INVESTIGATION OF INDUSTRIAL WASTEWATER MANAGEMENT CONDITION BASED ON WASTEWATER ORGANIC POLLUTION LOADS AND TREATMENT FACILITIES IN THE INDUSTRIAL DISTRICT OF WEST TEHRAN

Industrial wastewater characteristics were investigated using questionnaire of Environmental Protection Organization of Iran, visiting industrial factories and interviewing. Industries and mining organization data base of all industries were classified in ten categories. Number of industries with greater than 50 staff in industry in this region was 283; fifty industries were selected with classified weighted sampling method for this study.

The average wastewater flow rate generated by these 50 industries was 9422 m3/day, with an average volume of wastewater generated per capita found to be about e 437 liters per day. Minimum organic loading was related to non-metallic mineral industries with COD of 205 mg/L and BOD of 85 mg/L. maximum COD was related to paper industries with a rate of 8800 mg/L and maximum BOD was recorded at food and drug industries with rate of 1536 mg/L.

All of these 10 categories of industries were scored based on generated COD, BOD loading and wastewater load per capita from 1 (minimum) to10 (maximum) and then were ranked from most polluting to least polluting industry. In this study, paper industries with overall score of 28 in three aforementioned parameters were major source of pollution in the industrial district of west Tehran. On the other hand non metallic industry with the overall score of 5 was found to be the least polluting industry.