Saheb-Gharanieh wastewater treatment plant located in the northern part of Tehran, Iran, was selected as a pilot. The quality and quantity of wastewater of the plant were investigated for a perid of one year. The main aim of the present investigation was to determine the design criteria for the construction of the municipal wastewater treatment plant in Tehran. The population being served by the plant was twice surveyed, in the beginning and at the end of the investigation period, in order to find out the amount of wastewater pollutants and flow generated per person. Based on this research, average population being served by the plant was about 2,300 during the study, which was 0.033% of total population of Tehran (6.8 million according to national census in 1996).
The results obtained in this study, which at least may be used as design criteria for wastewater treatment plant construction in the north of Tehran, are summarized below:
- The mean per capita wastewater flow was 275 liter per day.
- The average of hourly maximum factor of wastewater flow rate was
1.56 (ratio of the average of maximum hourly wastewater flow to the daily average of the wastewater flow over one year period of the study).
- Maximum hourly factor of wastewater flow rate was 5.2 (ratio of the maximum hourly wastewater flow to the daily average wastewater flow over one year period of the study).
- The average of hourly minimum factor of wastewater flow rate was 0.28 (ratio of the average of minimum hourly wastewater flow rate to the daily average wastewater flow over one year period of the study).
- Minimum hourly factor of wastewater flow rate was 0.16 (rate of the minimum hourly wastewater flow rate to the daily wastewater flow rate over one year period of the study).
- The average amount of wastewater pollutants including COD, BOD5, SS, VSS, TKN, and phosphate-P in Saheb-Gharanieh district were 65.5, 36, 50, 38, 10.5, and 0.8 gram per capita per day respectively.
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