Evaluation of Fe(VI)/Fe(II) combined with sludge adsorbents in secondary effluent organic matter removal

doi:10.1016/j.envres.2022.112737

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	Evaluation of Fe(VI)/Fe(II) combined with sludge adsorbents in secondary effluent organic matter removal
	Chen, Zhiqiang 2,3; Tang, Yingcai 2; Wen, Qinxue 2; Hu, Hongying 1
刊名	ENVIRONMENTAL RESEARCH
	2022-05-15
卷号	208
关键词	Effluent organic matter Enhanced coagulation Potassium ferrate Sludge adsorbent Densadeg
ISSN号	0013-9351
DOI	10.1016/j.envres.2022.112737
英文摘要	Wastewater reclamation and reuse are important methods that help to achieve an equilibrium within demand and offer, and also one of the important ways to reduce carbon emission. The existence of secondary effluent organic matter (EfOM) will bring potential threat to the environment in reuse process. Therefore, it is important to develop reclaimed water reuse technology that effectively remove EfOM. In this study, the removal of EfOM performance of ferrates enhanced by FeCl2 (Fe(VI)/Fe(II)) combined with sludge adsorbents (SAs) was evaluated by using the continuous-flow process (FeSDF), which was composed of Fe(VI)/Fe(II), SAs, densadeg and filtration. The results showed that when the inflow rate was 1 L/h, the optimal operating conditions of FeSDF including 5 mg/L of Fe(VI), 1 mg/L of Fe(II), 1 g/L of SA and 50% of the reflux ratio. Bulk organic indicators, including chemical oxygen demand, dissolved organic carbon, ammonia, total nitrogen, total phosphorus, turbidity, and ultraviolet absorbance at 254 nm in the effluent met the water quality standard for scenic environment use (GB/T 18921-2019 in China). The addition of Fe(II) makes the coagulation process by Fe(VI) produce more Fe(III) and produce more quality of sedimentary flocs and improve the removal efficiency of EfOM. The removal of organic micro-pollutants (OMPs) was mainly due to ferrate oxidation and SA adsorption in FeSDF, and the removal of most of the OMPs was more than 90%. The total fluorescence intensity removal efficiency in FeSDF was 63.8%. Moreover, the genotoxicity of the FeSDF effluent decreased to 0.73 mu g 4-nitroquiniline-N-oxide/L, and the reduction efficiency reached 97.6%. The actual efficiency of most of the indicators is greater than the expected efficiency, indicating that there is a synergistic comprehensive effect during the whole process operation of FeSDF.
WOS研究方向	Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
WOS记录号	WOS:000797301500003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158692]
专题	兰州理工大学
作者单位	1.Tsinghua Univ, Sch Environm Sci & Engn, Beijing 100084, Peoples R China 2.Harbin Inst Technol SKLUWRE HIT, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China; 3.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730070, Peoples R China;
推荐引用方式 GB/T 7714	Chen, Zhiqiang,Tang, Yingcai,Wen, Qinxue,et al. Evaluation of Fe(VI)/Fe(II) combined with sludge adsorbents in secondary effluent organic matter removal[J]. ENVIRONMENTAL RESEARCH,2022,208.
APA	Chen, Zhiqiang,Tang, Yingcai,Wen, Qinxue,&Hu, Hongying.(2022).Evaluation of Fe(VI)/Fe(II) combined with sludge adsorbents in secondary effluent organic matter removal.ENVIRONMENTAL RESEARCH,208.
MLA	Chen, Zhiqiang,et al."Evaluation of Fe(VI)/Fe(II) combined with sludge adsorbents in secondary effluent organic matter removal".ENVIRONMENTAL RESEARCH 208(2022).