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.
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Research Article| July 14 2015
Load limit of a UASB fed septic tank-treated domestic wastewater
Sunil Prasad Lohani;
Sunil Prasad Lohani, Rune Bakke, Sanjay N. Khanal; Load limit of a UASB fed septic tank-treated domestic wastewater. Water Sci Technol 1 October 2015; 72 (8): 1455–1461. doi: https://doi.org/10.2166/wst.2015.358
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