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设计总说明：本设计所涉及的某污水处理厂位于天台县，其废水主要是来自该地区周围居民区的生活污水，污水量为10万m3/d，CODcr：300mg/L、BOD5：150mg/L、SS：180mg/L、NH3-N：25mg/L、TN：29mg/L
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经过对各生物法处理工艺的研究比较，确定采用卡鲁塞尔氧化沟，用以达到去除COD、BOD、脱氮目的。
在设计中，通过格栅截流较大的悬浮物或漂浮物；曝气式沉砂池是利用曝气作用，使泥沙和有机物分开，加速砂粒的沉淀，以达到除砂目的；卡鲁塞尔氧化沟脱氮效果好，相对来说，运行成本低，构造简单，系统处理污水的能力更加稳定，处理效率高，出水水质好。二沉池的主要作用是确保污水处理系统的出水水质；污泥浓缩池的主要作用就是降低剩余污泥的含水率，减少污泥的体积，方便后续处理。
根据确定的工艺流程，本设计通过对构筑物(包括格栅、曝气式沉砂池、卡鲁塞尔氧化沟、二沉池、紫外线消毒池和污泥浓缩池)主要尺寸的设计计算、水力损失及管路计算，完成了设计工艺说明、工艺流程图（含高层布置）、厂区平面布置图和主体构筑物单体图。
本设计具有技术上可行、经济上合理的效果。投资费用为7800万元，运行费用764.59万元/年。每吨水处理费用为0.34元。本设计具有总投资少，运行稳定、处理效果好，工艺简单，占地面积省，二次污染少等优点确保废水处理达标排放。
废水经处理后，预计可以达到城镇污水处理厂污染物排放标准》（GB18918-2002）一级标准的B标准，即：CODcr ≤60 mg/L；BOD5 ≤20mg/L；SS ≤20mg/L；NH3-N≤8mg/L；TN ≤20mg/L，达到消除污染、实现保护环境、造福人类的目的。21014
毕业论文关键词： 废水处理；卡鲁塞尔氧化沟；脱氮
Carrousel Oxidation Ditch Design for A Sewage Treatment Plant
General information of the design：The design involved a county sewage treatment plant is located in Tiantai, its water mainly from domestic sewage in the region. The initial design plans: The amount of sewage is 100000 m3/ d. The indicator of waste water quality standard is CODcr: 300mg/L、BOD5: 150mg/L、SS: 180mg/L、NH3-N: 25mg/L、TN: 29mg/L.
By comparing the research of several biology treating processes, the design uses the Carrousel Oxidation Ditch to remove COD, BOD, the nitrogen and TN
In design, through the closure of a large grid suspended solids or floating debris; aerated grit chamber is to use aeration to separate the silt and organic matter to speed up the sand in the sediment, in order to achieve grit objectives; Carrousel oxidation ditch is good at nitrogen and phosphorus removal, low operation cost, simple structure, capacity of sewage treatment system more stable, high treatment efficiency, good effluent quality; general secondary sedimentation tank's main role is to ensure the water quality of sewage treatment systems; sludge thickener main role is to reduce the remaining pollution soil moisture content, reducing the volume of sludge to facilitate the follow-up treatment.
In accordance with the established process, the design selects the process parameters of structures (including the grating, aerated grit chamber, Carrousel Oxidation Ditch, secondary sedimentation tank, UV disinfection and sludge thickening tank) and calculates the main size, the hydraulic loss, and finished of introduction of design process, process flow diagram, factory layout and main monomer structure map.
The design is technically feasible and economically reasonable results. The project cost 78.00 million yuan, invest-ment. Equivalent to the sewage treatment costs 0.34yuan / m3.The whole process designed can effectively save the project investments, reduce processing costs, reduce the space with a total investment of less stable, to ensure that emissions from waste-water reach the standard and it is a simple process.