MBR工艺运行优化措施和膜污染控制
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摘要
MBR工艺因为出水水质好,迎合了特许经营服务协议对水质标准提高的要求,然而其能耗高以及用于脱氮除磷的化学药剂费等会增加污水厂的可控成本。以北京某10×10~4m~3/d MBR工艺再生水厂为例,从优化控制溶解氧入手,对气水比、水力停留时间、污泥浓度等关键因素进行管理,在高效脱氮、生物除磷和节能降耗方面取得较好的效果。另外,从化学清洗、膜吹扫、鼓风机风量配置、膜池进水量、膜泄漏等方面介绍了膜的抗污染和稳定运行的措施。
MBR process could meet the requirements of the franchise service agreement for the improvement of water quality standards due to its good effluent quality. However,its high energy consumption and chemical fees for nitrogen and phosphorus removal would increase the controllable cost of the sewage plant. Taking a MBR recycling water plant with the capacity of 100 000 m~3/d in Beijing as an example,the dissolved oxygen was optimally controlled and the key factors such as gas and water ratio,hydraulic retention time and sludge concentration were managed to achieve efficient nitrogen removal,biological phosphorus removal,energy saving and consumption reduction. In addition,the antipollution of membrane and stable operation measures were introduced from the aspects of chemical cleaning,membrane purging,blower air volume configuration,the membrane tank inflow and membrane leakage.
MBR process could meet the requirements of the franchise service agreement for the improvement of water quality standards due to its good effluent quality. However,its high energy consumption and chemical fees for nitrogen and phosphorus removal would increase the controllable cost of the sewage plant. Taking a MBR recycling water plant with the capacity of 100 000 m~3/d in Beijing as an example,the dissolved oxygen was optimally controlled and the key factors such as gas and water ratio,hydraulic retention time and sludge concentration were managed to achieve efficient nitrogen removal,biological phosphorus removal,energy saving and consumption reduction. In addition,the antipollution of membrane and stable operation measures were introduced from the aspects of chemical cleaning,membrane purging,blower air volume configuration,the membrane tank inflow and membrane leakage.
引文
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