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首页> 外文会议>Water Environment Federation 75th annual technical exhibition amp; conference (WEFTEC 2002) >CASE STUDY: TREATMENT OF SECONDARY EFFLUENT FOR USE AS COOLING TOWER MAKEUP AT A COMBINED-CYCLE NATURAL-GAS POWERGENERATING FACILITY
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CASE STUDY: TREATMENT OF SECONDARY EFFLUENT FOR USE AS COOLING TOWER MAKEUP AT A COMBINED-CYCLE NATURAL-GAS POWERGENERATING FACILITY

机译：案例研究：处理联合循环天然气发电设施中冷却塔组成的二次废水

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FPL Energy’s Rhode Island State Energy Partners LP (RISEP) has constructed a 540-megawattrncombined-cycle, natural-gas-fired power plant in the town of Johnston, Rhode Island. Duringrnthe development phases of the project, it was determined that an adequate potable and naturalrnwater supply was not available to supply makeup water to the power plant’s cooling towers. Asrna result, RISEP established a working partnership with the neighboring community of Cranston,rnRhode Island to use secondary effluent from the city’s wastewater control facility (WCF),rnnormally discharged to the Pawtuxet River.rnThe use of treated effluent in the cooling towers led the Rhode Island Department ofrnEnvironmental Management (RIDEM) Office of Air Resources to issue stringent permit limits.rnThe permit required the cooling tower supply makeup water to have a total suspended solidsrnconcentration (TSS) of 5 mg/l or less. In addition, the cooling tower makeup water was requiredrnto have a total residual chlorine (TRC) concentration of not less than 1 mg/l at the power plantrn(12 miles away from the facility). To meet these requirements, a filtration and chemical feedrnsystem were proposed to filter particulate matter from the effluent and to provide enhancedrndisinfection using sodium hypochlorite. These processes were incorporated into a tertiaryrntreatment facility located at the Cranston WCF. RISEP’s aggressive schedule required thatrnpermitting, design, construction, and start-up of the tertiary facility be completed inrnapproximately 18 months. Design-build project implementation was selected as the bestrnapproach to meet the schedule requirements. M&E designed a tertiary treatment facility at thernWCF and 12 miles of 18-inch ductile iron supply pipeline and 12-inch return pipeline for therncooling tower makeup and blow down and power plant wastewater discharge. The blow down isrnconveyed back to the WCF’s headworks for treatment. The facility is designed to supply thernpower plant’s cooling towers with an average flow of 2.5 mgd and peak flow of 4.3 mgd usingrnthree 450-horsepower pumps.rnThis paper provides a discussion of the project including an overview of the regulatory andrntechnical requirements that drove the overall design basis for the supplemental treatment facility,
机译：FPL Energy的罗得岛州能源合作伙伴LP（RISEP）已在罗得岛州约翰斯顿镇建造了一个540兆瓦的燃气循环联合循环发电厂。在该项目的开发阶段，已确定没有足够的饮用水和天然水来向电厂的冷却塔供应补充水。作为Asrna的结果，RISEP与附近的Cranston社区建立了工作合作伙伴关系，罗德岛（Rhode Island）使用该市废水控制设施（WCF）产生的二次废水，这些废水通常排入Pawtuxet河。rn在冷却塔中使用处理后的废水导致了罗德岛岛屿部空气资源管理办公室（RIDEM）颁发严格的许可证限制。许可证要求冷却塔供应补充水的总悬浮固体浓度（TSS）为5 mg / l或更低。另外，在电厂（距工厂12英里），要求冷却塔补充水的总残留氯（TRC）浓度不低于1 mg / l。为了满足这些要求，提出了一种过滤和化学进料系统，用于过滤废水中的颗粒物并使用次氯酸钠提供更好的消毒效果。这些过程被合并到位于Cranston WCF的三级处理设施中。 RISEP的激进时间表要求在三级设备的许可，设计，建造和启动中完成约18个月。选择设计-建造项目实施作为满足进度要求的最佳方法。 M＆E在rnWCF和12英里长的18英寸球墨铸铁供应管道和12英寸回流管道上设计了一个三级处理设施，用于冷却塔的补充和排污以及电厂废水的排放。排污被运回WCF的总部进行处理。该设施旨在使用三台450马力泵为发电厂的冷却塔提供平均流量2.5 mgd和峰值流量4.3 mgd.rn本文对项目进行了讨论，包括对推动总体设计的法规和技术要求的概述补充治疗设施的基础，

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