| Using Ultraviolet (UV) oxidation as biotrickling filter (BTF) pretreatment methods to purify the volatile organic compounds (VOCs), particularly poor water soluble and difficult biodegradable Persistent Organic Pollutants (POPs) has become a new technology in recent years.Experiment studied on chlorobenzene (CB). In the part of UV oxidation experiment, the removal efficiency could achieve 87%; the illumination time and initial concentration had great effect on degradation. The maximum removal loading of CB closed to 810 g/(m3·h) in experiment. Through analysing the UV oxidation products, it was found that the organic acids, aldehydes without chlorine were great amount, and they were easily disposed by BTF because good water-soluble and biodegradable.After two months of domestication and start-up, BTF entered the stable operational state. It was found that the CB degradation bacteria had good adaptability with pH, the acidic environment was good for microbial degradation. The maximum removal loading of CB was 230～255 g/(m3·h) which was far less than that of UV oxidation. In order to improve the disposal performance of BTF, Sodium Dodecyl benzene Sulfonate (SDS) was added into the nutrient solution for promoting CB dissolved in liquid, the results showed that removal efficiency increased by 20%.The use of UV oxidation products for domestication found that the mixed gas containing organic substance and the decrease of O2 amount into the BTF would reduce the removal efficiency of CB. After UV pretreatment, the UV-BTF combined system had markedly improved than BTF in CB disposal, and the removal efficiency of CB could more than 90%. The removal loading of UV-BTF combined system could achieve 410 g/(m3·h). The products concluding water-soluble organic acids, aldehydes of UV oxidation could be easily degraded in the BTF, but the amount of some chlorinated organics, such as phosgene, chlorinated aliphatic hydrocarbons had little change in the out gas. |
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