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The main task of the design is based on the design task book, the original data and information to complete the design and calculation of sewage treatment , sewage water quality based on topography and other relevant information , to determine the flow of sewage and wastewater treatment , sewage treatment calculate the size of structures , the total sewage treatment station layout plan and elevation map and sectional view of part of the structure of the flat . Water pollution control theory to develop environmental engineering students to use learned , comparing sewage treatment system master plan , optimize , and design parameters of the main structures and structural calculations, major equipment modeling ( including grille, lift pump , exposure scrubber sludge dewatering machine , etc. ) .
According to "Shanghai Integrated Wastewater Discharge Standard " (DB31/199-1997) two standard outdoor drainage design specifications (GBJ14-87) / water supply and drainage structures, construction engineering design specifications for acceptance (GBJ69-84), water treatment equipment manufacturing design conditions (JB923-86), factories and enterprises noise standard factory sector (GB12348-90), the regional environmental noise standards cities (GB3096-93), welded steel pressure vessel (JB/T4735-1997), lighting design of industrial enterprises (GB50034-92), architectural design waterproof specification (GBJ46-87), practical experience and other relevant parameters design specifications , my unit completed similar projects .
Wastewater treatment process in the selection of the program should meet the following principles: ( 1 ) adhere to the scientific reliability engineering practice and learn from experience with similar wastewater treatment , advanced technology and strive to facilitate the management , simple operation, no secondary pollution, low maintenance , reliable high degree . (2 ) treated wastewater discharge standards , reduce pollution of the receiving water body , with minimum capital investment seeks to maximize social, economic and environmental benefits. ( 3 ) try to reduce the amount of sludge , digested sludge in the system seeks to reduce investment and operating costs of sludge treatment . ( 4 ) maximize the use of advanced and reliable automation and control system to improve the management of wastewater treatment plant , reduce labor intensity .
In wastewater and sludge treatment process design process should be based on the following principles: ( 1 ) to determine the design parameters based on wastewater quality , quantity and variation , and to ensure that the calculation process as accurate as possible in detail. ( 2 ) In determining the process equipment , and strive to achieve high quality , reliable, easy to manage , easy to operate and make investments, lower operating costs. ( 3 ) drawings and calculations drawn writing format should meet the requirements .
The sewage treatment plant design sewage flow is Q = 20000m ³ / d, drainage population of 20,000 people , water conditions sewage generated is : COD = 800mg / L; BOD5 = 350mg / L or so ; SS = 350mg / L; TN = 40mg / L; PH = 6-9. Water quality requirements for the treated effluent : COD = 100mg / L; around BOD5 = 20mg / L; SS = 20mg / L; NH3-N = 15mg / L; PH = 6-9. Higher nitrogen content of raw sewage , after comparing the advantages and disadvantages of the various processes , the choice of A / O process . It features simple process , low investment cost , good sedimentation effect . For medium to large municipal wastewater treatment plant.
KeyWords:Water pollution; biological wastewater treatment; A / O process; sewage treatment process
目录
1. 设计概述 1
1.1 设计依据及设计任务 1
1.1.1 设计题目： 1
1.1.2 设计内容和要求： 1
1.1.3 设计原始资料： 1
2. 城市污水处理方案的确定 2