Research on the formation and degradation of methylmercury during aerobic composting of municipal sewage sludge
MAO Yuxiang
LIU Xiaozhen
MA Bingjuan
TAI Chao
ZHAGN Yuan
LI Wei
LIU Jun
Abstract：In order to investigate the mechanisms of methylmercury (MeHg) formation and degradation during aerobic composting of sewage sludge,the static forced-aeration composting experiments under different treatment conditions were carried out.The results show that contents of oxygen decreased firstly and then increased during the composing process,whereas contents of MeHg rose up at first and dropped subsequently.The enhancement of anaerobic conditions and higher soluble sulfate could stimulate the formation of MeHg.In general,the content of MeHg in the composting product was between 1.21 ～2.25 ng/g,which was around 4 ～ 10 times as it in the raw material.Thus,the exposure level of MeHg in land use may be increased after the treatment of municipal sewage sludge compost,and the ecological risk induced by MeHg should be carefully assessed when applying sewage sludge compost to farmland.Mitigation measures such as optimizing ventilation strategy and extending the stabilization period would be applied for inhibiting the formation of MeHg.
Keywords：municipal sewage sludgecompostingmethylmercurymethylationdemethylation
Publication Date：2017-09-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 60-65 )