Experimental Study, The Ultrasonic Degradation Of Phenol Wastewater

A direct method named ultrasonic is based on ultrasonic action with H₂O₂ to producehydroxyl radicals, which are very active toward organic compounds, to degradation ofphenol. The effects of some factors such as initialization concentration, ultrasonicintensity, temperature and concentration of H₂O₂ to degrade phenol were investigated. Amethod of choicing operating conditions in HPLC was proposed. Proper HPLC operatingconditions were defined which could determine the degradation intermediates of phenol.These conditions include mobile phase, flow rate, detection wavelength, solvent and thechoice of quantity and quantity method. The analysis of the compounds investigatedrequired no longer than 10 minutes.The results showed that the effecting factors on ultrasonic reaction is initializationconcentration, ultrasonic intensity, concentration of H₂O₂, temperature and reaction time.When initialization concentration was 200mg/L, concentration of H₂O₂ was 1.0%,ultrasonic intensity was 11.18W/cm², catalyzer 0.5g/L, it can generate of hydroxylradicals to degradate phenol and the degradation rate is 84.18% by Spectrometric analysis.A proper HPLC operating conditions was proposed. Suitable chromatographic condition:the column temperature was ambient; The mobile phase was mixture of methanol andwater (55/45, v/v) maintained at a flow rate of 0.5mL/min. The UV detector was used at awavelength of 277nm. The analysis method of HPLC is simple, rapid and reproduciblewell. Under this conditions, It's recovery rate is 95.2% to 100.3%. It can separate andanalyze the mechanism of degradating phenol byhydroxyl radicals. The majorintermediary degradation products were para-dioxybenzene, catechol, malefic acid;further oxygenation, the products were carbon dioxide and water.