%0 Journal Article
%T Recovery of Copper from Sewage Sludge by Bioleaching-Solvent Extraction- Electrodeposition Process<br>城市污泥中Cu回收研究：生物沥浸-溶剂萃取-电积沉Cu技术
%A CHEN Hai-ping
%A ZHOU Li-xiang
%A WANG Shi-mei
%A LIANG Jian-ru
%A <br>陈海平
%A 周立祥
%A 王世梅
%A 梁剑茹
%J 环境科学
%D 2009
%I 
%X Sewage sludge contains not only a lot of organic matter and plant nutrients, but also some harmful metals. Recovery of sludge-born metals for sewage sludge of high metal content is very important for safe reutilization of sewage sludge and for economic consideration. Here, we reported a recovery technique for sludge-born copper using bioleaching-solvent extraction-electrodeposition(L-SX-EW) process through batch experiments. The tested sludge containing 7 432 mg/kg Cu was collected from Suzhou Wastewater Treatment Plant located in industrial zone of Suzhou City, Jiangsu, China. The results showed that more than 90% of sludge-born Cu could be solubilized into aqueous phase within 72 h through bioleaching process. Furthermore, soluble Cu in the form of Cu~(2+) in bioleached sludge filtrate could be concentrated into organic phase through the extracting operation using 2% solvent extractant M5640 under the optimized condition of 1/3 phase ratio (O/A) and pH 2.0, in which Cu~(2+) extraction efficiency reached more than 95%, whereas the co-existing soluble iron extraction efficiency was less than 10%. Stripping results showed that the Stripping rate of Cu was 80.07% when the phase ratio (O/A) was 2/1 using 1.5 mol/L H_2SO_4 as stripping solvent. After the concentrated Cu~(2+) in acidic aqueous phase was electrolyzed for 6 h at 2.1 V bath voltage and 55 ℃ , more than 90 % of the Cu~(2+) recovery efficiency was achieved in the form of elemental Cu powder. There wasn' t any wastewater generation in this process. Therefore, this L-SX-EW technique exhibited a potential application for the recovery of metal for heavy metal-loaded sludge.
%K Cu
%K sewage sludge
%K copper
%K bioleaching
%K extraction
%K electrodeposition
%K recovery<br>城市污泥
%K 生物沥浸
%K 萃取
%K 电积
%K 回收
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=27DCB51A79839C6D0BA63B51CA1E35E4&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=708DD6B15D2464E8&sid=D01CB29BE4272EE5&eid=9E02EB17A33F7B28&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=26