Operation Optimization Of A~2/O-MBR Process Under The Influent Loading Shocking

With the acceleration of economic development and urbanization,higher requirements are imposed on the discharge standards of sewage treatment plants.At the same time,increasing urban waste has also led to problems with high-concentration sewage treatment such as landfill leachate,and some urban sewage treatment plants face mixed treatment of landfill leachate or sludge treatment fluid,which affects the high standard treatment of sewage plants.This topic studies the operating characteristics of the A²/O-MBR process,and studies the operational differences between the A²/O-MBR process and the traditional A2/O process through model simulation.It focuses on analyzing and predicting the impact of influent loads such as landfill leachate and sludge treatment liquid during mixed treatment of the A²/O-MBR process treatment efficiency under different conditions;under the condition of separately mixing two kinds of highconcentration sewage with separate landfill leachate,sludge disposal liquid,and mixed treatment,obtain the better operating conditions parameters of the A²/O-MBR process in order to achieve the effluent stability to reach the surface quasi-Class IV standard;study the MBR membrane pollution under the condition of mixed treatment of high load sewage,and determine the membrane cleaning method.The A²/O-MBR process was simulated and analyzed by GPS-X software,and the dynamic parameters and sludge characteristics of the sludge in the system after A2/O combined with MBR were analyzed.The results show that under the same water intake conditions,the A²/O-MBR process The unit has a high removal efficiency of pollutants,which indicates that the combined microbial kinetics parameters in the A²/O-MBR process have been greatly improved and the microbial activity has been improved.The effects of different mixing ratios on process effluent under separate mixing of landfill leachate and sludge disposal solution were analyzed using a model,indicating that higher mixing ratios will cause total nitrogen and total phosphorus concentrations in the effluent,and that the mixing ratio will result in better effluent quality Difficult to reach quasi-IV standards.Under laboratory conditions,the effects of different mixing ratios on the operation of the A²/O-MBR process under the conditions of separately mixing landfill leachate and sludge mixture were studied.The landfill leachate and urban sewage were mixed respectively at a ratio of 1: 1000,1:500,and 1:200.It was found that the mixing ratio had a significant effect on the TN and TP concentrations of the effluent.Under the condition of a mixing ratio of 1: 200,the system effluent can not stably meet the "quasi-IV" water quality standard?TN ?10mg / L?.After adjusting the HRT,mixed liquid reflux ratio and MBR gas-water ratio,the treatment efficiency of total nitrogen and total phosphorus can be improved,and the operating conditions to achieve the effluent to reach the IV standard are: HRT is 10 hours,and the mixed liquid reflux ratio is 400 %,The air-water ratio is 20: 1,and the effluent COD,NH₄⁺-N,TN,and TP concentrations are 17.39 mg / L,0.26 mg / L,8.31 mg / L,and 0.12 mg / L.Under the conditions of separate mixed sludge disposal liquid treatment,the mixing ratio cannot exceed 1: 200,and the effluent can stably reach the "quasi-IV" quality standard for surface water.Investigate the effects of different mixing ratios?1:2.5:1000,1:5:1000,1:1.25:500,1:2.5:500?on the A²/O-MBR process during the mixed treatment of two highconcentration wastewater,and determine The best process parameters and mixing ratio,the mixing ratio should not exceed 1: 2.5: 500.Under the mixed treatment conditions,the characteristics of the membrane fouling layer were analyzed.The membrane fouling layer can be cleaned by physical and chemical cleaning methods,and the membrane flux recovery rate can reach 98.77%.