Optimization of biogas production with rice straw-derived biochar: Characterization, hormetic effects, and kinetics modelling

Cleaner Waste Systems Pub Date : 2025-04-19 DOI:10.1016/j.clwas.2025.100288

Utibe A. Ofon , Uduak U. Ndubuisi-Nnaji , Godwin E. Udofia , Anthony A. Adegoke , E.E. Orji , Mboutidem I. Ekaette , Charity A. Ukot , Nnanake-Abasi O. Offiong , Dele P. Fapojuwo , Solomon E. Shaibu

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Abstract

One of the drawbacks of anaerobic digestion (AD) is the slow process startup. This study evaluated rice straw-derived biochar (RSB) to accelerate the anaerobic co-digestion of paper waste (PW) and chicken manure (CM). Rice straw pyrolyzed at 550°C (RSB550) was characterized by SEM, EDX, BET, FTIR, CEC, and CHN analyses before supplementation. Different doses (0, 2, 4, 6, and 10 % w/v) were tested in a batch system co-digesting PW and CM (2:1) under thermophilic conditions (45°C) for 44 days. RSB550 exhibited a surface area of 23.5 m²g⁻¹ , a pore volume of 0.1 cm³g⁻¹ , a pore size of 15.4 nm, and a CEC of 2.0 meq/100 g, favorable for AD. Biogas yield was dose-dependent and significant via ANOVA, with 2 % RSB550 increasing production by 31.74 % compared to the control. Excess biochar reduced yield. Modified Gompertz modeling fit well (R²: 0.995–0.999), confirming biochar as a promising strategy for enhancing AD efficiency.

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秸秆生物炭生产沼气的优化：表征、热效应和动力学建模

厌氧消化（AD）的缺点之一是过程启动缓慢。研究了秸秆生物炭（RSB）对废纸（PW）和鸡粪（CM）厌氧共消化的促进作用。在补充前，通过SEM， EDX， BET， FTIR， CEC和CHN分析对550°C热解的水稻秸秆（RSB550）进行了表征。不同剂量（0、2、4、6和10 % w/v）在嗜热条件（45°C）下的批处理系统中共消化PW和CM(2:1)，测试44天。RSB550的表面积为23.5 m²g⁻¹ ，孔容为0.1 cm³g⁻¹ ，孔径为15.4 nm， CEC为2.0 meq/100 g，有利于AD的发展。通过方差分析发现，2 % RSB550与对照相比，产量增加了31.74 %。过量的生物炭降低了产量。修正的Gompertz模型拟合良好（R²：0.995-0.999），证实生物炭是提高AD效率的有效策略。

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来源期刊

Cleaner Waste Systems

CiteScore

2.60

自引率

0.00%

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