Preparation Characteristics And Accelerating Denitrification Effectiveness Of Polyurethane And Polyurethane Modified By Quinone

With the development of increasing environmental problems of nitrate waste water,more and more people paid attention to the biological wastewater treatment technology and the technology of quinone base redox mediators catalytic biological denitrification had become a research hotspot.The purpose of this experiment was to prepare the functional biological carriers which were formed by polyurethane（PU）and anthraquinone compounds,In this paper,we found that the blank polyurethane materials also had the performance of accelerating biological denitrification.Here in we elaborately explored the biologically catalytic properties of the blank polyurethane material and function of biological carrier and optimized the synthetic route,which further development of efficient catalytic nitrate degradation of polyurethane polymer materials.In the experiment,the infrared spectrum discovered that 2-NH₃ anthraquinone was already grafted onto polyurethane materials.The result from catalytic biological denitrification experiments showed that the best temperature of catalytic effect was at80℃for anthraquinone polyurethane foam material,and the nitrate removal rate reached62.5%which was 1.3 times of blank experiment under the 80℃in 12h.The film polyurethane material could avoid the adverse effect of urea chemical structure on the denitrification and could accelerate degradation of nitrate.The biological denitrification effect increased with the increase of the anthraquinone content in polyurethane materials.The removal rate could reach 85%in 12 h after added 2-3 g amino anthraquinone polyurethane materials.Blank polyurethane materials still had the function of accelerating the biological denitrification,which become a focus of this research.In the polyurethane materials accelerating denitrification system,the polyurethane materials synthesized by TDI and polyether polyol had obvious effect in accelerating degradation of nitrate.The nitrate could completed degrade at 8h and removal rate could reach 90%.There was the positive correlation between the PU and nitrate degradation efficiency.The PU synthesized by 1,4-phenylene diisocyanate and polyether polyol also could effectively accelerate the degradation of nitrate,but PU synthesized by HDI and polyether polyol had no obvious acceleration.The polyurethane materials had perfect effectiveness on the accelerating denitrification and stable activity.The PU were suitable for use in engineering applications due to the simple synthetic technique and the denitrification efficiency.The effect of different hydroxyl groups and polyurethane materials on the catalytic performance was different.The polyurethane material synthesized by castor oil and TDI had the effect of accelerating nitrate degradation,and the removal rate in 10h could reach87%and was 1.3 times of the blank experiment.Above all,anthraquinone polyurethane materials and and blank polyurethane materials both had the ability of good catalytic biological denitrification,which provided technical support for the application of the polymer materials for the degradation of nitrate wastewater.