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Determination of design criteria for UASB reactors as a wastewaterpretreatment system in tropical small communities



A pilot scale study was set up to investigate the principle design parameters of up flow anaerobic sludgeblanket (UASB) reactors for treating wastewater of small communities in the tropical regions of Iran. A steelpipe with a diameter of 600 mm and a height of 3.6 m was used as the reactor in which a digestion and a 3-phaseseparator element had a volume of 0.848 and 0.17 m3 respectively. During this study, which lasted for 203 days,two distinct phases were carried out according to the ambient temperature. The temperature of the wastewater entering the reactor was naturally ranged from 22 to 26 0C and no heat exchanger was used. The hydraulicretention times including 2, 4, 6, 8, and 10 hours with various loading rates of 0.95 to 5.70 kg COD/m3/day forcolder period and from 1.35 to 6.40 kg COD/m3/day for warmer period were examined. On the basis of theresults the optimal hydraulic retention time for warmer period with a 2.20 kg COD/m3/day organic loading ratewas 6 hours which BOD5, COD and TSS removal efficiency were 71, 63 and 65 percent respectively. During thecolder period the removal ratio of BOD5, COD and TSS with an optimal hydraulic retention time of 8 hours andorganic loading rate of 1.22 kg COD/m3/day were 54, 46 and 53 percent respectively.

کلیدواژه ها:

UASB reactor ، HRT ، small communities ، wastewater pretreatment ، tropical regions

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