The Feasibility Study Of A Sewage Treatment Plant Project In Liaoning

City sewage treatment has been regarded as a public welfare undertakings,although the city sewage treatment industry in our country has made some achievements,but in the city sewage treatment process of sewage treatment,there has been insufficient investment and low efficiency of the overall operation of the sewage treatment industry problems.In the Eleventh Five-Year Plan,programming points out,strengthen the pollutants emission reduction and management,to speed up the urban sewage treatment,garbage disposal facilities,increase the prevention and control of water pollution in key river valleys strength,strict standards for pollutants discharge and environmental impact assessment.From that,the urban sewage treatment infrastructure construction at present and in the future is still a very long period the social economic construction is one of the important problems.More strict standards and resource conservation and environment friendly society the construction goal,to the city sewage treatment plant construction in the choice of technological scheme optimization and resource to rational allocation and use put forward higher request.So,for urban sewage treatment process program of research and design optimization of parameters will become the sewage treatment plant construction of the necessary premise.The city’s industrial and agricultural development is rapid,but the city streets around the drainage facilities construction and city development is not harmonious,resulting in the city river and the surrounding waters are seriously polluted,directly affect the quality of life of residents and the quality of the environment,but also affect the development of city agriculture and fishery in the Yellow Sea sea area.Public urged to speed up the municipal drainage facilities construction,improve the ecological environment of the city and the surrounding area of the city,so the construction of sewage treatment plants and supporting pipe network is a pressing matter of the moment.The engineering of the city sewage treatment plant as a case study,the research content includes the analysis of sewage treatment plant water quality and identify,analyze and process plan selection and design parameters optimization.According to the development plan of the city,using three kinds of methods for water consumption per capita comprehensive index method,unit construction land index method and the different nature of land for water consumption index of the region to the content of reasonable forecast,the city sewage treatment plant design capacity of 20000 m3/d.Refer to the domestic similar scale treatment plant influent water quality,water quality determination of plant design for SS=220mg/L,the sewage treatment,BOD5=200mg/L,CODcr=430mg/L,NH3-N=25mg/L,TP=4mg/L.Combined with the actual situation and the design requirements of the city sewage treatment plant,through the analysis and comparison of the two grade treatment process and advanced treatment process and sludge treatment process of the wastewater treatment plant,can make the effluent quality reached the"urban sewage treatment plant pollutant discharge standards"(GB18918-2002)a A emission standards,to meet the design requirements the factory,at the same time the construction of the economic analysis and the benefits of the project,designed and calculated parameters economic analysis and the benefits of the project,designed and calculated parameters optimization and design of the structure,to determine the sewage treatment project and completed the design of construction drawing.The sewage treatment plant selection cast process for the secondary treatment process,The depth of treatment by static mixer,pipeline grid flocculation tank,inclined plate sedimentation tank,dynamic cloth filter treatment process.The sludge treatment uses aeration process,and the sludge is concentrated,dewatering,sludge dewatering,and deodorant process is chosen for biological deodorant..The effluent quality of the treated effluent is reached "the pollutant discharge standard(GB18918-2002)of the urban sewage treatment plant" and the A discharge standard of the first grade.Meet the design requirements of the sewage treatment plant,but also for other sewage treatment plant design to provide a reference.