生物增强技术净化含铁、锰、氨氮微污染地下水

Bioaugmentation Technology for Purification of Micro-polluted Groundwater Containing Iron,Manganese and Ammonia Nitrogen

针对微污染地下水中铁、锰、氨氮浓度超标的问题，将已构建的5株具有同步去除铁、锰、氨氮效能的优势菌种应用于规模为1000 m^3／h的曝气／生物强化过滤系统中，通过进行菌种复配、富集培养、固定化试验对前期小试所建立的技术成果进行验证，并确定系统的最佳运行条件。针对试验水质，该工艺适宜的运行参数如下：启动期采用逐级增加滤速方式，稳定期滤速为4～5m／h，反冲洗周期为3～5d，反冲洗强度为12～15L／（m^2·S），曝气工艺的气水比为3～4，进水溶解氧应达到6.5～8.5mg／L。在此条件下，该工艺对铁、锰、氨氮都具有较好的去除效果。

In order to simultaneously remove iron, manganese and ammonia nitrogen from micropolluted groundwater, five bacteria strains were applied in an aeration/bioaugmentation filter system with capacity of 1 000 m^3/h. The bench test results were confirmed by strain composition, cultivation and immobilization. The optimal operation conditions were determined as follows： the filtration rate gradually increased in the start-up period, the filtration rate was 4 to 5 m/h, the backwashing period was 3 to 5 d, the baekwashing intensity was 12 to 15 L/（m^2.s）, the gas-water ratio was 3 to 4 and the dissolved oxygen content was 6.5 to 8.5 mg/L. Under these conditions, iron, manganese and ammonia nitrogen were removed effectively.