Investigation and Analysis on Sewage Quality and Treatment Effect in Typical Expressway Service Areas
The investigation on sewage quality in expressway service areas is of great significance for the sewage treatment design and operation.The field survey and water quality monitoring were conducted in the typical expressway service areas with strong representativeness in terms of traffic volume and sewage discharge in Jiangsu province.The water quality variation characteristics in different time periods and different grade service areas were analyzed to provide reference for the sewage treatment process design and operation in service areas.The result indicates that the significant variations exist in the influent water concentrations in the expressway service areas with different grades,as well as in the different service areas with the same grade.Affected by the service area scale,functional difference,and the randomness of passenger number,the influent water quality of sewage treatment facilities has significant fluctuations every hour or even every month.The variation coefficients of COD,NH4+-N,and TN concentrations in the same service area during holidays can reach 2.50,2.21,2.31 respectively.The influent water concentration variation coefficients in different service areas are quite different and have no obvious variation rule.The analysis results of effluent water quality show that the sewage treatment facilities in expressway service areas generally have weak impact load resistance,low efficiency of nitrogen and phosphorus removal,and the effluent is difficult to reach the standard stably.Compared with the A2O process,the MBR process has higher removal efficiency of COD,NH4+-N,and TN.TP is mainly removed by using chemical phosphorus removal.The larger volume of adjustment tank can prolong the hydraulic retention time.It is helpful to improve the impact load resistance of sewage treatment system.It is found that the main problems of expressway service area sewage treatment are the basic data lack on water quality and quantity,mismatched design scale,unreasonable process,insufficient maintenance,and lack of supervision and management.Therefore,the corresponding countermeasures are supposed to put forward,e.g.,in-depth study on water quality and quantity,investment in suitable processes,strengthening operation and maintenance management,and implementing supervisory responsibilities.
environmental engineeringsewage treatmentfield studyexpressway service areawater quality changetreatment effect
NETL
NSTL
万方数据
