A reformed SBR technology integrated with two-step feeding and low-intensity aeration for swine wastewater treatment.
Wastewater from animal farms in China is threatening the quality and security of the local water environment. A traditional sequencing batch reactor (SBR) and a reformed SBR integrated with two-step feeding and low-intensity aeration at laboratory scale were investigated in this study for biological removal of nutrients and organic matter from swine wastewater. A low efficiency and poor stability were found under the traditional SBR, and the reduction of total nitrogen (TN), total phosphorus (TP) and biochemical oxygen demand (BOD5) reached 89.1, 86.0 and 93.9%, respectively. When the wastewater was treated with the reformed SBR under the running cycle of anaerobic/anoxic-anaerobic/anoxic process, the reductions in TN, TP, and BOD5 reached a maximum of 94.0, 99.3 and 99.9%, respectively. The curves of oxidation reduction potential (ORP) and nutrients over time during operation of the reformed SBR could reflect the activity of denitrifying phosphorus-accumulating organisms (DNPAOs).
Lu
Liang
L
Research Center of Eco-environmental Sciences, ZheJiang University, HangZhou, P.R. China.
Zhang
Shuai
S
Li
Hui
H
Wang
Zhaode
Z
Li
Jinjin
J
Zhang
Zhijian
Z
Zhu
Jun
J
D000383:Agriculture; D000818:Animals; D000829:Animals, Domestic; D019149:Bioreactors; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D008372:Manure; D009584:Nitrogen / Q000378:metabolism; D010101:Oxygen Consumption; D010758:Phosphorus / Q000378:metabolism; D034421:Sus scrofa; D014865:Waste Disposal, Fluid / Q000379:methods*; D014881:Water Supply / Q000032:analysis
D008372:Manure; D010758:Phosphorus; D009584:Nitrogen