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Anaerobic Fluidized-Bed Membrane Bioreactor for Treatment of Liquid Fraction of Sludge Digestate: Performance and Agricultural Reuse Analysis

Author

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  • Lu Liu

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Jun Zhang

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Yifan Chen

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Ze Guo

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Ganzhan Xu

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Linlin Yin

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Yu Tian

    (National Engineering Research Center For Safe Disposal and Resources Recovery of Sludge, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Stevo Lavrnić

    (Department of Agricultural and Food Sciences, Alma Mater Studiorum-University of Bologna, Viale Giuseppe Fanin 40-50, 40127 Bologna, Italy)

Abstract

The treatment of sludge digestion liquid is a big challenge in wastewater treatment. If treated as normal wastewater, large amounts of nitrogen and phosphorus present in the sludge digestion liquid might be wasted when they could be reused in agricultural irrigation and reduce the consumption of artificial fertilizers. Thus, it is of utmost importance to deliver a simple and feasible strategy to treat sludge digestion liquid for agricultural reuse. In this study, a novel type of anaerobic fluidized bed membrane bioreactor system (US-AnFMBR) was developed by combining an ultrasonic processing unit and biochar in AnFMBR. The improvement of sludge properties, removal of pollutants performance and membrane fouling mitigation were achieved in this novel system. The optimal dose of BC (biochar) was 2.5 g·L −1 , and the optimal ultrasonic treatment conditions were 30 min at 26 W. The main contribution of ultrasound was to improve the activity of sludge microorganisms to adsorb and degrade more organic matter present in sewage. The system achieved the removal efficiencies of COD, NH 4 + -N and PO 4 3− -P up to 89.41%, 49.29% and 54.83%, respectively, and had a better mitigation effect in terms of membrane fouling. On the one hand, the biochar addition for COD removal performance was mainly manifested in membrane rejection performance. On the other hand, the combination of low-cost biochar and AnFMBR can also provide new ideas for the recycling of agricultural waste for biochar production. However, regarding the removal efficiency of NH 4 + -N and PO 4 3− -P, the US-AnFMBR system promoted the activity of starved sludge to preferentially absorb NH 4 + -N compared with PO 4 3− -P by statistical analysis. The US-AnFMBR can reduce the viscosity of sludge and release more small molecular substances, thus better mitigating membrane fouling. Long-term operation performance also revealed the excellent stability of the sludge digestion liquid treatment. The US-AnFMBR system achieves the recovery of nitrogen and phosphorus resources for subsequent agricultural recycling, and avoids the eutrophication of water ecosystems. Reclaimed water meets the nutrient requirements of typical crops during the growing season. To a certain extent, carbon emission reductions in agriculture can be achieved.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7698-:d:1141769
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    References listed on IDEAS

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    2. Chowdhury, M.M.I. & Nakhla, G. & Zhu, J., 2017. "Ultrasonically enhanced anaerobic digestion of thickened waste activated sludge using fluidized bed reactors," Applied Energy, Elsevier, vol. 204(C), pages 807-818.
    3. 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.
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