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Combined electrical-alkali pretreatment to increase the anaerobic hydrolysis rate of waste activated sludge during anaerobic digestion

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  • Zhen, Guangyin
  • Lu, Xueqin
  • Li, Yu-You
  • Zhao, Youcai

Abstract

Pretreatment can be used prior to anaerobic digestion to improve the efficiency of waste activated sludge (WAS) digestion. In this study, electrolysis and a commonly used pretreatment method of alkaline (NaOH) solubilization were integrated as a pretreatment method for promoting WAS anaerobic digestion. Pretreatment effectiveness of combined process were investigated in terms of disintegration degree (DDSCOD), suspended solids (TSS and VSS) removals, the releases of protein (PN) and polysaccharide (PS), and subsequent anaerobic digestion as well as dewaterability after digestion. Electrolysis was able to crack the microbial cells trapped in sludge gels and release the biopolymers (PN and PS) due to the cooperation of alkaline solubilization, enhancing the sludge floc disintegration/solubilization, which was confirmed by scanning electron microscopy (SEM) analysis. Biochemical methane potential (BMP) assays showed the highest methane yield was achieved with 5V plus pH 9.2 pretreatment with up to 20.3% improvement over the non-pretreated sludge after 42days of mesophilic operation. In contrast, no discernible improvements on anaerobic degradability were observed for the rest of pretreated sludges, probably due to the overmuch leakage of refractory soluble organics, partial chemical mineralization of solubilized compounds and sodium inhibition. The statistical analysis further indicated that increased solubilization induced by electrical-alkali pretreatment increased the first-order anaerobic hydrolysis rate (khyd), but had no, or very slight enhancement on WAS ultimate methane yield (fd), demonstrating that increased solubilization of WAS from a pretreatment does not always induce an improved anaerobic digestion efficiency.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:128:y:2014:i:c:p:93-102
    DOI: 10.1016/j.apenergy.2014.04.062
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    1. Zhen, Guangyin & Lu, Xueqin & Kato, Hiroyuki & Zhao, Youcai & Li, Yu-You, 2017. "Overview of pretreatment strategies for enhancing sewage sludge disintegration and subsequent anaerobic digestion: Current advances, full-scale application and future perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 559-577.
    2. Ebenezer, A. Vimala & Arulazhagan, P. & Adish Kumar, S. & Yeom, Ick-Tae & Rajesh Banu, J., 2015. "Effect of deflocculation on the efficiency of low-energy microwave pretreatment and anaerobic biodegradation of waste activated sludge," Applied Energy, Elsevier, vol. 145(C), pages 104-110.
    3. Hassan, Muhammad & Zhao, Chao & Ding, Weimin, 2020. "Enhanced methane generation and biodegradation efficiencies of goose manure by thermal-sonication pretreatment and organic loading management in CSTR," Energy, Elsevier, vol. 198(C).
    4. Li, Wei & Guo, Jianbin & Cheng, Huicai & Wang, Wei & Dong, Renjie, 2017. "Two-phase anaerobic digestion of municipal solid wastes enhanced by hydrothermal pretreatment: Viability, performance and microbial community evaluation," Applied Energy, Elsevier, vol. 189(C), pages 613-622.
    5. Kong, Fanying & Ren, Hong-Yu & Pavlostathis, Spyros G. & Nan, Jun & Ren, Nan-Qi & Wang, Aijie, 2020. "Overview of value-added products bioelectrosynthesized from waste materials in microbial electrosynthesis systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 125(C).
    6. Wang, Xuezhi & Lei, Zhongfang & Shimizu, Kazuya & Zhang, Zhenya & Lee, Duu-Jong, 2021. "Recent advancements in nanobubble water technology and its application in energy recovery from organic solid wastes towards a greater environmental friendliness of anaerobic digestion system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
    7. 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.
    8. Panigrahi, Sagarika & Sharma, Hari Bhakta & Tiwari, Bikash Ranjan & Krishna, Nakka Vamsi & Ghangrekar, M.M. & Dubey, Brajesh Kumar, 2021. "Insight into understanding the performance of electrochemical pretreatment on improving anaerobic biodegradability of yard waste," Renewable Energy, Elsevier, vol. 180(C), pages 1166-1178.
    9. Hwijin Seo & Anna Joicy & Myoung Eun Lee & Chaeyoung Rhee & Seung Gu Shin & Si-Kyung Cho & Yongtae Ahn, 2023. "Development of a Primary Sewage Sludge Pretreatment Strategy Using a Combined Alkaline–Ultrasound Pretreatment for Enhancing Microbial Electrolysis Cell Performance," Energies, MDPI, vol. 16(10), pages 1-14, May.
    10. Lu Liu & Jun Zhang & Yifan Chen & Ze Guo & Ganzhan Xu & Linlin Yin & Yu Tian & Stevo Lavrnić, 2023. "Anaerobic Fluidized-Bed Membrane Bioreactor for Treatment of Liquid Fraction of Sludge Digestate: Performance and Agricultural Reuse Analysis," Sustainability, MDPI, vol. 15(9), pages 1-17, May.
    11. Zhao, Jiamin & Hou, Tingting & Wang, Qian & Zhang, Zhenya & Lei, Zhongfang & Shimizu, Kazuya & Guo, Wenshan & Ngo, Huu Hao, 2021. "Application of biogas recirculation in anaerobic granular sludge system for multifunctional sewage sludge management with high efficacy energy recovery," Applied Energy, Elsevier, vol. 298(C).
    12. Zhen, Guangyin & Pan, Yang & Lu, Xueqin & Li, Yu-You & Zhang, Zhongyi & Niu, Chengxin & Kumar, Gopalakrishnan & Kobayashi, Takuro & Zhao, Youcai & Xu, Kaiqin, 2019. "Anaerobic membrane bioreactor towards biowaste biorefinery and chemical energy harvest: Recent progress, membrane fouling and future perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
    13. Lübken, Manfred & Koch, Konrad & Gehring, Tito & Horn, Harald & Wichern, Marc, 2015. "Parameter estimation and long-term process simulation of a biogas reactor operated under trace elements limitation," Applied Energy, Elsevier, vol. 142(C), pages 352-360.
    14. Cano, R. & Pérez-Elvira, S.I. & Fdz-Polanco, F., 2015. "Energy feasibility study of sludge pretreatments: A review," Applied Energy, Elsevier, vol. 149(C), pages 176-185.
    15. 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.
    16. Agnieszka Garlicka & Monika Zubrowska-Sudol & Katarzyna Umiejewska & Otton Roubinek & Jacek Palige & Andrzej Chmielewski, 2020. "Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion," Energies, MDPI, vol. 13(10), pages 1-15, May.
    17. Koch, Konrad & Helmreich, Brigitte & Drewes, Jörg E., 2015. "Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant," Applied Energy, Elsevier, vol. 137(C), pages 250-255.
    18. Alsayed Mostafa & Min-Gyun Kim & Seongwon Im & Mo-Kwon Lee & Seoktae Kang & Dong-Hoon Kim, 2020. "Series of Combined Pretreatment Can Affect the Solubilization of Waste-Activated Sludge," Energies, MDPI, vol. 13(16), pages 1-11, August.
    19. Elsamadony, M. & Tawfik, A. & Suzuki, M., 2015. "Surfactant-enhanced biohydrogen production from organic fraction of municipal solid waste (OFMSW) via dry anaerobic digestion," Applied Energy, Elsevier, vol. 149(C), pages 272-282.
    20. Zhen, Guangyin & Lu, Xueqin & Kobayashi, Takuro & Li, Yu-You & Xu, Kaiqin & Zhao, Youcai, 2015. "Mesophilic anaerobic co-digestion of waste activated sludge and Egeria densa: Performance assessment and kinetic analysis," Applied Energy, Elsevier, vol. 148(C), pages 78-86.

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