Anaerobic treatability and biogas production potential of pistachio processing wastewater with upflow anaerobic sludge blanket (uasb) reactor

Gür, Eray
Agro-industrial wastes cannot be treated in conventional wastewater treatment plants due to high organic contents. However, they have a high potential as renewable energy resources, and can be converted into valuable end products via application of appropriate treatment technologies. Anaerobic digestion (AD) is a process which converts organic materials into methane and carbon dioxide in the absence of oxygen. Therefore, wellestablished anaerobic biotechnologies, such as up-flow anaerobic sludge blanket (UASB) reactors, have been widely adopted worldwide as a tool for not only treatment but also valorization of agro-industrial wastes. In Turkey, 130000 tons of pistachio and 520000 tons of pistachio processing wastewater are produced annually. However, academic studies on anaerobic treatability of pistachio are limited. The aim of this thesis is determination of the efficiency of AD process for the treatment of pistachio processing wastewaters, a local agro-industrial waste, and production of biogas as surplus renewable energy source during the treatment process. To this purpose: (1) anaerobic treatment of the pistachio processing wastewater originated from peeling process of outer fresh husk of pistachio in an UASB reactor; and (2) determination of the biogas production during anaerobic treatment process were conducted. Average COD removal efficiencies of four UASB reactors were varying from 73.8 % to 86.74 %. Maximum COD removal efficiency observed in reactor UASB3 as 95.4 %. Average methane yields observed in reactors ranged in between 154 – 305.49 ml CH4/g CODreduced. The results revealed that pistachio wastewater can be treated with UASB and biogas can be produced.


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Citation Formats
E. Gür, “Anaerobic treatability and biogas production potential of pistachio processing wastewater with upflow anaerobic sludge blanket (uasb) reactor,” M.S. - Master of Science, Middle East Technical University, 2016.