期刊
PROCESS BIOCHEMISTRY
卷 101, 期 -, 页码 230-236出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2020.11.012
关键词
Sponge iron; Zero-valent iron; Biological sponge iron system; Aniline; Fenton-like
资金
- National Natural Science Foundation of China [51768032]
The application of zero-valent iron (ZVI) coupled with microorganisms has shown promising results in eliminating recalcitrant organic matters from wastewater. The biological sponge iron system (SFe-M) was found to be significantly more effective than the general activated sludge system in treating aniline (AN) wastewater. The system induced Fenton-like reactions, leading to the production of hydroxyl radicals (center dot OH) that attacked the benzene ring and the amino group in AN.
The application of zero-valent iron (ZVI) coupled with microorganisms, has gained considerable attention in recent years for eliminating recalcitrant organic matters from wastewater. Nevertheless, there are no general conclusions regarding the degradation mechanism and the operating variables. In this paper, sponge iron (SFe, a kind of ZVI) has been submerged to the activated sludge process to develop a biological sponge iron system (SFe-M). The treatment impact of SFe-M system on aniline (AN) wastewater under the optimal conditions was significantly better than that of the general activated sludge system. In the SFe-M system, the variation trends of hydroxyl radicals (center dot OH) production were consistent with those of Fe(II), and the hydrogen peroxide concentration was approximately twice as high as the sum of activated sludge system and the SFe system. Both SFe and microorganisms could induce Fenton-like reactions directly or indirectly. This contributed to the production of center dot OH that constantly attacked the benzene ring and the amino group. It resulted in some nitrogen in AN released in the form of ammonia ions. Moreover, microorganisms could also use the mass and electrons during the AN conversion process. The AN was eventually oxidized to carbon dioxide.
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