厌氧活性污泥处理含金废水的研究  

Treatment of Wastewater Containing Au^(3+) Ions Using the Anaerobic Activated Sludge

作　　者：宋慧平[1] 李鑫钢[1] 孙津生[2] 武振华[1] 尹晓红[3] 

机构地区：[1]天津大学化工学院,天津300072 [2]精馏技术国家工程研究中心,天津300072 [3]天津理工大学化学化工学院,天津300191

出　　处：《高校化学工程学报》2007年第5期853-858,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学面上基金项目(20206024);天津市自然科学面上基金项目(07JCYBJC06800)

摘　　要：为了有效地从含金废水中吸附回收金,提出了一种厌氧活性污泥处理新方法。首先研究了吸附条件及共存Cu2+离子对吸附的影响,进而研究了复合工艺的处理效果。结果表明,吸附Au3+的适宜pH值是1.0～5.5,温度为室温,污泥浓度为2.0g·L-1,吸附时间为1min。在Au3+和Cu2+的单元和二元系统中,污泥对Au3+和Cu2+的吸附均符合Langmiur等温吸附方程。模拟结果表明,二者共存促进了污泥对Au3+的吸附,而严重抑制了对Cu2+的吸附。复合工艺中,活性污泥对Au3+的选择吸附率达99.9%～100%;向选择吸附了Au3+后的溶液中再加入新污泥,可使Cu2+浓度降至0.0400mg·L-1;用硫脲脱附吸附了金的污泥,脱附率达99.5%,使金的回收率可超过98.5%。Using the anaerobic activated sludge （AAS） as bio-adsorbent, a novel complex tecnnological process of wastewater treatment was developed to recover the Au^3＋ ions and remove other metals from the Au^3＋ containing wastewater. The results of the single-factor experiments show that the suitable biosorption conditions are pH of 1.0-5.5, room temperature, adsorbent AAS concentration of 2.0 g.L^-1 and adsorption time of 1 rain, and the adsorptions of Au^3＋ and Cu^2＋ in single and binary systems are all in accordance with Langmiur isotherm model. Simulation results show that the coexistence of Au^3＋ and Cu^2＋ in the binary system reinforces the adsorption of Au^3＋ and the adsorption of Cu^2＋ is prohibited seriously. Using the complex technological process developed, 99.9%-100% of selective adsorption efficiency was reached, and after adding new AAS, the concentration of Cu^2＋ in the supernate can be decreased to about 0.0400 mg.L^-l, this value is far below the request of Integrated Wastewater discharge Standard. Using thiourea as desorbent, the desorption efficiency of gold from gold-adsorbed AAS can be upped to 99.5%, therefore using the complex technological process developed, the total recovery efficiency of gold from artificial Au^3＋ containing wastewater can reach over 98.5%.

关 键 词：金离子 厌氧活性污泥 选择吸附 脱附 

分 类 号：X703.1[环境科学与工程—环境工程] TQ028.15[化学工程]