| Author Name | Affiliation | | Yulong Shi | National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology,Harbin 150090, China | | Jun Ma | National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology,Harbin 150090, China | | Daoji Wu | School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250010, China | | Qin Pan | Huainan Capital Water Co., Ltd., Huainan 232003, Anhui, China |
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| Abstract: |
| The primary purpose of this research is to evaluate the feasibility of dissolved air flotation (DAF) as pretreatment process for membrane modules in river water treatment. The performances of DAF in combination with an up-flow membrane biofilter (MBF) and a hollow-fiber ultrafiltration membrane (UFM) were investigated respectively. Removal efficiency of ultraviolet absorbance at 254 nm (UV254), ammonia nitrogen (NH3-N), particle counts and microbial index were measured for both systems. Results showed that DAF was a robust pretreatment process for floc particles separation despite of raw water quality fluctuations. For DAF-UFM system, the monitoring data indicated bacteria breeding, nitrite accumulation in membrane vessel and the ammonia concentration of permeate water even exceeded regulatory limits. By contrast, DAF-MBF system was established via the introduction of multilayer filter media between DAF and curtain type ultrafiltration membrane. In MBF, the matured biological activated carbon (BAC) and zeolite particles guaranteed the efficient removal of both organic matters and ammonia. Moreover, the high dissolved oxygen levels in DAF effluent significantly improved bio-adsorption and degradation of pollutants in MBF. The retention of microorganisms by the membrane not only ensured a high concentration of biomass, but also eliminated the risk of microbes leaking out from MBF. In addition, compared with UFM, the curtain membrane exhibited obviously slower fouling development. These results suggested that the DAF-MBF system was more suitable for purifying raw waters seriously polluted by dissolved contaminants. |
| Key words: dissolved air flotation ultrafiltration particle activated carbon zeolite membrane biofouling |
| DOI：10.11916/j.issn.1005-9113.15307 |
| Clc Number:TU991.2 |
| Fund: |
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| Descriptions in Chinese: |
| 气浮与超滤膜联用技术在地表水处理中的研究 时玉龙1,2，马 军1,2，武道吉3，潘 芹4 （1.哈尔滨工业大学 城市水资源开发利用<北方>国家工程研究中心，哈尔滨 150090；2.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；3.山东建筑大学 市政与环境学院，济南 250101；4.淮南首创水务有限责任公司，安徽 淮南 232003) 创新点说明：1）将气浮与超滤膜组合工艺应用于地表水处理； 2）气浮作为超滤膜预处理工艺可以有效削减后者的固体颗粒物负荷； 3）在气浮与帘式超滤膜组件之间引入由颗粒活性炭与沸石组成的复合滤料，强化了系统对有机物与氨氮的去除。 研究目的： 考察气浮与超滤膜组合工艺对实际水体的处理效果。探索出适用于地表水处理的最优工艺组合形式。 研究方法： 将沿淮某水厂气浮单元分别与管式、帘式超滤膜组件联用。研究两种组合工艺对淮河原水中浊度、UV254、氨氮、颗粒数（＞2 μm）及微生物指标的控制情况。并对膜组件的运行参数进行全程观测。 结果： 气浮对絮体颗粒的显著去除，强化了管式超滤膜对颗粒污染物的截留效果，但膜柱内出现细菌滋生及亚硝酸盐氮积累，此外，滤后水氨氮含量时常超过标准限值。在气浮与帘式超滤膜间装填颗粒活性炭与沸石滤料，组成的气浮-复合滤料膜生物反应器工艺中，气浮充氧促进了滤料表面生物膜对氨氮、有机物污染物的吸附、降解，帘式超滤膜对微生物的高效截留，即保证了反应器内部充足的生物量，又消除了上向流生物滤池可能存在的生物泄露风险。并且较压力式超滤膜，表现出良好的抗生物污染性能。 结论： 气浮与超滤膜组合工艺在地表水处理领域具有很好的应用前景，气浮与管式、帘式超滤膜联用均可对致浊颗粒物形成高效去除。其中，气浮-复合滤料膜生物反应器工艺更适用于处理溶解性污染物突出的水体。 关键词：气浮；超滤膜；颗粒活性炭；沸石；膜污染 |
