Barla Rachael J, Gupta Suresh, Raghuvanshi Smita
Faculty Division-1, Department of Chemical Engineering, Birla Institute of Technology and Science (BITS PILANI), Pilani, 333031, Rajasthan, India.
Sci Rep. 2024 Jul 17;14(1):16529. doi: 10.1038/s41598-024-67053-2.
Flue gas emissions are the waste gases produced during the combustion of fuel in industrial processes, which are released into the atmosphere. These identical processes also produce a significant amount of wastewater that is released into the environment. The current investigation aims to assess the viability of simultaneously mitigating flue gas emissions and remediating wastewater in a bubble column bioreactor utilizing bacterial consortia. A comparative study was done on different growth media prepared using wastewater. The highest biomass yield of 3.66 g L was achieved with the highest removal efficiencies of 89.80, 77.30, and 80.77% for CO, SO, and NO, respectively. The study investigated pH, salinity, dissolved oxygen, and biochemical and chemical oxygen demand to assess their influence on the process. The nutrient balance validated the ability of bacteria to utilize compounds in flue gas and wastewater for biomass production. The Fourier Transform-Infrared Spectrometry (FT-IR) and Gas Chromatography-Mass Spectrometry (GC-MS) analyses detected commercial-use long-chain hydrocarbons, fatty alcohols, carboxylic acids, and esters in the biomass samples. The nuclear magnetic resonance (NMR) metabolomics detected the potential mechanism pathways followed by the bacteria for mitigation. The techno-economic assessment determined a feasible total capital investment of 245.74$ to operate the reactor for 288 h. The bioreactor's practicability was determined by mass transfer and thermodynamics assessment. Therefore, this study introduces a novel approach that utilizes bacteria and a bioreactor to mitigate flue gas and remediate wastewater.
烟气排放是工业过程中燃料燃烧产生的废气，会排放到大气中。这些相同的过程还会产生大量废水并排放到环境中。当前的研究旨在评估利用细菌群落的鼓泡塔生物反应器同时减少烟气排放和处理废水的可行性。对使用废水制备的不同生长培养基进行了比较研究。实现了最高生物量产量3.66 g/L，对CO、SO和NO的去除效率分别达到89.80%、77.30%和80.77%。该研究调查了pH值、盐度、溶解氧以及生化需氧量和化学需氧量，以评估它们对该过程的影响。营养平衡验证了细菌利用烟气和废水中的化合物进行生物质生产的能力。傅里叶变换红外光谱（FT-IR）和气相色谱-质谱（GC-MS）分析在生物质样品中检测到了商业用途的长链烃、脂肪醇、羧酸和酯。核磁共振（NMR）代谢组学检测到了细菌用于减排的潜在机制途径。技术经济评估确定了运行该反应器288小时的可行总资本投资为245.74美元。通过传质和热力学评估确定了生物反应器的实用性。因此，本研究引入了一种利用细菌和生物反应器减少烟气和处理废水的新方法。
