Novel technique for sustainable utilisation of water hyacinth using EGSB and MCSTR: Control overgrowth, energy recovery, and microbial metabolic mechanism

Jianfeng Liu, Zhengkang Tang, Changmei Wang, Kai Wu, Yuanlin Song, Xingping Wang, Zhiwen Zhang, Xingling Zhao, Bin Yang, Mingguo Piao, Fang Yin and Wudi Zhang

Renewable Energy, 2021, vol. 163, issue C, 1701-1710

Abstract: An expanded granular sludge bed (EGSB) and modified continuous stirred tank reactor (MCSTR) were investigated with respect to the treatment of water hyacinth juice (WHJ) and water hyacinth residue (WHR), to promote the utilisation of water hyacinth as a resource and control its excessive growth. The results revealed that EGSB and MCSTR can efficiently manage WHJ and WHR. The energy recovery efficiency of water hyacinth was 21.10 m3 biogas/t, wherein the WHJ in EGSB produced 0.190 m3 biogas/kg chemical oxygen demand, and the WHR in MCSTR generated 397 mL biogas/g total solid. High-throughput sequencing analyses indicated that the MCSTR and EGSB had similar dominant microbial composition in the hydrolytic acidification phase, while genus norank_o__NB1-n was unique to the MCSTR. The methanogenesis metabolic pathways of WHR contained both acetoclastic methanogenesis and hydrogenotrophic methanogenesis, where the dominant functional microorganisms were Methanosaeta and Methanobacterium, respectively. However, the methanogenetic metabolic pathways of WHJ involved only acetoclastic methanogenesis, with Methanosaeta as the dominant functional microorganism. A novel processing technology for the sustainable utilisation of water hyacinth was successfully established. This technology allowed for substance circulation and energy exchange in the ecosystem and is suitable for industrial applications owing to its performance, cost, and environment-friendly characteristics.

Keywords: Water hyacinth juice; Water hyacinth residue; Expanded granular sludge bed; Modified continuous stirred tank reactor; Control overgrowth; Energy recovery efficiency (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:163:y:2021:i:c:p:1701-1710

DOI: 10.1016/j.renene.2020.10.093

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