the content of nitrogen, carbon, hydrogen, oxygen, sulfur, and ash in the biomass. Additionally, the suitability of vermiculite, dolomite, perlite, and agrobasalt for the phytostabilization of gasoline-contaminated soil was evaluated. It was found that the application of sorbents to gasoline-contaminated soil significantly reduced the severe negative effects of this petroleum product on the growth and development of Zea mays. Gasoline contamination of the soil caused a significant increase in ash, nitrogen, and sulfur, along with a decrease in carbon and oxygen content. However, it had no negative effect on the heat of combustion or calorific value of the biomass, although it did reduce the energy production from Zea mays biomass due to a reduction in yield. An important achievement of the study is the demonstration that all the applied sorbents have a positive effect on soil stabilization, which in turn enhances the amount of Zea mays biomass harvested and the energy produced from it. The best results were observed after the application of agrobasalt, dolomite, and vermiculite on gasoline-contaminated soil. Therefore, these sorbents can be recommended for the phytostabilization of gasoline-contaminated soil intended for the cultivation of energy crops.

1. Introduction

Biomass as an alternative energy source is becoming increasingly important in the context of efforts to combat global warming and reduce the use of fossil fuels [1,2,3]. This is justified by the fact that biobased products emit fewer greenhouse gases compared to fossil feedstocks [4,5]. Plant biomass first garnered attention as a sustainable energy source in the 1970s [4,5,6,7,8,9], and interest in the subject has grown as efforts to mitigate climate change have intensified. Current research on biomass focuses on several primary objectives: reducing greenhouse gas emissions, decreasing fossil fuel exploitation, and increasing energy self-sufficiency [10,11,12]. Biomass energy production holds significant potential to reduce society’s dependence on fossil fuels [2,10].
The calorific value of biomass is a key parameter, particularly when considering its use as an energy source [13]. Biomass derived from agricultural residues has a calorific value of approximately 1.26 × 104 MJ Mg−1, which is half the calorific value of coal and one-third that of diesel [7,14]. The calorific value of petroleum derivatives ranges from 41.5 to 47.0 MJ kg−1 [15]. According to Amaral [16], gasoline is composed of a variety of hydrocarbons with different molecular structures. Molecules with a higher number of atoms have higher boiling points, and their calorific value generally increases, with hydrogen having a higher calorific value compared to carbon. According to Zaharin et al. [17], gasoline blends with ethanol and butanol (E10, E10B5, E10B10, and E10B15) result in lower calorific values, ranging from 41.7 MJ kg−1 to 43.1 MJ kg−1.
The calorific value of biomass is significantly lower than that of gasoline [7]. The calorific value of gasoline is almost four times higher than that of biomass, indicating the relatively lower efficiency of biomass as a fuel in terms of the energy released during combustion [13]. Nevertheless, biomass has other advantages, such as a lower impact on greenhouse gas emissions, which can compensate for its lower heating value [18].
One of the main applications of biomass is the production of biofuels such as ethanol and biodiesel [2,19,20]. The European Parliament and other international institutions promote the development of advanced biofuels, which can be produced from agricultural residues, such as straw or crop leftovers [20,21,22,23,24]. The use of such feedstocks minimizes the impact on land use changes and does not compete with food production. In recent years, there has been particular interest in the use of corn residues, which exhibit low resistance to bioconversion processes [9,25]. This means that corn residues, such as stalks, leaves, or cobs, are relatively easy to convert into biofuels or other bioproducts through biochemical processes, such as fermentation or enzymatic decomposition. The chemical structure of plant residues is less complex and more susceptible to degradation, making bioconversion more efficient and leading to higher yields in the production of bioethanol and other forms of renewable energy [26,27]. As a result, maize biomass is one of the most popular feedstocks for biogas production in the energy sector, particularly in countries such as Germany and Austria, where biogas production is well developed [28,29]. Similarly, maize silage, from both whole plant and grain, is highly valued for its energy content, particularly in Poland, where it is used not only for biogas production but also for ethanol [30]. The growing interest in maize biomass, driven by its high biomass yield, makes it an attractive option for biogas plants and contributes to the reduction in greenhouse gas emissions by replacing fossil fuels with renewable energy sources.
One of the challenges associated with the use of biomass for energy is soil degradation [31,32,33], caused by the over-exploitation of agricultural land and the use of pesticides and herbicides [33,34,35,36]. Plants, sorbents, and soil microorganisms can play a crucial role in mitigating these negative effects without reducing crop yields. Finding effective methods to remediate soils contaminated with petroleum-derived products, such as gasoline, remains a major challenge [37,38].
The use of adsorbent materials capable of binding and retaining contaminants on their surface, as noted by Kapoor and Zdarta [39], has proven effective in reducing the bioavailability of toxic compounds in the soil. Petroleum products can lead to soil degradation, reduced fertility, and adverse effects on soil microbiomes and biogeochemical processes occurring in soil formations. Vermiculite, dolomite, perlite, and agrobasalt are four materials that have shown promising properties for improving the quality of soils contaminated with petroleum-derived products. Vermiculite, a natural mineral with high water and nutrient absorption capacity, can support the development of soil microorganisms by improving soil structure and increasing its water-holding capacity [40,41]. Dolomite, a mineral composed mainly of calcium and magnesium carbonate, can neutralize soil acidity [42,43]. Due to its porous structure, perlite increases air circulation in the soil. It has the ability to store water and nutrients. It consists mainly of silica (SiO2) and oxides of potassium, magnesium, and calcium, which are essential for the development of the plant’s root system [44,45,46]. Agrobasalt, a by-product of the basalt industry, contains numerous micro- and macroelements, such as potassium, magnesium, calcium, and iron, and can stimulate enzymatic activity in the soil, improve soil fertility, and support plant growth [47,48].
Consequently, the search for effective methods of remediating contaminated soils is of paramount importance, as abiotic factors influence the derivatives and end products of petroleum substance degradation. Sorbents can prevent the penetration of contaminants, along with water and oxygen, into deeper soil profiles, thereby affecting permeability, pH levels, and nutrient availability [49,50,51,52,53,54].
The aim of this study was to determine the suitability of Zea mays biomass from gasoline-contaminated soils for energy purposes. The analysis included the determination of the heat of combustion and the calorific value of the biomass, as well as the content of nitrogen, carbon, hydrogen, oxygen, sulfur, and ash in the biomass. Additionally, the effectiveness of vermiculite, dolomite, perlite, and agrobasalt in the phytostabilization of soil subjected to gasoline contamination was also assessed. This research objective prompted us to formulate the following hypotheses: (1) the energy value of Zea mays biomass is determined by its content of non-fuel elements; (2) the heat of combustion and calorific value of Zea mays biomass are functions of soil contamination with gasoline; (3) the amount of energy extracted from Zea mays biomass depends on soil supplementation with sorbents.

2. Materials and Methods

2.1. Research Design

The subject of the study was soil taken from an agricultural field from a depth of 0 to 20 cm. This soil was formed from loamy sand. Such soils take up an area of about 50% of arable land in Poland. Based on the classification by the International Union of Soil Sciences [55], this soil is identified as Eutric Cambisol. Its granulometric composition was as follows: sand—75.68%; silt—23.08%; clay—1.24%. The content of organic carbon (Corg) was 9.29 g, total nitrogen (NTotal)—1.22 g, and pHKCl—4.2. The study was carried out in the vegetation hall in a pot experiment in 4 replicates. Plastic pots were used for the experiment, the volume of which allowed to fill them with soil in the amount of 3.2 kg. The experiment was carried out in two series: uncontaminated soil and soil contaminated with unleaded gasoline 95 at 0 and 24 cm3 kg−1 of soil. Zea mays of the DS1897B variety (producer Pioneer, Warsaw, Poland) and the following sorbents were used for phytostabilization of gasoline-contaminated soil: vermiculite with a fraction of 1–5 mm (producer Sobex, Drezdenko, Poland), dolomite with a fraction of 0.5–1 mm (producer Sobex, Drezdenko, Poland), perlite with a fraction of 3–6 mm (producer Biovita Ltd., Tenczynek, Poland), and agrobasalt with a fraction of 1–7 mm (producer Biovita Sp. z o.o., Tenczynek, Poland). The sorbents used were applied in amounts of 0 and 10 g kg−1 d.m. of soil (Figure 1). Unleaded gasoline 95 was purchased at a PKN Orlen (Poland) gas station. Its density varies from 0.720 to 0.775 g cm−3, and its sulfur content is a maximum of 10 mg kg−1. The characteristics of the petroleum substance are available on the PKN Orlen website [56].
In the experiment, homogeneous fertilization with macronutrients was applied in the amount (mg kg−1 d.m. of soil): N—225 in the form of N2H4CO, P—50 in the form of KH2PO4, K—150 in the form of KH2PO4 and KCl, and Mg—15 in the form of MgSO4 × 7H2O. Three days after packing the soil, eight seeds of Zea mays each were sown in pots. When the plants germinated, five plants were left in each pot.
The growing period of the plants was 60 days, but harvesting of the aboveground parts and roots of corn was carried out at stage 51 of the Biological Federal Institute, Bundessortenamt and Chemie (BBCH) (Figure 2).

2.2. Laboratory Analyzes

After harvesting Zea mays at BBCH stage 51 and determination of biomass, the plants were ground and dried. The plant samples were then milled using a laboratory grinder (Retsch SM 200, Haan, Germany) and a sieve with a mesh diameter of 0.5 mm. The next step was to determine the heat of combustion (Q), heating value (Hv), and energy production (Yep) of the Zea mays biomass (Figure 3). The determination of Q was carried out according to the procedure described in PN-EN ISO 18125:2017 [57], and the calorific value (Hv) of Zea mays was calculated according to the formula of Kopetz et al. [58].
In order to characterize the biomass of plants for energy purposes, its carbon (C), hydrogen (H), sulfur (S), nitrogen (N), oxygen (O), and ash contents were determined (Figure 4). The contents of C, H, and N were determined according to PN-EN ISO 16948:2015-07 [59], S—PN-G-04584:2021 [60] and PN-EN ISO 16994:2016-10 [61], and ash was determined according to PN-EN ISO 18122:2016-01 [62].

2.3. Statistical Data Processing and Analysis

In order to evaluate the effects of gasoline (G) and vermiculite (V), dolomite (D), perlite (P), and agrobasalt (A) on Zea mays biomass, its Q, Hv, and Yep, as well as the content of N, C, H, S, O, and ash in the biomass, influence indices were calculated using formulae presented in our previous publications [52,63,64,65]. The data were illustrated on heat maps using the RStudio 2023.06.0 [66] with the R 4.2.2 addition [67] and the gplots library [68]. Statistical analysis of the results was performed using the Statistica 13.0 package [69].
Tukey’s test, principal component analysis (PCA), and Pearson’s simple correlation coefficients were used for this purpose. The coefficients of η2 were also calculated and presented in a pie chart using the Circos 0.68 package [70]. All statistical analyses were performed at a significance level of p < 0.05.

3. Results

3.1. Zea mays Biomass

Soil contamination with gasoline revealed the sensitivity of Zea mays to this xenobiotic (Table 1, Figure 5). Its application to the soil reduced the parameters characterized by the plant (Ya, Yr) by 83% and 84%, respectively. Soil not contaminated with gasoline gave an average yield of 70.26 g d.m. per pot for aerial parts and 7.52 g d.m. per pot for roots, irrespective of the sorbents used (Table 1). The ratio of Ya biomass to Yr biomass was 9.43, and the greenness index (SPAD) was 43.87. On the other hand, the soil contaminated with gasoline yielded Ya at 24.45 g d.m. per pot and Yr at 1.80 g d.m. per pot. The ratio of Ya biomass to Yr biomass was 13.33, and the SPAD index was 45.73. A slight stimulating potential of the sorbents against Zea mays was found in the uncontaminated soil. The exception was perlite, which reduced the amount of Ya biomass by 12%.
On the other hand, in a series of experiments where the soil was contaminated with gasoline, all the sorbents (vermiculite, dolomite, perlite, and agrobasalt) had a positive effect and significantly reduced the toxic effects of this contaminant on Zea mays. For example, the use of agrobasalt in gasoline-contaminated soil increased the amount of Ya biomass by 2.6 times, dolomite by 2.4 times, vermiculite by 2.1 times, and perlite by 1.6 times. The application of sorbents to uncontaminated soil had no significant effect on root biomass, whereas it increased the size of Zea mays biomass in gasoline-contaminated soil. Thus, the sorbents used in the study were very effective in reducing the negative effects of gasoline on the growth and development of the plant under study. The above-mentioned relationships were also reflected in the yield ratio of aboveground parts to plant roots, which, in the gasoline-contaminated series, was highest in the sites supplemented with vermiculite, dolomite, agrobasalt, and perlite, respectively. The above statements are confirmed by the results shown in Figure 5. The positive indices of the effect of sorbents on the yield of Zea mays grown on gasoline-contaminated soil clearly demonstrate that they can be used to mitigate the effects of this contaminant on this plant. Their values for Ya biomass ranged from 0.584 (perlite) to 1.599 (agrobasalt), and for Yr biomass from 0.571 (vermiculite) to 1.028 (agrobasalt).

3.2. Contents of Ash, Nitrogen, Carbon, Hydrogen, Sulfur and Oxygen in Aboveground Parts of Zea mays

Both gasoline soil contamination and sorbent application had an effect on the ash content and non-ash elements in the aboveground biomass of Zea mays (Table 2). Soil contamination with gasoline caused a significant increase in sulfur, nitrogen, and ash and a decrease in carbon and oxygen. For maize grown on uncontaminated soil, soil supplementation with dolomite and agrobasalt resulted in a significant increase in ash content, dolomite and perlite in nitrogen content, and perlite and agrobasalt in oxygen content. Dolomite and perlite contributed to a significant reduction in hydrogen content, while these sorbents had no statistically significant effect on sulfur content. The effect of sorbents on the content of ash and non-ash elements in maize biomass extracted from gasoline-contaminated soil was slightly different. Namely, vermiculite caused an increase in ash content, dolomite, perlite, and agrobasalt—nitrogen, perlite—sulfur and all sorbents—oxygen. In turn, all sorbents contributed to a decrease in carbon content: vermiculite, dolomite and perlite—hydrogen, dolomite and perlite—ash, and dolomite—sulfur.
The described changes in the chemical composition of maize biomass extracted from soil supplemented and unsupplemented with sorbents and contaminated and uncontaminated with gasoline are well represented by the indexes of influence of gasoline (G) and sorbents on the content of ash and elements determining the energy value of the aboveground biomass of Zea mays presented in Figure 6. These indices show that the chemical composition of the biomass was more strongly influenced by gasoline than by sorbents. In the case of petroleum substances, the influence index for ash was 0.939, N—1.035, and S—1.322, while for C and O it was negative, respectively: −0.037 and −0.140. These indexes were significantly higher than the sorbent influence indices. The exception was the sorbent influence indices for C. Their values were low and almost always negative.

3.3. Energy Value of Aboveground Parts of Zea mays

All sorbents contributed to increasing the calorific value (Hv) and heat of combustion (Q) of the biomass of aboveground parts of maize grown on soil not contaminated with gasoline (Table 3). The highest Hv value was found under perlite (15.578 MJ kg−1) and dolomite (15.563 MJ kg−1). The heat of combustion was also highest in plant biomass extracted from soil supplemented with the mentioned sorbents. Perlite increased Q from 18.710 MJ to 19.268 MJ, while dolomite increased Q from 18.710 MJ to 19.250 MJ. The Hv and Q values of maize grown on gasoline-contaminated soil were increased only by the effect of dolomite, whereas they were decreased by the effect of vermiculite. In this series of experiments, both perlite and agrobasalt did not change the Hv and Q values. Since gasoline greatly reduced the growth and development of Zea mays, the amount of energy extracted (Yep) from maize on contaminated soil was reduced by 0.927 MJ per pot. This was a 5.8-fold reduction. The introduction of sorbents into gasoline-contaminated soil significantly increased Yep yields, with agrobasalt and dolomite increasing Yep production the most. The impact index for the former sorbent was 1.603, and the latter 1.388 (Figure 7). Such a spectacular effect of sorbents was not observed for maize biomass produced on uncontaminated soil.

3.4. Interactions Between Zea mays Yield and Its Energy Value

Gasoline (G) had a significantly greater effect on the dependent variable than the sorbents used (Figure 8). This petroleum-based substance influenced up to 96% of the yield of the underground parts of the plants, 93% of the carbon content of the plant biomass, and the ash content. It affected the energy yield of the biomass (Yep) by 72%, the calorific value of the biomass (Hv) by 68%, the yield of the aboveground parts of the plant (Ya) by 65%, the sulfur content (S) by 58%, and the oxygen content (O) by 55%. Sorbents, on the other hand, reduced the hydrogen content (H) by 85%, the heat of combustion (Q) by 74%, and the nitrogen content of Zea mays biomass by 52%. Only the leaf greenness index was more dependent on the combined use of sorbents and gasoline (S × G).
Calculated Pearson’s simple correlation coefficients (Figure 9) and principal component analysis (PCA) (Figure 10) allowed us to determine the strength of the interaction between the parameters studied. Thus, the amount of energy produced (Yep) was significantly positively correlated with Zea mays biomass, C and O content, and significantly negatively with N, S, and ash content. The heat of combustion (Q) and the calorific value (Hv) of plant biomass were negatively correlated with the H content, while they did not form significant correlations with the other parameters studied. There was a significant positive correlation between N content and ash and S content and C, O, and H content, and a negative correlation between C and O and ash, S, and N content.

4. Discussion

Petroleum-derived products are toxic to all soil organisms [71,72] and plants [54,73,74,75]. Therefore, rapid and effective detoxification of these soils is important [37,76,77]. Our research shows that Zea mays is highly susceptible to the destructive effects of gasoline. Under the influence of this pollutant, plant biomass decreased by 83%. The negative effect of gasoline on maize growth and development was significantly reduced by all the sorbents used in the study, i.e., vermiculite, agrobasalt, perlite, and dolomite. This is probably due to the adsorption of gasoline by these sorbents, which limited the direct contact of gasoline with the plant roots. According to the literature [52,70,78,79,80,81], their effectiveness in revitalizing soils depends on the type of sorbent. In our study, despite the positive effectiveness of all sorbents, agrobasalt and dolomite were the most effective. The effect coefficients of these sorbents on Zea mays biomass were very high, being 1.599 for the first sorbent and 1.374 for the second, respectively. The effectiveness of agrobasalt and dolomite may be due to their ability to neutralize contaminants and improve soil properties by providing both calcium and magnesium, which may benefit plant growth and pH regulation [82]. According to Huang et al. [83], the particle size of the sorbent is also one of the main factors affecting its effectiveness in neutralizing soil acidity, as the reaction rate between calcium material and H+ in the soil depends on the specific surface area. Cai et al. [84] also observed that dolomite accelerates the mineralization of nitrogenous organic compounds, thereby improving the respiration of acidic soils. On the other hand, Wu et al. [82] observed that smaller dolomite particles have a larger specific surface area, which may increase their ability to adsorb pollutants and improve soil structure; larger agrobasalt particles have a greater ability to adsorb pollutants [85,86]. These factors clearly influence interactions with the soil microbiome by promoting the growth of microorganisms that stimulate Zea mays growth. This is due to the different sorption capacity and chemical composition of these sorbents [87,88,89,90,91,92,93].
The negative effect of gasoline on Zea mays was not only limited to biomass production but also caused changes in its chemical composition. Under its influence, the content of N, S, and ash in the biomass increased, and the content of C and O decreased. The increase in the content of N, S, and ash was much greater than the decrease in the content of C and O. The index of the effect of gasoline on the content of S, N, and ash was 1.322, 1.035, and 0.939, respectively. Changes in the chemical composition of the biomass of gasoline-treated plants may result from the direct toxic effect of this substance on the plant, disturbances in the uptake of ions by the plants, and dysfunctions in the ion balance [94,95]. The above considerations are only appropriate for this research. However, it should be taken into account that in environmental research other issues come into play that are extremely important for the existence of ecosystems and consequently for human and animal health. These include the contamination of groundwater with benzene, toluene, ethylbenzene, and xylene (BTEX), which stresses all organisms that use the resource [96,97]. The significant amounts of carbon, hydrogen, and oxygen, as well as nitrogen and sulfur, in Zea mays biomass are also important for energy production. Through combustion, fermentation, or gasification, these components can be converted into heat, electricity, or biofuels such as bioethanol [98,99].
In our study, despite the variable effects of gasoline on the chemical composition of the plant, we found a positive effect of this substance on the heat of combustion and the calorific value of the biomass. Of course, this did not bridge the differences between the energy production of maize grown on uncontaminated and contaminated soil, due to the negative effect of this pollutant on the yield of corn, and thus on the amount of biomass and energy obtained [100,101].
Energy production (Yep) was positively affected by all sorbents. It was increased most by agrobasalt (influence factor of 1.603) and least by perlite (influence factor of 0.583). Thus, they can play an important role in the cultivation of plants on soils degraded with organic compounds for energy purposes. Also, Zahed et al. [102]; Vasilyeva et al. [50]; Wyszkowski and Kordala [103]; Sabitov et al. [104]; Wyszkowski et al. [105]; and Wyszkowska et al. [106] demonstrated the usefulness of sorbents (biocarbon, zeolite, kaolinite, vermiculite, diatomite, bentonite, activated carbon, molecular sieve, halloysite, sepiolite, expanded clay, biochar, and alginite) in the phytostabilization of soil contaminated with petroleum-derived products. According to Zhang and Liang [107], Qu et al. [108], and Vocciante et al. [109], the amount of energy extracted from Zea mays biomass depends on the soil properties, so sorbents introduced into the soil may help to modify the soil structure, increasing its capacity to retain water and nutrients, thus influencing higher biomass production. According to Ho et al. [110]; Atero-Calvo et al. [111]; Wyszkowski and Kordala [112]; and Kamenchuk et al. [113], sorbents can influence the availability of elements that are key to the intensity of the photosynthetic process, thereby increasing biomass and energy while offsetting the stress caused by soil contamination [114].
Both our results and those of other authors [100,115,116] indicate the significant potential of Zea mays to replace fossil fuels. Maize grown on contaminated soils has a high energy potential as an alternative energy source. A study by Morales-Máximo et al. [115] also demonstrates that Zea mays biomass has a high energy potential as an alternative energy source. The average calorific value determined by these authors in samples of plant material was 17.6 MJ kg−1, and in our study, it ranged from 18.7 MJ kg−1 to 19.3 MJ kg−1, which is at a comparable level compared to other biofuels [117,118,119]. Replacing fossil fuels with Zea mays biomass has numerous environmental benefits. Biomass combustion is carbon dioxide-neutral, as the CO2 released during combustion is offset by the CO2 absorbed by the plant during photosynthesis [4,98,99]. Additionally, biomass production can help reduce emissions of other harmful gases, such as nitrogen and sulfur oxides, which are typical of fossil fuel combustion [115,118,120].
Despite its many benefits, biomass production from Zea mays also poses several challenges. One of the main problems is competition for land and water resources with food production [121,122]. Therefore, it is important to develop technologies and practices that minimize these conflicts, for example by using marginal soils that are not suitable for food production. Further research into the genetic improvement of maize may in the future lead to varieties with higher energy yields and better resistance to environmental stresses [123]. Summarizing the results of our study, it can be concluded that Zea mays biomass has great potential as a sustainable energy source that can contribute to reducing fossil fuel consumption. However, it is crucial that biomass production be carried out in a sustainable manner, taking into account both environmental and social aspects.

5. Conclusions

Gasoline creates unfavorable conditions for the growth and development of Zea mays. Growing maize on non-remediated soil limits its use for energy purposes. On the other hand, the application of agrobasalt, dolomite, vermiculite, and perlite to contaminated soil enhances both biomass production and the amount of energy obtained from it. The amount of energy obtained from Zea mays was significantly positively correlated with carbon and oxygen content and negatively correlated with nitrogen, sulfur, and ash content. Our research shows that all the sorbents tested represent a promising strategy for managing sites contaminated with petroleum-derived products.

Author Contributions

Conceptualization, J.W., A.B., M.Z. and J.K.; methodology, J.W., A.B., M.Z. and J.K.; formal analysis, J.W., A.B., M.Z. and J.K.; investigation, J.W., A.B., M.Z. and J.K.; writing—original draft preparation, J.W., A.B. and M.Z.; writing—review and editing, J.W., A.B., M.Z. and J.K.; visualization, J.W., A.B., M.Z. and J.K.; supervision, J.K. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the University of Warmia and Mazury in Olsztyn, Faculty of Agriculture and Forestry, Department of Soil Science and Microbiology (grant No. 30.610.006-110) and project financially supported by the Minister of Education and Science in the range of the program entitled Funded by the Minister of Science under the Regional Initiative of Excellence Program.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Conflicts of Interest

The authors declare no conflicts of interest.

Abbreviations

Us—uncontaminated soil, V—uncontaminated soil with the addition of vermiculite, D—uncontaminated soil with the addition of dolomite, P—uncontaminated soil with the addition of perlite, A—uncontaminated soil with the addition of agrobasalt, G—soil contaminated with gasoline, V_G—soil contaminated with gasoline with the addition of vermiculite, D_G—soil contaminated with gasoline with the addition of dolomite, P_G—soil contaminated with gasoline with the addition of perlite, A_G—soil contaminated with gasoline with the addition of agrobasalt. Ya—yield of aerial parts, Yr—yield of roots, Ya/Yr—the ratio of aboveground parts yield to plant roots, SPAD—greenness index, Q—heat of combustion, Hv—calorific value, Yep—energy yield, C —carbon, H—hydrogen, S—sulfur, N—nitrogen, O—oxygen.

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Figure 1. Test sorbents used in the experiment (a) vermiculite; (b) dolomite; (c) perlite; (d) agrobasalt.
Figure 1. Test sorbents used in the experiment (a) vermiculite; (b) dolomite; (c) perlite; (d) agrobasalt.
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Figure 2. Zea mays on the day of harvest. The series without contamination: (a) control; (b) with vermiculite; (c) dolomite; (d) perlite; (e) agrobasalt; and series (f) contaminated with gasoline; (g) vermiculite; (h) dolomite; (i) perlite; (j) agrobasalt.
Figure 2. Zea mays on the day of harvest. The series without contamination: (a) control; (b) with vermiculite; (c) dolomite; (d) perlite; (e) agrobasalt; and series (f) contaminated with gasoline; (g) vermiculite; (h) dolomite; (i) perlite; (j) agrobasalt.
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Figure 3. Methods for determining the energetic value of plants.
Figure 3. Methods for determining the energetic value of plants.
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Figure 4. Methods of chemical analysis of plants.
Figure 4. Methods of chemical analysis of plants.
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Figure 5. Indexes of the influence of gasoline (G) and sorbents on the yield of aboveground parts (Ya), roots (Yr), the ratio of yield of aboveground parts to plant roots (Ya/Yr) and the greenness index (SPAD). Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 5. Indexes of the influence of gasoline (G) and sorbents on the yield of aboveground parts (Ya), roots (Yr), the ratio of yield of aboveground parts to plant roots (Ya/Yr) and the greenness index (SPAD). Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Figure 6. Indexes of the influence of gasoline (G) and sorbents on the content of ash and elements determining the energy value of aboveground biomass of Zea mays. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 6. Indexes of the influence of gasoline (G) and sorbents on the content of ash and elements determining the energy value of aboveground biomass of Zea mays. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Figure 7. Indexes of the influence of gasoline (G) and sorbents on the heat of combustion (Q), calorific value (Hv), and amount of energy produced (Yep) from Zea mays biomass. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 7. Indexes of the influence of gasoline (G) and sorbents on the heat of combustion (Q), calorific value (Hv), and amount of energy produced (Yep) from Zea mays biomass. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Figure 8. Share of independent variables (η2) in determining dependent variables in Zea mays biomass, %. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 8. Share of independent variables (η2) in determining dependent variables in Zea mays biomass, %. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Figure 9. Pearson’s simple correlation coefficients. Significant at p = 0.05, n = 24. Red color—statistically significant, black color—statistically insignificant. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 9. Pearson’s simple correlation coefficients. Significant at p = 0.05, n = 24. Red color—statistically significant, black color—statistically insignificant. Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Figure 10. The interaction between the studied parameters using (PCA). Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
Figure 10. The interaction between the studied parameters using (PCA). Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section.
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Table 1. Zea mays biomass, SPAD (6th leaf phase).
Table 1. Zea mays biomass, SPAD (6th leaf phase).
ObjectsAboveground Parts
(Ya)
Roots
(Yr)
Ya/YrGreenness Index
(SPAD)
Grams of Dry Matter per Pot
Us74.145 a7.018 a10.56544.322 ab
V70.961 ab8.850 a8.01843.984 ab
D72.325 ab7.612 a9.50244.856 ab
P65.447 b7.429 a8.81042.322 b
A68.428 ab6.685 a10.23743.878 ab
G12.679 e1.114 b11.38445.372 ab
V_G26.448 cd1.749 b15.11945.256 ab
D_G30.099 c2.025 b14.86245.753 ab
P_G20.080 d1.874 b10.71344.278 ab
A_G32.946 c2.258 b14.58948.013 a
Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section. Homogeneous groups denoted with letters (a–e) were calculated separately for each part of the plant and greenness index.
Table 2. Ash content and elements determining the energy value of aboveground biomass of Zea mays (%).
Table 2. Ash content and elements determining the energy value of aboveground biomass of Zea mays (%).
Objects *Ash Nitrogen (N)Carbon (C)Hydrogen (H)Sulfur (S)Oxygen (O)
Us4.971 f2.044 g51.124 ab5.730 ab0.092 de36.039 b
V4.970 f1.940 h51.319 a5.788 a0.082 e35.901 b
D5.710 d2.683 e50.865 b5.538 cd0.098 d35.105 c
P5.097 f2.347 f49.163 c5.488 d0.101 d37.804 a
A5.328 e2.035 g49.212 c5.739 a0.083 e37.604 a
G9.636 b4.158 c49.244 c5.746 a0.215 b31.000 g
V_G10.594 a3.962 d47.998 d5.584 bcd0.206 bc31.657 f
D_G9.150 c4.615 a47.434 e5.459 d0.195 c33.146 e
P_G9.130 c4.316 b47.162 ef5.503 d0.247 a33.642 d
A_G9.547 b4.294 b47.030 f5.676 abc0.212 b33.240 de
* Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section. Homogeneous groups indicated by letters (a–h) were calculated separately for each parameter tested.
Table 3. Heat of combustion (Q), calorific value (Hv), and amount of energy obtained (Yep) from Zea mays biomass.
Table 3. Heat of combustion (Q), calorific value (Hv), and amount of energy obtained (Yep) from Zea mays biomass.
Objects *Heat of Combustion (Q) Heating Value (Hv)Energy yield of Plant Biomass (Yep), MJ pot−1
MJ kg−1 Air-Dry Matter Plants
Us18.710 f15.115 f1.121 b
V18.769 e15.163 e1.076 c
D19.250 a15.563 a1.126 a
P19.268 a15.578 a1.020 e
A19.080 b15.422 b1.055 d
G18.982 c15.340 c0.194 j
V_G18.820 d15.206 d0.402 h
D_G19.093 b15.432 b0.465 g
P_G18.979 c15.337 c0.308 i
A_G19.015 c15.368 c0.506 f
* Explanations of the abbreviations of the sorbents tested (objects) are given in the abbreviations section. Homogeneous groups denoted with letters (a–j) were calculated separately for Q, Hv, and Yep.
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Borowik, A.; Wyszkowska, J.; Zaborowska, M.; Kucharski, J. Energy Quality of Corn Biomass from Gasoline-Contaminated Soils Remediated with Sorbents. Energies 2024, 17, 5322. https://doi.org/10.3390/en17215322

AMA Style

Borowik A, Wyszkowska J, Zaborowska M, Kucharski J. Energy Quality of Corn Biomass from Gasoline-Contaminated Soils Remediated with Sorbents. Energies. 2024; 17(21):5322. https://doi.org/10.3390/en17215322

Chicago/Turabian Style

Borowik, Agata, Jadwiga Wyszkowska, Magdalena Zaborowska, and Jan Kucharski. 2024. "Energy Quality of Corn Biomass from Gasoline-Contaminated Soils Remediated with Sorbents" Energies 17, no. 21: 5322. https://doi.org/10.3390/en17215322

APA Style

Borowik, A., Wyszkowska, J., Zaborowska, M., & Kucharski, J. (2024). Energy Quality of Corn Biomass from Gasoline-Contaminated Soils Remediated with Sorbents. Energies, 17(21), 5322. https://doi.org/10.3390/en17215322

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