Simultaneous removal of carbon dioxide, sulfur dioxide and nitric oxide in a biofilter system: Optimization operating conditions, removal efficiency and bacterial community
Journal
Chemosphere
Journal Volume
276
Date Issued
2021
Author(s)
Abstract
Anthropogenic NOx, SO2 and CO2 emission from the fossil-fuel-fired power plants has aroused growing attention. This study investigated the removal performance of CO2, SO2 and NOx in flue gas as well as conversion efficiency of nitric- and sulfur-compounds in liquid phase in a biofilter. In order to develop the potential of the biofilter, simulative industry wastewater was employed as the spray solution. The satisfactory flue gas removal performance (75.23% CO2, 100% SO2 and 82.81% NO) were achieved under the optimal operating conditions of biofilter: initial solution pH of 9 and liquid-gas ratio (L/G) of 3. The gas film mass transfer coefficients (kGa) results showed that the resistance of gas mass transfer was decreased with increasing the pH value and L/G ratio, respectively. The final transformation product of NO was mostly N2 while about 78% SO2 was converted to elemental sulfur. The microbial community analysis results showed that the relative abundance of bacteria with denitrification capacity was increased by 3.05% which might have contributed to the conversion of NO intermediates products in present study. Collectively, this biofilter system achieve a better flue gas removal performance via the proper operation system, which provides an economic feasible strategy of flue gas purification and increases potential for industrial application. ? 2021 Elsevier Ltd
Subjects
Air purification; Bacteria; Biofilters; Carbon dioxide; Denitrification; Desulfurization; Efficiency; Flues; Fossil fuel power plants; Fossil fuels; Gas plants; Liquefied gases; Mass transfer; Nitric oxide; Nitrogen oxides; Sulfur dioxide; Desulphurization; Gas film mass transfer coefficient; Gas ratio; Gas removal; NO$-x$; Operating condition; Removal performance; Simultaneous removal; SO$-2$; System optimizations; Flue gases; carbon dioxide; dissolved oxygen; fossil fuel; nitric oxide; polyethylene; sulfur; sulfur dioxide; nitric oxide; bacterium; biofiltration; carbon dioxide; microbial community; nitric oxide; operations technology; optimization; pollutant removal; power plant; sulfur dioxide; Article; chemical oxygen demand; controlled study; desulfurization; empty bed residence time; flue gas; gene sequence; granular sludge; heavy metal removal; microbial community; municipal wastewater; nitrite reducing bacterium; nonhuman; pH; principal component analysis; seed sludge; sulfate reducing bacterium; suspended particulate matter; bacterium; electric power plant; genetics; Bacteria (microorganisms); Bacteria; Carbon Dioxide; Nitric Oxide; Power Plants; Sulfur Dioxide
Type
journal article