Jayadevan, Jeyabalasingham creator Harada, Hideki Chairperson Tanaka, Shuzo Examination committee Zhuang, Ya- Hui Examination committee Government of Finland Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1992 continuing eng 100 p. In order to establish guidelines for design and operation of thermophilic UASB process, a semi pilot scale modified Up flow Anaerobic Sludge Blanke~ (UASB) reactor ( 125 1) was used to treat the different industrial wastewater at a temperature of 55 C. At first a wastewater from distillery factory which has the BOD/COD ratio of 0.25 was used to evaluate the feasibility of the modified reactor. Jhe influent COD was maintained at 10,000 mg/l approximately. The loading rate of 19 kg COD/m .d already reached by Chen et al (Thesis no EV 91 - 20) was maintained for a pe1iod of further two months until the pseudo steady condition was reached 3 and maintained for a period of one month. Then the loading rate was increased to 27 kg COD/m .d by increasing the flow rate to 350 lid for further two months (HRT = 8.6 hrs). Pseudo steady condition could be maintained for more than three weeks. This shows the capability of treating this Distillery wastewater successfully tlyough anaerobic treatment at the thermophilic condition upto the loading rate of 27 Kg COD/m .d . Because of less removal efficiency (i.e. 30% in te1ms of COD) of distille1y wastewater due to its low biodegradability, another sample from Amino acid production which had the BOD/COD ratio of 0.43 was used to evaluate the reactor perfo1mance in terms of removal efficiency and loading rate. The Tapioca Starch wastewffiter from the Amino acid production which is used for the animal feed was started feeding from 25 December 1991. Initially influent strength of 5000 mf/l was introduced at a flow rate of 100 lid (HRT = 25 hrs). The loading rate was 4.6 kg COD/m d. Due to its inhibitory effect because of very high sulfate concentration of 5000 mg/l the influent strength was red~ced to 3000 mg/l maintaining the same HR T, but reduced organic loading rate to 2 .4 kg COD/m .d. The removal efficiency of 68% in terms of COD was achieved during the last phase. The 58% BOD removal efficiency in terms of total effluent BOD indicate the system is still acclimatizing for the new wastewater. So the feasibility of treating this wastewater can be predicted only after a few months of further experiment. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1992 Sewage Purification Biological treatment Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16840 http://203.159.5.9/ait-thesis/detail.php?q=B16840 170399 20260818133522.0