Phosphorus Management in Slovakia—A Case Study
Abstract
:1. Introduction
2. Materials and Methods
- Factors identification.
- Formation of matrix to compare the importance of factors.
- Construction of evaluation vector by evaluating each factor.
- Evaluation of the indicators:Si = ΠSij; j = 1, 2, ..., f,f–number of factors,Sij–single factor,
- Comparation of the indicatorsRi = (Si)1/f
3. Results
- traditionally obtained by mining phosphate rock,
- recovery and recycling,
- alternative.
3.1. Processing of Phosphate Rock
3.2. P Recovery and Recycling
- surface water;
- untreated wastewater;
- treated wastewater;
- sewage sludge;
- sewage sludge ash;
- slaughter waste;
- manure;
- urine;
- steelmaking slag.
- Chemical precipitation of wastewater, that is based on the addition of iron or aluminum chlorides or sulphates to wastewater resulting into insoluble phosphate salts removable by sedimentation; about 90% of P can be recovered from wastewater;
- Enhanced biological removal from wastewater, that is based on removal of P by microorganisms from wastewater; more than 90% of P can be recovered from wastewater;
- Struvite formation from wastewater by adding soluble magnesium chloride, increasing pH to 8–9 by sodium hydroxide, thus forming struvite crystals; 40% of wastewater can be treated this way with a 90% efficiency;
- Calcium phosphate formation from wastewater by adding calcium hydroxide and increasing pH to 9 thus precipitating calcium phosphate;
- Iron phosphate formation from wastewater in the form of vivianite [iron(II) phosphate] by anaerobic digestion under neutral pH, vivianite can be separated from sludgy magnetically;
- Sewage sledge treatment at wastewater treatment plants, there is a number of methods for direct recovery, by wet-chemical or thermochemical treatment; about 90% of P can be recovered;
- Sewage sludge ash, that is rich in P, about 9–13.1%, catches about 87% of P in influent wastewater, P can be recovered by wet-chemical or thermochemical treatment; about 30–40% of P can be recovered.
- Animal-delivered waste streams—especially livestock manure that can be processed by anaerobic digestion, followed by thermal treatment and processed as biochar or ash, or it that can be dewatered, the final liquid can be precipitated for calcium phosphate or struvite; may contain a maximum of 30% P;
- Category 1 animal by-products and derived products (meat and bone meal), when incinerated to valorize energy content and hygienize, it mostly comprises Ca5(PO4)3OH and Ca3(PO4)2, contains 15–19% of P;
- Steelmaking slag, there is a number of methods for P recovery, e.g., capillary action separation, carbothermic reduction, magnetic separation, aqueous dissolution, reductive melting, etc.; it contains 0.3–1.7% of P.
3.3. Current State in Slovakia
3.3.1. P Export and Import
3.3.2. Mining
3.3.3. Surface Water and Sediments
3.3.4. Wastewater Production and Treatment
3.3.5. Sewage Sludge and Sewage Sludge Ash
3.3.6. Animal and Slaughter Waste
3.3.7. Steelmaking Slag
3.3.8. Available P Sources
3.4. SWOT Analysis
4. Discussion
5. Conclusions
- no P deposit mined;
- a low number of potential P deposits;
- no P recovered from available sources;
- reduction of cattle breeding and manure and urine production;
- a lack of governmental support;
- instability in steel production;
- significant dependence on P import.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Value | Explanation |
---|---|
1 | Equivalence of the factors i and j |
3 | Slight preference of factor i over j |
5 | Strong preference of factor i over j |
7 | High preference of factor i over j |
9 | Absolute preference of factor i over j |
Points | Criteria |
---|---|
1 | fits significantly below average |
2 | fits below average |
3 | fits at an average |
4 | fits above average |
5 | fits significantly above average |
Year | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
---|---|---|---|---|---|---|---|---|---|---|
Quantity [kg] | 170 | 100 | 237 | 43,447.5 | 212 | 2925 | 1353 | 1312 | 13,911 | 11 |
Trade value [1000USD] | 4.73 | 2.69 | 6.12 | 294.44 | 6.33 | 37.33 | 18.3 | 19.12 | 34.57 | 0.92 |
Year | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
---|---|---|---|---|---|---|---|---|---|---|
Quantity [kg] | 65,212.50 | 0 | 0 | 3780 | 0 | 0 | 0 | 0 | 0 | 0 |
Trade value [1000USD] | 175.64 | 0 | 0 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 |
River | Station | 1961–2000 | 1961–2010 | 2001–2009 | 2001–2010 |
---|---|---|---|---|---|
Morava | Moravský Ján | 106 | 106 | 99 | 106 |
Dunaj | Bratislava | 2061 | 2064 | 2074 | 2076 |
Váh | Šaľa | 141 | 142 | 135 | 144 |
Nitra | Nitrianska Streda | 14.6 | 14.4 | 12.4 | 13.6 |
Hron | Brehy | 45.9 | 45.1 | 37.5 | 42 |
Ipeľ | Holiša | 2.88 | 2.84 | 2.15 | 2.68 |
Slaná | Lenartovce | 13.8 | 13.6 | 11 | 12.9 |
Hornád | Ždaňa | 28.4 | 29.2 | 28.3 | 32.6 |
Bodva | Nižný Medzev | 0.76 | 0.76 | 0.61 | 0.76 |
Bodrog | Streda nad Bodrogom | 111 | 112 | 111 | 118 |
Poprad | Chmelnica | 14.8 | 15.1 | 15.6 | 16.6 |
Source | Estimated Amount of Source [t.year−1] | Estimated Amount of Available P Compounds [t.year−1] |
---|---|---|
surface water | - | 14,933 |
treated wastewater | - | 285 |
sewage sludge | 54,583 | 49,125 |
sewage sludge ash | 0 | 0 |
urine | 1,446,019 | 433,806 |
manure | 4,065,329 | 1,626,132 |
slaughter waste | 2400 | 456 |
steelmaking slag | 3,053,904 | 4214 |
Factor/Interaction | S1 | S2 | S3 | S4 | S5 | Si | Ri | αi |
---|---|---|---|---|---|---|---|---|
S1 | 1 | 1/5 | 1/3 | 1/5 | 1/3 | 0.00 | 0.34 | 0.05 |
S2 | 5 | 1 | 3 | 3 | 1/3 | 15.00 | 1.72 | 0.27 |
S3 | 3 | 1/3 | 1 | 1/5 | 1/5 | 0.04 | 0.53 | 0.08 |
S4 | 5 | 1/3 | 3 | 1 | 1/3 | 1.67 | 1.11 | 0.17 |
S5 | 3 | 3 | 5 | 3 | 1 | 135.00 | 2.67 | 0.42 |
SUM | 6.36 | 1.00 |
Factor/Interaction | W1 | W2 | W3 | W4 | W5 | W6 | Si | Ri | αi |
---|---|---|---|---|---|---|---|---|---|
W1 | 1 | 7 | 5 | 1/3 | 5 | 3 | 175.00 | 2.37 | 0.33 |
W2 | 1/7 | 1 | 3 | 3 | 5 | 5 | 32.14 | 1.78 | 0.25 |
W3 | 1/5 | 1/3 | 1 | 5 | 3 | 5 | 5.00 | 1.31 | 0.18 |
W4 | 3 | 1/3 | 1/5 | 1 | 1/7 | 1/5 | 0.01 | 0.42 | 0.06 |
W5 | 1/5 | 1/5 | 1/3 | 7 | 1 | 3 | 0.28 | 0.81 | 0.11 |
W6 | 1/3 | 1/5 | 1/5 | 5 | 1/3 | 1 | 0.02 | 0.53 | 0.07 |
SUM | 7.22 | 1.00 |
Factor/Interaction | O1 | O2 | O3 | O4 | O5 | O6 | Si | Ri | αi |
---|---|---|---|---|---|---|---|---|---|
O1 | 1 | 5 | 5 | 7 | 9 | 7 | 11025.00 | 4.72 | 0.52 |
O2 | 1/5 | 1 | 3 | 5 | 3 | 3 | 27.00 | 1.73 | 0.19 |
O3 | 1/5 | 1/3 | 1 | 3 | 5 | 3 | 3.00 | 1.20 | 0.13 |
O4 | 1/7 | 1/5 | 1/3 | 1 | 1/3 | 1/3 | 0.00 | 0.32 | 0.03 |
O5 | 1/9 | 1/3 | 1/5 | 3 | 1 | 1/3 | 0.01 | 0.44 | 0.05 |
O6 | 1/7 | 1/3 | 1/3 | 3 | 3 | 1 | 0.14 | 0.72 | 0.08 |
SUM | 9.13 | 1.00 |
Factor/Interaction | T1 | T2 | T3 | T4 | T5 | T6 | Si | Ri | αi |
---|---|---|---|---|---|---|---|---|---|
T1 | 1 | 7 | 5 | 5 | 7 | 5 | 6125.00 | 4.28 | 0.49 |
T2 | 1/7 | 1 | 1/5 | 1/5 | 1/3 | 1/5 | 0.00 | 0.27 | 0.03 |
T3 | 1/5 | 5 | 1 | 1/3 | 1/5 | 1/3 | 0.02 | 0.53 | 0.06 |
T4 | 1/5 | 5 | 3 | 1 | 1/3 | 1/3 | 0.33 | 0.83 | 0.10 |
T5 | 1/7 | 3 | 5 | 3 | 1 | 3 | 19.29 | 1.64 | 0.19 |
T6 | 1/5 | 5 | 3 | 3 | 1/3 | 1 | 3.00 | 1.20 | 0.14 |
SUM | 8.75 | 1.00 |
Strengths | Weight | Points | Sum | Weaknesses | Weight | Points | Sum |
---|---|---|---|---|---|---|---|
importers portfolio | 0.05 | 5 | 0.27 | the absence of P deposits | 0.33 | 5 | 1.64 |
favorable estimated potential of available P compounds from manure | 0.27 | 3 | 0.81 | technological complexity of P recovery from sources | 0.25 | 4 | 0.99 |
production of steelmaking slag as a source of Ps | 0.08 | 4 | 0.33 | declining trends in cattle breeding and the amount of manure and urine | 0.18 | 3 | 0.54 |
favorable estimated potential of available P compounds from urine | 0.17 | 3 | 0.52 | the absence of the P recovery from sewage sludge ash | 0.06 | 5 | 0.29 |
multiple sources for P recovery | 0.42 | 4 | 1.68 | low estimated potential of available P compounds from sewage sludge | 0.11 | 3 | 0.34 |
low estimated potential of available P compounds from steelmaking slag | 0.07 | 4 | 0.29 | ||||
SUM | 3.61 | SUM | 4.09 | ||||
Opportunities | Weight | Points | Sum | Threats | Weight | Points | Sum |
the extraction of Gočaltovo P deposit | 0.52 | 5 | 2.58 | lack of governmental support | 0.49 | 5 | 2.44 |
P recovery from manure | 0.19 | 3 | 0.57 | instability of steel production | 0.03 | 4 | 0.12 |
P recovery from urine | 0.13 | 3 | 0.39 | the reduction of manure production due to the reduction of cattle breeding | 0.06 | 3 | 0.18 |
P recovery from river sediments | 0.03 | 3 | 0.10 | the reduction of slaughter waste production due to the reduction of animal waste production | 0.10 | 3 | 0.29 |
P recovery from surface water | 0.05 | 2 | 0.10 | significant dependence on P import | 0.19 | 4 | 0.75 |
P recovery from slaughter waste | 0.08 | 3 | 0.24 | low number of potential P deposits | 0.14 | 4 | 0.55 |
SUM | 3.98 | SUM | 4.33 |
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Bakalár, T.; Pavolová, H.; Šimková, Z.; Bednárová, L. Phosphorus Management in Slovakia—A Case Study. Sustainability 2022, 14, 10374. https://doi.org/10.3390/su141610374
Bakalár T, Pavolová H, Šimková Z, Bednárová L. Phosphorus Management in Slovakia—A Case Study. Sustainability. 2022; 14(16):10374. https://doi.org/10.3390/su141610374
Chicago/Turabian StyleBakalár, Tomáš, Henrieta Pavolová, Zuzana Šimková, and Lucia Bednárová. 2022. "Phosphorus Management in Slovakia—A Case Study" Sustainability 14, no. 16: 10374. https://doi.org/10.3390/su141610374