Struvite deposition is a common problem in municipal wastewater treatment plants and can be significant if not anticipated, but struvite deposits are completely manageable if properly addressed. This paper summarises experiences from a number of facilities that have dealt successfully with struvite problems, elaborates on the interrelations between secondary treatment and anaerobic digestion, and outlines an approach to control struvite and available alternatives.
The ever-expanding worldwide application of biological nutrient removal (BNR) technology is generating a greater appreciation for the performance of BNR processes under different operating conditions. This paper examines the effects of high process temperature on the biological phosphorus and nitrogen removal mechanisms and the sludge settling properties in BNR activated sludge processes. These effects are illustrated with data from three full-scale BNR facilities in which enhanced biological phosphorus removal (EBPR) failed, but nitrification and denitrification were maintained at mixed liquor temperatures of approximately 30°C.
Spokane River dischargers face restrictive phosphorus discharge limits that are technically challenging. A tertiary phosphorus removal pilot at the wastewater treatment plant was conducted between June and October 2006. Technologies from four different manufacturers were tested on their ability to reliably produce effluent total phosphorus (TP) concentrations of less than 50 µg/L and less then 10 µg/L. The demonstration pilot showed that effluent total phosphorus concentration of less than 50 µg/L can be produced by at least two of the tested technologies, Blue Water Technologies Blue Pro (DSBP) and Siemens Trident ® HS-1 (THS-1). While not fully demonstrated, GE (Zenon) ultrafiltration (ZW-500) and Parkson Incorporation Dual Sand (DSD2) would also likely be able to meet 50 µg/L. None of them showed ability to meet a 10 µg/L TP limit. While there were a number of days with 10 µg/L or less, they were few and far between.
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