螺旋形中空纤维超滤膜处理高浓度废水时Dean旋流对膜污染阻力的削弱作用

Effect of Dean vortices on reducing the membrane fouling resistance in the treatment of high concentration wastewater with UF process

根据Dean旋流原理，以洗毛废水为高浓度废水，用螺旋形中空纤维超滤膜研究透膜压差、膜面流速、料液浓度、Dean参数等对膜污染阻力的影响．结果表明：在50℃，透膜压差△P为80kPa，膜面流速V为0．68m／s，螺距b为5mm，螺径dc为25mm，处理水质为CODcr46365mg／L、羊毛脂12g／L、pH=8．0、总固体浓度20158mg／L时，螺旋形膜透过液通量J是直形膜的1．6～1．96倍，阻力Rf比直形膜降低60％以上．在Dean参数的构成中，提高试验温度和减小螺距对膜污染阻力的削弱效果最为显著．

The wool processing wastewater was treated with coiled hollow fiber ultrafiltration membranes based on the principle of Dean vortex. The effects of transmembrane pressure, feed velocity, feed concentration, and Dean parameters on membrane fouling resistance were investigated. The results show that the membrane fouling resistance of a coiled membrane module is less than 60 % and the permeate flux is 1.6 ～ 1.9 times of a straight one when the conditions are： temperature of 50 ℃, trans- membrane pressure of 80 kPa, feed velocity of 0.68 m/s, the pitch of the coiled module of 5 ram, the diameter of the coiled module of 25 mm, and the treated water quality is： COD of 46 365 mg/L, lanolin of 12 g/L, pH 8.0, and the total solid concentration of 20 158 mg/L. Moreover, an increase in temperature and a decrease in the pitch of the coil are useful in reducing membrane fouling resistance.