Research On The Odor Diffusion Mechanism And The Optimization Of Ventilation Schemes In The Sump Of Sewage Pump Statio

The various treatment units of the urban sewage pumping station will generate unpleasant odor gases during normal operation,which will seriously affect health and the quality of surrounding residents' life.Therefore,the problem of malodor emission has become the focus of attention.In order to effectively control the diffusion of malodorous gases,this paper takes a wastewater treatment plant in Changzhou as the research object,and studies the odor diffusion mechanism of the collection basin of the sewage pumping station,the optimization of airflow organization between the collection basin and the grille,and the deodorization effect.By Proving the odor diffusion mechanism and the optimal ventilation program,it can provide reference for the treatment of the stench problem of the same type of sewage pumping station.Firstly,this article summarizes the research status at home and abroad,and analyzes the source,composition and classification,pollution status and harm to human body of the odorous gas in the sewage pumping station.Secondly,through the establishment of diffusion mass transfer mathematical model,the analytical solution of the odor gas concentration in the collection basin was obtained by using the integral variation method,and the influencing factors of indoor odor concentration distribution,emission rate and emission were discussed.Then the computational fluid dynamics method was used to study the air flow and odor removal in the sump of the sewage pumping station.The advantages and disadvantages of the existing exhaust methods were analyzed,and the odor removal effect was simulated.Finally,numerical simulation methods were used to analyze the influence of the air supply system on indoor air pollutants in the air supply system between the grids and the continuous release of contaminants in the grid openings.At the same time,it explored the best ventilation between the grilles.The main work and research results of this paper are as follows:1.The odor mass transfer mathematical model of the pump station was established,and the odor emission rule of the sewage pump station was obtained:that is,the concentration and the emission rate of the odorous gas in the room and the surface odor gas gradually decreased with time,and finally stabilized.The total emission of odorous gases rapidly increases with the increase of the sparging rate,and decreases slowly with the decrease of the sparging rate.2.The analysis found that the influencing factors of the sparging rate and the sparging volume:by increasing the mass transfer coefficient,the mass transfer coefficient and the air exchange rate on the surface of the pool water,the concentration of odorous gases in the room can be reduced,and the interface separation coefficient and the malodorous gases in the sewage can be increased.The initial concentration will lead to an increase in the concentration of indoor malodorous gases.This conclusion can provide a theoretical basis for the pollutant emission and exhaust of pumping pools and sewage pools.3.It has found that the existing air outlet of the catchment,which has a downward air outlet method,has a low airflow velocity and a small wind velocity around the air outlet,which is not conducive to the formation of a negative pressure and suppresses the odor spillage.And the removal of contaminants in the pool is not ideal.Therefore,the numerical simulation of the discharge mode of the water collecting basin was optimized.It has found that the long exhaust air outlet and the side exhaust air is located on the other side of the air inlet.The air distribution in the pool is ideal and the deodorization effect is the best.4.The simulation of the existing air supply system between the grids shows that the existing air supply system is not conducive to the removal of pollutants in the grids and seriously affects the air quality in the grids.Through numerical simulation,it has found that the air supply method in which the air supply pipe is located between the grille and the doorway can ensure that the flow route does not pass through the contaminant emission surface and is beneficial to the health protection of the personnel.'Therefore,this partial exhaustion can be used to improve the hygienic conditions between the grills.