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首页> 外文会议>Membrane technology 2008 >Navigating the Pre-Selection of Membrane Bioreactor (MBR) Equipment in Nantucket,Massachusetts – Lessons Learned
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Navigating the Pre-Selection of Membrane Bioreactor (MBR) Equipment in Nantucket,Massachusetts – Lessons Learned

机译：导航马萨诸塞州楠塔基特的膜生物反应器（MBR）设备的预选–经验教训

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摘要

Nantucket is an Island resort community located approximately 26 miles off the southern coastrnof Massachusetts Access to the Island is limited to boat or airplane, which makes delivery ofrnbuilding materials, chemicals, and other supplies difficult and costly to arrange. Interruptions inrntravel are frequently experienced during the winter due to rough seas, or fog. These conditionsrnmake it difficult and costly to implement heavy construction on the Island.rnThe Surfside WWTF has historically provided chemically enhanced primary treatment usingrncoagulants such as aluminum hydroxide and anionic polymer. Effluent is discharged into thernIslands sole source aquifer using open sand rapid infiltration basins. In late 2002 the Townrnreceived an administrative consent order from the Massachusetts Department of EnvironmentalrnProtection (DEP) to upgrade the level of treatment from primary to advanced treatment tornachieve effluent total nitrogen concentrations of 10.0 mg/L or less on a year round basis, and tornincrease the capacity of the existing facility from 1.8 million gallons per day (mgd) up to 3.5rnmgd.. The Town began work on a sequencing batch reactor (SBR) to provide biological nutrientrnremoval (BNR), and performed a value engineering (VE) study using the Preliminary (30rnPercent) Design Report to verify selection of the BNR process. The VE team recommended thatrnthe Town consider the use of MBR technology for the upgrade and expansion for the followingrnreasons:rn1. Sole source aquifer, possible requirements to implement extensive water reuse program.rn2. Potential for more stringent effluent discharge limits in the future due to the sole sourcernaquifer.rn3. Sole source concrete supplier on the Island, important to minimize quantities of concreternused in the upgrade and expansion to control costs.rn4. Limited site availability due to extensive on-site area used for rapid infiltration basins,rnand close proximity to the Atlantic Ocean.rnAlthough the MBR process was estimated to have a slightly higher life-cycle cost compared tornthe SBR design. However, the Town elected to proceed with the MBR design based on thesernnon-economic considerations.rnDuring the design the following types of MBR equipment were chosen for consideration basedrnon each manufacturer list of installations, length of service, track record, and site visits to otherrnoperating MBR facilities:rn1. Immersed hollow fiber gravity or pumped flow.rn2. Immersed flat plate gravity or pumped flow.rnIt was decided to allow all four system types in the specifications to maximize competitivernbidding. The base contract drawings showed a immersed flat plate gravity flow arrangement inrnorder to define the required tank volume, and process layout. The specifications outlined thernprocess performance parameters, and equipment requirements, and evaluation criteria for thernpre-selection.rnManufacturers were required to arrange their system to fit within the confines of the structurerndesigned. Tank volumes could be re-proportioned by the manufacturer, but the total volume ofrnthe MBR process tanks could not be reduced. Manufacturers were required to submit detailedrnlayout and electrical drawings, pricing data on all components, energy consumption, cleaningrnfrequency, and chemical usage information on detailed proposal forms one month prior to therngeneral bid. Each manufacturer submittal was rated on the following:rn3. Life-cycle cost (capital and O&M)rn4. Number of similar size applications and track recordrn5. Pretreatment requirementsrn6. Cleaning requirements and frequencyrnAfter a two week review period the most favorable system was selected and the pre-selectedrnvendor was published by addendum that included detailed arrangement and electrical drawingsrnand guaranteed maximum purchase price as a bid allowance.rnThis paper will outline the MBR design parameters, evaluation criteria, life cycle costs, andrnlessons learned during the complex pre-selection process for this large project.
机译：Nantucket是一个岛屿度假社区，位于马萨诸塞州南部海岸约26英里处，只能通过船或飞机进入该岛，这使得建筑材料，化学药品和其他物资的运送变得困难且费用高昂。由于汹涌的大海或大雾，冬季经常发生中断旅行。这些条件使得在岛上进行繁重的施工变得困难且成本高昂。SurfsideWWTF历来使用凝结剂（如氢氧化铝和阴离子聚合物）提供了化学增强的初级处理。使用开放式沙子快速渗透池将污水排入岛上唯一的源含水层。 2002年下半年，该镇收到了马萨诸塞州环境保护部（DEP）的行政许可命令，将处理水平从初级处理提高到高级处理，以使全年的污水总氮浓度达到或低于10.0 mg / L，并增加现有设施的容量从每天180万加仑（mgd）到3.5rnmgd。。该镇开始研究测序间歇反应器（SBR），以提供生物营养去除（BNR），并使用以下方法进行了价值工程（VE）研究：初步（30％）设计报告，以验证是否选择了BNR工艺。 VE团队建议城镇考虑使用MBR技术升级和扩展以下原因：rn1。单一水源含水层，可能需要实施广泛的中水回用计划。唯一的sourcernaquifer.rn3可能会在将来导致更严格的废水排放限制。岛上唯一的混凝土供应商，对于最大程度地减少升级和扩展中使用的混凝土数量以控制成本非常重要。由于用于快速渗透盆地的大量现场区域以及靠近大西洋，现场可用性有限。尽管与SBR设计相比，MBR工艺的生命周期成本估计略高。但是，镇政府根据系统的经济考虑选择进行MBR设计。在设计过程中，选择了以下类型的MBR设备作为考虑依据：每个制造商的安装清单，服务时间，跟踪记录以及对其他操作的现场访问MBR设施：rn1。沉浸的中空纤维重力或泵送流量.rn2。沉浸式平板重力或泵送流量。决定允许规范中的所有四种系统类型，以使竞争性投标最大化。基本合同图显示了沉浸式平板重力流布置的顺序，以定义所需的储罐容积和工艺布置。规范概述了过程性能参数，设备要求以及预选的评估标准。要求制造商将其系统布置为适应设计结构的范围。罐的容积可以由制造商重新分配，但是MBR工艺罐的总容积不能减少。制造商必须在总投标书的一个月前，在详细的投标表上提交详细的布局图和电气图纸，所有组件的价格数据，能耗，清洁频率以及化学品使用信息。每个制造商提交的评分如下：rn3。生命周期成本（资本和运维成本）rn4。相似规模的申请和跟踪记录的数量rn5。预处理要求6。清洁要求和频率-经过两周的审查后，选择了最有利的系统，并通过附录发布了预先选择的供应商，其中包括详细的布置和电气图纸-并保证了最高购买价格作为投标津贴。-本文将概述MBR设计参数，评估标准，生命周期成本以及在这个大型项目的复杂预选过程中获得的经验教训。

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