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Evaluation of a Treatment System for High-strength Bod and Suspended Solids Removal

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The SCA Tissue, LLP's Flagstaff Mill (SCA) in Flagstaff, Arizona, is a 100 percent recycled paper mill, currently processing approximately 60,000 tons of paper per year. The mill has been operating an activated sludge plant with high organic loading and fluctuating flows. The treatment facility has been able to meet the wastewater discharge permit requirements imposed by the City of Flagstaff. However, process upset conditions occasionally occur and maintenance cost for corrective action becomes necessary, which the Mill desires to minimize. URS Corporation was retained by SCA to evaluate the operational alternatives to improve system performance. One feature of the upgrade focuses on the avoidance of sewer discharge cost and raw water supply savings to offset the costs of the upgrade. Objectives established in the present study include checking the existing system operational parameters against the design capacity and performance and consistency, characterizing the operation, identifying the key deficiencies in existing biological process and engineering design, and developing alternatives. Evaluation criteria of alternatives include effectiveness, implementation, and cost of the upgrade. Life cycle cost analysis was used to identify the lowest cost alternative in terms of present worth. Membrane biological reactor technology was chosen as the minimum effective design, i. e., the most cost-effective solution that achieves the project goal.
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Keywords: ACTIVATED SLUDGE; DESIGN PARAMETERS; LIFE-CYCLE COST ANALYSIS; MEMBRANE BIOLOGICAL REACTOR

Document Type: Research Article

Publication date: 2007-10-01

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