日处理20万吨城市生活污水处理厂设计

摘 要

本城市污水处理厂的工程规模达20万吨/日。为使出水达到国家综合污水排放标准（GB18918-2002）一级B标准同时贯彻执行“三同时”制度，取得更好的除磷脱氮的效果，故本次设计采用处理效率较高的卡鲁塞尔2000型氧化沟处理工艺。Carrousel 2000系统在普通Carrousel氧化沟前增加了一个厌氧区和绝氧区（又称前反硝化区）, 全部回流污泥和10-30%的污水进入厌氧区，可将回流污泥中的残留硝酸氮在缺氧和10-30%碳源条件下完成反硝化，为以后的绝氧池创造绝氧条件。同时，厌氧区中的兼性细菌将可溶性BOD转化成VFA，聚磷菌获得VFA将其同化成PHB，所需能量来源于聚磷的水解并导致磷酸盐的释放。厌氧区出水进入内部安装有搅拌器的绝氧区，所谓绝氧就是池内混合液既无分子氧，也无化合物氧（硝酸根）， 在此绝氧环境下，70-90%的污水可提供足够的碳源，使聚磷菌能充分释磷。绝氧区后接普通Carrousel氧化沟系统，进一步完成去除BOD、脱氮和除磷

关键词：城市污水；卡鲁塞尔2000型氧化沟；污泥浓缩脱水

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Plant design of urban sewage treatment up to 20 tons

per day Abstract

The plant scale of this project about urban sewage treatment up to 20 tons per

day.To meet the level B standard of the national comprehensive sewage effluent discharge standard (GB18918-2002) and implement the \and for the sake of the acquisition better divided by the phosphorus take off the nitrogenous result, this design will use the type of Carrousel 2000 oxidation ditch systems with high efficiency treatment . Carrousel 2000 systems increased a oxygen District before common Carrousel oxidize ditch with the unique oxygen area.( call again that the versa nitric in front turns the area)The dirty mire in all refluxes enters the anaerobic District with 10-30% dirty water, can under the anoxia with 10-30% carbon source term complete remaining of dirty mire in reflux inside nitric acid nitrogen to versa nitric to turn, creates for the unique oxygen pond of hereafter unique oxygen term.At the same time, anaerobic District inside of concurrently the sex germs convert the dissolubility BOD VFA, the germ acquire the VFA its assimilation PHB, the energy source needed solves in the phosphoric water and cause phosphatic releasing.The anaerobic District a water enters the inner part installs the unique oxygen area that have the mixer, the so-called unique oxygen is a pond inside to mix with liquid since have no the numerator oxygen, also have no the compound oxygen( nitric acid root), the here unique oxygen environment is next,70-90% dirty water can provide the enough carbon source, can make the germ of released the phosphorus well.The unique oxygen area connects behind the common Carrousel oxidizes the ditch system, further completing to do away with the BOD and take off the nitrogen with divided by the phosphorus .

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Key words: Arban sewage; Carrousel 2000 type oxidation ditch; Sludge

concentration dehydration

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目 录

摘 要 ........................................... 1 Abstract ......................................... 2 目 录 ........................................... 4 前 言 ........................................... 6 第一章 城市污水处理厂设计概况 .................... 8

1.1 设计概况 ..................................... 8 1.2 设计原则、范围与依据 ......................... 9 1.3 工程规模以及处理水质要求 ..................... 9 1.4 工艺流程的比较与选择 ........................ 10 1.5 本设计工艺流程的确定 ........................ 15 1.6 水处理构筑物设计说明 ........................ 15 1.7 污泥处理构筑物设计说明 ...................... 21 1.8 平面与高程布置 .............................. 23

第二章 城市污水处理厂设计计算书 ................. 27

2.1 泵前中格栅 .................................. 27 2.2 污水提升泵房 ................................ 29 2.3 泵后细格栅 .................................. 31 2.4 平流式沉砂池 ................................ 33 2.5 氧化沟 ...................................... 34 2.6 二沉池 ...................................... 39 2.7 接触消毒池 .................................. 42

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2.8 回流污泥泵房 ................................ 43 2.9 污泥浓缩池 .................................. 44 3.0 贮泥池及污泥泵 .............................. 47

第三章 高程计算 ................................. 48

3.1 水力计算 .................................... 48 3.2 水头损失计算 ................................ 48 3.3 高程确定 .................................... 49

结 论 .......................................... 51 参考文献 ........................................ 52 致 谢 .......................................... 53 附录1 外文参考文献（译文） ..................... 54 附录2 外文参考文献（原文） ..................... 56

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