SO32-/HSO5-体系去除印染生化尾水溶解性有机污染物

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Abstract

The conventional biochemical treatment effluent of dyeing wastewater (BREDW) still contains a certain concentration of dissolved organic pollutants (DOM) and Aniline strictly controlled by the new standard. Sodium bisulfite-activated potassium bisulfate complex salt (SO₃^2-/HSO₅^-) advanced oxidation system was used to produce sulfate radical (SO₄^-·) for the advanced treatment of BREDW. The effects of initial pH value, reaction temperature, SO₃^2-/HSO₅^-molar ratio and HSO₅^- dosage on the removal of COD and aniline were optimized based on response surface methodology. COD and aniline can be removed by the system remarkably. The contribution order of influencing factors to COD and aniline treatment were as follows:temperature>n(SO₃^2-)/n(HSO₅^-)>n(SO₃^2-)>initial pH value and n(HSO₅^-)>n(SO₃^2-)/n(HSO₅^-)/initial pH value>temperature. The removal rates of COD and aniline were 33% and 90% respectively under the experimental conditions by the experiment optimization:pH of 6.8, temperature of 53℃, concentration molar ratio SO₃^2- to HSO₅^- of 1.6 and HSO₅^- dosage of 37.1mmol/L. Further studies were made on the changes of fluorescence and molecular properties of the main DOMs before and after dyeing effluent treatment. 3DEEMs found that aromatic proteins and soluble microbial metabolites were the main components of DOM in the BREDW. The fluorescent DOM content in the oxidized effluent decreased significantly under different conditions, and the fluorescent area volume was reduced by 42.03%~77.67%. At the same time, the peak value of tryptophan (Ex/Em=230~225nm/340nm~330nm) in the oxidized effluent was observed to blue shift of 5~10nm. Polycyclic aromatic hydrocarbons in BREDW are decomposed into small molecules, the number of conjugated groups and aromatic rings decreases; GPC revealed that the proportion of macromolecules (0.45μm~100kDa) was 41%, that of medium molecules (12~100kDa) was 48.9%, that of peak molecular weight (Mp) was 56.324kDa, and that of Mw/Mn=2.168. After treatment, the effluent Mp mainly distributes in the range of 12.28~17.56kDa, with more small molecular substances, more structures and species. GC-MS synchronously reveals that the alkanes in the oxidized effluent are greatly reduced, and the main by-products are esters, alcohols and fatty acids, which can create conditions for further biochemical treatment.

Key words： the effluent of dyeing wastewater by biological treatment sulfate radical peroxymonosulfate Excitation- Emission-Matrix Spectra Gel Permeation Chromatography

Received: 20 December 2018

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X703.5

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	ZHANG Hao-nan
	TANG Hai
	LI Qiang
	ZHANG Chen
	LIU Gui-zhong

Cite this article:

ZHANG Hao-nan,TANG Hai,LI Qiang等. Removal of soluble organic containments from dyeing biochemical effluent by SO₃²^-/HSO₅^- system optimized[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2854-2863.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2854

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