基于硫循环的烟气生化脱硫及硫磺回收的过程机理

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Abstract Based on the geochemical cycle of elemental sulfur, the reaction mechanism and product morphology of reductive sulfide produced by biochemical metabolism of Sulfate-Reducing Bacteria (SRB) and sulfite were systematically studied. In biochemical desulfurization of flue gas (biochemical system), the largest sulfur yield (more than 40%) achieved at pH=(4.04±0.10) and ORP=(-134±17mV), but the optimal conditions for sulfur production in SO₂(aq)-S^2-(aq) system were pH=(3.99±0.21), ORP=(-159±40mV) and 1:1 molar ratio of SO₃^2- to S². In addition, the reaction of sulfur production of S₂O₃^2- with S^2- was a side reaction, which was beneficial to the production of sulfur. Sulfur consumption under near-neutral conditions was attributed to the production of polysulfide and polysulfate. The solid products of SO₂(aq)-S^2-(aq) system and biochemical system were characterized as the spherical high-purity orthorhombic sulfur. The sulfur produced in the biochemical system was adhered by the extracellular polymer.

Key words： flue gas desulfurization sulfate-reducing bacteria sulfur recovery sulfur cycle

Received: 20 August 2018

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X511

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	Articles by authors
	WU Xi
	HU Xue-wei
	NING Ping
	DANG Ya-xin
	ZHANG Kai

Cite this article:

WU Xi,HU Xue-wei,NING Ping等. Biochemical desulfurization of flue gas and process mechanism of sulfur recovery based on sulfur cycle[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 954-959.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/954

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