摘要
从某热电厂钠法脱硫废水出水口处所取污泥中,通过筛选、分离、逐级驯化得到1株在高盐环境下对还原性无机硫化合物具有较高生物氧化能力的优良菌株Z-2。对菌株的耐高盐性能进行了研究,并对其培养条件进行了优化。结果表明,当NaCl质量浓度为10～20g/L时,对菌株的生长以及生物氧化能力没有影响,氧化率达到90%;NaCl质量浓度为30g/L时,菌株依然有一定耐受能力,氧化率为70%;NaCl质量浓度增高至40g/L时,菌株的生长和还原性硫的氧化完全受到抑制。菌株Z-2的最优培养条件为:氮源(NH4)2SO42g/L,初始pH 7.5,温度35℃。在此条件下,菌株Z-2对相当于实际废水含量(Na2SO370g/L、Na2S2O310g/L、NaCl 20g/L)的还原性无机硫化合物的氧化率高达95%。
A strain Z-2 is originally obtained from sodium desulfurization wastewater and underwent domestication step by step to adapt to high salt content solution. Z-2 is capable of bio-oxidating inorganic sulphuric compound. When NaCl concentrations are 10-20 g/L and 30 g/L, the biological oxidation rate of Z-2 are 90% and 70% respectively. The bioactivity and ability for oxidating sulphuric is completely inhibited when salt content reaches 40 g/L. The optimum cultivation condition of Z-2 are initial pH value of 7.5, temperature of 35℃ and ammonium sulfate concentration of 2 g/L. Under this condition, the oxidation rate for the actual wastewater equivalent inorganic sulphuric compound （Na2SO3 70 g/L, Na2S2O3 10 g/L and NaCl 20 g/L） is higher than 95%.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期94-100,共7页
Journal of Chongqing University
基金
国家环保部环保公益性行业科研专项资助(201209013)
关键词
脱硫
菌株
高盐
生物氧化
desulfurization
strain
high salt
biological oxidation
