Degradation of polycyclic aromatic hydrocarbons in a coking wastewater treatment plant residual by an O3/ultraviolet fluidized bed reactor
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- 作者：Chong Lin (1)
Wanhui Zhang (2)
Mengyang Yuan (1)
Chunhua Feng (1)
Yuan Ren (1)
Chaohai Wei (1) (2) - 关键词：Coking wastewater ; O3/UV ; Fluidized bed reactor ; Polycyclic aromatic hydrocarbons ; Oxidation kinetics
- 刊名：Environmental Science and Pollution Research
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：21
- 期：17
- 页码：10329-10338
- 全文大小：882 KB
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Wanhui Zhang (2)
Mengyang Yuan (1)
Chunhua Feng (1)
Yuan Ren (1)
Chaohai Wei (1) (2)
1. College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China - ISSN：1614-7499
文摘
Coking wastewater treatment plant (CWWTP) represents a typical point source of polycyclic aromatic hydrocarbons (PAHs) to the water environment and threatens the safety of drinking water in downstream regions. To enhance the removal of residual PAHs from bio-treated coking wastewater, a pilot-scale O3/ultraviolet (UV) fluidized bed reactor (O3/UV FBR) was designed and different operating factors including UV irradiation intensity, pH, initial concentration, contact time, and hydraulic retention time (HRT) were investigated at an ozone level of 240?g?h? and 25?±-?°C. A health risk evaluation and cost analysis were also carried out under the continuous-flow mode. As far as we know, this is the first time an O3/UV FBR has been explored for PAHs treatment. The results indicated that between 41 and 75?% of 18 target PAHs were removed in O3/UV FBR due to synergistic effects of UV irradiation. Both increased reaction time and increased pH were beneficial for the removal of PAHs. The degradation of the target PAHs within 8?h can be well fitted by the pseudo-first-order kinetics (R 2--.920). The reaction rate was also positively correlated with the initial concentrations of PAHs. The health risk assessment showed that the total amount of carcinogenic substance exposure to surface water was reduced by 0.432?g?day?. The economic analysis showed that the O3/UV FBR was able to remove 18 target PAHs at a cost of US$0.34?m?. These results suggest that O3/UV FBR is efficient in removing residuals from CWWTP, thus reducing the accumulation of persistent pollutant released to surface water.