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Enhanced Methane Production from Pretreatment of Waste Activated Sludge by Economically Feasible Biocatalysts

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  • Tae-Hoon Kim

    (Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Republic of Korea)

  • Dayeong Song

    (Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Republic of Korea)

  • Jung-Sup Lee

    (Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Republic of Korea)

  • Yeo-Myeong Yun

    (Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Republic of Korea)

Abstract

Crude hydrolytic extracellular enzymes (CHEEs) generated by a mixed culture of microorganisms during fermentation have a high potential as economically feasible biocatalysts for the hydrolysis of complex organic wastes. This study investigates the feasibility of CHEEs as substitutes for commercial enzymes based on a series of anaerobic batch tests for CH 4 production fed by pretreated waste activated sludge (WAS). The results showed that cellulase presented the highest CH 4 yield of 99.1 mL·CH 4 /g·COD of WAS among the samples pretreated with single commercial enzymes, with a yield 34% higher than that of the control sample. A higher diversity of commercial enzymes used in the pretreatment led to higher CH 4 production from WAS. The sample pretreated with a mixture of four commercial enzymes (amylase + protease + cellulase + lipase, APCL) presented a CH 4 yield of 216.0 mL·CH 4 /g·COD of WAS. The WAS prepared with CHEEs resulted in a CH 4 yield of 211.9 mL·CH 4 /g·COD of WAS, which is comparable to the performance of the sample pretreated with APCL. The results of the batch tests using pretreated WAS for different APCL concentrations showed that the CH 4 yield of WAS pretreated with CHEEs was comparable to the CH 4 yield of 0.34 g·APCL/g·COD of WAS.

Suggested Citation

  • Tae-Hoon Kim & Dayeong Song & Jung-Sup Lee & Yeo-Myeong Yun, 2023. "Enhanced Methane Production from Pretreatment of Waste Activated Sludge by Economically Feasible Biocatalysts," Energies, MDPI, vol. 16(1), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:1:p:552-:d:1023906
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    References listed on IDEAS

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    4. Zhen, Guangyin & Lu, Xueqin & Li, Yu-You & Zhao, Youcai, 2014. "Combined electrical-alkali pretreatment to increase the anaerobic hydrolysis rate of waste activated sludge during anaerobic digestion," Applied Energy, Elsevier, vol. 128(C), pages 93-102.
    5. Nges, Ivo Achu & Liu, Jing, 2009. "Effects of anaerobic pre-treatment on the degradation of dewatered-sewage sludge," Renewable Energy, Elsevier, vol. 34(7), pages 1795-1800.
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