| Nitrobenzene compounds is one of the important chemical raw materials,and it is commonly used in dyes,pharmaceuticals and other industries.With the development of che mical industry,nitrobenzene compounds still go on entering the people's living environment.The nitrobenzene ketone wastewater contains a large number of nitrobenzene compounds,which contain high toxicity,chemical stability,difficult biodegradation,a long duration into the water pollution and so on.Due to the very little production plant,the current la ck of this kind of wastewater treatment is still relatively mature technology.The purpose of this paper is to study physical-chemical method and biological method combination process and the suitable process conditions for nitrobenzene ethyl ketone production wastew ater treatment effect.Fenton catalytic oxidation technology has unique advantages in the treatment of refractory organic pollutants,and because of the cost of the reagents is higher,it is generally used for the pretreatment of the wastewater treatment stage,so we choice Fenton catalytic oxidation of chemical pretreatment for nitrobenzene ethyl ketone prod uction wastewater.Through a series of experimental research,a preliminary explore Fenton catalytic oxidation system,and the effects of various factors on the main pollutant deg radation,as well as the best Fenton reagent dosing quantity.However after Fenton catalytic oxidation treatment,wastewater of nitrobenzene ethyl ketone production wastewater biochemical can be obviously improved,but water still has not reached the indicators "inte grated wastewater discharge standard".After using hydrolytic acidification/aerobic pretreatment of nitrobenzene ethyl ketone production wastewater biological treatment,and further a chieve the final goal of treatment of waste water in nitrobenzene ethyl ketone.At the same time to explore the suitable process conditions for practical engineering technical guidance,to further explore the combination technology of this kind of wastewater degradati on effect.Research shows that:1.Fenton catalytic oxidation system of nitrobenzene ethyl ketone production wastewater treatment process of optimum condition experiment can be concluded that:a)Fentoncat alytic oxidation of FeSO4·7H2O in the body of the biggest influence dosing quantity,pH value and the influence of hydrogen peroxide solution dosing quantity times;b)at room temperature,when the additive amount of FeSO4 ·7H2O is 2.5 g/L,the pH value of 3.0,the volume fraction of hydrogen peroxide was 0.9%,the reaction time of 120 min,Fent on treatment effect is best;c)the optimal condition was 94.87%,the removal rate of nit robenzene class CODcr removal rate reached 57.58%.2.Using hydrolytic acidification/aerobic treatment process after Fenton catalytic oxidation of nitrobenzene further biochemical experiment,ethyl ketone production wastewater rea ched the nitrobenzene ethyl ketone production wastewater treatment target finally.Study found that,hydrolysis acidification can withstand the maximum inlet concentration of CODcr = 1200 mg/L,the CODcr removal rate reached 55.25%,the removal rate of nitroben zene class is 95.61%;Water after hydrolysis acidification aerobic treatment,CODcr removal rate rose to 79.18%,meet the national integrated wastewater discharge water index level 3 standard(GB8978-1996)rules(CODcr<500 mg/L,the content of nitrobenzene class<5 mg/L).3.Practical engineering USES the experiment it is concluded that the optimal conditions for debugging,after mixing acid out-Fenton catalytic oxidation-hydrolysis acidifica tion-A/O-ozone oxidation-contact oxidation process,effluent CODcr of 220 mg/L(<500 mg/L),the content of nitrobenzene class is 1.5 mg/L(<5 mg/L),chroma is 75 times(<80 times),total nitrogen of 35 mg/L(<75 mg/L),all the indexes reached the standard of campus network to receive,and meet the national integrated wastewater disch arge level 3 standard(GB8978-1996).And stable operation for a year,the water indicators are up to standard. |
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