Interaction Of Visible Light Photocatalytic Oxidation And Biodegradation Of Phenol In An Integrated Visible Light Photocatalytic-biological Reactor

The intimate coupling of photocatalysis and biodegration technology has gotwidespread concern since it were raised. This research base on the original intimatecoupling of photocatalysis and biodegration technology, achieving degration ofphenol within visible light by the use of upconversion luminescence agent dopedphotocatalysist, and explore a self-protective action of microorganisms in harshenvironment.Preparing three kinds of photocatalysts is for intimate coupling of photocatalysisand biodegration technology to explore different photocatalytic intensity in intimatecoupling of photocatalysis and biodegration system, and test extracellular polymericsubstances content changes over time. By SEM characterizes the spatial distributionchanges of the microorganism in carriers. Analysis the distribution changes ofextracellular polymeric substances and the living dead bacteria in carriers by the useof CLSM. We explain the self-protective action of microorganisms from themicrocosmic and macro view.The results showed that: the intimate coupling of photocatalysis and biodegrationtechnology achieves the removal of phenol was above90%, which indicates thefeasibility of intimate coupling of photocatalysis and biodegration. In the intimatecoupling of photocatalysis and biodegration system, microorganism excreted moreextracellular polymeric substances to protect themselves from the impact of adverseexternal environment. While the results of SEM and CLSM showed that spatiallocation migration of microorganisms in the carrier is a kind of self-protection actionof microorganisms, too.