文献类型：期刊文献

中文题名：基于EDTA淋洗离心—硫酸盐还原菌固化法去除污泥中重金属镉的研究

英文题名：Removal of heavy metal-cadmium in sludge based on EDTA eluting centrifugation-sulfate-reducing bacteria solidification method

作者：陈立航[1];李顺群[1];程学磊[2];申道明[3];付建宝[4]

第一作者：陈立航

机构：[1]天津城建大学土木工程学院,天津300384;[2]中原工学院建筑工程学院,河南郑州450007;[3]新乡学院土木工程与建筑学院,河南新乡453003;[4]中交天津港湾工程研究院有限公司中交第一航务工程局有限公司,天津300222

第一机构：天津城建大学土木工程学院,天津300384

年份：2020

卷号：31

期号：6

起止页码：109-115

中文期刊名：水资源与水工程学报

外文期刊名：Journal of Water Resources and Water Engineering

收录：CSTPCD;;CSCD:【CSCD2019_2020】；

基金：国家自然科学基金项目(41877251);天津市科技支撑重点项目(19YFZCSF00820);中国交建岩土工程重点实验室开放课题(2019-KJ-Y-01)。

语种：中文

中文关键词：污泥;镉;二氨基乙烷四乙酸;淋洗离心;硫酸盐还原菌;形态转化;镉去除

外文关键词：sludge;cadmium(Cd);ethylene diamine tetraacetic acid(EDTA);eluting centrifugation;sulfate-reducing bacteria(SRB);morphological transformation;Cd removal

摘要：为研究如何分离和去除污泥中重金属镉(Cd),采取二氨基乙烷四乙酸(ethylene diamine tetraacetic acid,EDTA)淋洗离心与硫酸盐还原菌(sulfate-reducing bacteria,SRB)固化相结合的方法进行了污泥试验并统计分析了污泥中重金属Cd的形态分布和含量变化。结果表明:在离心力100 g、淋洗时间12 h、淋洗2次和离心温度30℃的条件下采用EDTA对污泥原样进行淋洗离心,污泥中Cd含量由6.793 mg/kg降至5.241 mg/kg,去除率达22.8%。然后采用SRB对淋洗离心后的污泥试样进行固化,不稳定态Cd含量由2.589 mg/kg降至1.103 mg/kg,固化后污泥中的Cd含量低于《绿化种植土壤》(CJ/T 340-2016)中重金属要求的Ⅳ级标准2 mg/kg。与传统单一修复方法相比,该联合方法有效地降低了污泥中活性大、污染程度高形态Cd的含量,减轻了其环境危害性。
In order to study the seperation and removal of cadmium( Cd) from sludge,the morphological distribution and content change of Cd in sludge were analyzed using the combination of ethylene diamine tetraacetic acid( EDTA) eluting centrifugation and solidification of sulfate-reducing bacteria( SRB)method. The results showed that after EDTA eluting centrifugation under the conditions of centrifugal force 100 g,washing time 12 h,washing twice and centrifugation temperature 30 ℃,the Cd content in the sludge decreased from 6. 793 mg/kg to 5. 241 mg/kg,and the removal rate reached 22. 8%. SRB was then used to solidify the sludge after the washing and centrifuging. The content of unstable Cd reduced from 2. 589 mg/kg to 1. 103 mg/kg,which was lower than 2 mg/kg,the standard of grade IV according to the requirement of heavy metal content in greening planting soil( CJ/T 340-2016). Compared with the conventional single remediation method,the combined method can effectively reduce the content of Cd of high activity and pollution degree in the sludge,and alleviate its threat to the environment.