Characteristics of dissolved organic matter in point-source wastewaters at a petrochemical plant: Molecular constituents and contributions to the influent of wastewater treatment plant

被引:4
作者
Kou, Yue [1 ]
Yang, Baiyu [1 ]
Jiang, Juntao [1 ]
Sun, He [1 ]
Zhang, Rui [1 ]
Li, Zhuoyu [1 ]
Wang, Qinghong [1 ]
Shi, Quan [1 ]
Chen, Chunmao [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Point-source petrochemical wastewaters; Dissolved organic matter; Characteristics; Orbitrap mass spectrometry; ELECTROSPRAY-IONIZATION; NAPHTHENIC ACIDS; REFINERY WASTE; TRANSFORMATION; OZONATION;
D O I
10.1016/j.envres.2023.117157
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Dissolved organic matter (DOM) in point-source petrochemical wastewaters (PCWs) from different operating units is closely linked to the efficiency of wastewater treatment plant (WWTP). However, systematic studies on DOM characters of point-source PCWs and their influences on WWTP influents were seldom conducted. In this study, DOM in three low-salinity point-source PCWs and four high-salinity point-source PCWs at a typical petrochemical plant were comprehensively characterized at a molecular level. Orbitrap mass spectrometry results indicated that point-source PCWs had diverse DOM constituents tightly related to the corresponding petrochemical processes. Phenols in oily wastewaters (OW), phenols and N-containing compounds in coal partial oxidation wastewater (POXW), and naphthenic acids (NAs) and aromatic acids in crude oil electric desalting unit wastewater (EDW) were characteristic DOM constituents for low-salinity point-source PCWs. While S-containing compounds (mercaptans, thiophenes) and NAs in spent caustic liquors (SCL), alcohols and esters in butanoloctanol plant wastewater (BOW), high molecular weight aromatic ketones in phenol-acetone plant wastewater (PAW), and oxygenated NAs as well as short chain N-containing compounds in concentrate from reverse osmosis unit (ROC) were characteristic DOM constituents for high-salinity point-source PCWs. Spearman correlation analysis indicated that though with relative low pollutant contents (OW) and discharge volume (EDW), N/O/S-containing compounds of OW and EDW greatly contributed to the polar DOM constituents of low-salinity influent in WWTP (R > 0.5, P < 0.001). While N-containing compounds of ROC mainly contributed to the polar DOM of high-salinity influent (R > 0.5, P < 0.001). Though N-/S-containing species in PAW had low contents, they also posed obvious impacts on DOM constituents of high-salinity influent. Interestingly, some O-/S-containing species were newly formed during the confluent process of high-salinity point-source PCWs. The results strengthened the combined contributions of pollutants contents, discharge emission and DOM constituents of point-source PCWs to the water matrix of WWTP influents, which would provide reference for the management of PCW streams.
引用
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页数:11
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