Reducing Effect of Sulfide and Increasing Potential of Biogas Production from High Sulfate Wastewater by Sulfide Oxidation and Denitrification Process
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Abstract
This research focuses on mitigating the impact of sulfide on methane-producing bacteria in biogas production system to enhance the efficiency of biogas production from high-sulfate wastewater by controlling the appropriate conditions within the system to facilitate the removal of organic substances, sulfate, and sulfide under anaerobic conditions. Experimental runs were conducted both in laboratory and rubber sheet establishment. At the laboratory scale, nitrate is added to the wastewater before it enters the system, with the Sulfate/Nitrate (S/N) ratio controlled at 2.0. The study examined Hydraulic Retention Times (HRT) of 10, 20, and 30 days. In the establishment, nitrate was sourced from nitrification system of wastewater from establishment without chemical addition. Results showed that operation at HRT of 10, 20, and 30 days provided organic removal efficiencies in form of COD (Chemical Oxygen Demand) at 61.18±1.52, 82.99±2.24, and 84.68±2.32%, respectively. At HRT of 30 days, the maximum biogas production rate was found to be 0.35±0.4% L-CH4/gCODremoved, with methane content comprising 71.2±0.4% of the gas. The experiment in establishment was found to work similarly to laboratory experiments, with average COD removal efficiency of 80.56±1.05% and average biogas production rate of 0.30±0.09 L-CH4/gCODremoved. The system in this study was able to reduce the effects of sulfides occurring in the system on methane-producing microorganisms. This has led to an increase in the activity of methane-producing microorganisms from the existing system of the establishment from average of 0.035±0.001 gCH4/gVSS/d increased to 0.060±0.001 gCH4/gVSS/d.
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