Qualitative Study of Effluent of Three Types of Wastewater Treatment Systems from The Perspective of Physicochemical and Microbial Indicators for Use in Agriculture

Population growth causes the need to produce more agricultural products. And the lack of water causes people to use unconventional waters, including treated sewage. Improper quality of wastewater can be harmful to the soil, plants and the health of consumers. Therefore, it is necessary to measure and check their quality.
In this study, the factors of EC, BOD, COD, TSS, TN, TP, PH, Ecoli, TC, CL,Ca, Mg, Na, SAR in effluent treatment plants, Sabzevar stabilization pond, activated sludge (Factory sanitary wastewater) and rural Wetland with Tested by standard methods. (according to 2017 version of the book Standard Methods for the Examination of Water and Wastewater) and compared with Wilcox, Ayers and Westcot, FAO, WHO, USEPA standards.To determine the competence of three different types of effluent for agricultural use.
In accordence with the standards of Iran, Wilcox, Ayers and Westcot, FAO and WHO, all three types of effluent can be used for irrigation with low to moderate negative impacts. However, in the more stringent standards (USEPA), stabilization pond and Wetland did not meet the BOD, TSS factors threshold, and the activated sludge effluent did not provide the BOD factor.
According to the results, the activated sludge treatment system meets the standards of wastewater consumption in agriculture better than the other two systems. Over time, the standards will become stricter. Choosing the type and correct operation of the treatment system has a significant impact on providing the quality standards of effluent for irrigation.