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Nutrient recovery from anaerobically digested chicken slurry via struvite: Performance optimization and interactions with heavy metals and pathogens

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Title: Nutrient recovery from anaerobically digested chicken slurry via struvite: Performance optimization and interactions with heavy metals and pathogens
Authors: Atif Muhmood, Zeeshan Ajmal, Jiaxin Lu, Renjie Dong, Shubiao Wu, Hongzhen Luo
Source: Muhmood, A, Wu, S, Lu, J, Ajmal, Z, Luo, H & Dong, R 2018, 'Nutrient recovery from anaerobically digested chicken slurry via struvite : Performance optimization and interactions with heavy metals and pathogens', Science of the Total Environment, vol. 635. https://doi.org/10.1016/j.scitotenv.2018.04.129
Publisher Information: Elsevier BV, 2018.
Publication Year: 2018
Subject Terms: China, Sewage/analysis, Coliforms, Struvite, LANDFILL LEACHATE, SWINE WASTE-WATER, 0211 other engineering and technologies, Phosphate, 02 engineering and technology, 01 natural sciences, Metals, Heavy/chemistry, SOURCE-SEPARATED URINE, Enterobacteriaceae, Metals, Heavy, Escherichia coli, Animals, Chemical Precipitation, Anaerobiosis, SYNTHETIC WASTEWATERS, 0105 earth and related environmental sciences, MAGNESIUM AMMONIUM PHOSPHATE, 2. Zero hunger, PHOSPHORUS RECOVERY, Sewage, FLUIDIZED-BED REACTOR, 3 KINDS, 6. Clean water, Enterobacteriaceae/metabolism, Struvite/analysis, Heavy metal, TREATMENT SYSTEMS, PRECIPITATION, Escherichia coli/metabolism, Chickens, Ammonium
Description: The aim of this study was to assess the potential of struvite precipitation to recover nutrients from anaerobically-processed poultry slurry and struvite's interactions with heavy metals (Zn, Cu, Pb, Cr, and Ni) and pathogens (total coliforms and Escherichia coli). The impacts of pH, Mg, N, and P molar proportion, reaction time, and mixing rate and duration were explored to determine the optimal conditions for nutrient recovery through struvite precipitation. A pH range of 9.5 to 10.5, was ideal for P and N removal and recovery, with a molar ratio of 1:1:1 for Mg:N:P. A mixing rate of 150rpm for 10min could allow nutrient recovery with little loss (3.32%) of NH₃ through volatilization, and also achieve an optimal struvite crystal size (50-60μm). The results of X-ray diffractometry and scanning electron microscopy confirmed that the precipitates generated at pH9 and 10 were orthorhombic struvite. Moreover, along with the recovery of nutrients, 40, 45, 66, 30, and 20% of Zn, Cu, Pb, Cr, and Ni, respectively, and 70% total coliforms and E. coli were removed by struvite precipitation from poultry slurry. This was observed despite that the levels of contaminants (heavy metals) detected in struvite were well below the permissible limits and free of pathogens. Consequently, it was inferred that the struvite quality was reasonable by virtue of its heavy metal and pathogen content, and therefore appropriate for application in the field. Similarly, struvite precipitation has multiple benefits as it can effectively recover nutrients as well as reducing pathogenic populations.
Document Type: Article
Language: English
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2018.04.129
Access URL: https://pubmed.ncbi.nlm.nih.gov/29656055
https://www.ncbi.nlm.nih.gov/pubmed/29656055
https://www.sciencedirect.com/science/article/pii/S0048969718312944
http://ui.adsabs.harvard.edu/abs/2018ScTEn.635....1M/abstract
http://europepmc.org/abstract/MED/29656055
http://www.scopus.com/inward/record.url?scp=85045275811&partnerID=8YFLogxK
https://doi.org/10.1016/j.scitotenv.2018.04.129
https://pure.au.dk/portal/en/publications/64f83cd3-aec3-4834-9e75-a3a783396fd3
Rights: Elsevier TDM
Accession Number: edsair.doi.dedup.....4e30efe458d13d0fb6b88f723f6f662d
Database: OpenAIRE
Description
Abstract:The aim of this study was to assess the potential of struvite precipitation to recover nutrients from anaerobically-processed poultry slurry and struvite's interactions with heavy metals (Zn, Cu, Pb, Cr, and Ni) and pathogens (total coliforms and Escherichia coli). The impacts of pH, Mg, N, and P molar proportion, reaction time, and mixing rate and duration were explored to determine the optimal conditions for nutrient recovery through struvite precipitation. A pH range of 9.5 to 10.5, was ideal for P and N removal and recovery, with a molar ratio of 1:1:1 for Mg:N:P. A mixing rate of 150rpm for 10min could allow nutrient recovery with little loss (3.32%) of NH₃ through volatilization, and also achieve an optimal struvite crystal size (50-60μm). The results of X-ray diffractometry and scanning electron microscopy confirmed that the precipitates generated at pH9 and 10 were orthorhombic struvite. Moreover, along with the recovery of nutrients, 40, 45, 66, 30, and 20% of Zn, Cu, Pb, Cr, and Ni, respectively, and 70% total coliforms and E. coli were removed by struvite precipitation from poultry slurry. This was observed despite that the levels of contaminants (heavy metals) detected in struvite were well below the permissible limits and free of pathogens. Consequently, it was inferred that the struvite quality was reasonable by virtue of its heavy metal and pathogen content, and therefore appropriate for application in the field. Similarly, struvite precipitation has multiple benefits as it can effectively recover nutrients as well as reducing pathogenic populations.
ISSN:00489697
DOI:10.1016/j.scitotenv.2018.04.129