TSS对微孔过滤压损影响及滤芯再生研究

Effects of TSS on Pressure Loss of Micro-Filtration and Regeneration of Filtration Core

根据《关于压载水管理系统认可的导则》(G8)中对压载水岸基测试提出的要求,研究壁流式微孔陶瓷滤芯处理总悬浮物(TSS)浓度≥50mg/L水体时的有效性和可行性。讨论滤芯压强与滤芯累积处理水量的关系,6L滤芯压强上限为0.58MPa,累计处理水量5.4m3;20L滤芯停止运行前压强为0.2MPa,累积处理水量85m3。TSS浓度测定采用重量法(GB11901-89),6L滤芯、20L滤芯和初滤丝网对SS平均去除率分别为58%、12%、30%。滤芯再生采用单水反冲洗,反冲洗后滤芯压损基本得到恢复。通过扫描电镜测试得到粒径小于20μm的SS占总数的70%,滤芯对粒径小于75μm的SS去除效果明显。壁流式微孔陶瓷滤芯能够有效地拦截水体中的悬浮物,具有较长的使用寿命且再生简单快捷,可作为一级方法处理船舶压载水。

According to the requirements about ballast water onshore tests of Guidelines for approval of ballast water management system(G8),the stability and the effectiveness of the MPCF in treating water with the concentration of TSS ≥50mg/L have been investigated in this work. The relationships between pressure loss and treated volume of water were discussed. For a 6L filter,the continuous treated volume is 5.4m3 before the pressure increased to 0.58MPa. For a 20L filter,the threshold value of the pressure loss is 0.2MPa,and the accumulated volume of treated seawater reaches 85m3. Gravimetric method(GB11901-89) is adopted to determine the concentration of TSS. For the filtration of 6L,20L and primary screen filter,the average removal efficiencies are 58%,12% and 30% respectively. The water backwashing is utilized for the regeneration of the MPCF,and the pressure loss is almost recovered after the water backwashing. The samples of the suspended solids(SS) were tested by the scanning electron microscopy(SEM) ,and it can be seen that the SS with the diameter of less than 20μm account for 70%,and the MPCF has an obvious effect on removing the SS with the diameter of less than 75μm. The MPCF is available in intercepting the SS with long life span and convenient to be regenerated,which could be used as primary treatment for ballast water.