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
{"title":"Optimization of biogas production with rice straw-derived biochar: Characterization, hormetic effects, and kinetics modelling","authors":"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","doi":"10.1016/j.clwas.2025.100288","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"11 ","pages":"Article 100288"},"PeriodicalIF":0.0000,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cleaner Waste Systems","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772912525000867","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
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.