title: Anaerobic treatment of domestic sewage in modified septic tanks at low temperature.
abstract: Three laboratory-scale septic tanks, an anaerobic baffled reactor (ABR)-septic tank (R1), a Yuhuan drawing three-dimensional-carrier-septic tank (R2) and a conventional septic tank (R3), were operated in parallel over half a year under hydraulic retention times (HRTs) of 36, 24 and 12 h, with a sewage temperature of 16 degrees C. The removal efficiencies of total chemical oxygen demand (CODtot) achieved in R1 and R2 increased by 14%, 21% and 12% and 18%, 3% and 16%, respectively, under three different HRTs, as compared to those in R3. The total nitrogen and phosphorus removal efficiencies were negligible. R1 sludges had a higher specific methane production rate as compared to that of R2 and R3 sludges. The results indicated that the two modified septic tanks can improve the performance in terms of COD and total solids removal, both were suitable technologies for domestic sewage (pre) treatment at low temperature in northern China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Qinxue
authors.initials: Q
authors.lastname: Wen
authors.forename: Huabin
authors.initials: H
authors.lastname: Guan
authors.forename: Rune
authors.initials: R
authors.lastname: Bakke
authors.forename: Nanqi
authors.initials: N
authors.lastname: Ren
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D006868:Hydrolysis; D008697:Methane; D012722:Sewage; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D008697:Methane