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Integrated application effects of biochar and plant residue on ammonia loss, heavy metal immobilization, and estrogen dissipation during the composting of poultry manure

Integrated application effects of biochar and plant residue on ammonia loss, heavy metal immobilization, and estrogen dissipation during the composting of poultry manure

Waste Management 131: 117-125

PMID: 34120077

DOI: 10.1016/j.wasman.2021.05.037

Inadequate handling of poultry manure can cause significant releases of NH3, heavy metals, and estrogen, thereby impairing environmental quality. This study was a composting experiment involving the combination of poultry manure with plant residues (corn stalks, mushroom residues, and vegetable straw), as well as with either wheat stalk biochar (WB) or rice husk biochar (RB). The integrated effects of plant residues and biochar on NH3 loss, heavy metal (Cu, Zn, As, and Cd) stabilization, and 17β-estradiol (E2) dissipation were investigated during composting. The poultry manure co-composted with corn straw and mushroom residue showed the highest potential for E2 degradation. Biochar enhanced E2 dissipation and decreased estrogenic activity in all treatments, with RB showing a stronger effect than WB. Both biochars decreased microbial diversity and increased bacterial groups related to E2 and organic matter degradation·NH3 emission was reduced by 50-82% with 15% WB and 86-97% with 15% RB. The extractable fraction of As was reduced by 0-53% with WB and 50-84% with RB, while that of Cd was reduced by 5-28% for WB and 25-41% for RB in poultry manure compost. However, biochar showed little effect on Cu and Zn. Biochar appears to have a promotional effect and enhances the microbial degradation of E2. Specifically, the integration of corn stalks, mushroom residues, and RB in poultry manure compost had a positive effect by preventing nitrogen loss while reducing the bioavailability of heavy metals and hormones.

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Accession: 071986485

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