Nitrification, denitrification and biological phosphorus removal in piggery wastewater using a sequencing batch reactor.
Nutrients in piggery wastewater with high organic matter, nitrogen (N) and phosphorus (P) content were biologically removed in a sequencing batch reactor (SBR) with anaerobic, aerobic and anoxic stages. The SBR was operated with 3 cycles/day, temperature 30 degrees C, sludge retention time (SRT) 1 day and hydraulic retention time (HRT) 11 days. With a wastewater containing 1500 mg/l ammonium and 144 mg/l phosphate, a removal efficiency of 99.7% for nitrogen and 97.3% for phosphate was obtained. Experiments set up to evaluate the effect of temperature on the process showed that it should be run at temperatures higher than 16 degrees C to obtain good removals (> 95%). Batch tests (ammonia utilization rate, nitrogen utilization rate and oxygen utilization rate) proved to be good tools to evaluate heterotrophic and autotrophic biomass activity. The SBR proved to be a very flexible tool, and was particularly suitable for the treatment of piggery wastewater, characterized by high nutrient content and by frequent changes in composition and therefore affecting process conditions.
Obaja
D
D
Department of Chemical Engineering, University of Barcelona, Martí i Franquès, no 1, planta 6, 08028 Barcelona, Spain.
Macé
S
S
Costa
J
J
Sans
C
C
Mata-Alvarez
J
J
D000818:Animals; D019149:Bioreactors; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification* / Q000378:metabolism; D013552:Swine; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
D010758:Phosphorus; D009584:Nitrogen