摘 要

水是生命之源，我们生活中的各项活动都离不开水，近年来，我国的经济发展迅速，工厂数量不断增加，产生的工业废水水量不断增加，工业废水中的主要污染物有有机物、化学毒物、酸、碱、重金属等，如不对其进行处理，将增大城镇污水处理厂的工作负荷和处理难度，对环境和社会造成巨大破坏。“水俣事件”和“富山事件”就是由于工业废水污染造成的，所以工业废水必须处理得当，达到排放标准后才能排放，建设完善的污水处理站至关重要。

本次设计是某再生纸业2000 m³/d废水处理工程工艺设计，主要是针对废水的水质水量特点，选择合适的工艺流程，对废水进行初期处理，达到排放标准后排放到市政管网，由城镇污水处理厂处理后排放，本次设计的排放标准是《制浆》（GB3544-2008）。经过工艺比选，污水处理厂的生化处理主体工艺选用传统推流式曝气池，最终确定的污水厂内的污水处理流程为：污水→细格栅→调节池→钟式沉砂池→传统推流式曝气池→辐流式二沉池；污泥处理工艺流程为：污泥浓缩池→污泥污泥贮泥池→污泥脱水机房→泥饼外运。

在满足环境效益的同时也要兼顾经济效益，经过工程概算，该排水工程的总造价约468.2万元，单位污水处理成本为1.51元/吨，符合环境效益与经济统一的要求。经过初期评估，该工程如能完成设计要求，在满足其区域内的工业生产同时还能维护水体生态平衡，降低城镇污水处理厂的负荷。

关键词：污水处理；造纸废水；曝气池；活性污泥

ABSTRACT

Water is the source of life and an essential part of our life and production.With the continuous development of the economy,the number of factories is increasing.And the wastewater generated in industry are continuously increasing.The main pollutants in industrial wastewater include organic matter, chemical poisons, acids, bases and heavy metals.If it is not properly treated, it will increase the workload and treatment difficulty of urban sewage treatment plants and cause huge damage to the environment and society.Japan's "Minamata" incident, the Northeast cadmium rice incident has vividly noticed.Therefore, industrial wastewater must be properly treated and can only be discharged after meeting the emission standards.It is of great importance to build a complete sewage treatment station.

This design mainly involves the process design of 2000 m³/d wastewater treatment engineering in a certain recycled paper mill.It mainly involves selecting appropriate process flow scheme according to the characteristics of water quality and water quantity.The industrial wastewater undergoes initial treatment and then it enters the drainage pipeline after the water quality reaches the standard.The emission standard of this design is the water pollutants for paper industry.After process comparison and engineering calculation, the main biochemical treatment process of the sewage treatment plant adopts the traditional push-flow aeration tank.The sewage treatment process in the finalized wastewater treatment plant is: sewage → fine screens → regulating tank → grit chamber → aeration tank → secondary sedimentation tank; Sludge treatment process: sludge thickening tank →sludge silt pool → sludge dewatering filter house → Outbound.

While meeting the environmental benefits, we must also take into account the economic benefits. After the project estimates, the total cost of the drainage project is about 4.862 million yuan, the unit sewage treatment cost is 1.51 yuan/ton, and the combined environmental benefits and economic unity requirements. After initial assessment, if the project can complete the design requirements, it will be able to ease the water pollution in this area,and at the same time reduce the workload of urban sewage treatment plants.

Keywords: Sewage Treatment；Papermaking wastewater；Aeration Tank；Activated sludge

目 录

第1章 绪论 1

1.1设计任务 1

1.2设计依据 1

1.3设计原则 2

1.4设计规模 2

1.5进出水水质 2

第2章 处理工艺比选 3

2.1废水的特点 3

2.2再生纸厂废水处理方法 3

2.2.1物理处理方法 3

2.2.2生物处理技术 4

2.3工艺比选 6

第3章 构筑物设计计算 9

3.1格栅 9

3.1.1 9

3.1.2设计计算 9

3.2调节池 11

3.2.1设计参数 11

3.2.2设计计算 12

3.3钟式沉砂池 13

3.4传统推流式曝气池 15

3.4.1设计参数 15

3.4.2设计计算 15

3.5辐流式二沉池 20

3.5.1设计参数 20

3.5.2设计计算 21

3.5.3设备选型 23

3.5污泥处理系统 24

3.5.1污泥浓缩池 24

3.5.2贮泥池 26

3.5.3污泥脱水车间 26

第4章 污水处理厂总体布置 28

4.1污水处理厂平面布置 28

4.2污水处理厂高程布置 29

4.2.1污水厂高程布置原则 29

4.2.2污水高程水力计算 29

第5章 工程预算 32

5.1厂区人员编制 32

5.2投资估算 32

5.2.1土建计算 32

5.2.2设备采购 34

5.2.3总投资 35

5.3污水处理成本 36

结论 39

致谢 40

参考文献 41

第1章 绪论

再生纸厂产生的废水是典型的工业废水，在本次某再生纸业废水处理工程工艺设计中，废纸在、粉碎分离、、清洗等工艺中产生的是主要的污染源，不会产生像生产木浆或，排放的高浓度，有机污染负荷相对较低，废水中含有维素、有机酸、、悬浮物和色素类物质油墨等，本次设计中再生纸厂废水量较小，但是成分复杂，并有一定的毒性^[1]，所以要设计合适的处理工艺处理达标后排放，减少对环境的破坏。

1.1设计任务

（1）工艺比选

根据废水水质水量的状况选择一套最合适的流程，并画出。