青岛市李沧区污水处理厂工艺设计
The process design of sewage treatment plant
of Licang county-town in Qingdao
题目名称: 青岛市李沧区污水处理厂工艺设计
学院名称: 班 级: 学 号:
学生姓名: 指导教师:
年 月
摘 要
本次毕业设计的题目为青岛市李沧区污水处理厂工艺设计。其污水排放量为32000 m3/d。原污水含有污染物种类及其浓度如下：
污染物 浓度（mg/l）
要求出水执行《城镇污水处理厂污染物排放标准》（GB 18918-2002）一级B标准。通过参阅相关资料，采用前加厌氧池的卡鲁赛尔氧化沟工艺。
在初步处理中,污水首先进入中格栅,用以去除较大的颗粒物,以免其对后续处理单元或工艺管线造成损害。中格栅后有污水提升泵提升污水进入细格栅。然后进入平流式沉砂池,用以去除密度较大的无机砂粒,提高污泥有机组分的含率。
在卡鲁塞尔氧化沟内沿着曝气器距离的增加,氧化沟内溶解氧浓度不断降低,呈现缺氧区好氧区的交替变化,出现硝化和反硝化的过程,达到脱氮的效果。同时厌氧池释放磷，好氧区吸收磷,达到除磷的效果。剩余污泥则经污泥提升泵提升至污泥浓缩脱水一
CODCr BOD5 332 210 SS 210 TN 36 NH3-N 22 TP 3 pH 6.0~9.0 体化装置。 出水达到了脱氮除磷的要求，防止了水体的富营养化，达到了工艺设计的目的。 关键词： 城市生活污水，脱氮除磷，卡鲁塞尔氧化沟
Ⅰ
Abstract
The topic of this graduate design is about the process design of Licang county-town in Qingdao.The wastewater discharge is 32000 m3/d. The contaminants and density of the wastewater are listed as follows:
Pollutant Density（mg/l）
The effluent water need reach The urban sewage treatment plant pollutant discharge standard (GB18918-2002) of level one B emission standards. According to interrelated literatures, the Carrousel oxidize with a anaerobic ditch process is selected.
In preliminary treatments, the sewage water enters coarse screen in order to remove bulk and floatable pollutant , in case that it affects the working of the following treatment and the pipeline .And then wastewater is promoted into the fine screen by pump .Finally the sewage enters the horizontal-fiow grit chamber , which is used to remove bigger inorganic sand and the density of organic material in mud can be improved by this way.
With the distance of aerator increasing in the Carrousel oxidize process , the dissolved oxygen density reduces,which allows the anoxic zone and the aerobic zone present in turn. Namely, it allows the nitrification process and the denitrification process appear in succession , achieving the effect of nitrogen removal . At the same time the anaerobic ditch releases the phosphorus and the aerobic zone absorbs the phosphorus, achieving the effect of phosphorus removal. The surplus mud is promoted into sludge dewatering integration device concentration by the sludge pump .
The quality of the effluent water reachs the nitrogen and phosphorus removal request and prevents the eutrophication of the effluent water, achieving the goal of the process design. Keywords: The urban domestic sewage ，The nitrogen and phosphorus removal ，
The carrousel oxidation ditch
CODCr BOD5 332 210 SS 210 TN 36 NH3-N 22 TP 3 pH 6.0~9.0
Ⅱ
目 录
引言 ...................................................................... 1 1 概论 .................................................................... 2
1.1 设计任务和依据 .................................................... 2
1.1.2 设计题目 ..................................................... 2 1.1.3 设计依据 ..................................................... 2 1.2 设计要求 .......................................................... 3
1.2.1 设计原则 ..................................................... 3 1.2.2污水处理工程运行过程中应遵循的原则 ........................... 3 1.3 青岛市李沧区简介 .................................................. 3
1.3.1 地理位置 ..................................................... 3 1.3.3 地形地貌 ..................................................... 3 1.3.4 气象水文 ..................................................... 4 1.4 污水处理程度计算 ................................................. 4
1.4.1 溶解性BOD5的去除率 .......................................... 4 1.4.2 CODCr的去除率 ................................................ 4 1.4.3 SS的去除率 .................................................. 4 1.4.4 总氮的去除率 ................................................. 4 1.4.5 氨氮的去除率 ................................................. 5 1.4.6 总磷的去除率 .................................................... 5 2 污泥处理构筑物设计计算 .................................................. 6
2.1 中格栅设计 ........................................................ 6
2.1.1 设计说明 ..................................................... 6 2.1.2 设计参数 ..................................................... 6 2.1.3 设计计算 ..................................................... 7 2.1.4 设备选取 ..................................................... 9 2.2 污水提升泵房设计 .................................................. 9
2.2.1 设计参数 ..................................................... 9 2.2.2 设计计算 .................................................... 10 2.2.3 设备选取 .................................................... 10 2.3细格栅设计 ........................................................ 10
2.3.1 设计说明 .................................................... 10 2.3.2 设计参数 .................................................... 11 2.3.3 设计计算 .................................................... 11 2.3.4 设备选取 .................................................... 13 2.4 配水井设计 ....................................................... 14
2.4.1 设计说明 .................................................... 14 2.4.2 设计计算 .................................................... 14 2.4.3 设计参数 .................................................... 15 2.4.4 设计计算 .................................................... 15 2.5平流式沉砂池设计 .................................................. 16
2.5.1设计说明 .................................................... 16 2.5.2 设计参数 .................................................... 16 2.6 厌氧池设计 ....................................................... 19
2.6.1 设计说明 .................................................... 19 2.6.2 设计参数及计算 .............................................. 19 2.6.3 设备选取 .................................................... 19 2.7 卡鲁塞尔氧化沟设计 ............................................... 19 2.7.1 设计依据与要求 .............................................. 20 2.7.2 设计计算 .................................................... 20
2.8 二沉池设计 ....................................................... 26
2.8.1 设计说明 .................................................... 26 2.8.2 设计参数 .................................................... 26 2.8.3 设计计算 .................................................... 27 2.9 接触消毒池与加氯间设计 ........................................... 31
2.9.1 设计说明 .................................................... 31 2.9.2 设计参数 .................................................... 32 2.9.3 设计计算 .................................................... 33 2.10 污水管径设计 .................................................... 34 3 污泥处理构筑物设计计算 ................................................. 35
3.1 设计说明 ......................................................... 35 3.2 浓缩池的设计 ..................................................... 35
3.2.1设计要求 .................................................... 35 3.2.2 设计参数: ................................................... 35 3.2.3 设计计算 .................................................... 36 3.3回流污泥泵房设计 .................................................. 39
3.3.1 设计参数 .................................................... 39 3.3.2设计计算 .................................................... 39 3.4均质池 ............................................................ 40
3.4.1设计计算： .................................................. 40 3.5脱水机房 .......................................................... 40
3.5.1设计计算 .................................................... 40 3.5.2污泥浓缩脱水一体化机 ........................................ 41 3.6贮泥池设计计算 .................................................... 42
3.6.1 设计参数 .................................................... 42 3.6.2 设计计算 .................................................... 42 3.6.3 设备选型 .................................................... 42 3.7 污泥管径设计 ..................................................... 42 4 污水处理厂平面布置和高程布置 ........................................... 43
4.1 厂址选择 ......................................................... 43 4.2平面布置 .......................................................... 43
4.2.1各处理单元构筑物的平面布置 .................................. 44 4.2.2管、渠的平面布置 ............................................ 44 4.2.3辅助建筑物的平面布置 ........................................ 44 4.3高程布置 .......................................................... 45
4.3.1 布置原则 .................................................... 45 4.3.2 污水高程计算 ................................................ 45 4.3.3 高程水头损失计算 ............................................ 45 4.3.4 构筑物高程确定 .............................................. 47 4.3.5 污泥高程计算 ................................................ 48