Evaluation of Treated Wastewater in Terms of Environmental Standards

Abstract

The desired use of refined wastewater has not yet found its proper place in many countries, therefore, achieving a relative equilibrium in the field of urban wastewater evacuation and re-utilizing it is a fundamental principle. And this great matter is not possible except by developing a comprehensive refinery waste management system. The set of measures that have been taken so far in relation to sewage treatment has been mainly focused on the management of the design of new treatment systems and their optimization and little attention has been paid to the management of wastewater drainage and reuse. Due to the shortage of water crisis and the cost of improving water resources and refining it in the country, treated urban and industrial wastewater can be utilized for various urban and non-urban purposes and that the type of reuse depends on the quantity and quality of raw sewage, the degree of purification required, the purification cost and the type of regulation and environmental standard. Biological contamination is one of the most important concerns about the use of wastewater in irrigation. Generally, in most of the standards provided after the secondary purification process, disinfection is a complementary process. In this case, the use of sewage wastewater is recommended in irrigation of food products and parks. It is clear that the high concentration of elements such as nitrogen and phosphorus is very useful for plant growth and can replace chemical fertilizers. In assessing the compliance of refined wastewater with environmental protection standards, it can be concluded that the parameters of the effluent treated by the control filter are more than the standard used in agriculture, or the discharge to the absorption well and also the release in surface waters. The parameters of other treatments are less than the standard and so there is no problem in using it. With the use of Chahar-Tokhm powder, the best method in this article is to treat the filter in addition to potassium permanganate powder. Also, methods of removing wastewater by sand filtration with Chahar-Tokhm powder and potassium permanganate powder have been investigated in order to reduce the contamination, which according to the results has been shown to be a good performance. Which among urban wastewater treatments has a good quality for use in agricultural land, green space irrigation.