Characteristics about tolerance and reduction of bacteria CQMUXH-1 to Hexavalent Chromium / 重庆医科大学学报

ABSTRACT

Objective:Toresearch the characteristics about resistance and reduction on Cr(Ⅵ)ofCQMUXH-1. Methods:Simulating the environment of C(rⅥ)in the lab. Cultivating bacteria under different condition(reaction time,pH,temperature,C(rⅥ)concentration, other pollutants)and determining the growth quantity of bacteria and(or)concentration of residual Cr(Ⅵ)to evaluate the ability for tolerating and reducing C(rⅥ)of CQMUXH-1. Results:5~20 h is the logarithmic growth phase of CQMUXH-1 when cultured in 30℃ and vibration conditions. The resistant ability to Cr(Ⅵ)of CQMUXH-1 is better than the E. coli DH5? control bacteria. The reduction rate of CQMUXH-1 to 100 mg/L Cr(Ⅵ)is 73% when cultured in 37℃,200 r/min after 84 h. The weak base environment has bad effects to the growth of CQMUXH-1 and 37℃ can speed up its growth. Hg2+,As3+ can obviously restrain the growth of CQMUXH-1 and Cu2+ can promote its growth. Conclusion:CQMUXH-1 has strong ability to resist and reduce Cr (Ⅵ),which can be effectively used in the bioremediation of waste water with Cr(Ⅵ)pollution.