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以干酪素酶解产物为介质对膜分离进行了研究。讨论了碱性和中性条件下膜分离过程中膜两侧浓度、流通量 ( J)和总氮截留率 ( σ)的变化。发现 p H值低污染度高 ,截留分子量大的膜污染度大。用 0 .1 mol/L的氢氧化钠和 5m L/L的 84消毒液浸泡洗涤可使膜的水通量恢复 94 %。在干酪素水解液的超滤中 ,阻力主要来自于凝胶层。凝胶层的阻力比膜阻力大 1至 2个数量级。
Membrane separation was studied by using casein hydrolyzate as mediator. The changes of membrane concentration, flux (J) and total nitrogen rejection (σ) during membrane separation under alkaline and neutral conditions were discussed. It is found that the p H value is highly polluting and the membrane polluting is large with a large molecular weight cut-off. Washing with 0.1 mol / L sodium hydroxide and 5 mL / L 84 disinfectant restored membrane water flux by 94%. In the casein hydrolyzate ultrafiltration, the resistance comes mainly from the gel layer. The resistance of the gel layer is 1 to 2 orders of magnitude larger than the membrane resistance.