Journal
WATER AND ENVIRONMENT JOURNAL
Volume 29, Issue 4, Pages 558-565Publisher
WILEY-BLACKWELL
DOI: 10.1111/wej.12154
Keywords
domestic wastewater treatment; hydraulic retention time; organic loading rate; septic tank; up-flow anaerobic sludge blanket
Categories
Funding
- RenewableNepal Program [RENP-PID-924]
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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 degrees C to 30 degrees 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(63)% 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.
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