Biological Sulfur Reduction To Generate H2S As a Reducing Agent To Achieve Simultaneous Catalytic Removal of SO2 and NO and Sulfur Recovery from Flue Gas

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Abstract
The conventional flue gas treatment technologies require high capital investments and chemical costs, which limit their application in industrial sectors. This study developed a sulfur-cycling technology to integrate sulfide production by biological sulfur reduction and simultaneous catalytic desulfurization and denitrification with H2S (H2S-SCDD) for flue gas treatment and sulfur recovery. In a packed bed reactor, high-rate sulfide production (1.63 ± 0.16 kg S/m3-d) from biological sulfur reduction was achieved using organics in wastewater as electron donors at pH around 5.8. 93% of sulfide in wastewater was stripped out as H2Sg, which can be a low-cost reducing agent in the H2S-SCDD process. Over 90% of both SO2 and NO were removed by the H2S-SCDD process under the test conditions, resulting in the formation of sulfur. 88% of the input S (H2Sg and SO2) were recovered as octasulfur with high purity. Besides partial recycling to produce biogenic sulfide, excessive sulfur can be obtained as a sellable product. The integrated sulfur-cycling technology is a chemical-saving and even profitable solution to the flue gas treatment in industrial sectors with wastewater available.
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Funding Information
  • Guangdong Provincial Department of Science and Technology (2016A050503041, 2017B050504003)
  • National Natural Science Foundation of China (51638005)

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