| Yellow phosphorus is very important chemical products; produce yellow phosphorus by electric furnace will produce a lot of yellow phosphorus tail gas. The main composition of yellow phosphorus tail gas is, carbonic oxide is precious industrial chemicals, can produces various chemical products. The mainstream of yellow phosphorus tail gas utilization is removing impurities and makes use of purified tail gas to develop one-carbon chemical. But now the main way of treat tail gas is burning. This way not only waste carbonic oxide and pollute the environment. Other purification methods of tail gas like:water-washing; temperature swing adsorption; pressure swing adsorption; catalytic oxidation etc; is not perfect. Use microbe purify Industrial emissions is rise new method in recent years, this way has advantage of energy consumption, simple equipment, etc. But now there is no paper about use microbe purifies yellow phosphorus tail gas. A dominant desulfurization bacterium, which were found from city sewage treatment plant by inductive domestication with in simulation yellow phosphorus tai gas which mixed with H2S and CO, make study on desulfurization and removing H2S in carbonic oxide atmosphere. The experimental study applied basis date for purify yellow phosphorus tail gas by microbe.It selected foul water from aerobic pond and anaerobic pond of city sewage treatment plant as experimental bacteria source. The experimental study on domestication of the two bacteria source in carbonic oxide show that there have bacteria which can fit the atmosphere and can removing part H2S in the two bacteria source after domestication five day. Through the comparison of biochemical removal to gas and degradability of H2S in water, the bacteria source from anaerobic pond is easier domestication and the degradability of H2S in solution is better than the bacteria source from aerobic pond. The best temperature for remove H2S in aqueous solution of the dominant desulfurization bacterium is about 23℃; the appropriate concentration of H2S is about 46mg/L; the appropriate pH is about 7; the best additive amount of nutrient solution is 20mL/L. The experimental study also shows that kinetic equation of removing H2S in solution content M-M equation. During 17～23℃, M-M equation can simplify formula, the activation energy of removing H2S is 60.03 (KJ/mol); the pre-exponential factor is A=9.4323×108 (h-1)When inlet load is about 0.014m3/h, the concentration of H2S between 180-230mg/m3, bacterial liquid circulation is 1.5L/h, the temperature is about 20℃, use the domestication bacteria inoculation bio-packing filtration tower continuous culture for biofilm. After 12 days continuous culture, the efficiency of removing H2S is above 80%; after 16 days continuous culture, the efficiency of removing H2S is 100%. The efficiency of removing is stable to 20days.When the concentration of H2S in the simulation of yellow phosphorus tall gas is 181mg/m3, bacterial liquid circulation rate is 1.38L/h, bacterial liquid temperature is 19.0℃.If intake load is less than 0.0015m3/h, purification efficiency of the bio-packing filtration tower to 100%,and if intake load is 0.004m3/h, purification efficiency keep at 98%.When the concentration of H2S in the simulation of yellow phosphorus tall gas is 1450 mg/m3, bacterial liquid Circulation rate is 1.42L/h. If intake load is less than 0.0007 m3/h, purification efficiency keep at 94%, if intake load more than 0.0029m3/h, purification efficiency dropped to 86%.When intake load between 0.0032 0.0037m3/h, purification efficiency dropped to 61%-76%.The larger and smaller bacterial liquid circulation rate are both adverse for purify simulation of yellow phosphorus tall gas in the bio-packing filtration tower, appropriate bacterial liquid Circulation rate is 3.5L/h-4.2L/h. Excessive acidity is adverse for desulfurization, suitable pH value is 6.4-7.2. |
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