Hydrothermal carbonization(HTC)is a promising technology for the coversion of swine manure(SM)for hydrochars(HCs).Currently,information on the humification of organic matter is limited during the HTC of SM,and its pot...Hydrothermal carbonization(HTC)is a promising technology for the coversion of swine manure(SM)for hydrochars(HCs).Currently,information on the humification of organic matter is limited during the HTC of SM,and its potential correlation with the passivation of heavy metals(HMs)remains unclear,which is crucial referece for the land application of SM-derived HCs.This study systematically investigated the humification of organic matter and the passivation of HMs during the HTC of SM and then explored their intrinsic connection.The HTC treatment can enhance the humification of organic matter,and the HCs obtained at 240℃ had the best humification effect,with the highest content of humus(83.84 mg·g^(-1)versus 41.97 mg·g^(-1)in SM)and humification rate(28.89%versus 15.73%in SM).Dissolved organic carbons(DOC)and readily oxidized organic carbons(ROC)were more easily degraded in the HTC of SM,and part was further converted into inactive organic carbon.HMs(Cu,Zn,Pb,and Cr)were enriched in HCs,but all HMs were largely passivated.The ecological risk of multi-HMs was reduced from moderate risk in SM to low risk in HCs.The percentages of HMs in exchangeable/acid-soluble forms were positively correlated with the contents of DOC and negatively correlated with the ratio of humic acids to fulvic acids(P<0.05).It was inferred that the humification of organic matter promoted the passivation of HMs in the HTC of SM.This study provided deeper insights into the humification of organic matter and it's intrinsic correlation with HMs-passivation during the HTC of SM.展开更多
基金support of the Jiangxi Province Colleges and Universities Humanities and Social Science Key Research Base Project(JD23050)the Jiangxi Province Agricultural Key Core Technology Research Project(JXNK202307-03-01-02)the Natural Science Foundation of Jiangxi Province,China(20192BAB203019)。
文摘Hydrothermal carbonization(HTC)is a promising technology for the coversion of swine manure(SM)for hydrochars(HCs).Currently,information on the humification of organic matter is limited during the HTC of SM,and its potential correlation with the passivation of heavy metals(HMs)remains unclear,which is crucial referece for the land application of SM-derived HCs.This study systematically investigated the humification of organic matter and the passivation of HMs during the HTC of SM and then explored their intrinsic connection.The HTC treatment can enhance the humification of organic matter,and the HCs obtained at 240℃ had the best humification effect,with the highest content of humus(83.84 mg·g^(-1)versus 41.97 mg·g^(-1)in SM)and humification rate(28.89%versus 15.73%in SM).Dissolved organic carbons(DOC)and readily oxidized organic carbons(ROC)were more easily degraded in the HTC of SM,and part was further converted into inactive organic carbon.HMs(Cu,Zn,Pb,and Cr)were enriched in HCs,but all HMs were largely passivated.The ecological risk of multi-HMs was reduced from moderate risk in SM to low risk in HCs.The percentages of HMs in exchangeable/acid-soluble forms were positively correlated with the contents of DOC and negatively correlated with the ratio of humic acids to fulvic acids(P<0.05).It was inferred that the humification of organic matter promoted the passivation of HMs in the HTC of SM.This study provided deeper insights into the humification of organic matter and it's intrinsic correlation with HMs-passivation during the HTC of SM.
