title: Load limit of a UASB fed septic tank-treated domestic wastewater.
abstract: Performance of a 250 L pilot-scale up-flow anaerobic sludge blanket (UASB) reactor, operated at ambient temperatures, fed septic tank effluents intermittently, was monitored for hydraulic retention time (HRT) from 18 h to 4 h. The total suspended solids (TSS), total chemical oxygen demand (CODT), dissolved chemical oxygen demand (CODdis) and suspended chemical oxygen demand (CODss) removal efficiencies ranged from 20 to 63%, 15 to 56%, 8 to 35% and 22 to 72%, respectively, for the HRT range tested. Above 60% TSS and 47% CODT removal were obtained in the combined septic tank and UASB process. The process established stable UASB treatment at HRT≥6 h, indicating a hydraulic load design limit. The tested septic tank-UASB combined system can be a low-cost and effective on-site sanitation solution.
authors.affiliation: Kathmandu University, Dhulikhel, Nepal E-mail: splohani@ku.edu.np.
authors.forename: Sunil Prasad
authors.initials: SP
authors.lastname: Lohani
authors.affiliation: Telemark University College, Porsgrunn, Norway.
authors.forename: Rune
authors.initials: R
authors.lastname: Bakke
authors.affiliation: Kathmandu University, Dhulikhel, Nepal E-mail: splohani@ku.edu.np.
authors.forename: Sanjay N
authors.initials: SN
authors.lastname: Khanal
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000706:statistics & numerical data*; D010865:Pilot Projects; D012722:Sewage; D018505:Waste Management / Q000706:statistics & numerical data*; D062065:Wastewater / Q000706:statistics & numerical data*
chemical_list: D012722:Sewage; D062065:Wastewater