| Abstract: |
The purpose of this study is to investigate the domestic wastewater treatment bythe upflow anaerobic sludge blanket (UASB) process. Two different types of reactorshave been used. The experiment involves operation of two-pilot-scale UASB reactors inparallel treating raw domestic wastewater from the city of Murfreesboro, Tennessee(USA).The reference reactor was named ”(R)”, and the reactor including distribution,media and baffles was named ”(B)”.The research focuses, in phase1, on the effectiveness of distribution of influentwastewater in the bottom of the UASB reactor (B), and adding baffles to deflect gas to. the gas-cap opening. In phase 2, the research focuses in increasing the depth of mediaon the top part ofUASB reactor (B) from 3.8 cm to 38 cm. Also the research makes acomparison between reactor (R) and reactor (B) in both phases for efficiency ofwastewater treatment.The parameters used are divided into the control parameters which havehydraulic retention time (HRT), organic loading rate (OLR), and temperature (T), andthe main operational parameters, including influent and effluent chemical oxygendemand (COD) and biochemical oxygen demand concentrations (BOD), which havesludge retention time (SRT), pH, total suspended solid (TSS), and volatile suspendedsolid (VSS). These parameters affect the UASB loading potentials and its resultingperformance during acclimationl start up and stabilization for the different phases.In reactor (B) removal of COD, BOD, TSS, and VSS is about 5-8 % more thanrector (R), in Phase (1). But in Phase (2) the percent removal of COD, BOD, TSS andVSS had increased by about 8-12 % after reactor (B) modification.
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