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  • Open Access


    Effects of Biowaste-Derived Hydrochar on Anaerobic Digestion: Insights into Hydrochar Characteristics

    Hongqiong Zhang1,2,#, Xu Wang3,#, Zhaojing Qian4, Buchun Si1,4,*, Kai Jin5, Tengfei Wang5

    Journal of Renewable Materials, Vol.11, No.10, pp. 3647-3657, 2023, DOI:10.32604/jrm.2023.028438

    Abstract Hydrochar prepared with four typical biowastes, pine wood, food waste, digested sewage sludge, and Chlorella were applied for the promotion of anaerobic digestion. The gas production and substrate composition were analyzed associated with the hydrochar characteristics. The results suggested that Chlorella hydrochar (C-C) showed the highest cumulative yield of methane (approximately 345 mL) with high total organic carbon (TOC) removal efficiency and low volatile fatty acids (VAFs) concentration. Especially, food waste hydrochar (F-C) showed a poor effect on anaerobic digestion and aroused 1.4–1.6 g/L accumulation of VAFs, in which the toxic components may account for the low efficiency. The C-C… More >

  • Open Access



    Ammar Hassan Soheela,*,†, Johain J. Farajb, Fawizea M. Hussienb

    Frontiers in Heat and Mass Transfer, Vol.20, pp. 1-11, 2023, DOI:10.5098/hmt.20.3

    Abstract The household batch reactor using cow manure as the substrate generates methane gas used as fuel. This paper presents two-dimensional (3D) axisymmetric using commercial COMSOL 5.5 Multiphysics software. This is a computational fluid dynamics (CFD) model based on conservation equations with the chemical reaction model of anaerobic digestion (AD) processes to investigate the influence of different horizontal circular extended surfaces augmented to the inside digesters on the performance of the anaerobic digestion. Using four batch digesters, D1 with no extended surfaces and D2, D3, and D4 have augmented with four horizontal circular extended surfaces of width 2,4 and 6 cm,… More >

  • Open Access


    The Role of Biochar to Enhance Anaerobic Digestion: A Review

    Shuai Tang1, Zixin Wang2, Zhidan Liu1, Yuanhui Zhang2, Buchun Si1,*

    Journal of Renewable Materials, Vol.8, No.9, pp. 1033-1052, 2020, DOI:10.32604/jrm.2020.011887

    Abstract Biochar, one of the products of thermochemical conversion of biomass, possesses specific physiochemical properties such as conductivity, pore adsorption, surface functional groups, and cation exchange capacity. Anaerobic digestion (AD) as a classical bio-wastes conversion technology, suffers from inhibitions, process instability, and methanogenic inefficiency which limit its effi- ciency. With the advantages of pH buffering, functional microbes enrichment, inhibitors alleviating, and direct interspecies electron transfer (DIET) accelerating, biochar suggests a promising application as additives for AD. Herein, this paper reviewed the noting physicochemical properties of biochar, and discussed its roles and related mechanisms in AD. Further, this paper highlighted the advantages… More >

  • Open Access


    Biodegradation of Medicinal Plants Waste in an Anaerobic Digestion Reactor for Biogas Production

    Kabir Fardad1, Bahman Najafi1, Sina Faizollahzadeh Ardabili1, Amir Mosavi2,3, Shahaboddin Shamshirband,4,5,*, Timon Rabczuk2

    CMC-Computers, Materials & Continua, Vol.55, No.3, pp. 381-392, 2018, DOI: 10.3970/cmc.2018.01803

    Abstract Glycyrrhiza glabra, Mint, Cuminum cyminum, Lavender and Arctium medicinal are considered as edible plants with therapeutic properties and as medicinal plants in Iran. After extraction process of medicinal plants, residual wastes are not suitable for animal feed and are considered as waste and as an environmental threat. At present there is no proper management of waste of these plants and they are burned or buried. The present study discusses the possibility of biogas production from Glycyrrhiza Glabra Waste (GGW), Mentha Waste (MW), Cuminum Cyminum Waste (CCW), Lavender Waste (LW) and Arctium Waste (AW). 250 g of these plants with TS… More >

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