| 引用本文: | 梁恒,唐小斌,王金龙,陈睿,李圭白.无清洗重力驱动超滤工艺净水效能及机理[J].哈尔滨工业大学学报,2020,52(6):103.DOI:10.11918/202003022 |
| LIANG Heng,TANG Xiaobin,WANG Jinlong,CHEN Rui,LI Guibai.Performance and mechanisms of gravity-driven membrane filtration for water treatment without cleaning[J].Journal of Harbin Institute of Technology,2020,52(6):103.DOI:10.11918/202003022 |
|
| |
|
|
| 本文已被：浏览 1860次 下载 844次 |
码上扫一扫！ |
|
|
| 无清洗重力驱动超滤工艺净水效能及机理 |
|
梁恒,唐小斌,王金龙,陈睿,李圭白
|
|
(城市水资源与水环境国家重点实验室(哈尔滨工业大学),哈尔滨 150090)
|
|
| 摘要: |
| 基于分散式供水及常规超滤工艺的不足,研发了重力驱动膜过滤工艺（简称GDM）,其结合生物滤饼层和超滤膜双重截留功效,兼具无清洗、无药剂、操作简单、低能耗、低维护等优点.采用GDM工艺净化河水、水库水、江水和模拟配水,长期运行其通量均可达到稳定状态,表明GDM工艺对不同类型的水源水具有普适性.原水水质、驱动压力、膜组件类型、膜材质、膜孔径大小、温度、间歇过滤、预处理等运行条件会影响生物滤饼层的结构和组成特性,从而影响GDM的稳定通量和膜污染特性.GDM工艺通量稳定性主要受生物作用调控的膜面生物滤饼层结构和组成特性影响,生物滤饼层结构越粗糙、孔隙越发达、胞外分泌物（EPS）质量浓度越少,稳定通量越高.相比常规超滤工艺,GDM膜面生物滤饼层可有效地强化对浊度、可生物同化有机碳（AOC）及氨氮等污染物的去除效能.此外,采用缓速滤池预处理工艺可有效地改善膜面生物滤饼层的结构特性,提高GDM稳定通量和污染物去除效能,研究成果有助于推动超滤技术在分散式供水领域中的应用. |
| 关键词: 重力驱动膜过滤（GDM） 生物滤饼层 膜污染 通量稳定性 分散式供水 |
| DOI：10.11918/202003022 |
| 分类号:TU991 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51778170)； 中国博士后面上基金(2019M651290) |
|
| Performance and mechanisms of gravity-driven membrane filtration for water treatment without cleaning |
|
LIANG Heng,TANG Xiaobin,WANG Jinlong,CHEN Rui,LI Guibai
|
|
(State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology), Harbin 150090, China)
|
| Abstract: |
| Based on the problems of decentralized water supply and conventional ultrafiltration process, a gravity-driven membrane (GDM) filtration process was developed, which combined the dual rejections between bio-cake layer and ultrafiltration membrane and had the advantages of no cleaning, no chemical supply, simple operation, low energy consumption, and low maintenance. Results showed that flux stabilizations of GDM were observed during the long-term treatments of river water, reservoir water, and synthesized water, indicating the practical universality of GDM process in treating different types of water resources. The operating conditions, including raw water quality, operating pressure, membrane configuration type, membrane material, membrane pore size, temperature, intermittent filtration, and pre-treatment, affected the structures and compositions of bio-cake layer formed on the membrane surface, and consequently exerted impacts on the stable flux of GDM and its membrane fouling characteristics. Flux stabilization of GDM process was mainly determined by the structures and compositions of bio-cake layer regulated by the biological activities. The bio-cake layer with rougher structures, more abundant pores, and less extracellular polymeric substance (EPS) excretions, could contribute to a higher stable flux in long-term GDM filtration. Compared with conventional ultrafiltration process, the bio-cake layer formed on the surface of GDM could efficiently enhance the removal performance for turbidity, assimilable organic carbon (AOC), and ammonia. In addition, pre-treatment of slow filter could effectively modify the structural characteristics of bio-cake layer, improve the stable flux of GDM, and enhance the removal performance. The findings of this paper are expected to promote the extensive applications of ultrafiltration technology in decentralized drinking water supply. |
| Key words: gravity-driven membrane (GDM) filtration bio-cake layer membrane fouling flux stabilization decentralized water supply |
|
|
|
|
