Studies On Intermediate Water Reuse By Using Hydroxyl Radical

Our country each major and medium city has all established manylarge and middle scale sewage treatment plants, every day somehundreds of thousands of tons sewage and the industrial waste reachthe sign after processing to discharge, this water diversion resourceshas not obtained the effective use, extremely was a pity. According tosurveys, the cities sewage after collection processing, 70% is maycirculate once more the use, may in have through the intermediatewater sales commission for the water volume invariable situation in,causes the cities to be possible to use the water volume to increaseabove 50%, saves in the economical disbursement aspect also isextremely considerable.The free radical (·OH) is one of chemical property extremelylively species, its standard oxidation electric potential is 2.8eV, is onlyinferior in the known oxidant to the fluorine, has very high electronaffinity [39];It may not have in the choice and the water pollutant hasthe response, very rapidly in the deuterium oxide each kind of organicmatter and the inorganic substance, also the oxidized efficiency is high,does not have two times of pollution;It in the sewage treatment, thedisinfection is antiseptic, aspect and so on industry synthesis and airpurification has the widespread application. Tryk and so on indicatedto the ·OH research that, in the ·OH active groups and bases photonenergy is equal to has the 3600K high temperature the heat energy tohave[38], sufficiently causes difficultly under this high temperature todegrade the organic matter split-ring, to break the key, the addition, thesubstitution, the electronic shift and so on, the macro-molecule isdifficult to degrade the organic matter to transform easily to degradethe small molecular matter, even the direct production inorganic ion,the carbon dioxide and the water, achieves the harmless goal.This article introduced intermediate water sales commission someconcepts, the method, and emphatically studied has carried on thewater sales commission effect and some influence factors using thefree radical.Processes the Liao River refinery and the Changchun workernatatorium swimming pool water used using the free radical, the effectis obvious, may realize the water sales commission goal. Liao Riverrefinery major targets or quotas is COD, after the free radical oxidized,the COD content reduces one half;But the Changchun workernatatorium processing effect is more obvious, its major targets orquotas for the bacterium total and the large intestine bacteria colonynumber, after free radical processing, bacterium number removing ratemay reach above 99%, but large intestine bacteria colony numberremoving rate has achieved 100%. Above the target may reach thenational life tap water health standard. This indicated the free radicalto the domestic water disinfection, the sterilization is very strong.This article simultaneously discussed in the ozone/ultraviolet rayoxidized the water process, has discussed the pH value, the processtime, factor and so on catalyst to the COD removing rate influence.The result indicated that, the ozone/ultraviolet ray the hydroxylfree radical output compares under the acidity and the neutralcondition under the alkalinity condition the output is big;Along withprocess time increase, in water COD value more and more small, CODremoving rate more and more big, namely gives the waste water effectwith this method processing to be obvious. After its 4h the COD valuehad achieved a level discharges the standard [1], removing rate has alsoachieved 80%. May realize the water sales commission goal;isadvantageous take the metallic ion as the main body catalyst to theCOD removing rate enhancement. In this experiment, the Cu catalysteffect must be slightly good to the Mn catalyst effect. The CuCl2amount used to processes the result to have the certain influence, whenthe CuCl2 density is 50ppm the effect is best, but the MnCl2 amountused to processes the result not to have the tremendous influence.Looking at from this article processing result, the free radicaladds water COD and the bacterium removes the effect obviously, theapplication prospect is broad.