超滤在乙醇厌氧沼液资源化回用中的应用  

Application of ultrafiltration in treatment of ethanol anaerobic digestion effluent for recycling use

作　　者：王团 薛宏光 王柯[1,2] 毛忠贵[1,2] 张建华[1,2] WANG Tuan1,2,XUE Hongguang3,WANG Ke1,2,MAO Zhonggui1,2,ZHANG Jianhua1,2(1. School of Biotechnology, Jiangnan University, Wuxi 214122, China 2. Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China 3. Jiangsu Jinmaoyuan Biochemical Co. Ltd., Lianyungang 222111, Chin)

机构地区：[1]江南大学生物工程学院,无锡214122 [2]江南大学工业生物技术教育部重点实验室,无锡214122 [3]江苏金茂源生物化工有限责任公司,连云港222111

出　　处：《环境工程学报》2018年第4期1046-1054,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年科学基金资助项目(21506075);江苏省自然科学基金青年基金资助项目(BK20150131);111引智计划(111-2-06);江苏省连云港市"港城英才计划"

摘　　要：厌氧沼液经资源化处理后回用于生产,可有效解决传统乙醇生产过程耗水量大和废水处理成本高等突出问题。鉴于超滤是去除厌氧沼液中微生物的常用手段,该方法对管式超滤膜用于处理乙醇厌氧沼液的可行性开展了研究。结果表明:在沼液温度50℃、膜面流速为4.5m·s^(-1)、产水率30%的最佳条件下,膜通量达到174L.(m^2·h)^(-1);膜污染包括无机污染和有机污染,无机污染主要有Ca^(2+)、Mg^(2+)和Fe^(3+)等,有机污染较为复杂,包括烃、脂肪酸及其衍生物以及腐殖酸、富里酸等;最佳清洗策略是先用柠檬酸和NaClO清洗,然后用NaOH进行清洗,膜通量恢复率达到了98%以上。超滤可以有效去除厌氧沼液中的微生物,避免拌料粉浆的酸化。Recycling the treated anaerobic digestion effluent（ADE） for use in ethanol production process can alleviate some problems such as large water consumption in production process and the subsequent expensive wastewater treatment for standardized discharge. Considering that ultrafiltration（UF） membrane is instrumental for the removal of microorganisms contained in the ADE, this method focused on the feasibility of tubular ultrafiltration（UF） membrane to treat the ADE for the future recycling use. Results showed that the reasonable condition was the ADE temperature of 50℃, membrane surface velocity of 4.5 m·s^（-1） and water production rate of 30%. Under the controlled condition, a desired membrane flux was obtained to be 174 L-（m^2·h）^（-1）. Further, the membrane fouling was taken into consideration. It was found that the pollutants should be divided into inorganic compounds, mainly consisting of metal elements Ca^（2＋）, Mg^（2＋）, Fe^（3＋）, and organic substances, i.e., hydrocarbons, fatty acids and their derivatives, humic acid and fulvic acid. Exploration of membrane washing method showed that these foulants were removed using citric acid and sodium hypochlorite solution, followed by sodium hydroxide solution. With this membrane washing method, the membrane flux recovered above 98%. These results indicate that the UF treatment can effectively remove the microorganisms living in the ADE to avoid the slurry acidification in the ethanol production process.

关 键 词：超滤 去除微生物 厌氧沼液 回用 膜污染和清洗 

分 类 号：X797[环境科学与工程—环境工程]