| Heterogeneous photo-catalytic oxidation is one of new methods for the treatment of the wasted water in 1970s, as it has the advantages of high efficiency and saving energy, lots of researchers paid attention to it. The new technology of degradation of NH/-N with the supported film of TiO2 as photo-catalyst under has been studied. The test shows that the method has the advantages of the less investments, decreasing the running investments, shortening the times of degradation and high removal rates.The fixture of catalyst was a very important aspect in heterogeneous photo-catalytic oxidation. The supported film of TiO2 was acquired with 6.5% of NaaSOa under 300 癈 in the article, it had high activity and enhanced the removal ratesThe effective factors of photo-catalytic oxidation were mainly the power of light, the volume of air, pH , the weight of catalyst and temperature . According to the levels of NHt+-N in plant wastewater between 33-100mg/L , the best technique parameters were such as below : the volume of air was 300L/h , pH was 11 , the temperature ranged from 25 to 35, the weight of catalyst was 1.6g .The article involved the contrasted degradation of NH4+-N in organic and inorganic compounds , the results showed that the degradation ratio for organic compound was less than for inorganic compound . Because CHsCOO in organic compound was also degraded and deleted OH in wastewater, the activity of photo-catalyst decreased , which was clear under less pH .The dynamics of photo-catalytic oxidation with the supported film of TiO2 fitted the model of L-H , it's dynamic characters showed that it appeared zero-grade reaction under high concentrations and one-grade reaction under less concentrations .
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