Moradi Marzieh, Sadani Mohsen, Shahsavani Abbas, Bakhshoodeh Reza, Alavi Nadali
Environmental and Occupational Hazards Control Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Environmental Health Engineering, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Heliyon. 2023 Jun 24;9(7):e17640. doi: 10.1016/j.heliyon.2023.e17640. eCollection 2023 Jul.
The reduction of traditional fuel sources and the unpredictability of the global economy have led to a push for renewable energy alternatives. Waste recycling can significantly reduce greenhouse gas emissions. In this study, the effects of different proportions of biochar on the efficiency of mesophilic anaerobic digestion of automotive paint sludge were investigated over a period of one month. A combination of paint sludge and anaerobic sludge in a ratio of three to one was used, and biochar was added to the anaerobic digestion reactor in two different amounts of 10 and 26 g/l, with a control sample without biochar. The cumulative volume of biogas produced at the end of the one-month experiment was recorded for three samples: the control sample (without biochar), the second sample (with 2 g of biochar), and the third sample (with 5.2 g of biochar). The volumes of biogas produced were 300, 380, and 530 ml, respectively. Additionally, the COD reduction rates were 25%, 33%, and 48%, and the VS decrement rates were 21%, 27%, and 43%, respectively. The findings showed that adding biochar to the anaerobic digestion reactor containing automotive paint sludge increased biogas production. Additionally, gas chromatography results for an optimal sample of biogas extracted from the anaerobic digestion reactor indicated the presence of about 50% methane gas. These results highlight the potential for utilizing biochar in anaerobic digestion processes to improve renewable energy production and waste management.
传统燃料源的减少和全球经济的不可预测性促使人们寻求可再生能源替代品。废物回收可以显著减少温室气体排放。在本研究中，在一个月的时间里，研究了不同比例的生物炭对汽车漆渣中温厌氧消化效率的影响。使用漆渣和厌氧污泥以三比一的比例混合，将生物炭以10克/升和26克/升两种不同用量添加到厌氧消化反应器中，同时设置一个不添加生物炭的对照样品。在为期一个月的实验结束时，记录了三个样品产生的沼气累积体积：对照样品（不添加生物炭）、第二个样品（添加2克生物炭）和第三个样品（添加5.2克生物炭）。产生的沼气量分别为300毫升、380毫升和530毫升。此外，化学需氧量（COD）降低率分别为25%、33%和48%，挥发性固体（VS）减量率分别为21%、27%和43%。研究结果表明，向含有汽车漆渣的厌氧消化反应器中添加生物炭可提高沼气产量。此外，从厌氧消化反应器中提取的最佳沼气样品的气相色谱结果表明，其中约含有50%的甲烷气体。这些结果凸显了在厌氧消化过程中利用生物炭来提高可再生能源产量和废物管理的潜力。
