A septic tank‐UASB combined system for domestic wastewater treatment: a pilot test. (14th October 2015)

• Record Type: Journal Article
• Authors: Lohani, Sunil P.; Bakke, Rune; Khanal, Sanjay N.
• Is Part Of: Water and environment journal. Volume 29:Number 4(2015)
• Page Start: 558
• Page End: 565
• Publication Date: 2015-10-14
• Subjects: domestic wastewater treatment -- hydraulic retention time -- organic loading rate -- septic tank -- up‐flow anaerobic sludge blanket; Sewage -- Periodicals; Water-supply -- Periodicals; Environmental management -- Periodicals; Water-supply engineering -- Periodicals; Pollution -- Periodicals; 628.1
• DOI: 10.1111/wej.12154
• Languages: English
• ISSNs: 1747-6585

Abstract

Abstract: A 250 L and a 550 L pilot scale Up‐Flow Anaerobic Sludge Blanket (UASB) reactors having different reactor height were fed septic tank effluents and operated at ambient temperatures of 0°C to 30°C. Both UASB reactors were fed intermittently at least 8 times per Hydraulic Retention Time (HRT) and the performance was monitored at 4d and 1d HRT. The removal efficiencies of Total Suspended Solid (TSS) and Total Chemical Oxygen Demand (CODt ) were about 59–68% and 54–59%, respectively, for both reactors at both HRT. The TSS and CODt removal efficiencies of Septic tank – UASB combined system were above 80% for both HRTs tested. The average biogas yields were almost same at 4d and 1d HRT, representing 31(±3)% of influent CODt. The nitrogen and phosphorous removal efficiency was an average 20–30%. The tested system can become a suitable low cost yet effective option.