Pretreatment Of High Concentration Refractory Chemical Wastewater And Simulation Of Biological Treatment Process

In this study,the wastewater after mixing dye wastewater and auxiliary wastewater is the research object.The wastewater has the characteristics of being difficult to degrade and low biodegradability.Using Fe-C micro-electrolysis,Fenon oxidation process,Fe-C micro-electrolysis-Fenton oxidation combined process to conduct pretreatment experiment research on wastewater,improve the biodegradability of wastewater,and compare the Fe-C micro-electrolysis-Fenton oxidation combined process with a single process to treat wastewater Effect and impact on wastewater biodegradability.With the help of BioWin software,a simulation model that matches the biological treatment process of the Lanzhou Xinqu Chemical Park Wastewater Treatment Plant is built to provide parameter guidance for the normal operation of the sewage treatment plant.?1?The concentration of CODCr in experimental wastewater is53198.695⁸7130.701mg/L,temperature is 20?,pH range is 6.61⁶.88;the best effluent water quality after pretreatment is the influent water quality of the model,the specific water quality parameters are:water quantity 2500m³/d,CODCr concentration9592.827mg/L,temperature 20?,pH 6.60,BOD₅ concentration 3919.508mg/L,NH3-N concentration 35mg/L,TN concentration 40mg/L,TP concentration 5mg/L,SS concentration is 5mg/L.?2?Experimental study on pretreatment of wastewater by Fe-C micro-electrolysis process:The optimum factors were determined:the dosage of iron powder is 50g/L,the mass ratio of Fe to C is 1:3,and the reaction time is 90min.At this time,the removal rate of CODCr in wastewater can reach 60.398%;It was determined that the degradation process of CODCr by Fe-C microelectrolysis technology followed three-stage reaction kinetics.?3?Experimental study on pretreatment of wastewater by Fenton oxidation method:Orthogonal experiment determined that the best combination of factors is:pH is 6,H2O2 dosage is 1/5Qth?4.2mL?,n?H2O2?:n(Fe²⁺)=9:1,reaction time is 120min,and the removal rate of CODCr in wastewater can reach 72.142%.It was determined that the process of CODCr degradation by Fenton oxidation followed three-stage reaction kinetics.?4?The experimental study on the pretreatment of wastewater using the Fe-C micro-electrolysis-Fenton oxidation combined process:By comparing and analyzing the combined process and single process treatment effects and the impact on biodegradability,it can be seen that the combined process has a better effect of removing CODCr,while consuming chemicals Less amount;B/C value increased to0.409 after combined process pretreatment of wastewater,which is more powerful than single process pretreatment wastewater to increase B/C value,which improves the biodegradability of wastewater.?5?BioWin software was used to simulate the treatment process of high-concentration refractory chemical wastewater and optimize the design parameters.Through single-factor analysis,discuss the influence of hydraulic retention time,internal reflux ratio,external reflux ratio,sludge discharge,aeration,PAC investment The influence of changes in dosage and other factors,and recommends process operation parameters.