Study On Treatment Of Organic Wasterwater With A Novel Photocatalytic Reactor

This article took developing photocatalytic reactor may be used in the actual industrial wastewater disposal process as the goal. The immobilized technology of TiO2, the designing of photocatalytic reactor, the influencing factors of photocatalytic system, the reaction kinetics, the mechanism of degradation and the methods to improve photocatalytic effect were discussed. The feasibility of using a self-made photocatalytic reactor to dispose dry-spun acrylic fiber wastewater was studied.Through comparison test, it is found that not only P25 nanometer TiO2 coating method is more simple and direct but also the photoelectricitycatalysis effect is better than sol-gel method. Bias voltages had the good synergetic effect to the photocatalytic. By studying PEG-2000 wastewater in photoelectrocatalysis reactor, the reasonable disposal parameters were put forward and wre listed as followed: reaction time 3 hours, bias voltage 12V, pH 5.5, air flow rate 0.10m3·h-1 , UV lamp power 40W, circulation volume 450mL·min-1, COD removal efficiency 64.0%. The reaction kinetics was initially discussed and it showed that different concentrations of PEG-2000 wastewater represented different series reaction kinetics rules. The degradation mechanism was analysed and the final products of the reaction were CO2 and H2O. Adding oxidant H2O2 to the wastewater, doping TiO2 transition metal Ag+ and rare-earth metal La3+ and acidification modification by the sulfuric acid which effect photoelectro- catalytic were studied. The results showed that additional oxidant H2O2 was the best to improve the photoelectrocatalytic reaction.The dry-spun acrylic fiber wastewater quality of Qilu Petrochemical company has been analysed and was studied by a photocatalytic reactor. The COD was reduced obviously and the B/C value increased from 0.22 to 0.47. The test indicated that discharged acrylic fiber wastewater can mostly up to the standard after being disposed in a self-made Photoelectrocatalytic reactor. At last, combined with other treatment technology, a feasible technologic scheme that fit for dry-spun acrylic fiber wastewater treatment was proposed.