Pilot Research On The Removal Of Sudden Organic Phosphorus Pesticides Pollution In Source Water

In recent years,some of the major water bodies are polluted to some extent,public health has been greatly endangered due to the pollutants in water,and the control and removal of organic pollution in water has become a serious impact on further improving water quality.In rural areas,the phenomenon of organic phosphorus pesticides polution is universal,and the organic phosphorus pesticides is a class of highly efficient, powerful pesticides,extensively used in agriculture,family,storage and so on.Surface water,groundwater and reservoir water has been polluted because of its wide using.To different time water quality of Tangyu reservoir,this paper simulated sudden organic phosphorus pesticides pollution in laboratory,we can estimate the removal rate of omethoate by using gas chromatography through the change of its concentration in water after the pre-oxidation-coagulation,sedimentation,and the activated carbon(PAC) absorption process.Studies including six major aspects:(1)Characteristic of Tangyu water quality(2) Determining method and the choose of experimental conditions of the organic phosphorus pesticides(3)The method of determining initial concentration of organic phosphorus pesticides(4)Pilot research on removal of organic phosphorus pesticides and the select of coagulant,flocculant,oxidizing agent(5)Pilot study of using PAC to absorb organic phosphorus pesticide in water(6)Different experimental conditions on removing organic phosphorus pesticides and the effective factors.It is showed that:the concentration of organic phosphorus pesticides is low in the Tangyu reservoir.During the whole monitoring process,the TP concentration of reservoir is slightly more than Classâ…¢water limits in "surface water environmental quality standards".The other pollutant was little with the exception of TN and Mn was always higher than that of Classâ…¢water limits in "surface water environmental quality standards".Result:the removal rate of Omethoate was 15.69%when the dosage of PAC was 20mg/L,the PAM was 0.6mg/L and the KMnO₄ was 1.0mg/L by using flocculation and precipitation;While the removal rate rised to 23.53%after pre-oxidation by using KMnO₄;The combination of coagulation-sedimentation with PAC had better omethoate removal effection when the dosage of PAC is 12mg/L,and the removal rate was 27.45%. The combination KMnO₄ with PAC had stronger potency of removing organic phosphorus pesticides,the removal rate could reach to 31.37%.To sum up the above points,Tangyu reservoir had no organic phosphorus pesticides in usual.As the sudden organic phosphorus pesticides pollution,PAC+PAM+ KMnO₄ could lower the concentration of pesticides in water,but the removal rate was not high;Flocculation and precipitation combined with PAC had better removal rate to omethoate,and it could had further removal effection by adjusting the surface characteristic of PAC.KMnO₄ combined with PAC had no synergism to the removal rate of omethoate.But the removal result was higher than PAC absorption or KMnO₄ pre-oxidation respectively.The removal rate of all kinds conditions was between 15.69%～31.37%,Technics could only lower the concentration of omethoate in water but could not removed completely.