Experimental Study On Pretreatment Of Biodegrdable Pharmaceutical Wastewater By Microelectrolysis-Fenton Reagent

The purification of pharmaceutical wastewater is a difficult problem in the industrial production process,which contains a large number of organic pollutants and its composition is complex and variable,water quality fluctuations and water quantity.Since the pharmaceutical wastewater is mainly composed of organic pollutants,the micro-electrolysis technology has physical adsorption,redox and complexation of organic pollutants,and the Fe²⁺ions generated during the electrolysis process interact with H₂O₂ to form Fenton reagent,which produces OH·has a good effect on the oxidative degradation of organic pollutants,so the use of micro-electrolysis-Fenton reagent to purify pharmaceutical wastewater has broad application prospects.This paper mainly uses the raw water quality after biochemical wastewater treatment as the research object.Firstly,the mechanism,influence conditions and purification effects of micro-electrolysis technology for purifying pharmaceutical wastewater are discussed.I have done a few researches on the following aspects:1.The orthogonality experiment determined that the important factors affecting the micro-electrolysis process conditions are influent pH value>retention time>iron filings>aeration volume?iron-carbon ratio,which has the greatest impact on the removal of organic pollutants in wastewater.It is the influent pH and residence time.The influence of iron filings,aeration,and iron-carbon ratio is relatively small.2.Through the influence of a single condition on the experiment,it is determined that the residence time is 40 minutes,the influent pH is equal to 3,the iron filings are 90 g/L,the aeration is 70 L/h,and the iron to carbon ratio is 2:1.For optimal experimental conditions,the removal rates of chroma and CODcr in the wastewater were 85%and 46%in this case.After the pharmaceutical wastewater was purified by micro-electrolysis process,although the water quality has been improved,it still has not achieved the expected target.Therefore,in this experiment,H₂O₂ is considered to be added,and Fe²⁺ions and H₂O₂ formed in the micro-electrolysis process are used to form a Fenton reagent.Purify pharmaceutical wastewater.I have done a few researches on the following aspects:1.The importance of the microelectrolysis-Fenton process conditions is determined by orthogonal experiments.The input of H₂O₂>FeSO₄·7H₂O input?pH>reaction time,the most important effect on the removal of organic pollutants in wastewater is H₂O₂.2.Through the influence of single conditions on the experiment,it is determined that the 28%H₂O₂ input and the FeSO₄·7H₂O input are6mL/L and 5g/L,the pH is 3,and the reaction time is 60 minutes.In this case,the removal rate of CODcr in the wastewater is 65%;3.Using the basis of the above experiment,the adsorption experiment was carried out.When the input amount of 1%PAM was 7mL/L,the turbidity removal rate was 98%,and at this time,the chromaticity of the effluent was less than 35 times,and the CODcr was less than 200 mg/L,the turbidity value is less than 35 NTU,reaching the target of the expected experiment.As an emerging technology in the 21st century,micro-electrolysis-Fenton process technology has a small footprint,simple instrumentation,easy operation and low economic cost,and the technology realizes the unity of economic,environmental and social benefits.with broadly application foreground.