The Study of Urban Treated Sewage Utilization in Green Space Irrigation

A Case Study Using Twon Ghods Sewage Refinery in Tehran

Abstract

In water shortage conditions, using treated urban sewage in irrigating green space can be a good solution. In order to study urban waste water utilization in green space irrigation, we selected the area of Twon Ghods Sewage Refinery in Tehran in this research. Lands treed with pinus nigra and under irrigation with waste water was selected as the experimental areaand lands treed with pinus nigra and under irrigation with well water as the control group. Three 20 m x 20 m plots were selected in a systematic random way in both areas. Leaf samples, soil samples (at a depth of 0-15 cm and a depth of 15-30 cm) and well water and waste water samples were collected in each plot at four times with 20 day intervals from early March to early May. The growth factors of the trees (height, trunk diameter, and diameter) were measured in mentioned plots. Results showed that treated sewage was better than well water in terms of irrigation quality. Overall, using urban treated sewage increases the performance of trees rather than using well water.