硫酸盐还原菌的驯化及脱硫性能研究

Study on the Domestication and Desulphurization of the Sulfate-reducing Bacteria

对内蒙古某地工业污泥分离出的硫酸盐还原菌(sulfate-reducing bacteria,SRB)-DYB2菌种进行SO24-离子、电厂脱硫尾液的环境适应驯化并分别进行SO24-脱除试验。首先采用3000～9000mg/L的SO42-驯化DYB2,在38℃、pH值为7.2、菌株接种量为10%及厌氧条件下,72h后,溶液中SO24-的去除率为69.5%～76.9%,净去除量为2307～6255mg/L;改变菌株接种量,在38℃、pH值为7.2,处理含SO24-1000～4000mg/L的脱硫尾液。当接种量为20%时,SO24-1000mg/L去除率最高,达到83.3%,净去除量最高达到2140mg/L。结果表明,接种量相同,脱硫尾液中2SO4-浓度增加,净去除量增加,但去除率降低;同浓度SO42-脱硫尾液,接种量愈高,去除率与净去除量愈多。

Sulfate-reducing bacteria （SRB）-DYB2, which was isolated from the industrial sludge in Inner Mongolia, was domesticated in solution contain sulfate and desulfurization plant tail liquid, then used for removing sulfate experiment. At first, DYB2, inoculation at 10%, domesticated in 3 000,-9 000 mg/L SO2^4- solution, at 38℃, pH was 7.2, in anaerobic, after 72 h, sulfate removal rate was 69.5%～76.9%, net removal volume reached 2 307.6 255 mg/L. The DYB2 domesticated in 1 000～4 000 mg/L, desulfurization plant tail liquid, at 38℃, pH was 7.2, in anaerobic, after 72 h, inoculation changed from 5%～20%, used for removing sulfate. When Inoculation was 20%, the concentration of sulfate at 1 000 mg/L, the removal rate was 83.3%, net removal volume reached 2140mg/L. The result show that the net removal volume increases while the removal rate decreases with the increasing of sulfate concentration at the same inoculation, both removal rate and the net removal sulfate increases with the increasing of inoculation amount, at the same concentration of sulfate in the desulfuration plant tail liquid.