ZHOUHe-xi,LUOHua-rui,LIHua-wei,et al.Variation Characteristics of Dissolved Organic Matter in Wastewater Treatment Process of Chemical Industrial Park[J].China Water & Wastewater,2022,38(23):80-87.
Variation Characteristics of Dissolved Organic Matter in Wastewater Treatment Process of Chemical Industrial Park
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第23期
Page:
80-87
Column:
Date of publication:
2022-12-01
- Keywords:
- dissolved organic matter; chemical industrial park wastewater; hydrophilicity/hydrophobicity; molecular weight distribution; spectrum analysis
- Abstract:
- The removal of dissolved organic matter (DOM) is the key to reach the wastewater discharge standard in chemical industry parks. Therefore, in-depth analysis of the characteristics of DOM in wastewater is the premise of its efficient removal. The DOM variation characteristics of different treatment units along the process of a comprehensive wastewater treatment plant in a coastal chemical industry park in Jiangsu Province were systematically analyzed through hydrophilicity/hydrophobicity determination, gel chromatography molecular weight classification, UV-visible spectrum, three-dimensional fluorescence spectrum and infrared spectrum. The removal rates of DOC, COD and UV254 of the whole process were 78.6%, 81.1% and 93.7%, respectively, and the effluent quality met the local standard of Jiangsu Province: Discharge Standard of Water Pollutants for Chemical Industry (DB 32/939-2020). The DOM in wastewater was mainly hydrophilic substances, and the hydrophilicity increased along the treatment units. The molecular weight of DOM in wastewater was mainly distributed in the range of 1 000-3 000 u. After the treatment of hydrolytic acidification tank, intermediate tank, high efficiency clarifier, ozone catalytic oxidation tank and activated carbon filter, the removal rate of DOM reached 89.8%, and the UV-visible absorption spectrum was significantly weakened. Five fluorescence components, including two humic acids and three protein substances, were analyzed by parallel factor analysis model. The fluorescence intensity of component 3 was the highest, and biochemical treatment and activated carbon adsorption were the main removal pathways. The infrared spectrum results showed that the composition of wastewater was complex. However, the terminal activated carbon filter had a good performance for the adsorption of alkanes, aromatics, phenols, esters, carboxylic acids and even halogenated hydrocarbons.
Last Update:
2022-12-01