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Xing R.,Peking University | Xing R.,CECEP Liuhe and Talroad Environmental Technology Co. | Zheng Z.,Peking University | Wen D.,Peking University
Journal of Environmental Sciences (China) | Year: 2015

In this study, ultraviolet (UV) and vacuum ultraviolet (VUV) photolysis were investigated for the pre-treatment and post-treatment of coking wastewater. First, 6-fold diluted raw coking wastewater was irradiated by UV and VUV. It was found that 15.9%-35.4% total organic carbon (TOC) was removed after 24hr irradiation. The irradiated effluent could be degraded by the acclimated activated sludge. Even though the VUV photolysis removed more chemical oxygen demand (COD) than UV, the UV-irradiated effluent demonstrated better biodegradability. After 4hr UV irradiation, the biological oxygen demand BOD5/COD ratio of irradiated coking wastewater increased from 0.163 to 0.224, and its toxicity decreased to the greatest extent. Second, the biologically treated coking wastewater was irradiated by UV and VUV. Both of them were able to remove 37%-47% TOC within 8hr irradiation. Compared to UV, VUV photolysis could significantly improve the transparency of the bio-treated effluent. VUV also reduced 7% more ammonia nitrogen (NH4 +-N), 17% more nitrite nitrogen (NO2 --N), and 18% more total nitrogen (TN) than UV, producing 35% less nitrite nitrogen (NO3 --N) as a result. In conclusion, UV irradiation was better in improving the biodegradability of coking wastewater, while VUV was more effective at photolyzing the residual organic compounds and inorganic N-species in the bio-treated effluent. © 2015. Source


Chen Y.H.,CECEP Liuhe and Talroad Environmental Technology Co. | Li W.C.,Hebei University of Technology | Zhang L.N.,CECEP Liuhe and Talroad Environmental Technology Co.
Advanced Materials Research | Year: 2014

The online monitoring system for pollution sources has been built for several years. China has initially established a set of environmental protection internet of things system which is under three levels of Ministry, provincial and municipal. This national project is the first step to develop in the applications of environmental protection internet of things. It also has many problems, such as monitoring range is narrow, sensor technology is not mature and cost is high. The next work is to strengthen the application and realize the convert from a point source pollution monitoring to surface monitoring. RFID is one of the key technologies of Internet of things. The paper proposed monitoring and supervisor system for key pollution sources based on RFID, to solve the problems in the monitoring and supervisor system for key pollution sources. It will realize information of monitoring and supervisor system for key pollution sources. © (2014) Trans Tech Publications, Switzerland. Source


Chen Y.H.,CECEP Liuhe and Talroad Environmental Technology Co. | Li J.,CECEP Liuhe and Talroad Environmental Technology Co. | Zhang L.N.,CECEP Liuhe and Talroad Environmental Technology Co.
Advanced Materials Research | Year: 2014

Recently, China has encountered significant challenges in improving, on a large scale, the environmental performance of its industries, which puts great threat to energy conservation and human health. As one of the State-owned Key Enterprises, to check and reduce negative environmental impacts throughout the subsidiary companies' production processes, pollutant emission audit is conducted, which will find total mass of discharged pollutant and weaknesses in the enterprises' environmental management. Consequently, this paper established the audit framework, concluding audit objectives, principle and methodology. Finally, nine companies were conducted in this case study. © (2014) Trans Tech Publications, Switzerland. Source

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