2种表居型蚯蚓处理污泥的比较研究

用微小双胸蚓(Bimastus parvus)和赤子爱胜蚓(Eisenia foetida)2种表居型蚯蚓处理城市生活污泥,研究了污泥理化性质和污泥减量以及蚯蚓生物量的变化,比较2种蚯蚓对污泥的处理效果.结果表明,2种蚯蚓对污泥的矿化、降解及减量能力基本一致.接种双胸蚓和爱胜蚓污泥的pH分别降至6.27、7.07,接种双胸蚓使污泥的N、P、K含量分别增加了31.96%、5.76%、17.91%,C/N、C/P降低了44.14%、30.69%;接种爱胜蚓使污泥的N、K含量分别增加了35.48%、11.58%,P含量、C/N、C/P降低了10.12%、46.73%、20.50%.接种双胸蚓和爱胜蚓均能降低污泥中重金属含量,其降低次序分别为ZnCuPbCr和CuZnPbCr.实验结束后,2种蚯蚓的体重、卵数均显著增加,其生长率和生产率分别为76%～86%、156%～131%.

Comparative Studies on Vermicomposting of Sewage Sludge with Two Epigeic Earthworms

A comparative study was conducted two epigeic species earthworms (Bimastus parvus and Eisenia foetida) for the evaluation of their efficacy in vermicomposting of sewage sludge. The various changes studied during pot experiments were the physiochemical properties of the sewage sludge, sludge reduction and earthworm biomass. Vermicomposting resulted that both epigeic species earthworms showed same capability among sewage sludge mineralization and decomposition rate and reduction. By the end of experiment, the pH value declined to 6.27 with B. parvus and 7.07 with E. foetida , but both epigeic species earthworms showed same mineralization and decomposition rate.B. parvus produced 31.96%, 5.76% and 17.91% increases in nitrogen, phosphorus, and potassium as well as 44.14% and 30.69% decreases in C/N and C/P ratios as compared to initial after 30 days of inoculation. In contrast, E. foetida produced 35.48% and 11.58% increases in nitrogen and potassium as well as 10.12%, 46.73% and 20.50% decreases in phosphorus, C/N and C/P ratios as compared to initial after 30 days of earthworm activity. At the same time, both epigeic species earthworms resulted in significant reduction in heavy metal content. The reduction in heavy metal content forB. parvus and E. foetida was found in the order: Zn>Cu>Pb>Cr and Cu>Zn>Pb>Cr. At the end of experiment, the weight and cocoons of B. parvus and E. foetida showed significant increase, which the growth rate and the reproductive rate were 76%-86% and 156%-131% respectively.