Study On The Removal Of Several Typical Pharmaceuticals And Personal Care Products From Water And The Production Of Its Disinfection By-products

PPCPs is one of the characteristic emerging contaminants,its ubiquity in the environment is affecting the ecological environment and the health of animals and plants with a subtal way,What is more,the exist of PPCPs in the water will produce DBPs during the drinking water disinfection process,which means a higher risk to human’s health.In this task,several advanced oxidation processes,like UV/PS,UV/H2O2 and anion activated PMS were used to remove the common PPCPs,TMP.The Fe2+/UV activated PMS process was used to remove CBZ.Focused on the affects of oxidant concentration,target pollutants concentration, catalyst concentration,p H value,humic acid and anions concentration etc. on corresponding advanced oxidation processes,the mechanisms of actions were also analyzed. Based on the traditional two disinfection methods, chlorination and chloramination,the same concentration CBZ,TMP and the new added CTC were used to do researches into DBPs culture.In addition, chlorination has done after the pre-oxidation of TMP、CBZ and CTC by three advanced oxidation processes. The research showed:(1) The reaction of UV/PS and UV/H2O2 with TMP abided by pseudo-first-order kinetics,the removal rate of TMP in UV/PS was higher than UV/H2O2 at the room temperature.High p H value inhibited the degradation of TMP;the co-exist anions’ s effects on reactions are complicated,while CO32- and HCO3-could not be doubted to inhibit the processes.(2) NO3- and SO42- could not activate PMS in the five anions(CO32-、Cl-、HPO42-、NO3-、SO42-),however,the active species of CO32-/PMS, Cl-/PMS and HPO42-/PMS were not same,they were HCO4-,HOCl and SO4-·;high p H value will lead to the alkali activation of PMS;other than the other advanced oxidation methods,this reaction couldn’t be quenched by humic acid.(3) Excessive concentration of oxidant and catalyst didn’t means high degradation rate.Small areas of UV light, high p H value and high HA concentration leaded to low removal rate of CBZ in Fe2+/UV/PMS.To promote the reaction, added Fe2+ by several times and appropriate citrate could be efficient.(4) DBPs was selected to detect after the chlorination and chloramination of CBZ,TMP and CTC,found that more carbon atoms in precursor’s molecule,longer reaction time and higher oxidant concentration resulted in higher production of DBPs,which was also decided by the characters of precursor itself;during the disinfection reactions,some kinds of DBPs would transform one another or volatilize; chloramination could effective control the production of C-DBPs;neutral condition helped to produce DBPs;advanced oxidation reaction as the pre-treatment would change the structures of the percursors,which made them harder to form DBPs.