Single-sludge biological treatment systems for nitrification-denitrification and phosphorus removal have become widely accepted process options due to the increasingly greater demand for effluent nutrient control. The Soreq Biological Treatment Plant is a regional facility for municipal wastewater treatment and effluent reclamation for irrigation purposes, with a current average capacity of 220,000 m3/day. The performance data presented for one full year of operation (1989-1990) under automatic process control indicate consistently high rates of carbon oxidation, nitrification-denitrification and enhanced phosphorus removal.

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