赤子爱胜蚓处理污泥对其性质变化的影响  

Effect of vermicomposting using Eisenia foetida on properties of sewage sludge

作　　者：陈学民[1] 王惠[1] 伏小勇[1] 黄魁[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《环境工程学报》2010年第6期1421-1425,共5页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07317-008);甘肃省建设科技攻关项目(JK2008-18)

摘　　要：用赤子爱胜蚓(Eisenia foetida)直接处理脱水污泥,以不加蚯蚓为对照,研究了蚯蚓生物量、污泥理化性质(pH、电导、灰分、总有机碳)、营养物质(氮、磷、钾)以及重金属(铜、锌、铅、铬)的变化。结果表明:蚯蚓能很好地适应直接投加污泥的生存环境,蚯蚓平均增重0.7 g/d,产卵4.81个/d。随着时间的增加,接种蚯蚓的污泥理化性质和营养物质以及重金属含量均有显著的变化。蚯蚓处理后,污泥的pH由7.83显著降低至7.03;电导由0.46 S/m显著增至2.23 S/m;灰分从43.89%显著增至57.53%;TOC由32.32%显著降低至23.59%;污泥中的营养物质N、P、K含量显著增加,N、P、K分别提高了37.48%、19.96%和20.14%;同时蚯蚓活动显著降低了污泥中的重金属含量,降低次序为Cu>Zn>Cr>Pb。蚯蚓处理后污泥小团粒性状明显,无臭味,不生蛆。Vermicomposting of sewage sludge using Eisenia foetida directly,compared with not adding earthworm,the change of earthworm biomass,physiochemical properties（pH,EC,ash and TOC）,nutrients（nitrogen,phosphorous and potassium） and heavy metal（Cu,Zn,Pb and Cr） in sewage sludge were studied during experiment.The results suggested that earthworms could adapt well to the living environment of direct add sludge during vermicomposting,and that the average growth and reproduction were 0.7 g/d and 4.81cocoon/d respectively.With increased time,vermicomposting showed significant change of chemical properties and nutrients and heavy metal content.After vermicomposting,the results indicated significant reduction in pH value（7.83 to 7.03） and TOC（32.32% to 23.59%）,while significant increase in EC（0.46 S/m to 2.23 S/m） and ash（43.89% to 57.53%）.The percentage of nitrogen,phosphorous and potassium in vermicompost was found to significantly increase by 37.48%,19.96% and 20.14% respectively.At the same time,earthworm activity resulted in a significant decrease of heavy metal content of sludge.The order of earthworm absorbing the heavy metal was CuZnCrPb.After vermicomposting,the production showed small aggregate traits obviously,no odor and maggots.

关 键 词：蚯蚓 污泥 理化性质 营养物质 重金属 

分 类 号：X705[环境科学与工程—环境工程]