A pilot study on a step-feeding anoxic/oxic activated sludge system.
A four stage pilot plant of step-feed biological nutrient removal (BNR) was employed to investigate reactor performance and process stability. The results obtained showed that step-feed BNR is efficient and cost-effective for nitrogen and carbonaceous removal from municipal wastewater. The total average removal efficiencies of COD, NH3-N, TN and TP could reach as high as 89.5, 97.8, 73 and 75%, respectively, with 50% of return activated sludge (RAS), 9 h of hydraulic retention time (HRT) and 20 d of sludge retention time (SRT). Step-feed BNR is an alternative and effective technology of nutrient removal for municipal wastewater treatment.
Sheping
Wang
W
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
Lifang
Yu
Y
Guanghui
Han
H
Hairong
Zhu
Z
Dangcong
Peng
P
D000332:Aerobiosis; D000693:Anaerobiosis; D009584:Nitrogen / Q000032:analysis*; D010865:Pilot Projects; D012722:Sewage / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen