摘要
亚铁离子可以作为电子供体参与反硝化作用,某些微生物可以通过氧化亚铁离子还原硝酸盐,从而去除污水中的硝态氮.本研究通过在潜流人工湿地中添加Fe2+,分析不同初始Fe2+浓度对反硝化过程的强化效果及不同C/N对Fe2+参与反硝化作用的影响.结果表明,Fe2+的添加可以显著提高人工湿地反硝化能力,进水NO-3-N为30 mg·L-1、C/N为2、水力停留时间为1 d,添加45 mg·L-1Fe2+的人工湿地中硝氮去除率可以提高24%;硝氮去除率随初始Fe2+浓度的增加而增加.C/N与初始Fe2+浓度对反硝化作用都具有显著影响且两者具有交互作用,碳源的存在可以促进Fe2+参与的反硝化作用.
Fe^2＋can participate in denitrification as electron donor. Some microorganisms can use the electron which is given by oxidizing Fe^2＋to Fe3 ＋to reduce NO-3or NO-2. In present study,the influences of external Fe^2＋on denitrification for different C / N ratio in subsurface flow constructed wetlands were studied. Results showed that the external Fe^2＋remarkably improved denitrification in constructed wetlands. Nitrate removal rate increased by about24% by adding 45 mg·L- 1Fe^2＋in the constructed wetlands under the condition of 30 mg·L- 1nitrate in influent,C / N = 2 and 1 d of HRT. With the increasing of initial concentration of Fe^2＋,the removal capability of NO-3-N presented a rising trend. Besides,there was an interaction between C / N and the initial concentration of Fe^2＋,which both had significant effects on denitrification. Carbon source promoted the denitrification that Fe^2＋participated in.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第2期557-563,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51309503)~~
