油脂碱炼水洗废水用于酶法脱胶研究

对油脂碱炼过程中的水洗废水进行循环利用。将油脂碱炼废水进行离心分离，加入毛油中进行水化脱胶，脱出水化磷脂后，进一步进行酶法脱胶，脱出非水化磷脂。通过单因素试验与正交试验，确定废水酶法脱胶的最优工艺条件：水洗废水量2.5%，磷脂酶量30mg/kg，温度55℃，pH4.9，时间3h，搅拌速度90r/min。在最优条件下进行脱胶实验，测定脱胶油中的磷含量为4.9mg/kg，说明水洗废水可以替代软化水用于脱胶工序，每千克成品油可节省热量34～36kJ，提高得率0.2% 以上。

Application of Wastewater from the Alkaline Refining of Oil to the Enzymatic Degumming of Oil

In this study, the wastewater from the alkaline refining of oil was centrifugated, followed by the supernatant was then added to gross soybean oil for the removal of hydrated phosphatides, followed by further enzymatic degumming for the removal of non-hydrated phosphatides in order to achieve the recycle utilization of the wastewater. Based on single-factor and orthogonal array experiments, the optimal conditions for the enzymatic degumming with the wastewater were determined to be: wastewater loading, 2.5%; phospholipase A1 loading, 30 mg/kg; reaction temperature, 55 ℃; reaction pH, 4.9; and stirring speed, 90 r/min. The soybean oil degummed under the optimal conditions showed a phosphorus content of 4.9 mg/kg. This demonstrates that the wastewater from the alkaline refining of oil can be used as an alternative to softened water for the degumming of gross oil, and 34－36 kJ calorie will be saved during the production of 1 kg of finished oil but the yield will be increased by above 0.2%.