In the past decade has been research activity in the application of anaerobic reactor technology for treatment of various types of industrial wastewaters, such as those from food processing textile industry, paper and pulp industry. Anaerobic aigestion consists of several interdependent, complex sequential and parallel biological reactions, during which the products from one group of microorganisms serve as the substrates for the next, resulting in transformation of organic matter mainly into a mixture of methane and carbon dioxide. Anaerobic gestion takes place in four phases: hydrolysis/liquefaction, acidogenesis, acetogenesis and methanogenesis. To ensure a balanced digestion process, it is important that the various biological conversion processes remain sufficiently coupled during the process so as to avoid the accumulation of any intermediates in the system. There are different anaerobic reactors such as the Up flow Anaerobic Sludge Blanket (UASB) and the Anaerobic Sequencing Batch Reactor (ASBR) which have been used mainly for industrial wastewater treatment.