Study On Treatment Of Wastewater From Hydrogen Peroxide Production By Combination Of Strong Oxidation, Coagulation And Sedimentation

Characteristics of hydrogen peroxide production wastewater are high concentration,containing heavy aromatic hydrocarbons,water quality fluctuations.The research object of this paper is the hydrogen peroxide production wastewater of a chemical industry in Jiangxi Province,the wastewater mainly includes the liquid washing water,condensate produced during the clay bed regeneration,condensate and soaking water produced by hydrogenation tower regeneration and soaking water,washing equipment and ground and other wastewater.The main pollution factors are CODcr and TP.The measured wastewater CODcr was 3775mg/L,phosphate 22.45mg/L,pH was about 7.According to the characteristics of wastewater,use combined technology of “iron carbon microelectrolysis +Fenton oxidation+coagulation sedimentation+hydrolytic acidification+A/O” to treat the wastewater.Experimental results are as follows:1?The optimal conditions for the determination of various factors in the process of iron carbon micro electrolysis were determined by single factor experiments and orthogonal experiments: The mass ratio of iron to carbon was 1,the amount of iron powder was 10g/L,the reaction pH value was 2~3,the reaction time was 4h.under the condition of the reaction,the removal rate of wastewater' CODcr was about 70.2%,and CODcr was reduced to 1125mg/L.2?The optimal conditions for the determination of various factors in the process of Fenton oxidation were determined by single factor experiments and orthogonal experiments: The dosage of H2O2 was 4mL,the reaction pH was 4 and the reaction time was 70 min..Under the condition of the reaction,the removal rate of the wastewater was 57.1%,and the CODcr was reduced to 483mg/L.3?By comparing the effects of PAC and calcium hydroxide on phosphorus removal,calcium hydroxide was selected as neutralizer and polyacrylamide coagulant was added.Laboratory test to determine the optimum coagulation conditions: adjusting pH to 11.5,adding polypropylene amine milling coagulant,stirring time 20 min,sedimentation time 90 min,the total removal rate of P was 99.1%,the total phosphorus concentration decreased to 0.2mg/L,to meet emission standards.4?By above combined pretreatment process,with the increase of hydrolysis and acidification of the running time,the concentration of CODcr decreased,the removal rate increases,the running time reached more than 10 days after the treatment effect of the system gradually stabilized,on the removal rate of CODcr was about 25%~30%.CODcr of the wastewater after hydrolysis acidification is about 300mg/L.5?The A/O process has a better effect on the treatment of the two stage of hydrogen peroxide production wastewater,the residence time is 48 h,p H is neutral,the temperature is between 20~25 degrees Celsius,the CODcr removal rate is up to 80%,the total phosphorus removal rate is up to the standard of water quality.6?The project investment estimate,the operation cost of the waste water is 6.0 yuan per ton.