Treatment of artificial soybean wastewater anaerobic effluent in a continuous aerobic-anaerobic coupled (CAAC) process with excess sludge reduction.
In this study, treatment of artificial soybean wastewater anaerobic effluent was studied in a continuous aerobic-anaerobic coupled (CAAC) process. The focus was on COD and nitrogen removal as well as excess sludge reduction. During the continuous operation without reflux, the COD removal efficiency was 96.5% at the optimal hydraulic retention time (HRT) 1.3 days. When HRT was shortened to 1.0 day, reflux from anaerobic zone to moving bed biofilm reactor (MBBR) was introduced. The removal efficiencies of COD and TN were 94.4% and 76.0% at the optimal reflux ratio 30%, respectively. The sludge yield coefficient of CAAC was 0.1738, the simultaneous removal of COD and nitrogen with in situ sludge reduction could be achieved in this CAAC process. The sludge reduction mechanism was discussed by soluble components variation along the water flow.
Department of Biological Engineering, School of Life Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China.
Jun
J
Wang
Xiaoxia
X
Li
Weichao
W
Fu
Shihan
S
Wu
Chun
C
Li
D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000201:enzymology; D001426:Bacterial Proteins / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D009584:Nitrogen / Q000302:isolation & purification; D010447:Peptide Hydrolases / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis; D012212:Rheology; D012722:Sewage / Q000382:microbiology*; D012995:Solubility; D013025:Glycine max / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
D001426:Bacterial Proteins; D009584:Nitrogen; D010447:Peptide Hydrolases; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater