Anaerobic processes are widely popular in the treatment of a variety of industrial wastewaters since the development of such high rate treatment processes like upflow anaerobic sludge blanket (UASB),~(1-2) anaerobic filter~3, and the fluidized-bed process. Although problems related to slow start-up and microbial sulfate reduction exist, generation of a nonconventional energy source in the form of biogas automatically makes anaerobic treatment the best choice for a developing country like Thailand. Statistics show an estimated energy savings of 2800 * 10~6 kWh/anum from conventional aerobic treatment and an additional energy production of 2300 * 10~6 m~3 biogas/anum from industrial wastewaters in Thailand, indicating a great potential for anaerobic treatment.~4
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