الفهرس | Only 14 pages are availabe for public view |
Abstract The purpose of this study is to investigate the domestic wastewater treatment by the upflow anaerobic sludge blanket (UASB) process. Two different types of reactors have been used. The experiment involves operation of two-pilot-scale UASB reactors in parallel 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 influent wastewater 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 media on the top part ofUASB reactor (B) from 3.8 cm to 38 cm. Also the research makes a comparison between reactor (R) and reactor (B) in both phases for efficiency of wastewater treatment. The parameters used are divided into the control parameters which have hydraulic retention time (HRT), organic loading rate (OLR), and temperature (T), and the main operational parameters, including influent and effluent chemical oxygen demand (COD) and biochemical oxygen demand concentrations (BOD), which have sludge retention time (SRT), pH, total suspended solid (TSS), and volatile suspended solid (VSS). These parameters affect the UASB loading potentials and its resulting performance 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 than rector (R), in Phase (1). But in Phase (2) the percent removal of COD, BOD, TSS and VSS had increased by about 8-12 % after reactor (B) modification. |