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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/237

Title: Biological organic matter and nutrient removal from textile wastewater using anaerobic-aerobic bioprocess
Authors: RAHEL, MUCHE
Advisors: Dr.Seyoum Leta
Dr. Amare Gessese
Copyright: 2007
Date Added: 13-Nov-2007
Publisher: Addis Ababa University
Abstract: Textile industry is faced with serious environmental problems associated with its immense wastewater discharge, substantial organic load, extreme alkalinity and heavily colored effluent. The overall objective of this study was to evaluate the treatment performance of pilot anaerobic/ aerobic treatment bioprocess for the removal of organic matter from textile wastewater. This was fed with raw textile wastewater obtained from Awassa Textile factory. The system was inoculated with sludge biomass prepared using sediment slurry samples from alkaline soda lake, Chitu. The performance of the system was evaluated using COD, BOD5, TN, NH4+-N, NO3-N, SO4 2-, S2-, PO4 3 - and pH concentrations. Color removal was monitored using spectral analysis of the influent and effluent samples. The system was operated at four different organic loading rates (OLR) (1.8, 1.5, 1.0 and 0.5 Kg/ m3day). Results indicated that the system was able to achieve 86.8, 90.3, 91.5 and 88.47 % removal of COD and 87.1, 90.11, 92, and 87.08 % removal of BOD5 at 1.8, 1.5, 1.0 and 0.5 Kg/m3day of OLRs, respectively. In addition, TN removal efficiencies were also found to vary from 58.2, 60, 62 and 53.2 % at 1.8, 1.5, 1.0 and 0.5 Kg/m3day of OLRs, respectively. Maximum removal efficiencies were recorded at the third experimental feed (OLR of 1.0 Kg/m3.day) where COD, BOD5 and TN concentrations decreased from 3140, 957 and 41.33 mg/l to nearly 264, 76, 15.7mg/l, respectively. The increased removal efficiency was found to be highly related to the increase in biomass of the system. The significance of the anaerobic period was apparent in COD removal and more than about 70% of COD was removed in anaerobic phase. The UV-Visible spectrum of influents and effluents showed remarkable changes confirming the changes in structure of parent dyes. The ammonium nitrogen concentration was increased following anaerobic treatment and reduced after the aerobic basin. The variations in the concentration of ammonium nitrogen after anaerobic treatment and in the effluent together with the shift in spectral analysis provide an indirect evidence of the biodegradation of dye components in the wastewater. The results of this study showed the potential application of the system using alkaline sludge biomass for the treatment of dye containing textile wastewater.
Description: M.Sc Thesis. Addis Ababa University, Addis Ababa, Ethiopia.
URI: http://hdl.handle.net/123456789/237
Appears in:Thesis - Environmental Sciences

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