氨氮与亚硝酸盐对含铁锰地下水生物净化影响

Influence of ammonia and nitrite on performance of Fe and Mn removal by biofilter

摘要:

为明确氨氮与亚硝酸盐氮对生物除铁锰性能及锰氧化细菌(MnOB)的影响,采用具有成熟除铁锰能力的中试生物滤柱与SBR反应器进行实验．结果表明：氨氮与亚硝酸盐均不影响滤柱除铁效果;进水亚硝酸盐氮质量浓度为0.1,0.2,0.3和0.7 mg／L时,滤柱除锰效果不受影响,SBR实验结果进一步表明亚硝酸盐能促进MnOB氧化锰能力;氨氮的存在可抑制MnOB氧化锰能力,但对成熟滤柱,进水氨氮质量浓度为1.2,2.2 mg／L时,这种抑制作用不能恶化除锰效果,直至氨氮质量浓度提高至4.5 mg／L时,出水锰质量浓度开始超标．对于生物滤池的启动,可首先接种硝化细菌至硝化过程建立之后,再接种MnOB以减弱氨氮对其的不利影响．

Abstract:

The pilot-and lab-scale reactor was constructed, respectively, to evaluate the influence of ammonia and nitrite on the performance of Fe and Mn removal. The results of pilot-scale filter indicated that the nitrite concentration of 0.1,0.2,0.3,0.7 mg／L, had no effects on Fe and Mn removal, as well the ammonia concentration of 1.2 and 2.2 mg／L. However, the ammonia concentration about 4.5 mg／L would inhibit the Mn removal, resulting in higher Mn in effluent than requirements; The lab-scale SBR experiments demonstrated that the activity of Mn oxidizing bacteria(MnOB) was enhanced by nitrite, but inhibited by ammonia, which showed the importance of nitrification in biological removal of Fe, Mn and ammonia process, especially in the period of start-up.