期刊
BIORESOURCE TECHNOLOGY
卷 357, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127318
关键词
Sponge iron; Nitrate removal; NDFO; Microbial community
资金
- National Natural Science Foundation of China [51768032]
Sponge iron-mediated nitrate-dependent ferrous oxidation (NDFO) process is a promising technique that can effectively reduce total nitrogen concentrations by providing Fe(II), achieving stable TN removal rates under certain conditions.
Sponge iron (SI) can serve as an indirect electron donor to provide Fe(II) for the nitrate-dependent ferrous oxidation (NDFO) process, producing OH- and magnetite. The SI-NDFO system mainly uses Fe(OH)(2) as an electron donor, achieving a TN reduction rate of 0.42 mg-TN/(gVSS.h) for a period of at least 90 days. The enrichment of iron-oxidizing bacteria and the competition of iron-carbon micro-electrolysis for reaction sites on the surface of SI are the main reasons for the improvement of total nitrogen removal efficiency (TNRE). With an influent NO3--N concentration of 50 mg/L and a SI concentration of 50 g/L (at pH 5.0 and 30 degrees C), the TNRE reached a maximum level of 38.28%. In addition, reducing the pH environment was found to improve the denitrification efficiency of the SI-NDFO system, although denitrification stability was also reduced as a result. Overall, the SI-mediated NDFO process is a promising technique.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据