Study On Degradation Mechanism Of Ibuprofen And Acetaminophen In Pharmaceutical Wastewater Engineering

In the past decade,drug pollutants as a new type of pollutants have attracted more and more attention of scholars,and the main sources of these drug pollutants have been traced back to the waste water of wastewater treatment plants because they are emitted in the environment.The destruction of the ecology has become more and more serious and even threaten the health of human beings.Therefore,the governance of them must not be delayed.The main pathways for the removal of these refractory organics are mainly biodegradation,which also includes sludge adsorption,photodegradation,and volatilization.There are also more and more methods for detecting these organic substances.The processing of samples includes liquid-liquid extraction,solid-phase extraction,etc.Now,the processed samples are mainly detected by GC/MS and LC/MS.This article first discussed the engineering application of anaerobic reactor+membrane bioreactor for the treatment of pharmaceutical wastewater.It briefly explained the project.The wastewater was sourced from a pharmaceutical factory in Shanghai.The water quality was characterized by high COD and contained refractory organic compounds ibuprofen and acetylbenzene.Aminophenol;then the design of this project is explained: including the characteristics of anaerobic aerobic membrane bioreactor;followed by the design process to determine the process,the final analysis of the operation of the project to explore the COD and ammonia nitrogen removal effect: The removal rates of COD and ammonia nitrogen can reach 99.2% and 94%,and the effluent COD concentration is less than 60mg/L,and the ammonia nitrogen concentration is less than 4.1mg/L.The influence of VFA and pH on the anaerobic system during engineering operation was analyzed.In order to analyze the distribution of ibuprofen and acetaminophen in anaerobic and aerobic and membrane bioreactors,the detection methods for ibuprofen and acetaminophen need to be established because there is no uniform standard for the detection of these organic substances.Finally,the use of solid-phase extraction combined with liquid chromatography and mass spectrometry to determine the possibility of the determination of ibuprofen and acetaminophen under different conditions was used to determine the pH of the extraction column and water sample.The selection of the eluent,activator,and finally,the selection of the HLB-extraction column and the use of methanol as the eluent were determined.The pH of the sample was 3.5 when the detection sensitivity was high,the repeatability was good,and the target substance was satisfied.The detection limit requirements,the recovery rate of more than 99%,relative standard deviation of less than 3%,can provide the experimental basis for subsequent analysis.Finally,anaerobic influent water,aerobic effluent and effluent of ibuprofen and acetaminophen in the effluent of the membrane bioreactor were tested using the LC-MS technique.The results showed that ibuprofen was distributed at all stages and the removal rates were It is 87.55%,89.01%,and 7.17%.It is decomposed into co-metabolism,anaerobic fermentation,and methanogenesis.It eventually degrades into methane and other saturated alkanes;it undergoes hydroxylation and carbonylation during the aerobic stage,and ultimately in microorganisms.Under the action of degradation to carbon dioxide and water.Acetaminophen is completely present in the anaerobic stage,with a removal rate of 90.49%.The aerobic phase is completely removed.This material is converted into smaller organics by hydrolysis in the anaerobic stage,and finally split into methane by the action of microorganisms through ring opening.,water and so on.The migration and transformation pathways of the two are mainly based on biodegradation,followed by effluent effluent and minimal adsorption of sludge.