Anaerobic biological treatment of industrial wastewater is becoming more relevent because of potential cost advantages ans space requirements over historically applied aerobic biological systems. Anaerobic fixed film reactor have been developed to mantain large active anaeroibic population attaced to suitable contact media biological reactor. Performance of data related to pH has been discussed. This book gives study on vegetable oil refinery wastewater. the results of this study should help environmentalist to find out the solution for practical problems and shall be useful to the professionals in the field of Environmental engineering and pollution control.