Abstract
A wastewater treatment plant is designed to daily treat 450000 m3 of wastewater collected from the city of Tehran. The wastewater treatment plant is located at the south of Shahr-Ray in southern Tehran with the area of 110 hectares. The treatment plant effluent will be transferred to Varamin agricultural lands to be used for the irrigation of crops. A conventional activated sludge for carbon removal and a high-rate trickling filter for nitrification of ammonia to nitrate are designed and constructed. The treatment plant consists of inlet pumping station, primary treatment, primary sedimentation tanks, selector and aeration tanks, trickling filter, and sludge treatment units. A mass balance analysis method which is a new approach for optimum design is used to achieve cost saving for the construction of south Tehran wastewater treatment plant. The comparison between combined system of activated sludge with trickling filter and an activated sludge alone shows that the combined system is 20% less costly and more efficient for the treatment of Tehran wastewater, the system has low volume demand, maximum biogas yeild, and low process control and is less variable to pH and chemical effects and highly energy-efficient.
Highlights
IntroductionDue to various socioeconomic factors, the process of urbanization continues and becomes faster with the passage of time
The city of Tehran is one of the fastest growing metropolitan cities in Iran
Due to various socioeconomic factors, the process of urbanization continues and becomes faster with the passage of time. Such and similar reasons aggravate the stress on civic amenities like water supply, sanitation, dwelling, transport, and health care facilities
Summary
Due to various socioeconomic factors, the process of urbanization continues and becomes faster with the passage of time. Such and similar reasons aggravate the stress on civic amenities like water supply, sanitation, dwelling, transport, and health care facilities. Even the most developed countries have not been able to achieve 100 percent results. Such facilities are costly in terms of capital outlay and beyond the affordability of smaller communities in meeting operation and maintenance costs, but if no facility is provided, health hazards will overtake communities with various communicable diseases
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