氨氮复合污染含铁、锰地下水生物净化工程的启动运行

Start-Up and Operation of Biological Purification Project of Iron and Manganese Containing Groundwater Polluted by Ammonia Nitrogen

近年来,氨氮复合污染含铁、锰地下水的净化成为研究热点,铁、锰、氨氮各自的氧化特性造成功能微生物在滤层中争夺溶解氧(DO)和生存空间,给除锰生物滤层的培养与运行造成较大影响。工程采用无阀滤池基于双层滤料成功实现了铁、锰、氨氮的一级生物净化。文中介绍了工程概况、生物滤层的培养过程以及铁、锰、氨氮的去除过程,并追踪了生物滤层中磷酸盐的去除情况。研究结果表明:不到两周净化滤层达到了进水中Fe;的深度去除,出水总铁含量稳定在0.2 mg/L以下;不到两个月氨氮和锰实现稳定去除,出水Mn;含量小于0.1 mg/L,氨氮含量在0.2 mg/L左右;进水中的磷酸盐在滤层中由于铁氧化物的吸附得到深度净化,出水含量低于10μg/L。

In recent years,the purification of groundwater contaminated by iron,manganese and ammonia nitrogen has become a research hotspot.Due to the different oxidation characteristics of iron,manganese and ammonia nitrogen,the functional microorganisms compete for dissolved oxygen(DO)and living space in filter,which greatly affects the culture and operation of biological filter.In this project,valveless filter was used to realize the one-stage biological purification of iron,manganese and ammonia nitrogen based on double-layer filter.This paper introduced the general situation of project,the cultivation process of biofilter,the removal process of iron,manganese and ammonia nitrogen,and the removal of phosphate in the biofilter were also mentioned.Results showed that in less than two weeks,purification filter layer has achieved the deep removal of Fe;in influent,and total iron concentration in effluent was below 0.2 mg/L.In less than two months,ammonia nitrogen and manganese had achieved stable removal,and Mn;concentration in the effluent was less than 0.1 mg/L,concentration of ammonia nitrogen around 0.2 mg/L.Phosphate in the influent was deeply purified in filter layer due to the adsorption of iron oxide,and concentration in effluent was lower than 10μg/L.