The Study Of The Catalytic Fenton-like Process For The Advanced Treatment Of Pharmaceutical Industrial Park Wastewater

The pharmaceutical wastewater is difficult to be treated by biochemical method because of its high content of pollutants,high concentration of suspended solids,strong toxicity,lots of refractory material,etc.So it is always the emphasis and difficulty in the field of industrial wastewater treatment.Fenton treatment technology has strong oxidative abilityamong the common advanced oxidation processes.By this method,the organic matter in wastewater can be completely oxidized into inorganic substance.In the reactioniron?II?salt as catalysts can catalyst and produce a kind of free radicals of high oxidation ability—·OH.Organic substance can be oxidized quickly by·OH consequently chromaticity and COD are reduced.But in homogeneous catalysis fenton reaction Catalysts are hardly sepreated from reaction medium resulting ineasy loss and secondary pollution.So heterogeneous fenton treatment technology has been widely used in the wastewater treatment.In this researchthe secondary effluent of Pharmaceutical park was used as the research object to evaluate the activity of the prepared catalysts.As a control,hrough the traditional fenton reactions was also studied to get the optimal p H and proper drug dosing ratio.The results showed that catalytic effects were best when the p H was 2-3.100 m L wastewater was treated by 1.5 m L of3% H₂O₂ and1.5 m Lof 0.05 mol/L Fe SO₄ was suitable.Manganese compound metal oxide of iron and containing Mn volcanic rocks were prepared: 200 ?,300 ?,400 ? loading Mn5 % of volcanic rocks in the catalyst,and 200 ?,300 ?,400 ? and 500 ? loading Mn7 % catalyst of volcanic rocks.The crystal structure of catalysts were determined by XRD and SEM.The crystal structureof loading manganese volcanic rock was changing from Na?Al Si₃O₈?into compound crystal with Na?Al Si₃O₈?and pyrolusite.The secondary effluent of pharmaceutical park treated by washing volcanic rocks and manganese compound metal oxide that make effluent bad through heterogeneous fenton experiments.Loading Mn5% volcanic rock under 300 ? roasting was proved woking best.Removaling rate of COD reach85% and removal rate of the chroma reached 80%.Loading Mn7 % volcanic rock under300 ? roasting was proved woking betterwith it the removaling rate of COD reach 85% and removal rate of the chroma reached 80%.But secondary use of catalysts were proved poor treatment effects when p H was 2-3.It explained that the catalyst stability was affected due to the loss of Fe/Mn elementsThe units of depth treatment process of the technical transformation was changed through experiments forpharmaceutical park.The removaling rate of COD reached 50%60% by changing the drug dosing quantity,pH controled in5to6and adding the volcanic rocks.With these methods,the wastewater of pharmaceutical park can reach the standard and discharge.