Characteristics, treatments, and management for disposal of sanitary wastewater in South Pars Gas processing plants

• Identify the problems of current activated sludge process.
• High foaming was caused in sanitary treatment unit by excessive use of detergents.
• Injection of hydrogen peroxide improves the efficiency of activated sludge process.
• Use of packing improves the performance of aeration tank.

Improper or inadequate treatment, handling, and disposal of sanitary wastewater can have far reaching impacts on the environment. These impacts are the reasons for management and regulation of South Pars Gas processing plants. Foaming, high suspended solids, high biodegradable material and low pH are the main causes of pollution problems in the sanitary wastewater treatment (activated sludge process) of a gas processing plant. Recent inspection of the sanitary treatment package showed that significant foaming has occurred in inlet Sump and aeration Tank of the unit as well as increasing BOD (biochemical oxygen demand) of effluent stream. The object of the present investigation is (a) to focus on the performance assessment of activated sludge process and potential reasons of pollution that have been gained from observations and laboratory results in South Pars Gas processing plant (b) to discuss the effects of these reasons on the specification of effluent wastewater, (c) to analyze operational management and modification of current activated sludge system and (d) from the results suggest some techniques for pollution control in the plant.