Study On Chemical Oxidation And Membrane Technology In Treatment Of Pharmaceutical Wastewater Containing Antibiotic

Pharmaceutical wastewater containing antibiotic (PWCA) is a sort of industrial wastewater which is difficult to be treated. The PWCA is hard to reach the industry discharge standard by conventional biological treatments. Thus in this work the treatment of PWCA with the purpose of reusing was studied.The quality of PWCA is analyzed. Based on the results of water quality analysis, the chemical oxidation technology and membrane technology is adopted to treat PWCA.In this work, the effects of photocatalysis(TiO2/UV), ozone(O3), photocatalytic oxidation(O3/TiO2/UV) for COD removal are investigated. The results show that the order of the COD removal for three methods is O3/TiO2/UV >O3 >TiO2/UV. A majority of organic substance about most 73% in experiment can be removed effectively using O3/TiO2/UV and COD removal increases with extending irradiation time, adding O3, increasing initial pH value. The removal of turbidity and color is 28%, 97%, respectively.A majority of organic substance about most 65% in experiment can be removed effectively using chlorine oxidation and COD removal increases with adding chlorine dosage, increasing initial pH value. The removal of turbidity and color is 80%, 97%, respectively. An economics analysis shows that at present the cost of PWCA treatment by photocatalytic oxidation and chlorine oxidation is expensive.The product water of O3/TiO2/UV are further treated by DL nanofiltration(NF) membrane and SC reverse osmosis(RO) membrane respectively. The results indicate that both DL membrane and the SC membrane can remove remaining COD effectively and the removals of COD were over 85%. Both of them have good rejection of salt, the rejections of HCO3-, Ca2+, SO42-, Fe2+/Fe3+ by DL membrane are 82%, 98%, 97%, 99.8%, respectively. The salt rejection of SC membrane is 99%. The quality of NF or RO permeate could meet the reuse requirements.The experiments on PWCA are carried out by hollow fiber ultrafiltration(UF) membrane and DL membrane. The results indicate that the UF-NF integrated membrane technology can remove COD effectively and has good rejection of salt. The COD removal and salt rejection of UF membrane is 45%, 58%, respectively. The COD removal of NF membrane is 93% and its rejection of HCO3-, Ca2+, SO42-,...