[Effect of nutrient on sludge settling property and bulking controls].
The effect of nutrient (N and P) deficiency on activated sludge settleability and characteristics of activated sludge flocs in Sequencing Batch Reactor (SBR) fed with brewery wastewater were investigated. The results showed that the activated sludge had good settling properties at influent BOD5/N/P was 100/5/1,100/5/0.8 and 100/4/0.8 respectively. When BOD5/N/P was 100/0.94/0.31,100/2/0.4,100/3/0.6 respectively, the sludge settleability became worse due to excessive growth of filamentous. When BOD5/N/P was 100/0.94/1,100/5/0.31,100/5/0.4,100/5/0.6 respectively, non-filamentous activated sludge bulking occurred. Adding sufficient nutrient to the influent, the sludge bulking was controlled effectively and the low SVI was recovered. When increasing COD loading rate, the duration of recovery could be diminished. When nitrogen and phosphorus were insufficient synchronously, aerobic granular sludge was formed which was averagely 2mm-6mm in diameter.
Chen
Ying
Y
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China.
Peng
Yong-zhen
YZ
Liu
Min
M
Wang
Shu-ying
SY
Liang
Xiu-rong
XR
Gao
Chun-di
CD
D001420:Bacteria, Aerobic / Q000378:metabolism*; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods
D012722:Sewage; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen