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Impacts of ferric chloride, ferrous chloride and solid retention time on the methane-producing and physicochemical characterization in high-solids sludge anaerobic digestion

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  • Qin, Yujie
  • Chen, Linyi
  • Wang, Tongyu
  • Ren, Junyi
  • Cao, Yan
  • Zhou, Shaoqi

Abstract

This study used a batch experiment and a long-term experiment to investigate the effects of FeCl3 and FeCl2 on the high-solids anaerobic digestion (HSAD) of sludge for improving the methane productions. The results of batch experiment with an organic loading rate of 6.93 gVS/L suggested that the cumulative methane productions were enhanced by 28.9% and 6.4% with 200 mg/L FeCl3 and 250 mg/L FeCl2 in HSAD system, respectively. The higher methane productions were also obtained by 200 mg/L FeCl3 and 250 mg/L FeCl2 in the long-term experiment for 114d. An excessive FeCl3 could inhibit the HSAD process, which would be gradually recovered by the ammonia and the microbes acclimated to this environment. The organics degradation results indicated that the addition of 200 mg/L FeCl3 or 250 mg/L FeCl2 could show a positive effect on the substrate environment of a stable total volatile fatty acids (TVFA) concentration and pH, and promote the protease and dehydrogenase activities in HSAD system. In addition, the SRT played a significant role in the HSAD process by balancing hydrolysis-acidification and methanogenesis. An appropriate dosage of FeCl3 and FeCl2 improved the methane productions, and blocked the accumulation of TVFA caused by shortening SRT.

Suggested Citation

  • Qin, Yujie & Chen, Linyi & Wang, Tongyu & Ren, Junyi & Cao, Yan & Zhou, Shaoqi, 2019. "Impacts of ferric chloride, ferrous chloride and solid retention time on the methane-producing and physicochemical characterization in high-solids sludge anaerobic digestion," Renewable Energy, Elsevier, vol. 139(C), pages 1290-1298.
    • Handle: RePEc:eee:renene:v:139:y:2019:i:c:p:1290-1298
    DOI: 10.1016/j.renene.2019.02.139
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    References listed on IDEAS

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    1. Liao, Xiaocong & Li, Huan, 2015. "Biogas production from low-organic-content sludge using a high-solids anaerobic digester with improved agitation," Applied Energy, Elsevier, vol. 148(C), pages 252-259.
    2. Yang, Ziyi & Wang, Wen & He, Yanfeng & Zhang, Ruihong & Liu, Guangqing, 2018. "Effect of ammonia on methane production, methanogenesis pathway, microbial community and reactor performance under mesophilic and thermophilic conditions," Renewable Energy, Elsevier, vol. 125(C), pages 915-925.
    3. Nges, Ivo Achu & Liu, Jing, 2010. "Effects of solid retention time on anaerobic digestion of dewatered-sewage sludge in mesophilic and thermophilic conditions," Renewable Energy, Elsevier, vol. 35(10), pages 2200-2206.
    4. Gustavsson, Jenny & Shakeri Yekta, Sepehr & Sundberg, Carina & Karlsson, Anna & Ejlertsson, Jörgen & Skyllberg, Ulf & Svensson, Bo H., 2013. "Bioavailability of cobalt and nickel during anaerobic digestion of sulfur-rich stillage for biogas formation," Applied Energy, Elsevier, vol. 112(C), pages 473-477.
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    2. Regimantas Dauknys & Aušra Mažeikienė, 2023. "Process Improvement of Biogas Production from Sewage Sludge Applying Iron Oxides-Based Additives," Energies, MDPI, vol. 16(7), pages 1-15, April.

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