Decolorization of azo dyes with high salt concentration by salt-tolerant mixed cultures under anaerobic conditions

Because the lack of detailed study of biological decolorization in high salt dye wastewater, it is still difficult to evaluate the biological treatment on high-salinity dye wastewater. The experiments were carried out to study the salt-tolerant bacteria, which is useful in the treatment of high-salinity colored wastewater. Simulated wastewater containing 5-150 g/L salt （NaCI） and 50-2000 mg/L Reactive Brilliant Red K-2BP was treated with three salt-tolerant mixed cultures （CAS, TAS, DSAS）, which were under a gradually acclimated procedure. With the increase of concentrations of salt and dye, the decolorization became low. The abilities of decolorization of dyes wastewater by three mixed cultures （CAS, TAS, DSAS） were studied, CAS and DSAS mixed cultures showed more active for the treatment of high-salinity colored wastewater than TAS mixed cultures. The results suggested that there might be a simple process for the high salt wastewater treatment, which could be incorporated into conventional activated sludge plants.     

高盐条件下活性艳红K-2BP的生物脱色动力学模型研究

在高盐条件下,通过耐盐菌群对偶氮染料K-2BP废水厌氧降解动力学实验,模拟得出偶氮染料K-2BP和盐浓度对生物降解双重影响动力学模型.其抑制常数KIS和KT值分别为(329.5±175.8)mg/L和(39.7±27.1)g/L,并通过动力学模型预测的数据和实验数据对比,耐盐菌可用动力学模型描述其在高盐条件下对染料的降解.