Effective oxidative degradation of coal gasification wastewater by ozonation: A process study | |
Yang, ZY (Yang, Zhiyong)[ 1,2,3,4 ]; Zhang, YG (Zhang, Yagang)[ 1,2,3,4 ]; Zhu, WJ (Zhu, Wenjuan)[ 4 ]; Zan, XJ (Zan, Xingjie)[ 2,3 ]; Zhang, LT (Zhang, Letao)[ 2 ]; Liu, YX (Liu, Yanxia)[ 1,2 ] | |
刊名 | CHEMOSPHERE |
2020 | |
卷号 | 255期号:9页码:1-11 |
关键词 | Coal gasification wastewater Degradation Ozonation Component Chemical oxygen demand |
ISSN号 | 0045-6535 |
DOI | 10.1016/j.chemosphere.2020.126963 |
英文摘要 | Coal gasification wastewater (CGW) has attracted considerable industrial attention because of its high toxicity and poor biodegradability. Ozonation is a promising process for CGW treatment. In this study, the effects of ozone concentration, pH, and ozonation time on CGW treatment were investigated. The results confirmed that CGW was degraded effectively and that the chemical oxygen demand (COD) was reduced from 1057 to 362 mgL(-1), utilizing 50 mgL(-1) ozone for 90 min. Further, the color of CGW changed from brown to clear and colorless, and the pH decreased from 8.5 to 4.7. Importantly, molds were observed in the oxidized CGW after 14 d at room temperature (23 +/- 2 degrees C), indicating that CGW is significantly biodegradable by ozonation. The CGW components were extracted with three different organic solvents (chloroform, n-hexane, and benzene), and their compositions were analyzed by gas chromatography-mass spectrometry (GC-MS) before and after ozonation. The results proved that considerable amounts of highly toxic refractory compounds in CGW, such as phenolic compounds, polynuclear aromatic hydrocarbons (PAHs), and nitrogenous heterocyclic compounds (NHCs), were degraded to compounds that included olefins, carboxylic acids, and cycloalkanes, or minerals, which are relatively environmentally benign. Moreover, the number of substances in CGW decreased significantly from 127 to 74 after ozonation. Summarily, ozonation is a promising approach for the treatment of highly toxic refractory wastewater, such as CGW. |
WOS记录号 | WOS:000538127800061 |
内容类型 | 期刊论文 |
源URL | [http://ir.xjipc.cas.cn/handle/365002/7355] |
专题 | 新疆理化技术研究所_资源化学研究室 |
通讯作者 | Zhang, YG (Zhang, Yagang)[ 1,2,3,4 ] |
作者单位 | 1.Xinjiang Inst Engn, Dept Chem & Environm Engn, Urumqi 830023, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China 4.Univ Elect Sci & Technol China, Sch Mat & Energy, Chengdu 611731, Peoples R China |
推荐引用方式 GB/T 7714 | Yang, ZY ,Zhang, YG ,Zhu, WJ ,et al. Effective oxidative degradation of coal gasification wastewater by ozonation: A process study[J]. CHEMOSPHERE,2020,255(9):1-11. |
APA | Yang, ZY ,Zhang, YG ,Zhu, WJ ,Zan, XJ ,Zhang, LT ,&Liu, YX .(2020).Effective oxidative degradation of coal gasification wastewater by ozonation: A process study.CHEMOSPHERE,255(9),1-11. |
MLA | Yang, ZY ,et al."Effective oxidative degradation of coal gasification wastewater by ozonation: A process study".CHEMOSPHERE 255.9(2020):1-11. |
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