Pretreatment Of Actual Industrial Wastewater By Ozone Oxidation

The regional distribution of water resources in China is not uniform,and the per capita water resources are lower than the world average level.The pollution of industrial wastewater on water resources aggravates the situation of water shortage in China,resulting in the current situation of water shortage in China.Industrial wastewater has always been a difficult problem in the process of water treatment.The average treatment rate in developed countries is only 60-70%,and the traditional biological and chemical methods cannot be well treated.In this paper,the treatment schemes of four kinds of practical industrial wastewater?tetramethoxy silane wastewater,battery soaking liquid,diphenylketone wastewater and sodium fluorosilicate wastewater?were studied from the perspectives of p H value,O3 initiator(Fe²⁺and H₂O₂)and activated carbon.Through exploring different initial p H value?p H=2.0,4.0,7.0,10.0,12.0?under the condition of the influence of ozone treatment of industrial wastewater,respectively to four kinds of waste water was studied,and four methoxy silane battery waste water,soaking liquid,diphenyl ketone wastewater in the p H=12.0,2 h reaction,total ozone dosing quantity is 2.8 g/L best COD removal rate,66.5%,31.5%,76.1%,sodium fluosilicate wastewater in the p H=2,2 h reaction,total ozone dosing quantity is 2.8 g/L,The best COD removal rate was 83.3%.Through research of two kinds of initiator(Fe²⁺and H₂O₂)triggered effect of ozone from the front of the initial p H of raw water and it is concluded that under the optimum p H value after the best dosing quantity,explore in different wastewater,initial p H value,the action of the initiator ultimately determine the best conditions,and on the basis of fitting the reaction equation of total ozone dosing quantity is 2.8 g/L,including four methoxy silane wastewater in initial p H=12.0,200 mg/L Fe²⁺dosage,COD removal rate can reach71.3%;When initial p H=12.0 and H₂O₂ is added with 2 m L/L,COD removal rate can reach73.3%.When the initial p H of the battery immersion solution was 12.0 and Fe²⁺was added to 300 mg/L,the COD removal rate could reach 33.6%.When initial p H=12.0 and H₂O₂ is added with 4 m L/L,COD removal rate can reach 42.9%.When the initial p H value was 12.0and Fe²⁺was added to 500 mg/L,the COD removal rate reached 82.1%.When initial p H=12.0 and H2O2 is added with 2 m L/L,COD removal rate can reach 80.2%.When the raw water p H=0.84 and Fe2+was added to 200 mg/L,the COD removal rate could reach92.9%.When initial p H=12.0 and H₂O₂ is added with 2 m L/L,COD removal rate can reach95.2%.By exploring the catalytic effect of activated carbon on ozone and comparing p H values under different dosages and optimal dosages,it is concluded that the dosages of activated carbon are positively correlated with the effects of ozone treatment.When the initial p H value is 12 and activated carbon is added to 10 g/L,the COD removal rate can reach72.8%.When the initial p H value of battery soaking wastewater is 12 and activated carbon is added to 10 g/L,the COD removal rate can reach 44.2%.When the initial p H value of diphenylketone wastewater is 12 and activated carbon is added to 10 g/L,the COD removal rate can reach 80.6%.When sodium fluorosilicate wastewater is added to activated carbon at p H=0.84 and 3 g/L of raw water,the COD removal rate can reach 97.6%.