| With the development of economy,the problem of water resources and water pollution is highlighted increasingly.It is very important to improve and purify the water as the same as saving the water resource.Biological treatment is widely used in the treatment field of urban sewage and industrial wastewater,and as one of the biological treatment,the biofilm method get more and more attention of people because of its advantage,such as,less investment,low operation cost and good treatment effect.It has done some improvements on the basis of the Atmosphere-Exposed Biofilm system and the original and modified Atmosphere-Exposed Biofilm system as the research object,temperature as the variable,to investigated the processing characteristics of sewage in original and modified Atmosphere-Exposed Biofilm system with different temperature.At the same time,PCR-DGGE technology was used to analyze the microbial community structure of Atmosphere-Exposed Biofilm system under the condition of different temperatures and the influence of temperature on degradation of pollutants on the system was be analyzed from the microscopic view.Then,the Phelps equation was used to obtain a generalized estimate of the influence of temperature on kinetics.Finally,The ability for resisting shock load and economy energy consumption of the modified Atmosphere-Exposed Biofilm system were be used for feasibility analysis.The following conclusions were drawn from the study:1)The concentration of COD,TN and TP in the effluent of the Atmosphere-Exposed Biofilm system was falling with the temperature rising in the range of 10-35℃.The removal rate and removal efficiency of COD and TP increased with the rise of temperature,the maximum changes in the removal rate and removal efficiency of COD and TP were observed when the operating temperature raising from 15℃ to 20 ℃.As temperature rise,the removal rate and removal efficiency of TN declined after first increasing,the maximum value observed at 30℃.2)With the change of the temperature in the AEB system,the Shannon-Wiener index and Dice index were changed,the succession in the microbial community was significant.The dominant strains were Flavobacterium oncorhynchi and Parachlamydia acanthamoebae UV-7(low temperature).Uncultured bacterium TB127-12,Undibacterium parvum,and Uncultured bacterium bf1-54 were the significant dominant strains(medium-high temperature).3)The concentration of COD,TN and TP in the effluent of the modified Atmosphere-Exposed Biofilm system was falling with the temperature rising in the range of 10-35℃.The removal rate and removal efficiency of COD increased with the rise of temperature in the modified Atmosphere-Exposed Biofilm system which were improved compared with the Atmosphere-Exposed Biofilm system.The removal rate and removal efficiency of TN and TP increased with the rise of temperature in the modified Atmosphere-Exposed Biofilm system.The removal rate of TN and TP were improved compared with the Atmosphere-Exposed Biofilm system in the range of 10-20℃ and 35℃ which means that the modified Atmosphere-Exposed Biofilm system have certain ability to stand the change in temperature.For the removal efficiency of TN in the modified Atmosphere-Exposed Biofilm system was improved in the range of 10-20 ℃(low temperature)and 35℃(high temperature)and the removal efficiency of TP improved in all different temperature.4)There is a correlation between temperature and the degradation rate of pollutants(K)in the original and modified Atmosphere-Exposed Biofilm system.The temperature coefficient of COD,TN and TP in Atmosphere-Exposed Biofilm systems was 1.0062,1.0727 and 1.0336,respectively,the influence of temperature on the TN was the highest,followed by TP;the influence on COD was the lowest.The temperature coefficient of COD,TN and TP in the modified Atmosphere-Exposed Biofilm system was 1.0073,1.0297 and 1.0306,respectively,the influence of temperature on the TP was the highest,followed by TN;the influence on COD was the lowest.Temperature and the system response speed between before and after the improvement of Phelps model validation results,the model can better predict a certain temperature conditions,the original and modified Atmosphere-Exposed Biofilm system of COD,TN and TP removal rate.5)Comparison and analysis the characteristics and economic of modified Atmosphere-Exposed Biofilm system and XiaoYing town sewage treatment plant in Yanji,the results show that,the modified Atmosphere-Exposed Biofilm system has a stronger ability for resisting shock load than the Xiaoying town sewage treatment plant,while the modified Atmosphere-Exposed Biofilm system has a lower energy consumption than the Xiaoying town sewage treatment Plant,the modified Atmosphere-Exposed Biofilm system has strong field adaptability in Yanbian area. |
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