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The Samuel S. Baxter Water Treatment Plant is the largest drinkingwater facility in the City of Philadelphia, Pennsylvania, with an average annual finished water effluent of 175 million gallons per day. In 1998, the plant began a half-plant trial to achieve coagulant optimization and improved total organic carbon (TOC) removal while maintaining finished water turbidities below 0.10 NTU. Baxter personnel continue to look at many tools to optimize their treatment processes while keeping a watchful eye on the cost of drinking water to the consumer. The streaming current monitor (SCD) is one such on-line instrument that can be helpful in optimizing the coagulant dosage. The Baxter Plant purchasedan SCD to monitor the effectiveness of its coagulant dose on a real-time basis. This paper will examine the usefulness of the SCD under both sweep flocculation and charge neutralization. The paper will present the data from the SCD under a variety of operating conditions over several seasons and storm events to determine its effectiveness in coagulant optimization for both treatment strategies. Additional information will be presented on the installation, calibration, and maintenance of the SCD from an operational perspective. Includes figures.

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Edition: Vol. - No. Published: 01/01/2000 Number of Pages: 15File Size: 1 file , 240 KB