污泥稻秸堆肥过程中重金属及速效氮的转化规律  

Contents of heavy metals and available nitrogen in the compost of sewage sludge and rice straw

作　　者：董秀华[1] 周璟[1] 徐轶群[1] 闫啸[1] 许健[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127

出　　处：《扬州大学学报（自然科学版）》2011年第1期74-78,共5页Journal of Yangzhou University：Natural Science Edition

基　　金：江苏省高校自然科学基础研究计划项目(08KJD610004);扬州大学大学生科技创新基金项目

摘　　要：利用污泥与稻秸按不同比例混合进行好氧堆肥60 d,研究堆体中NH4＋-N、NO3--N、6种重金属（Zn,Cu,Cr,Pb,Cd,Ni）质量分数及乙二胺四乙酸（ethylene diamine tetra-acetic acid,EDTA）浸提的重金属质量分数在堆肥前后的变化情况.结果表明：堆肥后,堆体中NH4＋-N质量分数总体下降,降幅为33.21%~47.71%,而NO3--N的质量分数则增加18.23%~35.12%;堆肥后6种重金属质量分数均有不同程度增加,其中w（Cd）增幅最高,为21.31%;但用EDTA浸提的重金属质量分数均有所下降,最大降幅为18.42%,且以w（污泥）∶w（稻秸）=4∶1混合堆肥的效果最好.This study evaluates the changes of physicochemical properties during the compost of sewage sludge and rice straw in different proportion.The changes of NH＋4-N and NO-3-N content after composting for sixty days are assessed.The value of the total and EDTA extracted metals including Zn,Cu,Cr,Pb,Cd and Ni is also detected.The final results indicate that the content of NH＋4-N is decreased from 33.21% to 47.71% during the composting,and the NO-3-N is increased from 18.23% to 35.12%.The mixture causes a significant increase in total heavy metal concentrations than initial materials and deactivates the heavy metals in rice straw.The increase in Cd content is 21.31%,which is higher than other heavy metals.But the reduction in bioavailability of heavy metals contents in sewage sludge is about 18.42%.The compost effect is better when the mass ratio of sludge and rice straw is 4∶1.

关 键 词：污泥堆肥 稻秸 乙二胺四乙酸 重金属 速效氮 

分 类 号：X705[环境科学与工程—环境工程]