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首页> 外文会议>Membrane technology 2008 >APPLICATION OF MEMBRANE BIOREACTORS FOR ENHANCED NUTRIENTREMOVAL AT A LARGE WASTEWATER TREATMENT FACILITY WITHSIGNIFICANT PEAKING EVENTS
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APPLICATION OF MEMBRANE BIOREACTORS FOR ENHANCED NUTRIENTREMOVAL AT A LARGE WASTEWATER TREATMENT FACILITY WITHSIGNIFICANT PEAKING EVENTS

机译：膜生物反应器在大型污水处理设施大型污水处理设施中强化营养去除的应用

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The Cox Creek Water Reclamation Facility (WRF) is a 15.0 million gallon per day (mgd)rnaverage daily flow municipal wastewater treatment plant, located in Curtis Bay, Maryland, and isrnowned and operated by Anne Arundel County. The facility currently achieves biological nutrientrnremoval (BNR) with an effluent goal of 8.0 mg/L total nitrogen from May 1 through October 31.rnThe new NPDES permit will set annual waste loading allocations for the discharge of nitrogenrnand phosphorus, as well as contain an optimization provision which will require the facility tornachieve an annual average concentration of 4.0 mg/L TN and 0.3 mg/L TP each year regardlessrnof flow. Anne Arundel County is upgrading the facility for enhanced nutrient removal (ENR) tornmeet these limits. The existing activated sludge process will be converted into a membranernbioreactor (MBR) to achieve the ENR limits. The project is currently under design withrnconstruction anticipated to begin in 2008 and be completed by 2010.rnThe ENR process selection for the Cox Creek WRF included a rigorous two-step evaluationrnprocess. An evaluation matrix was developed by the Project Team to evaluate and compare thernENR alternatives. The evaluation matrix included criteria for reliability, constructability,rnoperational impacts and cost. The first step was to develop five general ENR categories thatrnencompassed all applicable ENR processes. The Evaluation Matrix was used to complete thernInitial ENR Screening which resulted in the selection of the three general ENR categories. Thernthree general ENR categories selected were:rn1. Single-Stage Activated Sludge Processrn2. Parallel Suspended Growth Systemrn3. Single-Stage Membrane BioreactorrnMultiple alternatives were developed for each of the general ENR categories. The evaluationrnmatrix was completed for each of the ENR alternatives and use to select one ENR alternativernfrom each of the selected ENR categories for further analysis. The three ENR alternativesrnselected for detailed evaluation are summarized below:rn1. Alternative 1: 4-Stage Bardenpho Process with Integrated Fixed Film Activated Sludgern(IFAS) and Effluent Filtration: This alternative required the conversion of the existingrnMLE tanks to IFAS aeration tanks and construction of pre-anoxic and post-anoxic/re-rnaeration tanks, an additional secondary clarifier and RAS pump station, intermediaternpump station and effluent filters.rn2. Alternative 2: Parallel Oxidation Ditch Treatment Train with Upgrade of the ExistingrnBiological Process: This alternative required the existing aeration tanks to be de-rated andrnconverted from the MLE process to the 4-Stage Bardenpho Process. An adjacent propertyrnwould have to be purchased to construct two oxidation ditches, post-anoxic andrnreaeration tanks, two secondary clarifiers and the ancillary equipment necessary tornoperate the oxidation ditch process. A primary effluent pump station would be required tornpump primary effluent to the parallel oxidation ditch treatment train. Additionally, anrnintermediate pump station and effluent filters were required to treat the blendedrnsecondary clarifier effluent.rn3. Alternative 3: Membrane Bioreactor: This alternative required the conversion of thernseven existing MLE tanks and the construction of one additional tank to four 4-StagernBardenpho reactors. Additionally, new membrane tanks and membrane facility werernrequired to house the membranes and the associated equipment. The Membrane Facilityrnwould have to be located at the site of the existing circular primary clarifiers whichrnwould be demolished. Two new rectangular primary clarifiers are required to replace therndemolished circular primary clarifiers.rnPreliminary designs, site plans and cost estimates were developed for each of the ENRrnalternatives. Capital, operating and maintenance and present worth cost estimates wererndeveloped to assist with the ENR process selection. The evaluation matrix was completed forrneach of the three ENR alternatives. Upon completion of the evaluation matrix Alternative 1 wasrneliminated from further consideration. The final ENR process selection was based on capital andrnO&M cost estimates as well as the non-cost criteria. The MBR proved to be the right choice forrnthe Cox Creek WRF due to very tight site constraints, inadequate existing reactor volume to fullyrnnitrify year-round, inadequate existing secondary clarification facilities, limited hydraulic headrnavailable for process modifications, and the County’s desire to produce as high of quality ofrneffluent as possible with the maximum degree of reliability. A simplified process flowrnschematic of the planned facility is shown in Figure 1.
机译：Cox Creek水回收设施（WRF）是位于马里兰州柯蒂斯湾的平均日流量为1500万加仑/日的日均城市污水处理厂，由安妮·阿伦德尔县（Anne Arundel County）拥有并运营。该工厂目前已实现生物营养物去除（BNR），从5月1日至10月31日的总排放量目标为8.0 mg / L。新的NPDES许可证将为氮和磷的排放设定年度废物负荷分配，并进行优化规定，无论流量如何，该设施每年的年平均浓度都必须达到4.0 mg / L TN和0.3 mg / L TP。安妮·阿伦德尔县（Anne Arundel County）正在对设施进行升级，以增强营养去除能力（ENR）以满足这些要求。现有的活性污泥工艺将转换为膜生物反应器（MBR）以达到ENR限值。该项目目前正在设计中，预计将于2008年开始建设，并于2010年完成。考克斯溪WRF的ENR流程选择包括严格的两步评估流程。项目团队制定了评估矩阵，以评估和比较替代的ENR。评估矩阵包括可靠性，可施工性，对运营的影响和成本的标准。第一步是开发涵盖所有适用的ENR流程的五个常规ENR类别。评估矩阵用于完成初始ENR筛选，从而选择了三个常规ENR类别。选择的三种常规ENR类别为：rn1。单级活性污泥法平行悬浮生长系统rn3。单级膜生物反应器为每个常规ENR类别开发了多种替代品。对每个ENR替代品的评估矩阵均已完成，并用于从每个选定的ENR类别中选择一个ENR替代品，以进行进一步分析。为进行详细评估而选择的三种ENR替代方案总结如下：rn1。备选方案1：带有固定膜活化污泥（IFAS）和废水过滤的4阶段Bardenpho工艺：此备选方案要求将现有的rnMLE储罐转换为IFAS曝气池，并建造前缺氧和后缺氧/再曝气池，额外的二级澄清池和RAS泵站，中间泵站和废水过滤器.rn2。备选方案2：并行升级现有生物工艺的氧化沟处理方案：此备选方案要求降低现有曝气池的容量，并将其从MLE流程转换为4阶段Bardenpho流程。必须购买相邻的物业来建造两个氧化沟，后缺氧和曝气池，两个二级澄清池和辅助设备，以消除氧化沟工艺。将需要一级污水泵站将一级污水泵送到平行氧化沟处理机组。另外，还需要中间的泵站和废水过滤器来处理混合的二级澄清池废水。备选方案3：膜生物反应器：此备选方案需要将七个现有的MLE槽进行转换，并再将一个槽构造为四个4-StagernBardenpho反应器。另外，需要新的膜罐和膜设施来容纳膜和相关设备。膜设施必须位于将要拆除的现有圆形主要澄清池的位置。需要两个新的矩形一级澄清池来代替已拆除的圆形一级澄清池。rn为每种ENR替代方案开发了初步设计，场地计划和成本估算。开发了资本，运营和维护以及现值成本估算，以帮助选择ENR流程。评估矩阵针对三个ENR替代方案完成。在完成评估矩阵后，备选方案1不再考虑。最终的ENR流程选择是基于资本和运营维护成本估算以及非成本标准。 MBR被证明是Cox Creek WRF的正确选择，原因是场地限制非常严密，现有的反应器容量不足以全年进行全面硝化，现有的二级澄清设施不足，可用于工艺改造的水力压头有限，并且该县希望获得高产量。最大程度地保证废液的质量。计划中的设施的简化流程示意图如图1所示。

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