The Feasibility of Using the Aerobic-Anaerobic Bioreactor (Microbiological Processes) Sludge of Municipal Wastewater Treatment Plant of Tabriz for Agricultural Purpose

Sewage disposal produced by human societies and treatment of wastewater is essential for urban management and public health. With Plant construction, problems of production and disposal of sludge drying generally occur. With the development of communities and increase the refineries, treatment and disposal of sludge, optimal and comprehensive management is required. The disposal of sludge if containing organic matter, nutrients and micronutrients in the case of pollutants such as heavy metals concentrations, pathogens and ... are in standard, its application is in agriculture. This study was carried out in order to assess the quality of sludge produced from wastewater of treatment plant in Tabriz to use in agricultural production, in terms of heavy metals chromium, nickel, zinc, cadmium, copper and lead. Sampling was done in Four Seasons for 5 years from 2009 to 2014 based on the standard method. Determining the concentration of heavy metals by atomic absorption Varian 220 depending on the desired parameter analysis, were analyzed using the VGA, GTA, Flame Atomic Absorption method. To compare the measured amounts of heavy metals in different seasons and years, one-sided ANOVA and to compare the measured values with national and international standards one-sided t-test was used. The results showed that levels of heavy metals studied in different seasons and years had no significant difference. Compare the measured values with the standards of the EPA and the Environmental Protection Agency of Iran were determined, Average heavy metal sludge of Tabriz were lower than standard doses of EPA and Environmental Protection Agency of Iran And can be used as fertilizer for agricultural production.