The Treatment Of Phenolic Wastewater By Advanced Ozonation Processes

Phenol is a kind of fundamental chemical raw material, it is also a kind of by-products produced by many chemical industty Because of the critical effluent standard, It is more difficult to treat the wastewater contained phenol than before.The author researches the oxidation process of the wastewater contained phenol using Advanced Ozonation Processes, the results indicate: The electrophilic reaction between ozone and phenol have two stages, during the first stage, ozone molecular react mainly with phenol, the degradation of phenol is linear, however, in the second stage, it reacts with both phenol and its oxidation products, the degradation of phenol is parabola. During the treatment of wastewater contained phenol, pH is the key parameter, when pH > pKa, the reaction rate will increase rapidly; but the reaction~ temperature has little effect on the degradation of phenol by ozonation. The compared experiment of different gas dispersed equipment prove that self -sucked agitator has such advantages as good gas distribution, high ozone utilizing rate and lower mechanical energy consumed, it make the mass transfer efficiency very high compared with micro-gas bubble equipment. During the ozonation treatment processof wastewater polluted by phenol, Mn-catalyst make the color more easy to control than that of no catalyst, and it can increase about 20 percent points for the removal rate of CODEr based on the compared experiments. The best calcining temperature of manganese catalyst which made by the method of oxidation-revert is 200扖, using the raw material of Mn(N03)2 and KMnO4. The biodegradation of the effluent varies with the reaction time. At t =26.5CC, the modeling of kinetic model asV5following:When pL-I=3.1O-----9.OO, the mean reaction order is n=0.73, the chemical reaction rate constant k is between 2.7817 and 5.0873x102 (mol/L1073min?When pH > 9.0, the reaction order is n=l, but k change geatly. Based on the experimental data, k ~pH CQDc~ (mglL) and the concentration of phenol in the liquid are suitable the following relationship:ln(k) = -9.793 ?0.688 ln(pH) + 2.594 lfl(COD~r) ?2.403 ln(PhoHs) Compared with the standard F distribution value, the relationship is very good.