摘 要
本设计的任务是处理量10万吨/日城市生活污水处理厂的初步设计，采用卡鲁塞尔2000氧化沟二级生化处理工艺。该工艺对废水处理具有明显的技术优势，并且具有很强的抗冲击负荷能力，提高了BOD5的去除率，氧化沟出水经二沉池接触消毒后排放。预计本方案BOD5的去除率可达95%，SS的去除率可达90%。考虑到污泥机械脱水间的运行安全，将二沉池等处理构筑物的污泥一并浓缩后去机械脱水间脱水，经压滤后外运。并且该工艺运行稳定、管理方便、工程投资少、运营成本低。污水处理厂工程总投资12384万元，污水处理总成本2985万元/年，污水处理成本0.818元/立方米。污水处理厂出水水质：CODcr≤20 mg/L，BOD5≤15 mg/L， pH=6-9，SS≤20 mg/L，NH3-N（10℃）≤5 mg/L，TN≤12 mg/L(10℃)，出水排入C江。
关键词：城市污水 Carrousel 2000氧化沟工艺 脱氮除磷 工艺设计
I
Abstract
The task of this design is to the preliminary design of 100,000 tons/day city life sewage treatment plant, use carrousel 2000 oxidation ditch secondary biochemical process. The process on wastewater treatment has the obvious technical advantage, and has a strong impact resistant load ability, has improved BOD5 , the oxidation ditch removal by the second pond water after contact disinfection emissions. The scheme is expected to the removal rate of 95% BOD5, SS had to 90%. Considering the sludge dewatering of mechanical safety operation, between second pond processing structures together after the sludge concentration to mechanical dewatering pressure filtration dehydration, between the after sinotrans. And this process stable in operation and easy management, engineering less investment, operation cost is low. This sewage treatment plant engineering total investment is 12384 million yuan, sewage total cost is 2985 , about 0.818 yuan per m3. Sewage effluent is: CODcr acuities 20 mg/L, more than 15 mg/L BOD5, pH = 6-9, SS acuities 20 mg/L, NH3 - N (10 ℃) more than 5 mg/L, TN acuities 12 mg/L (10 ℃), effluent into C river.
Keywords：Urban sewage Carrousel 2000 oxidation ditch process nitrogen and phosphorus removal Process Design
目录
II
摘 要 .......................................................................................................... I Abstract ....................................................................................................... II 1 前 言 ..................................................................................................... 4 2 文献综述 .................................................................................................. 1
2.1 我国污水处理现状 ........................................................................... 1 2.2 我国城市污水处理工艺 ..................................................................... 2 2.3 污水处理厂优化设计研究.................................................................. 2
2.3.1 历史回顾 ............................................................................... 2 2.3.2 模型发展 ............................................................................... 3 2.3.3 存在的问题 ........................................................................... 3 2.4 Carrousel氧化沟工艺 ...................................................................... 4
2.4.1 概述 ..................................................................................... 4 2.4.2 Carrousel氧化沟的结构和原理 ................................................ 5 2.4.3 优点 ..................................................................................... 6 2.4.4 Carrousel氧化沟演变 ............................................................. 6
3 方案比较 .................................................................................................. 7
3.1 设计依据 ........................................................................................ 7
3.1.1 设计背景 ............................................................................... 7 3.1.2 设计原则 ............................................................................... 7 3.1.3 设计依据 ............................................................................... 7 3.2 厂址选择 ........................................................................................ 9 3.3 污水处理工艺流程方案比较及选择 .................................................... 9
3.3.1 工艺方案分析 ........................................................................ 9 3.3.2 目前常用的城市污水处理技术 ................................................10 3.4 工艺的比选 ....................................................................................12 4 工艺流程 .................................................................................................13 5 总平面布置 ..............................................................................................14
5.1 水力计算 .......................................................................................14 5.2 高程计算 .......................................................................................14 6 设备选择与计算 .......................................................................................18
6.1 设计流量 .......................................................................................18 6.2 中格栅 ...........................................................................................18
6.2.1 设计参数 ..............................................................................18 6.2.2 设计计算 ..............................................................................18 6.3 进水泵房 .......................................................................................20 6.4 细格栅 ...........................................................................................21
6.4.1 设计参数 ..............................................................................21 6.4.2 设计计算 ..............................................................................21 6.5 沉砂池 ...........................................................................................23
6.5.1 设计参数 ..............................................................................23 6.5.2 沉砂池尺寸 ..........................................................................23 6.5.3 集砂量及排砂设备.................................................................25 6.5.4 曝气系统 ..............................................................................26 6.6 氧化沟 ...........................................................................................27
6.6.1 设计参数 ..............................................................................27 6.6.2 设计计算 ..............................................................................27 6.7 二沉池 ...........................................................................................33
6.7.1 设计参数 ..............................................................................33 6.7.2 设计尺寸 ..............................................................................33 6.7.3 刮泥设备 ..............................................................................37 6.8 接触消毒池 ....................................................................................37
6.8.1 设计参数 ..............................................................................37 6.8.2 设计计算 ..............................................................................38 6.8.3 计量槽 .................................................................................39 6.9 污泥泵房 .......................................................................................39
6.9.1 设计参数 ..............................................................................39 6.9.2 污泥泵 .................................................................................39 6.9.3 集泥池 .................................................................................40 6.10 污泥浓缩池 ..................................................................................40
6.10.1 设计参数 ............................................................................40 6.10.2 设计计算 ............................................................................41 6.11贮泥池 ..........................................................................................42 6.12 脱水机房 ......................................................................................43 6.13 配水井 .........................................................................................44 7 经济分析 .................................................................................................46
7.1 土建费用造价列表 ..........................................................................46 7.2 直接投资费用 .................................................................................47 7.3 运行费用计算 .................................................................................47
7.3.1 动力费用 ..............................................................................47 7.3.2 人力成本 ..............................................................................48 7.3.3 生产用水水费开支.................................................................48 7.3.4 运费 ....................................................................................48 7.3.5 维护维修费用 .......................................................................48 7.4 管理费用 .......................................................................................48
7.5 运行成本核算 .................................................................................48 8 致 谢 ....................................................................................................49 9 参考文献 .................................................................................................50
1 前 言
随着我国城市建设的发展和城市化进程的加快,城市水污染问题日益突出,城市污水处理已经成为当前水污染治理的重点。长期以来,我国城市基础设施的发展与人口、资源、环境和工业建设不协调,导致基础设