郇辉辉, 储昭霞, 王兴明, 范廷玉, 董众兵, 甄泉, 张佳妹, 代碧波. 蚯蚓粘液-秸秆炭共同作用对生活污泥堆肥中重金属的影响[J]. 中国生态农业学报 (中英文), 2023, 31(4): 577−586. DOI: 10.12357/cjea.20220253
引用本文: 郇辉辉, 储昭霞, 王兴明, 范廷玉, 董众兵, 甄泉, 张佳妹, 代碧波. 蚯蚓粘液-秸秆炭共同作用对生活污泥堆肥中重金属的影响[J]. 中国生态农业学报 (中英文), 2023, 31(4): 577−586. DOI: 10.12357/cjea.20220253
HUAN H H, CHU Z X, WANG X M, FAN T Y, DONG Z B, ZHEN Q, ZHANG J M, DAI B B. Effects of earthworm mucus and straw charcoal on heavy metals during domestic sludge co-composting[J]. Chinese Journal of Eco-Agriculture, 2023, 31(4): 577−586. DOI: 10.12357/cjea.20220253
Citation: HUAN H H, CHU Z X, WANG X M, FAN T Y, DONG Z B, ZHEN Q, ZHANG J M, DAI B B. Effects of earthworm mucus and straw charcoal on heavy metals during domestic sludge co-composting[J]. Chinese Journal of Eco-Agriculture, 2023, 31(4): 577−586. DOI: 10.12357/cjea.20220253

蚯蚓粘液-秸秆炭共同作用对生活污泥堆肥中重金属的影响

Effects of earthworm mucus and straw charcoal on heavy metals during domestic sludge co-composting

  • 摘要: 生活污泥中富含的重金属限制其资源化利用, 为钝化重金属活性, 降低污泥毒害效果和提高其利用价值, 以40 mL蚯蚓粘液和2%、4%、6%、8%秸秆炭为添加剂对2 kg污泥进行堆肥, 研究粘液、粘液协同秸秆炭添加对污泥堆肥后重金属变化的影响。结果显示, 与对照组污泥堆肥相比, 粘液堆肥污泥后pH升高1.42%, 总氮、总磷含量降低7.87%、14.18% (P<0.05); 而粘液协同秸秆炭堆肥污泥后, 污泥逐渐呈碱性, 电导率提升5.71%~9.58% (P<0.05), 有机质含量升高7.71%~24.60% (P<0.05), 丰富了堆体中可溶性离子和有机物含量, 但总氮、总钾含量分别降低19.10%~30.95%、7.87%~14.31%。在添加粘液对污泥堆肥后, 重金属总量均表现出下降趋势, Ni、Zn、Pb的较活泼形态向难以降解的残渣态转化, 使残渣态所占比例较CK处理分别升高61.81%、120.19%、72.51%; 当添加粘液和秸秆炭对污泥堆肥后, 重金属总量继续表现出下降趋势, 碳酸盐结合态Ni和Pb、铁锰结合态Pb、可交换态Zn逐步向稳定的残渣态转化, 而有机结合态Cu却向可交换态和残渣态转化, 钝化了堆肥污泥中Ni、Zn、Pb, 活化了Cu。最后根据分析得出结论, 粘液协同秸秆炭改变污泥中pH来影响重金属Ni、Zn、Pb、Cu有效态, 粘液+8%秸秆炭处理对污泥重金属的影响较为理想。

     

    Abstract: Heavy metals restrict the reuse of municipal sludge. To passivate the activity of heavy metals, reduce sludge toxicity, and create new value, 2 kg of sludge was composted with 40 mL earthworm mucus and 2%, 4%, 6%, and 8% straw charcoal, to investigate changes in the heavy metal mobility in sewage sludge. The results showed that, compared with the control sludge compost (CK), the pH increased by 1.42% (P<0.05) and the total nitrogen and total phosphorus decreased by 7.87% and 14.18%, respectively (P<0.05), after the addition of the mucus to the sludge. After adding both the mucus and straw charcoal to the sludge compost, the sludge gradually became alkaline; furthermore, its electrical conductivity value increased by 5.71%−9.58% (<