Application of aerobic granular sludge in polishing the UASB effluent.
Stable aerobic granules were successfully developed in a sequencing batch reactor (SBR) fed with glucose and sodium acetate as the main carbon sources, and then they were acclimatized to polish the effluent from an up-flow anaerobic sludge blanket (UASB) reactor. It was found that more than 95% chemical oxygen demand (COD) and 85% suspended solids (SS) in the UASB effluent could be removed by an aerobic granular SBR as a post treatment unit. The performance of the SBR was stable over the whole experimental period. At an organic loading rate (OLR) of 4.5 to 5.4 g l(-1) d(-1), the acclimatized aerobic granules had an average diameter of 3.5 to 6.0 mm and a minimal settling velocity of 72 m h(-1). The biomass concentration in the SBR was as high as 8.4 g (dry weight) l(-1). This study showed for the first time that aerobic granular sludge in SBR would be an effective means to polish the effluent from UASB reactor.
Zhang
L L
LL
School of Environmental Science and Engineering, Shanghai Jiaotong University, People's Republic China.
Zhang
B
B
Huang
Y F
YF
Cai
W M
WM
D000332:Aerobiosis; D019149:Bioreactors; D008855:Microscopy, Electron, Scanning; D009930:Organic Chemicals / Q000378:metabolism; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D010316:Particle Size; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D009930:Organic Chemicals; D012722:Sewage; D010100:Oxygen