Enhancement of biomethane yield rate in anaerobic co-digestion of cattle dung and untreated vegetable waste through the amendment of water-hyacinth biochar

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-02-01 DOI:10.1016/j.biteb.2024.102013

Shayaram Basumatary , Harrison Hihu Muigai , Pranab Goswami , Pankaj Kalita

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Abstract

This study investigates the effect of biochar (BC) amendment on the anaerobic co-digestion (AcoD) of cattle dung (CD) and untreated vegetable waste (VW) performed at different co-substrates mixing ratios (CMR) of 70:30, 60:40, 50:50, 40:60, and 30:70 under ambient and mesophilic conditions. The mesophilic BC-added digester with a CMR of 60:40 exhibited 13.19 % and 39.26 % higher cumulative methane yield (CMY) than the corresponding uncontrolled digesters (CMR 60:40) with and without BC-added over 45 days of experiments. Subsequently, considering CMR 60:40, another group of biochemical methane potential experiments was conducted at ambient conditions, incorporating varying amounts of BC, viz. 5, 10, 15, 20, and 25 gL⁻¹. The digester comprising 15 gL⁻¹ BC achieved the highest CMY, recommending it as the optimal amount of BC addition for the AcoD of CD and VW. This study discloses that BC addition is a significant approach to increasing CH₄ yield.

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通过添加水葫芦生物炭提高牛粪与未经处理的蔬菜废弃物厌氧共消化的生物甲烷产率

本研究研究了生物炭（BC）在不同底物混合比（CMR）为70:30、60:40、50:50、40:60和30:70的环境和中温条件下对牛粪（CD）和未经处理的蔬菜废物（VW）厌氧共消化（AcoD）的影响。在45 d的试验中，CMR为60:40的中温沼气池的累积甲烷产量（CMY）比相应的非控制沼气池（CMR为60:40）分别高出13.19%和39.26%。随后，考虑到CMR 60:40，在环境条件下进行另一组生化甲烷势实验，加入不同量的BC，即5、10、15、20和25 gL−1。添加15gl−1 BC的沼气池CMY最高，推荐其为CD和VW AcoD的最佳添加量。本研究表明，添加BC是提高CH4产率的重要途径。

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