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Merck
CN
  • [Mechanisms of UV photodegradation on performance of a subsequent biofilter treating gaseous chlorobenzene].

[Mechanisms of UV photodegradation on performance of a subsequent biofilter treating gaseous chlorobenzene].

Huan jing ke xue= Huanjing kexue (2012-03-29)
Can Wang, Jin-Ying Xi, Hong-Ying Hu, Yuan Yao
摘要

To provide insight into effects of UV pretreatment on a subsequent biofilters, the mechanisms of UV pretreatment on biofilter performance were further studied. Results showed that gaseous chlorobenzene UV photodegradation products resulted in a pH decrease from 6-8 to 4-7 in filter bed. Ozone produced by UV photodegradation changed the physical properties of biofilm by reducing biofilm thickness and oxidizing surface part of the extra-cellular polymer substance, which promoted the oxygen, nutrient and pollutant transfer to biofilm. The reduction of biofilm thickness further resulted in the improvement of filter bed's physical properties by providing a higher specific surface area of 880 m x m(-3) compared with the value of 784 m2 x m(-3) without UV pretreatment.

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