South-East Teheran Sewerage Plant as a Water Resource for Agricultural Activities across Varamin Lands

Sewer facilities are urban necessities not only in the improvement, but also in the preservation of water quality and in protection from inundation. Indeed, sewerage facilities are very vital to the society and the degrees of dependence of the inhabitations to such facilities are extremely high.The decentralized approach is a new means of addressing wastewater management needs of sewerage area in a comprehensive fashion. The basic idea of that is to treat the wastewater (possibly together with refuses) on a centralized site by means of fairly low-cost treatment systems, and make direct use the treatment products (water, compost, and biogas). This alternative can meet a sustainable wastewater management requirement and has a promising future, especially for great city of Tehran, where the water and sanitation issues are becoming a more and more important issue as a water resource for agricultural activities. Such an Integrated Waste Water Management plans demand all aspects of the water cycle are considered and our awareness and expertise in all the aspects enable us to apply individual capabilities effectively, economically and in context. For example, the design of individual process schemes takes in the wider implications of supply and demandof agricultural water. The development of treatment schemes can include quantitative environmental risk assessment. Tehran city is situated at the foot hills of Alborz Mountain in the north, surrounded by Damavand Mountain in the north east, Karaj road in the south west & Varamin road, Tehran refinery and Saveh road in the south. The project will cause a significant improvement in the chemical, biological and microbiological quality of polluted surface waters in Tehran, and this will be lead to considerable public health benefits for the population of Teheran. Furthermore, the discontinuation of the use of sewage wells will prevent further contamination of ground water resource with nitrates and micro-organisms. Ground water levels within the city are expected to fall, reducing consequent damage to buildings and services. Also, the use of treated effluent and sludge for agriculture on the Varimin plane will lead to increased crop production, a reduction in dependence on artificial fertilisers and a more assured supply of irrigation water, allowing an expansion of the cropped area to 50000 hectares. The treatment plant effluent will be transferred to Varamin agricultural lands by pre-constructed Tehran Varamin canal in capacity of 8 cubic meters per second to be used in agricultural irrigation. The selected biological treatment process is based on the activated sludge process. The possibility of monitoring of discharges to the environment from the sewage treatment plant and industry, treated slates, surface water quality, and soil quality in the Varamin plane set procedures in the event of non-compliance with standards. Presentation of an optimum sewerage plant design certainly is in need of proper estimation of all affecting parameters in operating mechanism during the life of system. In this paper the best choice of affecting parameters within the defined operating range of agricultural activities is obtained in a rationalized and justified manner and upon providing adequate margin and safety factor is presented.

Keywords:

water resource for agricultural activity , low-cost treatment systems , Eco-toxicological studies