The Effect of Sewage Sludge Application on Soil Chemical Properties in Greenhouse Conditions of Helianthus Annuus

Abstract

Today, due to legal restrictions on the methods burying sewage sludge, environmentalists recommend using it as a fertilizer as a fertilizer in agriculture to get rid of the problems caused by sludge produced in treatment plants. Sewage sludge can be the best and cheapest organic fertilizer for agricultural lands due to its high content of organic compounds and nutrients required by the plant. But at the same time toxic factors such as heavy metals in sludge are the most important limiting factor for its use. The purpose of this study was to investigate the effect of sewage sludge application on some soil chemical properties and heavy soil metals. This study was carried out in the Aburaihan Campus Research Greenhouse of Tehran University with three levels of sewage sludge for anaerobic and dehydrated anaerobic wastewater treatment plant south of Tehran containing 0, 10 and 20 g/kg soil, in three replications in a completely randomized block design on Helianthus annuus. After finishing the growing season, the Soil of control and treated pots were sampled. After physical and chemical tests on soil samples, it was observed that application of sewage sludge in soil significantly increased Organic Matter (O.M), Cation Exchange Capacity (CEC), Salinity (EC), total nitrogen, potassium and Heavy metals Pb, Ni, Cd concentrations, and There was a significant decrease in pH in the treated soils compared to the control treatment. Also, treatment of 20 g of sewage sludge per kg soil had the best effect on soil chemical properties.

Keywords

• heavy metals
• helianthus annuus
• reuse of sewage sludge
• soil properties
• south tehran wastewater treatment plant