Research On UV-Fenton Treatment Of Simulated Pharmaceutical Wastewater

The pharmaceutical wastewater belongs to a class of industrialnonbiodegradable wastewater, mainly due to the high COD concentration in thewastewater, containing bio-toxic and nonbiodegradable substances. This thesisfocused on the characteristics of these simulated pharmaceutical wastewater. Atroom temperature and atmospheric pressure, ultraviolet light was introduced intothe Fenton system of simulated berberine pharmaceutical wastewater, simulatedcefotaxime sodium pharmaceutical wastewater and simulated Chinese traditionalmedicine wastewater to study the oxidative degradation.In this paper, three advanced oxidation process UV-H₂O₂, Fenton andUV-Fenton were used to treat three simulated wastewater. The experimental resultsshowed that from the point of the degradation of COD and improving wastewaterbiodegradability, UV-Fenton process had much more advantages. For some specialsubstances of pharmaceutical wastewater, UV-H₂O₂and Fenton could not becompletely degraded, but UV-Fenton method could completely degrade pollutantsin the wastewater.In order to achieve better treatment effect, using UV-Fenton process treatedthree kinds of simulated pharmaceutical wastewater to optimize the operatingparameters. The experimental results showed that for the simulated berberinepharmaceutical wastewater, under the condition of initial pH of3.0, initial Fe²⁺concentration of800mg/L, hydrogen peroxide concentration of5%,2.5h of thereaction time, the COD of the treated sewage was evidently decreased to61.57mg/L;for the simulated cefotaxime sodium pharmaceutical wastewater, under thecondition of initial pH3.0, initial Fe²⁺concentration of1200mg/L, hydrogenperoxide concentration of5%,2.5h of the reaction time, the COD of the treatedsewage was evidently decreased to63.815mg/L; for simulation of Chinesepharmaceutical wastewater that COD of the raw water was9545mg/L, undedr thecondition of initial pH of3.0, initial Fe²⁺concentration of2500mg/L, hydrogenperoxide concentration of9%,4h of the reaction time, the COD of the treatedsewage was evidently decreased to63.59mg/L. All COD removal rate could achieve90%or more, and BOD₅/COD could reach0.9. From all of the above UV-Fentonprocess is an effective method of treatment of pharmaceutical wastewater.