The process of biotransformation can produce insect protein and promote the effective inactivation of heavy metals

文献类型： 外文期刊

第一作者： Xu, Hanjing

作者： Xu, Hanjing;Hong, Chunlai;Yao, Yanlai;Wang, Weiping;Zhu, Weijing;Hong, Leidong;Zhu, Fengxiang;Weng, Jianquan;Zhou, Ying;Liu, Lijun

作者机构：

关键词： Compost; Heavy metal; Inactivation; HA/FA; Maggot manure

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 776 卷

页码：

收录情况： SCI

摘要： An experimentwas performed to study the inactivation effect of aerobic composting on heavy metals in maggot, pig and chicken manures. After composting, Cu mainly occurred in the oxidizable (OXI) fraction with a percentage distribution above 54%. Zn and Cd mainly existed in the bioavailable factor (BF), which has strong activity, with percentage distributions greater than 88.3% and 82.7%, respectively. Cr and Pb mainly existed in the stable residual (RES) fractionwith a percentage distribution of approximately 50%. The aerobic composting process had a clear inactivation effect on heavy metals. For maggot manure compost in particular, the inactivation effects of Cu, Cr, Zn, Cd, and Pb were very good throughout the composting process, and the inactivation effect of Pb reached 54.42%. In addition, the process of biotransformation by housefly maggots promoted the conversion of fulvic acid (FA) to humic acid (HA) in pig manure, and the final increase in HA/FA after maggot manure composting was the largest among the different types of manure and beneficial to the inactivation of heavy metals. Compounds containing -CH3 and -CH2 groups were reduced, and aromatic structures were enhanced. Moreover, a maggot yield equivalent to 13.2% of the fresh pig manure was achieved during the process of biotransformation. The correlation analysis results showed that moisture content was an important factor affecting the inactivation rates of heavymetals in the threemanure composts. Our results highlight that the process of biotransformation by houseflymaggots can promote composting maturity and the inactivation of heavymetals, and produce a large amount of insect protein, yielding beneficial ecological and economic benefits. (C) 2021 Published by Elsevier B.V.

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