微生物电解池降解乙酸钠的运行条件优化研究  

Optimization of operation conditions for degradation of sodium acetate using microbial electrolysis cell

作　　者：陈卫[1,2] 贾硕秋 胡凯[1,2] 王威 张佩 魏磊 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098 [3]河南省水文水资源局,河南郑州450004

出　　处：《水资源保护》2017年第1期62-66,共5页Water Resources Protection

基　　金：浅水湖泊综合治理与资源开发教育部重点实验室开放基金(2015002);国家自然科学基金青年基金项目(51408194);江苏高校优势学科建设工程(PAPD)项目;河南省科技攻关项目(162102310057);江苏高校品牌专业建设工程资助(TAPP)项目

摘　　要：采用微生物电解池(microbial electrolysis cell,MEC)技术,通过正交试验考察了Na Ac浓度、缓冲液浓度、外加电压和搅拌速度等因素对MEC降解水中乙酸钠效果以及反应器产气效果的影响。试验结果的极差分析表明,各因素对乙酸钠降解效果和产气效果均呈正相关;通过方差分析得出各影响因素对乙酸钠降解性能影响的大小顺序依次为:Na Ac浓度、搅拌速度、外加电压和缓冲液浓度;对产气性能影响的大小顺序依次为:外加电压、缓冲液浓度、Na Ac浓度和搅拌速度。在Na Ac浓度1.5 g/L、缓冲液浓度50 mmol/L、外加电压0.9 V和搅拌速度1 000 r/min的最优条件下,MEC反应器对水中乙酸钠的去除率为98.2%、产气速率为0.148 m3/(m3·d)。研究表明,可以从处理效果或经济性角度优化MEC反应器运行条件,如适当增加搅拌速度、外加电压和缓冲液浓度,提升Na Ac去除率;适当减小搅拌速度可以获得相似的产气速率,且降低能耗。In this study, an orthogonal test was used to investigate the effects of factors including the NaAc concentration, buffer concentration, applied voltage, and agitation speed on the removal efficiency of sodium acetate and gas production rate in a microbial electrolysis cell （MEC）. The results of range analysis show that each factor was positively related to the removal efficiency of sodium acetate and the gas production rate. The results of variance analysis show that the factors are ranked in the following descending order according to their effects on the degradation of sodium acetate：the NaAc concentration, agitation speed, applied voltage, and buffer concentration;and according to their effects on the gas production rate, the factors are ranked in the following descending order： the applied voltage, buffer concentration, NaAc concentration, and agitation speed. The MEC had optimal performance with a sodium acetate removal efficiency of 98. 2% and a gas production rate of 0. 148 m3/（ m3 · d ） under the optimal conditions of the NaAc concentration of 1. 5 g/L, the buffer concentration of 50 mmol/L, the applied voltage of 0. 9 V, and the agitation speed of 1000 r/min. This study shows that the operation conditions of the MEC could be optimized in terms of treatment efficiency or economical efficiency. For example, increasing the agitation speed, applied voltage, and buffer concentration could enhance the NaAc removal efficiency to some extent, and decreasing the agitation speed could result in a similar gas production rate with reduced energy consumption.

关 键 词：微生物电解池 正交试验 乙酸钠 氢气 影响因素 

分 类 号：X703.1[环境科学与工程—环境工程]