原位投菌技术修复微污染水源水的中试研究

针对水源水库的氮源污染和有机物污染问题,研究了原位投菌技术对微污染水源水的修复效果。实验在中试反应器中进行,所投加菌剂为贫营养好氧反硝化细菌。实验结果表明,在菌剂投加量为0.1 mg/L,溶解氧质量浓度为5～8 mg/L,水温为16～25℃的条件下,系统对水中主要污染物NO3--N、TN和CODMn均有较好的去除效果,质量浓度分别从1.68、2.25、5.50 mg/L降至最低值0.75、0.95、3.03 mg/L,最大去除率分别可达到57.5%、57.7%和44.9%。系统对水中氮源污染和有机物的去除效果均能够满足《地表水环境质量标准》中的Ⅲ类标准,实验结果表明,将原位投菌技术应用于微污染水源水体的水质改善是可行的。同时还探讨了贫营养好氧反硝化细菌的作用机理。

Pilot study on in-situ bacteria inoculation technology for restoration of micro-polluted source water

In order to solve the problem of nitrogen and organic pollution of source water reservoir effectively,the effects of in-situ inoculation technology for micro-polluted source water restoration were studied by dosing oligotrophic aerobic denitrifiers.The test result showed that when the bacteria dosage was 0.1 mg/L,DO mass concentration was 5~8 mg/L,and the water temperature was 16~25℃,the restoration effect of the water system was satisfactory.The mass concentration of NO-3-N,TN and CODMn was reduced from 1.68 mg/L,2.25 mg/L and 5.50 mg/L to 0.75 mg/L,0.95 mg/L and 3.03 mg/L,and the maximum removal rate could reach at 57.5%,57.7% and 44.9%,respectively.The removal effect of nitrogen and organics could meet the requirements of class Ⅲ of "environmental quality standards for surface water",which proves that in-situ bacteria inoculation technology applied in the quality improvement of micro-polluted source water is feasible.The function mechanism of oligotrophic aerobic denitrifiers was also discussed in this paper.