Assess the potential of UASB reactors operated at very low up flow velocities to treatment of low strength wastewater at mesophilic temperature 35 ⁰C
Masood A G Ali

Department of Geology and Environment , Faculty of Sciences, Baniwaleed University, Libya

Abstract

The research assessed the potential of up flow anaerobic sludge blanket (UASB) reactors operated at very low up flow velocities to provide full-flow anaerobic treatment of low strength wastewater at low temperature 35 ⁰C. The work was carried out using laboratory-scale UASB reactors fed on a synthetic wastewater, which was designed to simulate a typical unsettled municipal wastewater. The reactors were operated under a range of condition to test their performance and stability based on four main indicators: chemical oxygen demand (COD) removal, total suspended solids (TSS) removal, gas production and gas composition. The results from this investigation showed that UASB reactors operated at a temperature of 35⁰C were highly effective in the treatment of synthetic sewage at influent COD concentrations from 450 to 2250 mg l-1 COD at a constant HRT of 1 day, and at HRT from 24 to 8 hours with an influent COD concentration of 450 mg l-1. The specific methane yield obtained was around 0.32 l CH4 g-1 COD removed. COD removal efficiencies were high at ≥ 93 % and total suspended solid removal was around 95 %. The results confirmed that full flow treatment under mesophilic conditions, without heating of the UASB reactor, was feasible at wastewater temperatures of 35 ⁰C. The warm temperate areas that are suited to this application, e.g. the tropical countries and Mediterranean region, also often have relatively low water use and/or high rates of re-use due to water scarcity.

Keywords: wastewater treatment

Topic: INDUSTRIAL BIOTECHNOLOGY AND BIOPROCESSING

Link: https://ifory.id/abstract-plain/uw82a3kHZMKr

Web Format | Corresponding Author (MASOOD ABDUSALAM GHANEM ALI)