Experimental Study On Removal Of Organic Phosphorus In Circulating Cooling Water

At present,with the vigorous development of China's environmental protection industry,various advanced sewage treatment technologies are competing.Advanced oxidation technology degrades hard-to-degrade components in high-concentration organic wastewater by generating large amounts of hydroxyl radicals,which has certain advantages in wastewater treatment.In this paper,we used Fenton oxidation,Fe-C micro-electrolysis,diamond electrochemical oxidation to study the degradation of organic phosphorus in circulating cooling water,in order to provide more experimental basis for the degradation of organic phosphorus in the circulating cooling water,and get a high efficiency organic phosphorus degradation process.The effect of Fenton oxidation on phosphorus removal was examined using initial pH,reaction time and dosage of drug as indicators.It was found that organic phosphorus was degraded into easily-processible inorganic phosphorus by adding Fenton's reagent,and some of the total phosphorus could also be removed.It was also found that when pH=4,reaction time was 45 min,n?H₂O₂?:n(Fe²⁺)=15:1,and H₂O₂dosage was 1.5 ml,the removal efficiency of organic phosphorus was the highest,and the maximum removal rate was 92.77%,The total phosphorus removal rate was82.7%.The iron-carbon micro-electrolysis system composed of scrap iron and graphite was used to treat organic phosphorus wastewater.Through experiments,we concluded that under aeration conditions,the pH of the solution was 4,the volume ratio of iron to carbon was 1:1,and the reaction time was 60 minutes,the total phosphorus content of organophosphorus phosphorus had a good treatment effect,and the removal rate of organic phosphorus could reach 92.3.%,total phosphorus removal rate reached64.8%..The factors affecting the electrochemical oxidation of organophosphorus by diamond electrode include the pH value of solution,reaction temperature,plate spacing,current density,ion concentration in solution,reaction time and so on.Through experiments,we found when the temperature was 35°C,the pH was 5,the current density was 15mA/cm²,the distance between the plates was 15mm,and the reaction time was 60 minutes,the organic phosphorus removal rate could reach 87.8%.Moreover,if the reaction time was sufficient,organic phosphorus could be completely removed from the solution.The effect of three advanced oxidation methods on the removal efficiency of organic phosphorus:electrochemical oxidation method>Fenton oxidation method>iron-carbon micro-electrolysis method,the effect of the total phosphorus removal order:Fenton oxidation method>iron-carbon micro-electrolysis method>electrochemical Oxidation method.From the aspects of the efficiency of oxidative degradation of organic matter and the improvement of the biodegradability of wastewater,it is more appropriate to choose the electrochemical oxidation method.From the direct removal of phosphorus from the circulating cooling water and the reduction of process steps,it is appropriate to use the Fenton oxidation method.