摘要
通过沉降 /离心法将城市污泥区分为生物絮凝体、颗粒态、胶体及水溶态四种组分 ,并研究了重金属与养分元素在其中的分配及其各组分中重金属的化学形态 .生物絮凝体组分占污泥干物质 6 8% ,其次为颗粒态组分 (占 2 3% ) ,胶体及水溶态组分所占比例最少 .有机C ,总N ,P ,K及Cu ,Pb ,Zn ,Cd ,Hg ,As也主要分配在生物絮凝体组分中 .从重金属在各组分中的形态分布看 ,重金属的化学活性依次为 ,污泥水溶性 +胶体组分 >生物絮凝体组分 >颗粒态组分 .但按不同组分对污泥中重金属“活性库”的贡献看 ,则生物絮凝体组分 >水溶性 +胶体组分 >颗粒态组分 .生物絮凝体组分是污泥中有效重金属的主要提供者 .
Undigested sewage sludge can be divided effectively into 4 components (biofloculent,particulate,colloid and soluble) by precipation\|centrifuge method. 66%—84% of heavy metals in sludge were found in biofloc,14%—27% in particulate,0 15%—13 4% in soluble,and less than 4% in colloid.In unfractionated sludge,Cu was mainly distributed between organic matter bound by higher energy bond and residue,to a similar extend;Zn was weakly bound to organic matter;while Cd existed mainly in exchangeable and weakly bound to organic matter forms.The distribution pattern of chemical forms of metals in biofloc component was similar to that in unfractionated sludge.It was found that in particulate component almost all metals were contributed to the less available forms.It is concluded that the available amount of sludge\|born metals in sludge\|treated soil depended on,to a great extent,the decomposition of the sludge biofloc component.
出处
《环境科学学报》
CAS
CSCD
北大核心
2000年第3期269-274,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金和国际科学基金!(IFS
C/ 2 6 6 9 1)
关键词
污泥
重金属
养分元素
化学形态
废水处理
Sewage sludge
component
heavy metal
fractionation
availability
