Papichaya Paleeleam.. The study of methane production and sulfate reduction in ZVI implemented fed-batch treating skim latex wastewater. Master's Degree(Chemical Engineering). King Mongkut's University of Technology North Bangkok. Central Library. : King Mongkut's University of Technology North Bangkok, 2023.
The study of methane production and sulfate reduction in ZVI implemented fed-batch treating skim latex wastewater
Abstract:
Anaerobic digestion (AD) of skim latex wastewater (SLW) remains a challenge because the wastewater contains high sulfate and has low ratios of chemical oxygen demand (COD) to sulfate, due to the competition between methane-producing archaea (MPA) and sulfate-reducing bacteria (SRB) for organic carbon sources. Moreover, the biogas produced from the SLW contained high levels of H2S (> 10,000 ppm). This study aims to assess the effect of ZVI addition on the performances of AD of SLW in fed-batch reactors in terms of CH4 production, COD and sulfate removal efficiency, and H2S concentrations in biogas. The 3.5-L fed-batch stirred-tank reactor was inoculated with 10 g/L of anaerobic sludge and was operated at an organic loading rate (OLR) of 2.34 ± 0.01 g/L d COD for 39 days, and was fed with SLW. Throughout the experimental course, ZVI addition can reduce sulfide toxicity by FeS precipitation and raising pH, increase sulfate removal, and improve the purity of biogas by reducing CO2 and H2S and increasing CH4 composition in biogas. However, when compared to the control reactor, the methane production of the ZVI reactor was lower around 8% due to the accumulation of H2 partial pressure and propionate formation.