Investigating and Evaluating the Quality of the Physicochemical Parameters of the Treated Sewage of Kish Island in the Green Space Irrigation

In this study, the quality of the treated wastewater of Kish Island, which is the main source of irrigation for the urban area of Kish, was evaluated. First, samples were taken from 12 water storage points and transferred to the water and wastewater laboratory of Tehran University. The samples were transferred to the Laboratory of Tehran University and the physicochemical parameters include pH, EC, BOD5, COD, TSS, TDS, SAR, phosphate and nitrate, Mg, Ca and Na were measured. The results showed that in green space irrigation tanks, the water is pH and EC are between 0.2 and 1.9, which is lower than the standard; 7 reservoirs including Marjan Park, Hangman, Cactus Pool, Convention Center Pool, Iran Pool, Bagh Rah and Golestan Park Pool have BOD higher than the standard, which is considered a biological hazard for the environment. TSS is higher than the standard in 7 reservoirs, which include Marjan Park, Hangman Park, Cactus Pool, Iran Pool, Bagh Rah and Golestan. According to international standards, the amount of phosphate in water reservoirs is high and requires its management, especially in sewage treatment plants. The highest SAR was in the convention center, North Water Treatment Plant and Golestan Park, but its level in Pavion, Marjan Park, Simorgh and Cactus was less than 4, indicating its desirability for irrigation. But the reservoirs of the convention center and the northern treatment plant require more management, because the long-term use of this wastewater can lead to salting of the soil of Kish Island.