H镇生活污水处理工艺设计毕业论文
2022-03-01 08:03
论文总字数：28802字
摘 要
本课题是研究某城镇的污水处理厂以及它的的选型，设计和计算，它的日平均处理量为12万吨。污水总变化系数为1.2，所以每日污水最大处理量为14.4万吨。设计采用的工艺为倒置A2/O法，工艺流程简单实用，在我国城镇污水厂中得到广泛应用，处理效果好，稳定性高，成本低，还有着不错的脱氮除磷的效果，本课题的最终水体质量要求达到《城镇污水厂污染物排放标准》一级B排放标准,并尽量提高终水体质量。污水的处理流程是粗格栅-污水提升泵房-细格栅-沉砂池-初沉池-倒置A2/O工艺-二沉池-接触池，最后经过计量堰排出。剩余污泥的处理流程是先浓缩，再脱水，最后做成泥饼运送至燃烧发电厂进行发电。通过上述工艺流程能够达到排放标准。
其中，格栅选用回转式格栅机，分为粗格栅和细格栅两道，两用一备；污水提升泵房是采用合建式泵房，四用两备，集水池的面积为62.5m2有效水深2m；沉砂池采用平流式沉砂池，共四座，池长12.5m，有效水深0.417m；初沉池采用平流式初沉池，共五座，沉淀部分水深4m，池长36m；缺氧池两座，容积6000m3，厌氧池两座，容积6000m3，曝气池采用鼓风曝气，设备为RG-400鼓风机，共两座，容积9100m3；二沉池采用幅流式二沉池，共四座，直径37m，有效水深3.3m；接触池采用五廊道式平流加氯接触池，共两座，廊道宽16.66m，有效水深2m；污泥浓缩池直径为9.02m，共1座；污泥脱水采用DY-1000带式压滤机，共两座。
关键词：污水处理 倒置A2/O 污泥处理 选型设计
Design of 120 thousand m3/d domestic sewage treatment process
Abstract
This graduation project is the design, calculation and design of a municipal waste water treatment plant with an average daily processing capacity of 120 thousand tons. The total coefficient of variation of sewage is 1.2, so the maximum amount of sewage treatment is 144 thousand tons per day.Process design using the A2/O inversion method, the process is simple and practical, widely used in urban sewage treatment plants in China, good treatment effect, high stability, low cost, and good effect of nitrogen and phosphorus removal, the effluent quality reached the design requirements of the "urban sewage treatment plant pollutant discharge standard" (GB18918-2002) a B emission standards, and to improve water quality.The sewage treatment process is a grid grit tank - primary sedimentation tank - inverted A2/O process - two sink - contact tank, and finally discharged through a metering weir. The excess sludge treatment process is concentrated in the first, nitrification, dehydration, and finally made of mud cake transported to the burning power plant for power generation.Through the above process, you can reach the "municipal wastewater treatment plant pollutant emission standards" (GB18918-2002) level B emission standards.
The grille is using rotary grille machine, respectively, the coarse grid and the fine grid, dual-use equipment; sewage pumping station is built by the pumping station, four by two, water pool area is 62.5m2 effective depth of 2m; sand pit using flat flow sand pool, a total of four seats, pool length 12.5m, effective the depth of 0.417m; the primary settling tank with horizontal flow type primary settling tank, a total of five seats, precipitation part depth 4m, pool length 36m; anoxic tank two, volume 6000m3, anaerobic pool two, volume 6000m3, aeration tank by aeration, the equipment for RG-400 blower, a total of two, volume 9100m3; the amplitude flow type two sedimentation tank two sedimentation tank, a total of four seats, the diameter of 37m, the effective depth of 3.3m; the five contact tank corridor type advection chlorine contact tank, a total of two seats, corridor width 16.66m, depth 2m; sludge thickening tank diameter is 9.02m, a total of 1; sludge dewatering by DY -1000 belt press filter, a total of two.
Key words: municipal wastewater; sewage treatment plant; inverted A2/O; sludge treatment
目录
摘要............................................................................................................................................I
Abstract......................................................................................................................................II
一.处理目的和任务 1
1.1设计规模 1
1.2城市自然状况 1
1.3污水水质 1
1.4水量换算表 2
二.处理方案的比选 3
2.1工艺比选 3
2.2工艺流程 4
三.工艺设计和计算 5
3.1进水闸门 5
3.2格栅 5
3.2.1格栅的设计计算 5
3.3污水提升泵房 9
3.3.1设计概述 10
3.3.2集水间计算 10
3.3.3水泵总扬程估算和校核 11
3.4沉砂池 11
3.4.1沉砂池的选型 11
3.4.2沉砂池的设计计算 11
3.5初沉池 16
3.5.1初沉池的选型 16
3.5.2初沉池的设计计算 16
3.6倒置A2/O工艺 20
3.6.1工艺流程和选择理由 20
3.6.2缺氧池的设计计算 20
3.6.3厌氧池的设计计算 21
3.6.4好氧池的设计计算 22
3.7二沉池 29
3.7.1二沉池的作用 29
3.7.2二沉池的设计计算 29
3.7.3污泥回流泵房 33
3.7.4进出水设计 34
3.8接触消毒池 36
3.8.1设置消毒池的原因 36
3.8.2消毒池的设计计算 36
四.污泥处理 39
4.1污泥处理的目的 39
4.3污泥处理的设计计算 39
4.3.1污泥浓缩的设计计算 39
4.3.2污泥脱水 43
五.污水厂的布置 45
5.1污水厂的平面布置 45
5.1.1概述 45
5.1.2平面布置的一般原则 45
5.1.3污水厂平面布置的具体内容 45
5.2污水厂的高程布置 46
5.2.1污水厂高程布置的主要任务 46
5.2.2污水厂高程布置原则 46
5.3高程计算 46
5.3.1高程计算的原理 46
5.3.2污水处理系统高程计算 46
5.3.3污泥处理系统高程计算 48
5.4污水泵房的设计 49
5.4.1泵房的平面布置 49
5.4.2泵房附属设施 49
参考文献 51
致谢 53
一.处理目的和任务
1.1设计规模
根据苏北某市H镇总体规划，拟建设一座12万m3/d的城镇生活污水处理厂，要求采用生物处理工艺，排放水体达到《城镇污水厂污染物排放标准》一级B排放标准,并尽量提高水体质量。
1.2城市自然状况
（1）地理位置：位于苏北地区。
（2）气温：：15.6℃，：37.9℃，：-9.5℃。
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