填充新型抗菌PVA小球的固定柱床的应用

通过优化的PVA-H₃BO₃包埋法制备了抗菌PVA小球，并用新制备的小球填充柱床进行水处理研究. 结果表明:抗菌PVA小球具有良好的杀菌性能，在杀生剂添加量为m(杀生剂)∶m(PVA)3∶2时，杀菌率达到(92±2)%；扫描电子显微镜显示，包埋了杀生剂的抗菌PVA凝胶小球是一种多孔性的球形颗粒，结构较密实，并且包埋效果理想. 随着填充高度的升高、处理液与抗菌材料接触时间(停留时间)的延长、处理液出口端流量的减小, 填充柱的杀菌性能逐渐升高；对于30mm×300mm的填充柱，当填充高度≥20cm, 停留时间≥0.5 h,出口端流量为2.7 mL/s时, 杀菌效果较好. 对于50mm×500mm的填充柱，在填充高度为10 cm，停留时间为0.5 h,出口端流量为2.7 mL/s时，其杀菌率为(93±1)%. 

Research of the Novel Column Apparatus Filled by the PVA Balls with Biocidal Activities

The novel high-molecular-weight biocide was immobilized into a polymeric matrix consisting of poly vinyl alcohol (PVA) hydrogel to form small PVA balls with biocidal capabilities. Their biocidal activities were evaluated. Experiments show that when the PVA balls dosage is 10 mg/mL, the bactericidal ratereaches (92±2)%. The scanning electron microscope (SEM) results of the PVA balls reveal that they are some porous sphericity solid which has close-grained structureand is filled well. To apply to circulating cooling water treatment more effectively, a column apparatus was devised by biocidal PVA balls, and some parametersof the column apparatus were researched such as length of filled column, treating time of water and outflux, etc. As far as the 　30　mm×300 mm column apparatus is concerned, the better applying is that filling length exceeds 20 cm; contacting time is beyond 0.5 h and outflux is 2.7 mL/s. As for the 　50 mm×500 mm column apparatus, the bactericidal rate reaches (93±1)% when filling length is 10　cm; contacting time is 0.5 h, and outflux is 2.7 mL/s. The study indicates that a column apparatus made by the PVA balls with biocidal activities is a very feasible and effective measure in circulating cooling water treatment.