Co-process Pharmaceutical Park Tail Water And Domestic Wastewater By Fenton Coupled MBR

This paper takes the pharmaceutical wastewater of a pharmaceutical park in Northeast China as the research object.Based on the analysis of its water quality,the enhanced pretreatment process of Coagulation-Fenton combination,and the advanced treatment of pharmaceutical park tail water and domestic wastewater with MBR was carried out.The results are as follows.Due to the high turbidity of the pharmaceutical park tail water and the high concentration of SS,direct Fenton oxidation would affect the reaction efficiency.Therefore,coagulation was used to remove SS and colloids.This article compared the effects of polyferric sulfate?PFS?,polyaluminum chloride?PAC?and polyaluminum ferric sulfate?PAFC?on the removals of TOC,COD,NH₄⁺-N and UV₂₅₄ in the pharmaceutical park tail water.The results showed that the treatment effect of PFS was the best.In combination with the central response surface design?CCD?,the final result was that when the PFS dosage was 500 mg/L and the pH value was 7,the TOC was the largest and the removal rate reached 25.6%.The dissolved organic matter?DOM?in the coagulation process was analyzed by three-dimensional fluorescence-excited emission matrix spectroscopy combined with parallel factor analysis?EEM-PARAFAC?.The DOM was classified into four fluorescence components.Component1 and Component 2 belonged to UVA humus,component 3 belonged to UVC humus,and component 4 belonged to tryptophan,in which component 4 was difficult to remove.The study of the molecular weight distribution of the coagulated effluent showed that the molecular weight of the coagulation removal organic matter was greater than 10 kDa.The effects of the dosages of H₂O₂,Fe²⁺,the pH value,and the reaction time on the treatment efficiency of wastewater were investigated in Fenton's oxidation treatment of pharmaceutical park tail water.Combined with the CCD optimization design,it was found that the dosage of H₂O₂ was 11.24 mmol·L^-11 and FeSO₄·7H₂0 was3.87mmol·L^-1,the initial pH was 2.57,and the reaction time was 50min,the TOC removal rate was 42.78%.By EEM-PARAFAC analysis,the DOM in the Fenton effluent was divided into four components.Component 1 was a common material in agricultural wastewater and sewage.Component 2 belonged to macromolecular humus;component 3 was a common aromatic amino acid compound with relatively high molecular weight.Component 4 and component 3 had similar fluorescent positions and belonged to the same high-molecular aromatic acid compound,but the loading of component 4 was lower than that of component 3,and component 3 was the main reason for the high TOC value of the effluent.Fenton effluent with a molecular weight distribution of less than 1 kDa had a 13.12%increase in feed water.To further study the influence of pharmaceutical park tail water on MBR,the mixed water from pharmaceutical park tail water and domestic sewage entered into the MBR-A reactor,and the mixed water from the pretreated pharmaceutical park tail water and domestic sewage was injected into the MBR-B reactor.The effluent quality and microbial community in the reactors were studied.The Fenton coupled MBR treatment rate of COD in the mixed water of pharmaceutical park tail water and biological sewage reached more than 95%,and the treatment rate of ammonia nitrogen reached 50%⁶0%.The MBR-A effluent reached the Grade 1B standard for urban sewage discharge,MBR-B water reached Grade 1A standard.The study of DOM in two MBR reactors showed that the fluorescent substances in the influent water were mainly macromolecular aromatic amino acids such as humic acid and a tryptophan-like amino acid,and the fluorescent substances in the effluent water were mainly of lower molecular weight.Substances and amino acids resembling tryptophan substances,from which was deduced that amino acids like tryptophan substances were essential for the removal of pharmaceutical park tail water.he molecular weight distribution of MBR effluent was bimodal,with organic matter less than 1 KDa accounting for 98.51%and organic matter greater than 10 KDa accounting for 1.39%.Analysis of microbial communities in MBR revealed that the population structure changed as the species of microorganisms in the reaction decreased,norank-saprospiraceae and Albidiferax are the predominant species in MBR-A,and Thiothrix and Sphaero-tilus are the predominant species in MBR-B.