Intermittent high-pressure sequential bioreactor (IHPSB) with integration of sand filtration system for synthetic wastewater treatment.
A pressurized activated sludge reactor with a sand layer installed at the bottom of the reactor for filtration purposes was employed for treating synthetic organic wastewater. The intermittent high-pressure sequential bioreactor (IHPSB) was pressurized to facilitate efficient oxygen transfer under elevated biomass conditions with pressure released periodically, i.e. aeration, for mixing and exchanging air. The sand layer integrated in the bottom of reactor was employed to separate sludge from treated water during the effluent discharging period. The results show that the proposed system can achieve chemical oxygen demand (COD) removal of higher than 90% under COD loading ranging from 3.3 to 14.3 kg COD/m3/day. SS of the effluent is quite stable and is less than 30 mg/L when MLSS is less than 18,000 mg/L. Oxygen transfer in the IHPSB is quite effective. Dissolved oxygen (DO) ranging from 16 to 10 mg/L was achieved with aeration cycle varying from 3 to 15 min. Thus, IHPSB can be quite energy efficient compared with traditional aerobic activated biological systems and membrane biological reactor systems.
Department of Water Resources and Environmental Engineering, TamKang University 151 Ying-Chuan Road, Tamsui district 25137, New Taipei city, Taiwan.
Yang-Min
YM
Liang
Chi-Wang
CW
Li
Po-Ching
PC
Lee
Tai-Wei
TW
Tzeng
Shiao-Shing
SS
Chen
D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005374:Filtration / Q000295:instrumentation*; D011312:Pressure; D012722:Sewage; D012822:Silicon Dioxide; D018505:Waste Management / Q000295:instrumentation*
D012722:Sewage; D012822:Silicon Dioxide