IFAS Optimizes Use of Existing Infrastructure and Upgrades Performance
Yucaipa Valley Water District's Henry N. Wochholz WWTPYucaipa, California
IFAS process is a relatively new technology for controlling nitrogen discharges from wastewater treatment facilities in the United States. There is widespread interest in this technology, especially for retrofitting existing plants. Wochholz WWTP selected IFAS to expand its capacity from 15140 m3/d (4 mgd) to 30280 m3/d (8 mgd). To meet an annual effluent TIN limit of 6 mg/L, a post anoxic zone with methanol supplementation was provided in addition to a preanoxic zone and a 400% mixed liquor recycle stream. Performance data has shown that the plant can consistently achieve a TIN of less than 6 mg/L with methanol addition. Effluent ammonia has been below 0.5 mg/L and effluent nitrates below 4 mg/L with trace amounts of nitrites once the biology was stable. Methanol is added at the headworks due to lower than expected influent BOD. Methanol is also added at the post anoxic zones to polish effluent nitrates. By taking proper measures surface foaming in the IFAS basins has been controlled to less than an inch. Source: WEFTEC 2009 Proceedings
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Posted: August 27th, 2010 | Filed under: Waste Water Treatment | Tags: Environmental Impact, Increased Plant Capacity, Plant Optimization | No Comments »
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