Tidal Biological Contact Oxidation Treatment Of Domestic Sewage In Small Railway Stations

Since the reform and opening up,China's economy has developed rapidly.As a major component of transportation,China's railway construction has also experienced rapid development.The growth of railway transportation lines has also caused an increase in railway stations,both in China's existing and new construction,a considerable number of stations in the railway stations are far away from the city,especially some small and medium-sized stations.As a result,domestic sewage from these stations and working areas cannot be connected to the city's drainage system.For a long time,the domestic sewage in these stations and work areas has been mostly free-discharged,which has caused some damage to the environment along the railway.The way of emissions has caused some damage to the environment along the railway.Although the amount of sewage at the small station is small,the amount of water changes greatly.If full-time sewage treatment personnel are involved in the operation cost,it is necessary to adopt a reasonable and efficient sewage treatment process,which results in less investment in sewage treatment and a high degree of automation,the operation is simple and easy to master.In this paper,the effects of different operating conditions of the single-column operation system and the dual-column operation system on the removal of COD,ammonia nitrogen,and total nitrogen in sewage are studied.Monitoring the water quality of some double-column operating conditions,so as to analyze the law of pollutant removal and preliminary search for pollutant removal mechanism;By observing the bio-phase composition of the tidal biological contact oxidation reactor and measuring the amount of volatile biofilms,the entire device's ability to remove contaminants and the removal effect from the microbe point of view were mainly concluded as follows:(1)During single-column operation,during the process of COD treatment by tidal biological contact oxidation system,prolonging the treatment time is beneficial to the removal of COD by the system,but excessively prolonging the treatment time can only lead to a decrease in the treatment capacity of the system,and cannot make the COD out of the water.Significant improvement.A larger flood/vacancy ratio favors the removal of COD,but an excessively large flood/evacuation ratio will result in a decrease in treatment capacity due to the limitation of reoxygenation conditions.In a single column operation system,the length of inundation and the vacant length are all important factors affecting the ammonia nitrogen removal efficiency.It is not possible to consider the effects of one factor alone;prolonging the treatment time is beneficial to the removal of ammonia nitrogen by the system.For the total nitrogen removal effect,prolonging the treatment time is beneficial to the system's removal of total nitrogen,and the larger submerged/empty ratio is also beneficial to the removal of total nitrogen in a single column operation system.The average removal rate of total nitrogen can reach 82%,which can make the effluent total nitrogen reach the national Class A emission standard.On the whole,for the single-column operation system,the removal of COD,ammonia nitrogen,and total nitrogen in both A4 and A4 conditions can not only ensure a high removal efficiency but also ensure a high volume load.(2)For the two-column operation system,the effluent COD and ammonia nitrogen can reach the national Class A emission standard under various operating conditions,so different submerged/vacant time schedules and whether the pre-aeration of the influent water does not treat COD and ammonia nitrogen Significant differences.Although the effluent quality of the tidal biological contact oxidation dual column operation system is better than that of the single column operation system,the volume load of the dual column operation system is lower than that of the single column operation system.Under the conditions of two-column operation,it can be seen that the submerged 1 hour of column 1 and the submerged 3 hour of column 2 submerged/vacuum time schedule are more conducive to the removal of total nitrogen;the influent aeration will promote the system Total nitrogen removal.After reversing the submerged time between column 1 and column 2 in B5 conditions,the system has a certain increase in the removal rate of total nitrogen.(3)Determine the effluent quality at different time periods under some operating conditions of the double column and observe the changes of COD,ammonia nitrogen and total nitrogen in the sewage.It is known that the removal of pollutants in the sewage is mainly concentrated in the early stage of the experiment,which is also related to the laboratory.The previous conclusions are the same,and at the same time,the reasons for the lower total nitrogen removal rate are also found.Nitrates in the system at the end of the treatment process lack the carbon source needed for denitrification,which hinders the denitrification process.(4)Observing the composition of the microbial phase in the Tidal Biological Contact Oxidation System,the tidal biological contact oxidation system is rich in the types of microorganisms and the long food chain.The original and epigenetic microorganisms such as rotifers,nematodes and worms are also present in biofilms.It can be initially judged that the water quality is good.When the tidal contact oxidation system is operated in a single column,the volatile biofilm is as high as 18 g/L,which is 13 g/L higher than that of the traditional biological contact oxidation system.When the double column is in operation,the amount of volatile biofilm in a single column is in contact with traditional organisms.Oxidation systems are similar,which shows that the tidal biological contact oxidation system has a large amount of microbial membranes and strong microbial activity,and is suitable for the treatment of domestic sewage with large variations in water quality and water volume.In summary,whether it is a single-column operation system or a dual-column operation system,the operation system has strong anti-shock load capability,and the effluent water quality is stable.Tidal biological contact oxidation is suitable for the treatment of domestic sewage with large variations in water quality and water volume.