Wastewater Treatment Plant Design and Rehabilitation

Regional Treatment Plant Hydraulic Improvements

PECI serving as a subconsultant to another firm, 负责确定需要的水力泄压改进，以使这个152 mgd的区域工厂能够更好地将12个二级澄清池的流量分配到32个低水头污水过滤器, 其中一些被放弃，而另一些则通过布媒体改造获得了重大的能力升级. Two relief tunnels were identified and designed. 第一个工程涉及一条相对较短但复杂的84英寸减压隧道，将两个分离的澄清池的污水槽连接起来. This pipeline was partially installed by open cut, but due to electrical duct banks and other large utilities in the vicinity, specific portions had to be installed by tunneling in tight, confined operating plant areas and beneath roadways.

Plant Rehabilitation

PECI has designed multiple improvements to a 10 MGD plant serving two cities in north Texas. PECI为进水升降机站指定了一套带有有机介质的生物气味控制系统(生物洗涤器). 这使得业主可以减少位于固体处理大楼的现有化学洗涤器的使用，并导致大量的化学和能源成本. To reduce corrosion in the existing electrical room, PECI specified a positive pressurization unit to pressurize the room with scrubbed air. 此外，PECI用新的散装储罐重新设计了现有的化学储存区，以容纳满载的氢氧化钠和次氯酸钠.

Primary and Secondary Clarifier Rehabilitation

PECI担任主要顾问，负责为德克萨斯州北部多个城市服务的48mgd区域废水系统中的四个大型主澄清池和四个二级澄清池进行主要腐蚀修复的设计. The project involved assessment and repair of corrosion damage to concrete structures, rehabilitation of four 135-foot aluminum low-profile basin covers, weir and baffle replacements and skimming system rehabilitation. 还包括对主澄清池洗涤和通风系统有效性的评估.

Blower and Aeration System Upgrade

PECI担任主要设计顾问，协助德克萨斯州北部一个主要城市更新其24 MGD污水处理厂的活性污泥工艺. The project included installation of new high speed turbo aeration blowers, air piping, and fine bubble membrane diffusers. The existing aeration system included four multistage centrifugal blowers. The project was placed in service at a cost of $2.6 million.

Snail Collection and Slurry Pumping System

As part of a larger plant rehabilitation project, PECI designed a special settling basin to capture snails from a trickling filter process. 设计了一个泵送系统，将蜗牛装载的泥浆移动到分类器中，这样蜗牛就可以存放在滚装容器中，以便运离现场. The project significantly reduced snail accumulation in downstream basins.

Screen and Conveyor System Replacement

PECI协助加兰德市更换了该市24 mgd罗利特河污水处理厂头厂大楼的筛选和输送设备. Equipment installation was performed by City personnel.

Plant-Wide Rehabilitation Improvements

PECI被委托评估和优先考虑整个24 MGD污水处理厂的修复需求，该处理厂服务于多个城市. The treatment facilities had been constructed and expanded under numerous contracts, with many facilities over 40 years of age. Corrosion and structural deterioration was a concern in a number of areas.

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PECI在两个建设项目中担任主要顾问，负责最优先的改进项目的详细设计.  这些项目包括对工厂内一些覆盖的混凝土结构进行广泛的腐蚀修复, drainage improvements inside the plant’s dewatering building, addition of a 5,000 CFM bioscrubber for odor control, replacement of the plant’s aging return and waste activated sludge piping and distribution system, rehabilitation of approximately 3,500 square yards of in-plant paving surfaces, and addition of access and security improvements. Full-span truss supported aluminum covers were added to the plant's primary clarifiers, screens were replaced, and major electrical gear was rehabilitated.

Plant Rehabilitation Needs Assessment

PECI担任主要顾问，负责对这个152mgd的区域污水处理设施进行全厂范围的评估和修复需求的优先排序. The effort included review of the age, criticality, and condition of dozens of major process units, along with development of projected costs for rehabilitation. Coordination with multiple consultant teams was required. 评价确定了建议在6至10年内总计约6 000万美元的厂内修复.

Wastewater Treatment Plant Domes and Mixing System Addition

Perkins Engineering Consultants, Inc. 协助谢尔曼市增加了圆顶，以覆盖三个90英尺高的最终澄清池，用于控制藻类. 该项目还包括为工厂的潮湿天气储存设施增加一个喷射混合系统. The project was placed in service at a cost of $1.4 million.