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<p>Aqueous sulfide, a product of the sulfate-reducing process in undissociated form, is a potent inhibitor of methanogens. Furthermore, the biogas generated from the anaerobic digestion of skim latex wastewater (SLW) typically contains &gt; 10,000&#xa0;ppm H<sub>2</sub>S. In this study, we investigated the role of zero-valent iron (ZVI) as a sink for both sulfides generated from the reduction of sulfate in SLW and CO<sub>2</sub> from acetoclastic methanogenesis. The ZVI-based anaerobic digestion was performed in a fed-batch reactor fed with SLW for 30&#xa0;days at an organic loading rate (OLR) of 2.34&#xa0;g COD/L d and a COD/SO<sub>4</sub><sup>2−</sup> ratio of around 3. The concentrations of undissociated sulfide in the reactor added with ZVI were 9.1 ± 3.3&#xa0;mg/L S<sup>2−</sup>. In contrast, the concentrations of undissociated sulfide in a control reactor were 157.2 ± 44.4&#xa0;mg/L S<sup>2−</sup>, which were closer to the levels that can be toxic to methanogens. The ZVI addition promoted the precipitation of iron sulfide and carbonate at a medium pH of 7.9. The biogas generated from the ZVI-based reactor had 94–96% CH<sub>4</sub>, 4–6% CO<sub>2</sub>, and undetectable amounts of H<sub>2</sub>S. However, the methane production in the ZVI-based anaerobic digester decreased by 7.9%, possibly due to the buildup of partial pressure of H<sub>2</sub> and subsequent propionate accumulation.</p>

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Application of zero valence iron for anaerobic digestion of skim latex wastewater: advantages and challenges

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月25日

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  • Papichaya Paleeleam,
  • Nuntiya Paepatung,
  • Pornpan Panichnumsin,
  • Jarungwit Boonnorat,
  • Ha Manh Bui,
  • Chantaraporn Phalakornkule

摘要

Aqueous sulfide, a product of the sulfate-reducing process in undissociated form, is a potent inhibitor of methanogens. Furthermore, the biogas generated from the anaerobic digestion of skim latex wastewater (SLW) typically contains > 10,000 ppm H2S. In this study, we investigated the role of zero-valent iron (ZVI) as a sink for both sulfides generated from the reduction of sulfate in SLW and CO2 from acetoclastic methanogenesis. The ZVI-based anaerobic digestion was performed in a fed-batch reactor fed with SLW for 30 days at an organic loading rate (OLR) of 2.34 g COD/L d and a COD/SO42− ratio of around 3. The concentrations of undissociated sulfide in the reactor added with ZVI were 9.1 ± 3.3 mg/L S2−. In contrast, the concentrations of undissociated sulfide in a control reactor were 157.2 ± 44.4 mg/L S2−, which were closer to the levels that can be toxic to methanogens. The ZVI addition promoted the precipitation of iron sulfide and carbonate at a medium pH of 7.9. The biogas generated from the ZVI-based reactor had 94–96% CH4, 4–6% CO2, and undetectable amounts of H2S. However, the methane production in the ZVI-based anaerobic digester decreased by 7.9%, possibly due to the buildup of partial pressure of H2 and subsequent propionate accumulation.