Membrane fouling controlled by coagulation/adsorption during direct sewage membrane filtration（DSMF） for organic matter concentration

• Published in: 环境科学学报：英文版 2015 (6), p.1-7
• Main Author: Hui Gong Zhengyu Jin Xian Wang Kaijun Wang
• Format: Article
• Language: English
• Subjects: 制膜; 化学需氧量; 有机物浓度; 污染物; 污水处理; 混凝吸附; 膜过滤过程; 预处理工艺
• ISSN: 1001-0742; 1878-7320

Unlike the role of the membrane in a membrane bioreactor, which is designed to replace a sediment tank, direct sewage membrane filtration（DSMF）, with the goal of concentrating organic matters, is proposed as a pretreatment process in a novel sewage treatment concept. The concept of membrane-based pretreatment is proposed to divide raw sewage into a concentrated part retaining most organics and a filtered part with less pollutant remaining, so that energy recovery and water reuse, respectively, could be realized by post-treatment. A pilot-scale experiment was carried out to verify the feasibility of coagulant/adsorbent addition for membrane fouling control, which has been the main issue during this DSMF process. The results showed that continuous coagulant addition successfully slowed down the increase in filtration resistance, with the resistance maintained below 1.0 × 1013m~（-1） in the first 70 hr before a jump occurred. Furthermore,the adsorbent addition contributed to retarding the occurrence of the filtration resistance jump, achieving simultaneous fouling control and chemical oxygen demand（COD）concentration improvement. The final concentrated COD amounted to 7500 mg/L after 6 days of operation.