超滤法处理大豆蛋白废水及资源回收的研究

Soy protein wastewater treatment and resource reclamation with ultrafiltration

为净化大豆蛋白废水并回收有用资源,通过超滤中试研究,探讨了预处理方法、超滤膜截留分子量(MWCO)和各种操作参数的影响以及超滤膜的清洗效果,指出采用MWCO为1 kDa的聚砜膜可保证>90%的蛋白去除率和低于10%的低聚糖损失率,从而通过回收蛋白和低聚糖实现资源的回收.在45℃、压力差0.20 MPa以及10 L/s的进水流速下进行过滤,可获得较高的渗透通量和较长的运行时间.对于污染后的膜,采用NaOH和EDTA的混合液进行清洗,可以恢复膜原始通量的87%左右.

This pilot study on investigating the soy protein wastewater treatment and resource reclamation with uhrafihration involved the pretreatment strategies, effect of membrane molecular weight cut off （MWCO） and operating parameters as well as membrane cleaning technology. A polysulphone UF membrane with MWCO 10 kDa was selected in that its protein and oligosaccharides retain ratios were around 90% and 10% respectively. Temperature 45 ℃, TMP 0.2 MPa, feed velocity 10 L/s and pH 4.5 were recommended for ensuring the long term UF process at a relatively higher permeate flux. As to resuming the flux of UF after fouling, the combination of NaOH and EDTA was proved to be an ideal agent upon its flux recovery rate of 87%.