Removal of refractory nitrogen-containing heterocyclic aromatics by combination treatment of microbubble catalytic ozonation and biological process
ZHOU Hong-zheng, LIU Ping, ZHANG Jing, LIU Chun, CHEN Xiao-xuan, ZHANG Lei
Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
A combination of microbubble catalytic ozonation and biological process was used for advanced treatment of bio-treated coal chemical wastewater (BCCW). Contaminant removal performance in the combination system was investigated. Degradation of nitrogen-containing heterocyclic aromatics and biodegradability variation of BCCW were discussed during combination treatment. The average COD removal efficiency of 26.4% and the average COD loading rate removed of 1.46kg/(m3·d) could be achieved in microbubble catalytic ozonation treatment. Moreover, the BOD5/COD value of BCCW increased from 0.038 to 0.30 after microbubble catalytic ozonation treatment, which could improve COD removal performance in the following biological process. The total COD removal efficiency of the combination system reached to 62.4%, which was much better than that of biological treatment alone. The nitrogen-containing heterocyclic aromatics in BCCW could be degraded efficiently by microbubble catalytic ozonation treatment, releasing ammonia nitrogen which could be removed further in the following biological treatment. In addition, the total UV254 removal efficiency in the combination system was 68.9%. The GC-MS, UV-Vis spectra and fluorescence excitation-emission matrix (EEM) spectra of BCCW were analyzed during combination treatment. The nitrogen-containing heterocyclic aromatics were identified to be the main refractory contaminants in BCCW, and microbubble catalytic ozonation was effective for degradation of nitrogen-containing heterocyclic aromatics, to generate low-molecular-weight organics and improve BCCW biodegradability.
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