Simulation of gray water treatment systems to produce non-potable quality water

Document Type : Scientific Paper

Authors

1 PhD Candidate, Department of Renewable Energies, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

2 Associate Professor, Department of Renewable Energies, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

3 Bachelor student, Environmental Health Engineering, Shahid Beheshti University, Tehran

Abstract

Due to the importance of water scarcity in Iran and the need for water supply from wastewater and gray water treatment, in this paper by simulating and investigating the removal of contaminants in conventional gray water treatment systems up flow anaerobic sludge blanket (UASB), UASB with returned activated sludge, UASB with continuous stirred tank reactor (CSTR) and membrane bioreactor (MBR) along with CSTR reactor were simulated in GPS-x software and the removal efficiency of wastewater contaminants was evaluated. According to the results, the membrane bioreactor with CSTR reactor had the highest removal efficiency of chemical oxygen demand (COD), biological oxygen demand (BOD), total nitrogen (TN) and total suspended solids (TSS) removal equal to 94.11, 99.29, 70.56 and 99.17%, respectively. Compared to other treatment systems due to the simultaneous use of filtration systems and biological reactions along with anaerobic treatment, and only this system, the quality of wastewater according to environmental standards for reuse of gray water for non-food purposes provide.

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