Lepota Khanyisile D T, Premlall Kasturie, Mabuza Major M
Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa.
Department of Chemical Engineering Technology, Faculty of Engineering and the Built Environment, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2088, South Africa.
ACS Omega. 2025 Aug 29;10(36):41270-41282. doi: 10.1021/acsomega.5c04105. eCollection 2025 Sep 16.
Landfilling is one of the primary techniques utilized globally to manage municipal solid waste (MSW), particularly in developing nations. Unlike existing conventional methods, hybrid bioreactor landfilling technology is a promising sustainable approach for maximizing biogas production from MSW. This study aimed to evaluate the application of hybrid bioreactor technology to enhance biogas production from the organic fraction of MSW. Over a 7-month period, two columns were utilized to simulate typical (Br-1) and hybrid (Br-2) landfill bioreactors while monitoring the quality of leachate and biogas generated. Results showed contaminant reduction in leachate with the pH increasing to 8 in Br-2, while Br-1 remained acidic below 7. Physicochemical parameter reductions ranged from 33 to 98%, while total organic carbon and carbon oxygen demand (TOC/COD) ratio varied between 0.04 and 0.61. Analyzed heavy metals reductions ranged from 3 to 88%. Biogas generated was 8.75 L with methane (CH) below 50% in Br-1, while Br-2 produced 21.5 L with CH exceeding 60%. The final CH concentration reached 67% in Br-2 and 52% in Br-1. Partial aeration and diluted leachate recirculation enhanced biodegradation in Br-2 while the leachate was treated in situ. The high CH content and 41-fold greater biogas yield in Br-2 showed the economic and ecological viability of this method for biogas-to-energy projects.
填埋是全球用于管理城市固体废物（MSW）的主要技术之一，在发展中国家尤为如此。与现有的传统方法不同，混合生物反应器填埋技术是一种很有前景的可持续方法，可最大限度地从城市固体废物中产生沼气。本研究旨在评估混合生物反应器技术在提高城市固体废物有机部分沼气产量方面的应用。在7个月的时间里，使用两个柱体来模拟典型（Br-1）和混合（Br-2）垃圾填埋生物反应器，同时监测产生的渗滤液和沼气的质量。结果表明，Br-2中渗滤液的污染物减少，pH值升至8，而Br-1仍呈酸性，低于7。物理化学参数的减少幅度在33%至98%之间，而总有机碳与化学需氧量（TOC/COD）的比值在0.04至0.61之间变化。分析得出的重金属减少幅度在3%至88%之间。Br-1产生的沼气为8.75升，甲烷（CH）含量低于50%，而Br-2产生21.5升，CH含量超过60%。Br-2中最终的CH浓度达到67%，Br-1中达到52%。部分曝气和稀释渗滤液再循环增强了Br-2中的生物降解作用，同时渗滤液在原地得到处理。Br-2中高含量的CH和高41倍的沼气产量表明了该方法在沼气转化为能源项目中的经济和生态可行性。
