Study On The Treatment Of Phenolic Pollutants By Photocatalysis Coupled With Microbial Membrane Method

At present,due to the rapid development of science,technology and industrial production,the discharge of industrial or domestic wastewater into the water enviro nment will cause pollution.The enviro nmental pollution problem is becoming more and more serious,among which phenolic wastewater is difficult to degrade organic pollutants.So it is very important to find an effective and convenient method to deal with phenolic pollutants.Therefore,for the above problems,this paper proposes a new method and technology to treat phenolic wastewater,namely photocatalytic coupled microbial membrane method.And the methodology for the preparation of a good two kinds of photocatalyst,namely titanium dioxide photocatalyst Ti O₂photocatalyst?Ti O₂?and black?B-Ti O₂?respectively load to the pretreatment of the glass fiber cloth?GFC?.Then load the photocatalyst glass fiber cloth into the microbial reactor,the microbial cultivation and domestication,the glass fiber cloth grow on a certain amount of microbial membrane.In addition,the biomass carbon adsorbent is prepared by using corn straw as raw material and high temperature carbonization,which was used to load on glass fiber cloth together with B-Ti O₂photocatalyst to realize three functional coupling systems of photocatalytic coupling of microbial membrane and adsorbent,so as to treat phenolic wastewater more efficiently.The two systems are degraded under the condition of ultraviolet light and visible light respectively,and the degradation effect was studied.This new process has shown good results in the treatment of phenol wastewater and has solved the shortcomings of the traditional photocatalytic treatment of phenol wastewater.The degradation performance of the coupling system is analyzed,and the experimental results are analyzed in the following two aspects:?1?Flake white Ti O₂photocatalyst is prepared by hydrothermal method.When Ti O₂/GFC coupled microbial system is used,the best light source is uv light,the best effective depth is 0.5 cm,the best p H is 7,and the best carrier volume is 30%.In the experiment under optimal conditions,phenol with concentration of 100 mg/L and2,4,6-trichlorophenol?2,4,6-TCP?with concentration of 20 mg/L were selected as the target pollutants.When phenol was the pollutant,the reaction time is 5 h,the degradation rate is 77.74%,and the removal rate of COD is 96.71%.With 2,4,6-TCP as the pollutant,the reaction time is 6 h,the degradation rate is 68.8%,and the COD removal rate is 79.45%.The cyclic stability test is conducted to prove that the system can be recycled.The mechanism and degradation kinetics of photocatalytic coupling microorganisms were also proposed.?2?B-Ti O₂photocatalyst is prepared by calcining at high temperature.The adsorbent and photocatalyst were bonded to the fiberglass cloth simultaneously,and then put into the microbial reactor to grow the microbial membrane.In this experiment,the optimal water temperature is 23?,the optimal p H is 7,the optimal carrier volume is 30%,the visible light is the light source,and the optimal effective depth is 0.5 cm.When the degraded phenolic pollutants are 20 mg/L and 100 mg/L phenol,the highest degradation rates reached 99.2%and 95.7%after 5 hours of degradation.When the phenolic pollutants were degraded to 2,4,6-TCP of 20 mg/L,the degradation rate reached a maximum of 84.6%after 5 h degradation.Moreover,after four cyclic stability experiments,the photocatalytic coupling microorganisms and adsorption system still have excellent stability to the phenolic pollutants,which proves that the coupling system has a synergistic effect on the degradation of phenolic pollutants,can be recycled,and effectively saves the cost.The mechanism and degradation kinetics of photocatalytic coupling microorganisms were proposed.