低压直流电场作用下鱼糜漂洗废水中蛋白质聚集回收效果

Effects of Low-voltage Direct Current Electric Field on Aggregation and Recovery of Protein in Surimi-rinsed Wastewater

摘要:

以鱼糜漂洗废水为对象，研究低压直流电场作用下废水中蛋白质聚集回收效果。结果表明，随着电场电压、处理时间、漂洗废水的初始温度和盐质量分数的增大，漂洗废水中蛋白质回收率先显著增大（P<0.05）后趋于平缓或下降，而随着极板间距从3 cm增加到15 cm时，蛋白质回收率显著下降（P<0.05），浊度也在3 cm时有最小值（0.16）。进一步将极板间距设定为3 cm，通过Box-Behnken响应面分析法优化回收条件，并建立了蛋白质回收率预测模型，获得鱼糜漂洗废水中蛋白质回收的最优参数为电场处理时间34 min、电场电压55 V、初始温度22 ℃、漂洗时盐的质量分数0.06%。该条件下漂洗废水蛋白质回收率达92.23%，显著高于热絮凝处理组（66.35%）（P<0.05），化学需氧量（Chemical Oxygen Demand, COD）去除率为89.54%，约为热絮凝处理组（49.38%）的1.81倍，回收效果显著高于热絮凝处理组（P<0.05）。综上所述，低压直流电场处理有助于鱼糜漂洗废水中蛋白质的聚集回收，该研究为鱼糜漂洗废水的蛋白质回收提供了新思路。

Abstract:

Protein aggregation and recovery in surimi-rinsed wastewater under the influence of a low-voltage direct current (DC) electric field were investigated. As the electric field voltage, treatment time, initial temperature of the wastewater, and mass fraction of salt in the wastewater increase, the protein recovery rate significantly increases initially (P<0.05), but then tends to level off or decrease. Meanwhile, as the electrode spacing increases from 3 cm to 15 cm, the protein recovery rate significantly decreases (P<0.05). In addition, the turbidity reaches its minimum (0.16) when the electrode spacing is 3 cm. With the help of the Box-Behnken response surface methodology, the optimal parameters for protein recovery were determined using an electrode spacing of 3 cm. At the same time, a protein-recovery prediction model was established. The optimal parameters are as follows: an electric field treatment time of 34 minutes, electric field voltage of 55 V, initial wastewater temperature of 22 °C, and a salt mass fraction of 0.06%. Under these conditions, the protein recovery rate from the rinsed wastewater reaches 92.23%, significantly higher than that of the thermal coagulation treatment group (66.35%) (P<0.05). Furthermore, the chemical oxygen demand removal rate is 89.54%, approximately 1.81-fold that of the thermal coagulation treatment group (49.38%). The recovery performance of the electric field treatment group is significantly better than that of the thermal coagulation treatment group (P<0.05). In conclusion, low-voltage DC electric field treatment enhances the aggregation and recovery of protein in surimi-rinsed wastewater. This study provides new ideas for protein recovery from wastewater.