Study On The Separation Of Nitrogen And Phosphorus In Urine By Combined Electrochemical Method

In this paper,a combined electrochemical method was used to process the simulated urine to remove the nitrogen and phosphorus.The combined electrochemical method is divided into two parts:1.The titanium and Magnesium Corrosion battery consisting of titanium and magnesium;2.The electrochemical device,the anode with microporous filter tube of titanium,and the stainless steel shell for the cathode.Some of the gases produced by the simulated urine and electrochemical reactions enter the interior of the anode through the micropores of the anode.On one hand,the mass transfer resistance and ohm resistance caused by the film are effectively reduced,and the ions in the solution are fully exposed to the surface of the electrode;on the other hand,the separation of the effluent from the anode and the cathode is realized.The results are as follows:1.The best condition of the independent electrochemical system to treat ammonia nitrogen removal from simulated urine is voltage 18V,anodic effluent:cathodic effluent=3:1;2.Through the treatment of simulated urine without urea and urea,it was found that urea was used as nitrogen source through electrocatalytic oxidation to produce ammonia nitrogen,which was the cause of the increase of ammonia nitrogen content in the later period;3.Under the constant voltage,increasing the current will cause the hydrolysis of water,which is not conducive to the removal of ammonia nitrogen;4.Through the experiment of the simulated urine of different dilution multiple and the experiment of titanium magnesium corrosion battery after the anodic and cathodic effluent,The simulated urine of low dilution multiple is not only unfavorable to the formation of magnesium ammonium phosphate,which affects the removal effect of ammonia and phosphorus,but also has obvious corrosion to the electrode.When the dilution time is 10 times and the titanium magnesium corrosion battery is placed at the cathode outlet,it will achieve high removal rate and guarantee the stable operation of the electrochemical electrolysis device;5.A diversion experiment of anodic effluent and cathodic effluent,the pH of cathodic effluent between 7.41-9.13,in line with the proper magnesium ammonium phosphate generated pH range,white precipitation collected through XRD(X-ray diffraction),XEM-EDS(scanning electron microscopy,energy spectrum analysis,get a better crystal structure and conform to the images of the characteristic peak,proof is given priority to with magnesium ammonium phosphate precipitation precipitation,the total removal rate of ammonia nitrogen is 36.56%,phosphorus removal rate can reach 43.07%,and high residual chlorine content in anodic effluent can be used in the sterilization of urine or used as a secondary water flushing;6.In the simulated urine adding quantitative humic acid,for recycling treatment,the final collection of material on the filter network after the cathode outlet pipe,we measured the urea content and compared with the urea content in the original humic acid,humic acid has a complex reaction with urea in the simulated urine,the generated brown substances containing urea humate.