染料类型对膜生物反应器性能的影响

Influence of dye type on the performance of membrane bioreactor

为了考察染料类型对膜生物反应器(MBR)处理性能的影响,在相同的染料浓度条件下,探究了阳离子染料MB和阴离子染料CR对MBR去除效果、活性污泥特性及膜污染的影响。结果表明,MBR对亚甲基蓝印染废水中的COD、NH^(+)_(4)-N和亚甲基蓝的去除率分别为83.07%、25.11%和52.26%,均低于处理刚果红印染废水中的相应污染物去除率(88.93%、87.44%和92.39%)。前者系统中污泥代谢产物为71.43 mg·g^(−1),高于后者的35.22 mg·g^(−1),且D_(50)为110.9μm,导致系统分别在第10和17天的TMP达到清洗压力。扫描电子显微镜、阻力分析和红外光谱表征结果表明,处理亚甲基蓝印染废水的MBR滤饼层较厚(137μm),膜孔阻力较大(9.01%),污染物主要成分为多糖和蛋白质。

In order to investigate the effect of dye types on the performance of membrane bioreactor(MBR),at the same dye concentrations,the effects of cationic dye MB and anionic dye CR on MBR removal efficiency,activated sludge characteristics and membrane fouling were studied.The results showed that the removal rates of COD,NH^(+)_(4)-N and methylene blue were 83.07%,25.11%and 52.26%by MBR treating printing and dyeing wastewater with methylene blue,respectively,which were all lower than 88.93%,87.44%and 92.39%by MBR treating printing and dyeing wastewater congo red.The sludge metabolite of the former system was 71.43 mg·g^(−1),being higher than 35.22 mg·g^(−1)of the latter system,and the D_(50)was 110.9μm,which caused the system TMP reaching the cleaning pressure on the 10th and 17th day,respectively.The results of scanning electron microscope,resistance analysis and infrared spectroscopy showed the filter cake layer of MBR treating printing and dyeing wastewater with methylene blue was thicker(137μm),the membrane pore resistance was larger(9.01%),and the main contaminants were polysaccharides and proteins.