IFAS Optimizes Use of Existing Infrastructure and Upgrades Performance

Abstract

Small footprint technologies, such as the integrated fixed film activated sludge (IFAS) process, provide unique solutions for biological nutrient removal (BNR) facilities that face site constraints, expansion challenges, and/or the desire for a high quality effluent. The Yucaipa Valley Water District (YVWD) selected IFAS to expand the Henry N. Wochholz wastewater treatment plant (WWTP) capacity from 15140 m 3 /d (4 mgd) to 30280 m 3 /d (8 mgd) and to meet a total inorganic nitrogen (TIN) permit limit of 6 mg/L based on a 12-month average. The paper will discuss startup challenges with respect to the IFAS basins loading, media, aeration control as well as foaming issues. It will also provide information on current plant performance and operations.

The Second Generation of IFAS and MBBR: Lessons to Apply

“…Many of the first generation IFAS facilities have not had serious foam accumulation, with the exception of the Lakeview WWTP in Ontario, Canada; the TZ Osborne demonstration plant in Greensboro, North Carolina; and the Henry N. Wochholz WWTP in Yucaipa, California (Wallis-Lage et al, 2009). Incidences of foaming are typically associated with start-up conditions, when basins are under-loaded, or seeded with sludge that that has gone septic.…”