The Research Of One City's Second Sewage Treatment Process And The Design Of Main Structure

The construction of urban sewage treatment facilities has always been one of the first issue of promoting social and economic construction.In the 11th five-year plan,our country emphasized:the state encourages energy conservation and emissions reduction,establish a conservation-minded society.The country also clearly put forward at the same time,during the 11th five-year plan,the urban sewage concentrated rate is above 80%,in the "twelfth five-year"plan,our country continued to emphasize strengthening pollutant emissions and governance,speeding up the construction of urban garbage and sewage treatment facilities,intensifying prevention of the pollution of key river valleys.So that the standard ofpollutants are more strict,which makes the construction of urban sewage treatment plants face the new challenge,choosing a better process,allocationing resources reasonably is the key problem of the construction of the sewage plant.Therefore,the comparison of the scheme,the selection of design parameters,the budget of the cost has become a key issue in the construction of urban sewage plant.Put one second sewage treatment plant engineering as an example to illustrate the research,the research's content mainly includes the analysis of determining the water quality and the water yield,through the determination of water pollutant emission standards,deveolopping the optimal technology of sewage treatment process and the main structure design,at the same time,completing this project engineering budget,for the further project design and construction to provide a better preparation.According to the requirement of the city's environmental governance and urban development strategy,combined with the overall planning of urban development and the present situation of the city's west industrial park drainage system,for improving the quality of the the city's west industrial park's environment and the water environmental of the river in the city,on the basis of serious comparison of scheme to determine the city's second sewage treatment plant sewage disposal engineering plan.Designed the second sewage treatment plant of the city will service for west industrial park and town,the service of western industrial park covers an area of 2550 ha,and the service of the town covers an area of 2000 ha.Designed construction scale of industrial waste sewage is 40000 tons/day,sewage of the town is 10000 tons/day,in total is 50000 tons/day.After entering the city's second sewage wastewater treatment plant,the treated water will be discharged into Ma Jia river.Proposed sewage treatment plant's standard of the treated water will reach the national level in A,the standard is "urban sewage treatment plant pollutant discharge standard"(GB18918-2002)(hereinafter referred to as standard)According to the sewage's quality of the city's second sewage wastewater treatment plant,the secondary treatment process is anaerobic filter combined biological aerated filter process,the depth of the treatment process is coagulation sedimentation + biological activated carbon filter process,the sludge treatment process is using centrifugal sludge concentration dehydration integration machine to concentrate sludge dewatering,in this scheme as the foundation,the treatment of the design parameters optimization structures and design calculation,sanitary landfill after dehydration,and completed construction drawing design of anaerobic filter combined biological aerated filter process.The design size of single pool is 177.4×26.8×6.0,and engineering preliminary budget estimates for 2446.098 million yuan.Using anaerobic filter combined biological aerated filter process as secondary treatment process,coagulation precipitation + biological activated carbon filter process as depth treatment process,treated effluent water quality can reach the city sewage treatment plant pollutant discharge standard "(GB18918-2002)level of A discharge standards.The design water quality is CODcr?50mg/L,3OD5?10mg/L,SS?10mg/L,animal and plant oil?1mg/L,petroleum?1mg/L,molecular serfactant<0.5mg/L,TN?15mg/L,NH4+-N?5(8)mg/L,TP?0.5mg/L,chroma(diluted multiples)?30.