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A theoretical and practical evaluation of struvite control and recovery
Robert Sharp1, Enrique Vadiveloo, Robert Fergen
1Department of Civil and Environmental Engineering, Manhattan College, 3825 Corlear Avenue, Leo Hall Room 309, Bronx, N.Y. 10463, USA. Robert.sharp@manhattan.edu
Abstract:
Struvite accumulation is a costly problem in many water resource recovery facilities (WRRFs) that use anaerobic digestion, causing significant labor and equipment costs and potentially impacting facility performance and permit compliance. A comprehensive study was undertaken to evaluate possible solutions to struvite control at two similar Miami-Dade County, Florida, WRRFs. Alternatives analyzed included periodic cleaning and repair of damaged piping and equipment; optimum ferric salt dosing, use of in situ scaling coupons; and engineered struvite precipitation. The effectiveness and cost of each alternative was evaluated using a newly constructed dynamic process model and a net present worth analysis. Results indicate that nutrient recovery was a potential benefit at both facilities. This study establishes a comprehensive process and specific testing protocols for evaluating struvite control alternatives.
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