Study On The Treatment Of Slaughter House Wastewater By Hydrolysis Acidification-IFAS Process And Commissioning Operation

A large amount of slaughtering waste water is produced in the process of slaughtering livestock.At present,the treatment technology of slaughtering waste water mainly includes aerobic and anaerobic biological treatment,and aerobic biological treatment is generally combined with hydrolysis and acidification process.In order to take into account the advantages of activated sludge method and biofilm method,the biofilm-activated sludge composite process(IFAS)was developed,which has the advantages of large biomass,strong impact resistance and small floor space in the treatment of slaughtering wastewater.A slaughterhouse in Qiqihar produced 300 tons of wastewater per day,and the treatment capacity of wastewater treatment process cannot meet the demand,so it is necessary to transform.Aiming at the situation of the slaughterhouse wastewater produced and existing sewage plant sewage treatment technology and system research and analysis,for the modification of process units and test were carried out based on GPS-X software simulation test,finally to modify the original sewage treatment system and complete the debugging operation,realize the ultimate goal of upgrading.According to the production scale and production law of slaughterhouse,and considering the significant characteristics of slaughterhouse wastewater comprehensively,this study adopted the modification plan of hydrolysis acidification/mud film symbiosis process as the main process.Small trials,packing type is emphatically discussed,hydraulic retention time,packing filling ratio,the effects of the dissolved oxygen on the sewage treatment a preliminary conclusion,nissin spinning new packing better than ordinary suspended filler,hydrolysis acidification unit best HRT is 8 h,IFAS unit best packing filling ratio is 40%,the optimum DO 4 mg/L.Gps-x software was used to simulate the operation of sewage treatment engineering,analyze the changes in the concentration of COD,ammonia nitrogen,total nitrogen and other pollutants during the operation of sewage treatment process,calibrate the model and adjust the operating parameters with the monitoring data during the stable operation in off-season,and verify the sensitivity and accuracy at the same time.The adjusted parameters were used to simulate the treatment effect of the modified hydrolysis acidification-IFAS process.Based on the model,the sewage treatment process was analyzed,and the process operation was simulated in combination with the relevant conclusions and operating parameters of the pilot test.Effluent COD,ammonia nitrogen and total nitrogen are below 50mg/L and 30mg/L respectively.The optimumprocess parameters were verified: HRT of hydrolysis and acidification for 12 h,HRT of IFAS for 24 h,dissolved oxygen concentration of 4mg/L,sludge reflux ratio of 150%.Through the pilot test and GPS-X software simulation,the optimal parameters of the wastewater treatment process of this project were obtained,and the original process was reformed and started successfully.During the stable operation of the system,the enterprise operated at full load in the peak season of production,with the inflow of 300tons/day.After the slaughter wastewater was treated by the new system,the effluent COD concentration was stable below 50mg/L and the ammonia nitrogen concentration was stable below 20mg/L,meeting the design requirements and discharge standards.After the completion of the project renovation,it can greatly improve the surrounding ecological environment,and the cost of treating tons of water can save 19.5% compared with the original process,which has significant environmental and economic benefits.