高盐条件下偶氮染料兼氧生物降解性能研究

Study on Facultative Anaerobic Biodegradation Performance of Azo Dyestuff under High Salt-containing Condition

研究活性染料与不同浓度葡萄糖在共基质条件下的兼氧生物降解性能,在此基础上,研究K-2BP在不同盐浓度条件下的兼氧生物降解性能.选择K-2BP作为目标污染物进行静态反应器生物降解试验,结果表明:兼氧微生物在只有K-2BP作为基质时对染料的降解率较低;葡萄糖存在时,能提高兼氧生物对染料的降解能力,葡萄糖为800 mg/L时,6 h染料降解率为64.1%,而葡萄糖浓度为1 000 mg/L时,不利于染料降解,6 h染料降解率为46%,与不投加葡萄糖情况的降解率接近.葡萄糖浓度为800mg/L,盐浓度分别为2,5,10和20 g/L,其一级降解动力常数分别为0.105 78,0.049 47,0.028 69,0.022 75 mg/L.h;半衰期分别为6.99,14.15,22.55,30.21 h.随盐浓度梯度升高,染料的兼氧降解动力学常数逐渐降低,当盐浓度超过2 g/L时,会抑制兼氧微生物对染料的降解.

The facultative biodegradation performance of reactive dyestuffs is studied by using different concentrations glucose as co-substrate.Based on this,the facultative biodegradation performance of K-2BP under different salt-containing condition was investigated by static test reactor.The results indicated that facultative microorganisms had lower degradation rate when only K-2BP was used as the substrate,and the degradation rate would be increased under the existence of the glucose.The glucose concentration is 800 mg/L,while the degradation rate of K-2BP is 64.1% at 6h.However,it is detrimental to dye＇s biodegradation when the glucose concentration is up to 1000 mg/L,the degradation rate is only about 46%,that is similar to the condition without glucose.On the premise of glucose concentration 800 mg/L,when the salt concentrations are 2 g/L、5 g/L、10 g/L and 20 g/L respectively,the first-order kinetics constants are 0.10578 mg/L·h、0.04947 mg/L·h、0.02869 mg/L·h and 0.022 75 mg/L·h respectively.And the half-lives were 6.99 h、14.15 h、22.55 h and 30.21h respectively.The reaction rate constants decrease gradually with the increase of the salt concentrations,and when the salt concentration is more than 2g/L,it can restrain the facultative microorganisms＇ degradation of K-2BP will be restrained.