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MBR TREATMENT FOR LOW LEVELS OF PHOSPHORUS

机译：MBR处理低水平的磷

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A demonstration project was initiated to determine the ability of a Membrane Bioreactor (MBR)rnfacility to consistently meet the requirements of the Michigan Department of EnvironmentalrnQuality for total phosphorus in the effluent to be less than 0.03 mg/l. In order to ensure that thernprocess would function during adverse wintertime conditions the study was performed during arnperiod from October 14, 2004 through March 15, 2005. The process incorporated the use ofrnalum precipitation and a Kubota, flat-plate membrane module in an Enviroquip designed pilotrnsystem. The facility was operated by Highland Treatment, Inc and analytical work wasrnperformed by several certified laboratories.rnThe MBR operated at a constant flux of 10.0 gfd and at MLSS concentrations varying betweenrn6,940 and 26,180 mg/l and at freezing temperatures. Membrane permeability remained highrnthroughout the study indicating no irreversible or permanent fouling had occurred, even duringrnevents where one or more of the MBR basins froze over, resulting in a mechanical failure. Thernmaximum recorded Trans-Membrane Pressure (TMP) was 1.9 psi with an average of 0.5 psi.rnTo maintain membrane performance, one maintenance clean-in-place (CIP) was performedrnduring the six-months of operation. Using a 0.5% solution of sodium hypochlorite the CIP tookrnapproximately three hours.
机译：启动了一个示范项目，以确定膜生物反应器（MBR）设施能否始终满足密歇根州环境质量局的要求，以使废水中的总磷低于0.03 mg / l。为了确保该过程在不利的冬季条件下能够正常运行，本研究在2004年10月14日至2005年3月15日的养蜂期进行。该过程在Enviroquip设计的中试系统中结合了使用铝沉淀和Kubota平板膜组件。该设施由Highland Treatment，Inc.运营，分析工作由多家认证实验室进行。rnMBR在10.0 gfd的恒定通量和MLSS浓度介于6,940和26,180 mg / l之间并在冷冻温度下运行。在整个研究过程中，膜的渗透性仍然很高，这表明没有发生不可逆转的或永久性的结垢，即使在一个或多个MBR盆地冻结并导致机械故障的事件中也是如此。记录的最大跨膜压（TMP）为1.9 psi，平均为0.5 psi。为了保持膜性能，在运行的六个月内进行了一次就地清洁（CIP）。使用0.5％的次氯酸钠溶液，CIP花费了大约三个小时。

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