Experimental Study On The Hybrid System That Integrated Photovoltaic And Water Treatment

To improve the solar photochemistry wastewater treatment system performance,such as long dye decolorization time,low pollutants treatment capacity,high light loss of the system,complicated structure,leaks of the flow channel.In this paper,two systems were presented.In terms of improving the dyes degradation efficiency,the paper proposed a solar-driven photo-electrochemical hybrid system,in which ultra violet bands of the solar spectrum activated persulfate,visible and near infrared spectrums were converted to electricity by PV panels as energy source of the electrochemical process;in terms of optimizing device structure and reducing the optical losses,the paper proposed a solar photochemical water film system,which taking advantage of the thin film flow state of pollutants to achieve the lower optical losses and higher electricity generation.Firstly,the photovoltaics cells were integrated with solar photo-electrochemical process as an access to degrade azo dyes and generate energy simultaneously.The decolorization efficiency and PV performances of different reaction conditions were investigated outdoors by decoloring Acid Red 26.The results showed that synergistic effect was found for the enhancement on the decolorization of 50mg/L Acid Red 26 in the novel system.In comparison with solar photochemical and electrochemical processes,complete color removal time shortened 50% and 44.4% respectively.In this system,the water layer in flow channel reduced the PV temperature by absorbing the far infrared spectrum.The temperature rise of wastewater from 7 °C to 16 °C improved the color removal efficiency of the Acid Red 26.And the generated electricity of the hybrid system can satisfy the energy demand of electrochemical oxidation,even when the concentration of Acid Red 26 increased to 200 mg/L.Secondly,the paper also presented a solar photochemical water film system for the treatment of azo dyes and the electricity generation.Acid Red 26 and Acid Brown14 were chosen as the simulate pollutants;the experiments were operated in Tianjin outdoors.The results showed that the solar photochemical water film reactor could achieve higher decolorization efficiency and solar cells performances than the original photovoltaics photochemical system.In comparison with that system,the theoretical spectral transmittance of water film system improved 10.2%,and the temperature of the solar cells was lower,which improves the output power of the system.The waterfilm system with different flow velocity were also operated,the results showed that with lager flow velocity,the decolorization efficiency of dyes was higher,but the short-circuit current and the maximum output power of were lower,owing to the thicker thickness of liquid film.Besides,as the flow velocity increased,the energy consumed by the system increased.Therefore,lower flow velocity is better for the industry application.