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

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.
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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CiteScore
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