A method for synchronous biochemical removal of SO2 and Hg in flue gas
A flue gas and biochemical technology, applied in chemical instruments and methods, separation methods, anaerobic digestion treatment and other directions, can solve the problems of complex process, inability to recover sulfur resources, large consumption of chemicals and energy, etc., and achieve simple reaction process, Achieve the effect of resource recovery and elimination of secondary pollution
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Embodiment 1
[0029] Such as figure 1 As shown, the flue gas of a power plant boiler contains SO 2 : 3500mg / m 3 , Hg: 1.2mg / m 3 .
[0030] (1) Use a dust collector to remove dust from the flue gas, and then use a heat exchanger to recover heat to reduce the temperature of the flue gas to 120°C;
[0031] (2) Rinse the flue gas with biochemical treatment effluent (first rinse with water to start the reaction) for 5s, SO 2 and Hg and S in biochemically treated effluent 2- and H + HgS and sulfur will react to form HgS and sulfur. The concentration of sulfite in the eluate is 1850mg / L, and the mercury removal efficiency is more than 90%. recycling;
[0032] (3) Pass the eluent into the anaerobic reactor loaded with sulfate-reducing bacteria and carbon source, the reactor uses anaerobic activated sludge, and the sulfate-reducing bacteria species is Desulfovibrio desulfuricans of the genus Desulfovibrio species, the carbon source is artificially prepared culture medium, including 0.015~0....
Embodiment 2
[0034] Such as figure 1 As shown, the flue gas of a steam boiler in an iron smelting plant contains SO 2 : 2500mg / m 3 , Hg: 1.5mg / m 3 .
[0035] (1) Use a dust collector to remove dust from the flue gas, and then use a heat exchanger to recover heat to reduce the temperature of the flue gas to 165°C;
[0036] (2) Rinse the flue gas with biochemical treatment effluent (first rinse with water to start the reaction) for 3s, SO 2 and Hg and S in biochemically treated effluent 2- and H + HgS and sulfur will react to form HgS and sulfur. The concentration of sulfite in the eluate is 2000mg / L, and the mercury removal efficiency is more than 80%. recycling;
[0037] (3) Pass the eluate into the anaerobic reactor loaded with sulfate-reducing bacteria and carbon source. The reactor adopts a granular sludge expanded bed (EGSB) structure, and the sulfate-reducing bacteria species are Desulfurizers Desulfobacter postgatei species, the carbon source is crop wastewater, the volume r...
Embodiment 3
[0039] Such as figure 1 As shown, the flue gas of a coal-fired boiler in a glass factory contains SO 2 : 2600mg / m 3 , Hg: 1.7mg / m 3 .
[0040] (1) Use a dust collector to remove dust from the flue gas, and then use a heat exchanger to recover heat to reduce the temperature of the flue gas to 145°C;
[0041] (2) Rinse the flue gas with biochemical treatment effluent (first rinse with water to start the reaction) for 2s, SO 2 and Hg and S in biochemically treated effluent 2- and H + HgS and sulfur will react to form HgS and sulfur, the concentration of sulfite in the eluent is 2200mg / L, and the mercury removal efficiency is more than 85%. recycling;
[0042] (3) Pass the eluate into the anaerobic reactor loaded with sulfate-reducing bacteria and carbon source. The reactor adopts upflow anaerobic sludge bed (UASB), and the sulfate-reducing Desulfobacterium indolicum species of the genus Bacillus, the carbon source is fermentation wastewater, the volume ratio of SRB to el...
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