给水厂生物活性炭更换方式评价

Evaluation of BAC replacement method in drinking water treatment plant

基于给水厂活性炭更换需求,从炭种及换炭方式两个方面考察了压块炭与柱状炭及更换时新炭的填充比例对活性炭的物理性能、污染物去除效果及微生物生长情况的影响.结果表明,压块炭与柱状炭在对小分子物质的吸附能力及强度方面差距不大.相比于柱状炭,压块炭上的灰分累积速率更高,孔容积下降得更快.新压块炭及柱状炭较旧炭对耗氧量(CODMn)去除率分别提升了22.1%和16.4%;其中压块炭对CODMn及三卤甲烷生成势(THMFPs)的去除效果优于柱状炭;且随着新炭填充比例的增加,炭柱对CODMn及THMFPs的去除率逐渐升高.16s测序结果显示柱状炭上的菌群丰度高于压块炭,降低新炭的填充比例有助于提升微生物多样性.相比于新炭填充比例的变化,活性炭种类的改变更能引起上方微生物群落发生聚类上的差异.酸杆菌门、拟杆菌门及浮霉菌门在柱状炭中占比均高于压块炭,是柱状炭上微生物多样性较高的主要原因.

Based on the requirements of biological activated carbon(BAC) replacement in drinking water treatment plant, the influence of briquetting BAC,columnar BAC and the proportion of new BAC in the replacement of new BAC on the physical properties,pollutant removal efficiency and microbial growth of BAC were investigated from the aspects of the kind of BAC replaced and the method of BAC replacing.The result shows briquetting BAC and columnar BAC have little difference in the adsorption capacity of small particles.Compared with columnar BAC,briquetting BAC has higher ash accumulation rate and quicker pore volume descent.The CODMn removal rate of new briquetting and columnar BAC is 22.1% and 16.4% higher than that of old BAC.The CODMn and trihalomethane formation potential(THMFPs) removal efficiency of briquetting BAC is higher than that of columnar BAC.With ratio of new BAC in old one increasing,the removal rate of CODMn and THMFPs increases.According to the 16 s sequencing analysis,the abundance of the bacteria on the columnar BAC is higher than that on the briquetting BAC,and decreasing the filling amount of the new BAC is able to improve microbial diversity.Compared with the change of the new BAC filling ratio,the change of the BAC kind is more capable of causing the clustering difference of the microbial community.The proportion of Acidobacteria,Bacteroidetes and Planctomycetes on columnar BAC is higher than that on Briquetting BAC,which is the main reason for the high microbial diversity on columnar BAC.