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Article

Bioremediation of Polluted Soil Sites with Crude Oil Hydrocarbons Using Carrot Peel Waste

by
Latifa Hamoudi-Belarbi
1,2,*,
Safia Hamoudi
3,
Khaled Belkacemi
3,†,
L’Hadi Nouri
2,
Leila Bendifallah
4 and
Mohamed Khodja
5
1
Department of Nature and Life Sciences, Faculty of Sciences, University of Algiers, 1 Benyoucef Benkhedda, 2 Street Didouche Mourad, Algiers 16000, Algeria
2
Laboratory of Food Technology, Faculty of Engineer Sciences, University of M’Hamed Bougara, Boumerdès 35000, Algeria
3
Department of Soil Sciences and Agri-Food Engineering, Centre in Green Chemistry and Catalysis (CGCC), Université Laval, Quebec, QC G1V 0A6, Canada
4
Laboratory of Soft Technology, Valorization, Physical-Chemistry of Biological Materials and Biodiversity, Department of Agronomy, Faculty of Sciences, University of M’Hamed Bougara, Boumerdès 35000, Algeria
5
Laboratries Division/ SONATRACH, Avenue 1st November, Boumerdès 35000, Algeria
*
Author to whom correspondence should be addressed.
†
The late professor Khaled Belkacemi passed away in the terrorist attack perpetrated at Quebec City on 29 January 2017.
Environments 2018, 5(11), 124; https://doi.org/10.3390/environments5110124
Submission received: 6 September 2018 / Revised: 14 November 2018 / Accepted: 15 November 2018 / Published: 17 November 2018
(This article belongs to the Special Issue Bioremediation of Contaminated Soils)
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Abstract

:
The biostimulation potentials of carrot peel waste and carob kibbles for bioremediation of crude petroleum-oil polluted soil were investigated. Temperature, pH, moisture, total petroleum hydrocarbon (TPH), and changes in microbial counts during 45 days were monitored when 4 mL of carrot peel waste or carob kibbles media were added to 200 g of crude oil polluted soil samples. Gas chromatography-flame ionization detection (GC-FID) was used to compare hydrocarbon present in the crude oil polluted soil and in pure fuel, composition of crude oil polluted soil was analyzed by X-ray diffraction (XRD), and the TPH was measured by distillation using distiller mud. The results showed that, at the end of experiments, the concentration of TPH decreased in crude oil polluted soil containing carrot peel waste with a percentage of 27 ± 1.90% followed by crude oil polluted soil containing carob kibbles (34 ± 1.80%) and in the unamended control soil (36 ± 1.27%), respectively. The log [Colony Forming Unit (CFU)/g] of total heterotrophic bacteria in the crude oil polluted soil increased from 10.46 ± 0.91 to 13.26 ± 0.84 for carrot peel waste, from 11.01 ± 0.56 to 11.99 ± 0.77 for carob kibbles and from 8.18 ± 0.39 to 8.84 ± 0.84 for control, respectively. Such results demonstrated that carrot peel could be used to enhance activities of the microbial hydrocarbon-degrading bacteria during bioremediation of crude petroleum-oil polluted soil.

1. Introduction

Crude oil is the most important source of energy worldwide; however, routine operations of extraction and drilling of this fossil energy resource cause serious environmental problems [1]. Crude oil contains a wide range of compounds that pose a significant risk for the environment and human health and have cytotoxic, mutagenic, and carcinogenic effects [2]. Reducing the petroleum hydrocarbon compounds in a polluted environment becomes a significant challenge for oil companies that are forced to conduct an adequate and effective treatment of these pollutant emissions. Thermal treatment, soil washing, soil vapor extraction, solidification, and stabilization are physical and chemical techniques used to treat petroleum hydrocarbon-polluted soil [3]. However, they are often expensive, ineffective, and rarely neutral [4].
Bioremediation of hydrocarbons in polluted soils is a promising treatment method [5,6]. Based on the principle of complete mineralization or transformation of petroleum products into less toxic forms by different groups of microorganisms [7], bioremediation is the most effective, non-invasive, the least expensive and eco-friendly technique [8,9,10]. Conservation of soil texture and characteristics are among the advantages of bioremediation. Besides, physical and chemical properties of the soil, such as aeration, pH, water-holding capacity, and ion exchange capacity can be improved after bioremediation [11].
This process occurring naturally can be accelerated by bio-stimulation. This strategy is based on stimulation of the catabolic activity of indigenous microorganisms by the addition of nutrient-rich organic and inorganic materials, supplying oxygen or other electron acceptors, and by maintaining suitable conditions of temperature, pH, and moisture [7,12,13]. In arid areas, where soils are poor in organic and mineral nutrient matters, and are usually subjected to extreme environmental conditions (high temperatures and irradiance) [14]; the rate of degradation of complex hydrocarbon compounds from crude oil polluted sites is usually limited by biodegrading microbiota [15].
Bio-stimulants with promising results, like carob kibbles, sugarcane bagasse, sugarcane molasses, wheat straw, banana skin, yam peel, saw dust, spent brewing grain, rice husk, and coconut shell have been used earlier [16,17,18,19].
Two important hypotheses have been proposed to elucidate the mechanisms involved in the enhanced removal of hydrocarbon petroleum products from soils using bio-stimulants [20]. The first one suggested that, nutrient matters, especially nitrogen and phosphorus, usually considered as the limiting factors for the bioremediation of contaminated soils [21], once provided by the bio-stimulants, enhance substantially the growth of hydrocarbon degrading bacteria [22,23,24,25,26].
The second hypothesis is based on the ability of bio-stimulants to release biosurfactants that increase the bioavailability of poorly soluble hydrocarbon petroleum compounds [27,28,29]. For instance, Yi and Crowley [27] found that plants produced fatty acids acted as biosurfactants significantly enhancing pyrene and benzo[a]pyrene degradation when added directly to polluted soil.
Furthermore, bioavailability is governed by the interactions between microorganisms and the environmental conditions (pH, temperature, etc.) as well as the physico-chemical interactions between polluting compounds and the soil matrix [30]. Therefore, bioavailability of polluting hydrocarbons to degrading bacteria can be related to soil mineral composition, which is usually assessed using X-ray diffraction analysis [26,31].
The aim of this work was to study the efficacy of two bio-stimulants, i.e., carrot peel waste and carob kibbles, to degrade crude oil polluted soil as a judicious alternative to expensive physical and chemical treatments.

2. Materials and Methods

2.1. Crude Oil Polluted Soil Origin

Crude oil polluted soil was collected at a disused oil-drilling quagmire in the Hassi Messaoud field (Algeria). Samples were collected at 0–50 cm depth using a stainless steel sampler, placed in appropriate containers thoroughly mixed therein.

2.2. Carrot Peel Waste Medium

Carrots, Daucus carota, were purchased from a local vegetable market then peeled. The peels were mixed and macerated at a ratio of 1 kg in 2.5 L of distilled water at 85 °C for 45 min with continuous stirring [32]. After filtration and decantation, the medium was autoclaved at 120 °C for 20 min and stored at 4 °C before its use as a bio-stimulating medium.

2.3. Carob Kibbles Medium

Dry pods of carob, Ceratonia siliqua, were obtained from locality of Ighil-Ali (Bejaïa, Algeria). Pods were cut and manually de-seeded. Carob kibbles were then pitted and macerated at a ratio of 1 kg in 2.5 L of distilled water at 85 °C for 45 min with continuous stirring [32]. The mash was filtered, decanted, autoclaved at 120 °C for 20 min, and stored at 4 °C before its use as a bio-stimulating medium.

2.4. Experimental Design

In order to evaluate the effectiveness of hydrocarbon degradation, 4 mL of carrot peel waste or carob kibbles media were added to 200 g of crude oil polluted soil samples, resulting in slurry mixtures placed in circular cells and mixed thoroughly. Experiments were also conducted on unamended control soil samples for the sake of comparison. A total of 6 cells were used in the study and each treatment was carried out in duplicate. Cells containing treatment materials or the control were run in the open air and mixed every 3 days to ensure homogenous distribution during 45 days of remediation tests.

2.5. Characterization of Carrot Peel Waste and Carob Kibbles

Total soluble solids (TSS) were determined by desiccation in the oven at 105 °C until a constant weight while pH was determined using pH meter (Accumet AE150 instrument; Fisher Scientific, Illkirch, France). Calcium, magnesium, phosphorus, nitrate and nitrite were determined by digital titrator. All measurements were performed in triplicate, and the mean was used for analyses.

2.6. Physico-Chemical Characterization of Crude Oil

2.6.1. X-ray Diffraction (XRD)

The soil samples were prepared for XRD measurement by orienting them in a glass slide following standard procedure. The slides were air dried and placed in a desiccators containing silica gel to prevent rehydration. X-ray powder diffraction of the prepared materials was carried out using a Philips diffractometer with nickel-filtered Cu Kα radiation of wavelength 1.5406 Å. Powder diffraction patterns were obtained between 10° and 80° with a scan speed of 5 degree/min. Data were interpreted by reference to X’Pert accompanying software program High Score Plus in conjunction with data from the ICDD (International Centre for Diffraction Data) Powder Diffraction File [33].

2.6.2. Gas Chromatographic (GC-FID) Analysis

The soil samples were extracted using methylene chloride solvent. Aliquot of extracts as well as pure fuel were analyzed using an Agilent 6890 Series II gas chromatograph equipped with a flame ionization detector and an on-column injector. Separation was achieved using a 25 m 0.32 mm internal diameter fused silica capillary column. The operating conditions were: Temperature program 40°–280 °C at 4 °C/min, injector temperature 280 °C, detector temperature 280 °C, and carrier gas: H2 (1 mL/min).

2.6.3. Physicochemical Parameters Measurements of Crude Oil Polluted Soil

The temperature and pH were determined using thermometer (MRC 201, France) and, pH meter (Accumet AE150 instrument; Fisher Scientific, Illkirch, France), respectively.
Total petroleum hydrocarbon (TPH) percentage of soil samples was measured by distillation using Fann distiller according to API recommendations [34]. This method is used to determine the percentage of water/oil in the crude oil. 20 mL of each soil sample is placed in a distiller, then heated up to 800 °C. The vapors of water and oil are then condensed back into liquid form and collected (distillate). After about 30 to 60 min of decantation, the volumes of water and oil are read directly. After distillation, the remaining mass of mud is weighed. The percentages of water and oil are directly determined. Two replications were conducted for all measurements. The residual moisture of crude oil polluted soil samples was determined (in duplicate) by the difference in weight before and after drying in a vacuum oven at 105 °C for 3 h in the presence of P2O5.

2.7. Microbiological Analysis

Two replicate samples from each crude oil polluted soil amended with carrot peel waste, carob kibbles, and unamended control soil were withdrawn at the end of second, fourth, and sixth week of the study for the enumeration of total aerobic heterotrophic bacteria. Aliquots of serially diluted samples (0.1 mL) were plated on nutrient agar medium (Oxoid). All inoculated plates were incubated aerobically at room temperature and counted after 48 h.

2.8. Statistical Analysis

Data were statistically analyzed by Data Analysis Tool pack of Microsoft Office Excel 2007 (Microsoft, New York, NY, USA). Excel was used for data management and exploratory data analyses. Excel was also used for drawing of graphs and bar charts regarding temperatures, pH, TPH, residual moisture, and microbiological analysis of crude oil polluted soil amended with carrot peel waste, carob kibbles, and unamended control soil during 45 days of treatments. p < 0.05 was used to judge statistical significance.

3. Results and Discussion

3.1. Properties of Carrot Peel Waste and Carob Kibbles

Table 1 shows the chemical composition, total soluble solids (TSS), moisture content, and pH of carrot peel waste and carob kibbles. Calcium, magnesium, and phosphorus, are the major elemental components of all carrot peel waste and carob kibbles; while nitrate and nitrite are in trace. Magnesium is at lower concentrations in all carrot peel waste and carob kibbles (7.29 ± 0.30 and 6.28 ± 0.20 respectively). However, phosphorus is at higher concentration in carrot peel compared to carob kibbles (25 ± 1.20 and 7.1 ± 0.20 respectively). Cutright [35] found that phosphorus increased the degradation of a poly aliphatic hydrocarbon mixture by aerobic bacteria. Besides, this important nutrient together with nitrogen, stimulated microbial growth and led to synthesize enzymes required to degrade petroleum hydrocarbon [36]. Concentration of nitrogen in the root of carrot (1400 ppm) from data previously compiled by the US Department of Agriculture (USDA) (http://www.ars-grin.gov/duke/) [37] demonstrated the importance of nitrogen for cellular protein and cell wall configuration of microorganisms, while phosphorus is essential for synthesis of nucleic acids, cell membrane, and ATP formation [38]. While in an arid area where soils have low contents of organic matter and low numbers of microorganisms, stimulation of degrading bacteria by phosphorus present in carrot peel waste contributed to initiate remediation of crude oil polluted soil.
The total soluble solids (TSS) of carrot peel waste and carob kibbles were 19.24 ± 2.04% and 30.45 ± 2.40%, respectively. These values are due to the degree of tissue breakdown, releasing more components that contribute to soluble solids [39]. pH values of carrot peel waste and carob kibbles explain the ability of microorganisms to growth in these media that tolerate very wide ranges from 2.4 to 8.6.

3.2. Mineral Composition of Crude Oil Polluted Soil

The X-ray diffraction (XRD) results for minerals present in crude oil polluted soil are shown in the Table 2. Results indicate that the main constituents of crude oil polluted soil fractions are, for non-clay minerals, quartz, barite, albite, anhydrite, and calcite. Illite was the major clay component. According to the XRD mineralogical study conducted by Khodja [40], the unpolluted sandy soil withdrawn from sites nearby a petroleum oil field showed a predominance of quartz, microcline and gypsum. These results indicate that the other minerals present in crude oil polluted soil are attributed to the materials brought to the soil surface by the drilling fluids used during the drilling operations.
The analysis of the organic fraction obtained after distillation of the crude oil polluted soil proved that oil contains fuel fractions (Figure 1A,B) with presence of hydrocarbons ranging from C10 to C20. These results are in large agreement with those found earlier by Marchal et al. [41]. Besides, hydrocarbons with carbon number varying from 12 to 25 were previously reported [42].

3.3. Physicochemical Properties of Amended and Unamended Samples

Physicochemical parameters of samples were analyzed for one week intervals during the study period. pH value of all amended soils with carrot peel waste, carob kibbles and unamended control soil was basic at the beginning of study (8.5 ± 0.26) (Figure 2A). However, the pH of the amended samples decreased gradually then increased to reach, at the end of study, 7.7 ± 0.24 for carrot peel waste amended soil and 7.61 ± 0.30 for carob kibbles amended soil, respectively. These results are in agreement with those found by Morgan and Atlas [43] who demonstrated that the optimum pH for hydrocarbon degradation in soil is between 6.5 and 8. Besides, Dibble and Bartha [44] concluded that pH 7.7–7.8 was optimal for hydrocarbons degradation and suggested that lower values of pH may result in partial inhibition of degradation.
Moisture content of crude oil polluted soil and amended with carrot peel waste ranged between 51.0 ± 2.12% and 57.0 ± 1.41% at the end of the treatment while that of crude oil polluted soil amended with carob ranged from 51.0 ± 2.12% and 54.0 ± 2.82% at the end of treatment, respectively (Figure 2B). However, the moisture content of control decreased from 51.0 ± 2.12% to 36.0 ± 4.24% at the end of treatment. Bacterial catabolism results in the production of energy and water. Besides, moisture is a limiting factor during biodegradation [45].
Figure 2C shows the evolution of temperature as a function of time throughout the study. According to Atlas [46], the effect of temperature on the physical nature and chemical composition of the oil, rate of hydrocarbon metabolism by microorganisms and composition of the microbial community, influences petroleum biodegradation. At the beginning of the study, the temperature of crude oil unamended and amended soil was approximately 21.8 °C ± 0.28. An increase in soil temperature was obtained for all samples after 15 days, followed by gradual decreasing then stabilization at 21.3 °C ± 0.42 for unamended soil control at the end of the study, while temperature values of amended samples continue their progression. These results may be due to the intensity of the metabolic activity of biodegrading microbiota present in carrot peel waste and carob kibbles amended crude oil soil. During microbial activities, big and complexes molecules are fragmented with the liberation of energy; some of this energy is captured and used for anabolism; the rest is released as heat [47]. Higher temperature increased the rate of hydrocarbon metabolism [48]. Moreover, earlier studies demonstrated that, in the laboratory, hydrocarbon degradation occurred within temperatures ranging from 4 to 30 °C [49,50].

3.4. Crude Oil Polluted Soil Degradation

In this study, distillation was used to determine total petroleum hydrocarbon (TPH) in the crude oil polluted samples (Figure 3). At the end of the experiment (45 days), the crude oil in the amended samples was attenuated. With initial concentration of TPH about 38 ± 1.4%, corresponding to 3.60 g/kg at the beginning of the study for all samples, a difference in the concentration of TPH obtained at different time intervals in the carrot peel waste and carob amended samples with percentages of 31 ± 0.67% and 37 ± 1.37% after 15 days, 29.5 ± 0.70% and 35 ± 1.51%, respectively at the end of the 30th day were shown. For the unamended control soil, reduction in the amount of TPH was gradual at the end of the 15th day, and the 30th day of study, with percentages of 37.6 ± 1.20% and 36 ± 0.52%, respectively. By the end of the study, the decrease in the amount of TPH in carrot peel waste amended, carob kibbles amended and unamended samples were 27 ± 1.90%, 34 ± 1.80% and 36 ± 1.27%, respectively. The significant decrease in the content of TPH in the carrot peel waste amended sample compared to the carob kibbles amended sample, and unamended sample at different time intervals of study can be attributed to two factors [27,36,37,51]. First, the additional nutrient nitrogen and phosphorus contained in the carrot peel waste stimulated microbial growth and led to synthesized enzymes required to degrade petroleum hydrocarbon compounds [36]. On the other hand, carrots are known to release linoleic acid, which can increase the bioavailability of poorly soluble hydrocarbon petroleum compounds, as previously reported [27,28,29,51].
Several hypotheses have been proposed to explain the mode of action of linoleic acid [51]. During degradation, selective enrichment of hydrocarbons biodegrading bacteria would occur in the presence of linoleic acid. A second possibility is based on the ability of linoleic acid, by acting as a biosurfactant, to increase bioavailability of hydrocarbons to biodegrading bacteria [51]. The last possibility stipulated that linoleic acid increased the attachment of bacteria to the hydrophobic sites that adsorb hydrocarbons by coating the soil particles. High concentration of linoleic acid in roots of carrot compared to that of husk carob fruits (67% and 28.68%, respectively), found in compiled data by the USDA and available on the Internet (http://www.ars-grin.gov/duke) [37] confirmed the effectiveness of biodegradation by carrot.

3.5. Microbial Counts

The log [Colony Forming Unit (CFU)/g] of crude petroleum oil polluted soil in the presence of carrot peel waste as organic amendment ranged between 10.46 ± 0.91 at the end of the second week and 13.06 ± 0.84 at the end of the sixth week of treatment, while that of crude petroleum oil polluted soil amended with carob ranged from 11.01 ± 0.56 at the second week and 11.99 ± 0.77 at the end of the sixth week of treatment, respectively (Figure 4). However, the log CFU/g of control crude petroleum oil polluted unamended soil was lower than those amended with carrot peel waste and carob and ranged between 8.18 ± 0.39 at the end of the second week and 8.84 ± 0.84 at the end of the sixth week of treatment, respectively. Crude oil polluted soil amended with organic matter may stimulate growth of the indigenous oil degrading microbiota in it [18]. Similar observations have been reported using organic amendment [52]. By the end of the study, population of indigenous oil degrading microbiota increased rapidly, which corresponds to high availability of hydrocarbons during these periods [53]. The main reason for the occurrence of higher log CFU of bacteria when carrot peel waste is used as organic amendment for decontamination of crude oil polluted soil in comparison to carob kibbles amended crude oil polluted soil and unamended soil can be due, as explained earlier, to the presence of considerable quantities of P in carrot peel waste (25.10 ± 1.20 mg/L), which is a necessary nutrient for bacterial biodegradative activities [54]. In addition, production of linoleic acid biosurfactant by carrot increases the solubility and availability of hydrocarbons to biodegrading bacteria [54] and contributes to the biodegradation of petroleum hydrocarbons. Desert soils have been previously shown to be nutrients-limited [55].

4. Conclusions

In conclusion, this study demonstrated that bio-stimulation of biodegrading crude oil microbiota with carrot peel waste enhanced degradation of crude oil under laboratory conditions. The TPH degradation in the crude oil contaminated soil was enhanced by bio-stimulation with nutrients present in the carrot peel waste in comparison to carob kibbles and control. Degradation of TPH increased after 45 days of incubation during bioremediation. The biodegrading crude oil microbiota in the crude oil polluted soil was positively related to TPH degradation efficiency during bio-remediation. Carrot peel waste, containing high amounts of phosphorus, enhanced bioremediation of crude oil polluted soil by increasing microbial activities of biodegrading indigenous microbiota. Also, linoleic acid produced by carrot peel waste, increased the solubility and availability of hydrocarbons to biodegrading bacteria.

Author Contributions

Conceptualization, L.H.-B., S.H., K.B., L.N. and L.B.; Methodology, L.H.-B. and M.K.; Writing—original draft, L.H.-B.; Writing—review & editing, S.H.

Funding

This research received funding from the Algerian Ministry of High Education and Scientific Research.

Acknowledgments

The authors gratefully acknowledge the Algerian Ministry of High Education and Scientific Research for financial support.

Conflicts of Interest

The authors declare no conflict of interest.

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Environments 05 00124 g001a 550Environments 05 00124 g001b 550
Figure 1. A conventional Gas Chromatography (GC) analysis of pure fuel (A) and crude oil polluted soil (B).
Figure 1. A conventional Gas Chromatography (GC) analysis of pure fuel (A) and crude oil polluted soil (B).
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Figure 2. Evolution of pH (A), moisture (B), and temperature (C) during 45 days of treatment. Treatment with carrot peel waste (♦); Treatment with carob kibbles (■); and Control without treatment (▲). Error bars represent the standard error of replicates.
Figure 2. Evolution of pH (A), moisture (B), and temperature (C) during 45 days of treatment. Treatment with carrot peel waste (♦); Treatment with carob kibbles (■); and Control without treatment (▲). Error bars represent the standard error of replicates.
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Environments 05 00124 g003 550
Figure 3. The rate of total petroleum hydrocarbon (TPH) during 45 days of treatment. Treatment with carrot peel waste (♦); Treatment with carob (■); and Control without treatment (▲). Error bars represent the standard error of replicates.
Figure 3. The rate of total petroleum hydrocarbon (TPH) during 45 days of treatment. Treatment with carrot peel waste (♦); Treatment with carob (■); and Control without treatment (▲). Error bars represent the standard error of replicates.
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Environments 05 00124 g004 550
Figure 4. Evolution of microbial count during 6 weeks (45 days) of treatment. Treatment with carrot peel waste (■); Treatment with carob (■); and Control without treatment (■). Error bars represent the standard error of replicates. CFU: Colony Forming Unit.
Figure 4. Evolution of microbial count during 6 weeks (45 days) of treatment. Treatment with carrot peel waste (■); Treatment with carob (■); and Control without treatment (■). Error bars represent the standard error of replicates. CFU: Colony Forming Unit.
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Table
Table 1. Mineral contents and physico-chemical properties of carrot peel waste and carob kibbles media.
Table 1. Mineral contents and physico-chemical properties of carrot peel waste and carob kibbles media.
Elements (mg/L)Carrot Peel WasteCarob Kibbles
Calcium32.06 ± 2.01 a26.08 ± 2.30 a
Magnesium7.29 ± 0.306.28 ± 0.20
Phosphorus25.10 ± 1.207.1 ± 0.20
Nitrate3.01 ± 0.201.02 ± 0.10 a
Nitrite0.5 ± 0.020.4 ± 0.01
Parameters
Total solid extract (%)19.24 ± 2.04 a30.45 ± 2.40 a
Moisture (%)80.76 ± 4.3069.55 ± 3.40
pH5.31 ± 0.955.32 ± 0.90
a Mean and standard error of three repetitions.
Table
Table 2. X-ray diffraction analysis results for minerals present in crude oil polluted soil.
Table 2. X-ray diffraction analysis results for minerals present in crude oil polluted soil.
MineralsCrude Oil Polluted SoilUnpolluted Soil [40]Chemical Formula
Non-clay mineralsBarite BaSO4
QuartzQuartzSiO2
Calcite-CaCO3
Dolomite-CaMg(CO3)2
Anhydrite-Ca(SO4)
Albite-NaAlSi3O8
Ankerite-Ca (Fe, Mg, Mn)(CO3)2
Barium chloride hydrate-BaCl2·2H2O
-Microcline, orderedKAlSi3O8
-GypsumCaSO4·2H2O
Clay in low concentrationsIllite, trioctahedral-K0.5 (Al, Fe, Mg)3·(Si, Al)4 O10 (OH)2
(-) None.

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Hamoudi-Belarbi, L.; Hamoudi, S.; Belkacemi, K.; Nouri, L.; Bendifallah, L.; Khodja, M. Bioremediation of Polluted Soil Sites with Crude Oil Hydrocarbons Using Carrot Peel Waste. Environments 2018, 5, 124. https://doi.org/10.3390/environments5110124

AMA Style

Hamoudi-Belarbi L, Hamoudi S, Belkacemi K, Nouri L, Bendifallah L, Khodja M. Bioremediation of Polluted Soil Sites with Crude Oil Hydrocarbons Using Carrot Peel Waste. Environments. 2018; 5(11):124. https://doi.org/10.3390/environments5110124

Chicago/Turabian Style

Hamoudi-Belarbi, Latifa, Safia Hamoudi, Khaled Belkacemi, L’Hadi Nouri, Leila Bendifallah, and Mohamed Khodja. 2018. "Bioremediation of Polluted Soil Sites with Crude Oil Hydrocarbons Using Carrot Peel Waste" Environments 5, no. 11: 124. https://doi.org/10.3390/environments5110124

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