超滤技术处理甘薯淀粉生产废水的应用效果

杨诗妮; 刘海华; 徐贞贞; 孔宪奎; 廖小军

doi:10.13386/j.issn1002-0306.2020090060

超滤技术处理甘薯淀粉生产废水的应用效果

Utilization of Ultrafiltration Technology in the Treatment of Sweet Potato Starch Production Wastewater

摘要

摘要: 为了选择适宜的超滤膜对甘薯淀粉废水进行处理，以3种甘薯淀粉废水为研究对象，比较了无机陶瓷膜N50、N100和N200以及有机膜PVDF和PES的膜通量及其处理效果。结果表明：膜通量在超滤进行到第15~25 min时下降明显，之后基本保持稳定，其中陶瓷膜N200与N50具有较高的稳定膜通量，有机膜PVDF膜通量高于PES。废液经处理后，透光性显著加强，可溶性固形物去除率为39.8%~64.6%、可溶性蛋白质去除率为73.7%~99.0%、化学需氧量降低32.3%~73.2%，其中N50、PVDF和PES处理效果更好。综合膜通量及运行成本指导实际生产，实际生产中宜用N50或PVDF对甘薯淀粉废水进行超滤处理，以减轻后续处理压力，提高废水中有机物质的回收利用。

Abstract: In order to select a suitable ultrafiltration membrane to treat sweet potato starch wastewater, five different ultrafiltration membranes, including three ceramic membrane (N50, N100 and N200) and two organic membrane (PVDF and PES), were selected to study their effects on three kinds of wastewater from the production process of sweet potato starch. The results showed that all membrane flux decreased significantly in the time of 15 to 25 minutes and then maintained basically stable, of which the ceramic membrane N200 and N50 had relatively high stable membrane flux and the membrane flux of PVDF was higher than that of PES. After ultrafiltration, the light transmittance of wastewater was increased significantly, the remove rates of soluble solids, soluble protein and COD were 39.8%~64.6%, 73.7%~99.0% and 32.3%~73.2%, respectively. The performance of membrane N50, PVDF and PES was better than others. Considering the membrane flux and separation effectiveness, the membrane N50 or PVDF was recommended for further reducing the pressure of subsequent treatment and improving the recovery and of organic compounds in wastewater.