制革厂废水处理设计—毕业设计论文.

摘 要

废水处理厂设计规模 3000m 3

/d ，设计水质水量为：

Q=3000m 3/d ，COD cr =1800～3000mg/L ， PH=7.5～10，SS=700～1000 ㎎/l ，BOD=800～1200㎎/l,色度200～400 倍。经处理后，应达到下列出水水质：COD≤300mg/L，色度≤80倍，SS≤150mg/L, BOD 达≤100 mg/L,即达到《污水综合排放标准》（GB8978-1996）中制革行业的二级标准。

本工程方案设计依据有关环境保护在污水中的要求，采用混凝沉淀—接触氧化工艺处理制革废水，在详细方案比较的基础上，选择了如下处理工艺流程：

经设计可知COD 的去除率为93.6%, SS 的去除率为90.4%,色度去除率为82%。

格栅 初沉池 调节池 混凝沉淀池

接触氧化池

二沉池 集泥井

污泥浓缩池 脱水间 泵房 污泥外运 出水 制革废水

经技术经济分析，此方案投资总额 457 万元，废水处理成本为1.53元/ m3，有着良好的经济效益和社会效益。且节约用地、提高绿化、降低能耗的理念在设计中得到充分的实践，符合新时代环保的要求。

关键词：制革废水混凝沉淀接触氧化

Abstract

The designing scale of waste water treatment plant is 3000 m3/d, the designing quality and quantity of water are: Q=3000m3/d ，COD=1800～3000mg/L , BOD=800～1200㎎/l ，PH=7.5～10 ,SS=700～1000 ㎎/l , Chroma =200～400 times. After disposing of it, the quality of water should attain the following standards: COD≤300mg/L,SS≤150mg/L，Chroma ≤ 80 times，BOD ≤100 mg/L ,reaching the second standard (GB8978-1996）of 《integrated wastewater discharge standard》.

The designment of this project is in accordance with requirements of the environmental protection in the wastewater. It uses the contact oxidation process -coagulating sedimentation process to deal with the

wastewater in tanning industry. Based on comparison of the detailed program, we select the following processes: tannery wastewater →Grids→primary sedimentaion tank

→balance pond→contact oxidation process→ coagulating sedimentation→secondary clarifier→Drainage

sludge treatment process:enrichment→sludge

dewatering→outbound logistics

Through designing, we can know that the result of COD is 90.6%,ηSS is 90.4%, Chroma is 82%.

After technical and economic analyzing, the investment amount of this project is 4.57million Yuan, and the cost of disposal of waste water is 1.53 Yuan/ m3. It not only gains good economic and social benefits, but also fully puts the ideas of saving land economically, improving virescence and reducing energy consuming into the practice while designing, which is in conformity with new era environmental needs.

KEY WORDS: tannery wastewater ，contact oxidation process，coagulating sedimentation

目录

前言 (1)

第一章绪论 (2)

1.1 制革废水的产生及特点 (2)

1.2 制革废水的水质及水量分析 (4)

1.2.1不同工序排放的废水水质 (4)

1.2.2废水水量 (4)

1.3 制革废水的危害 (5)

1.4设计任务 (6)

1.4.1 本毕业设计课题的目的和要求 (6)

1.4.2本毕业设计课题的技术要求与数据 (7)

第二章工艺流程确定 (8)

2.1 制革废水概况 (8)

2.2工艺流程比选、确定说明 (8)

2.2.1方案设计原则 (8)

2.2.2制革废水处理工艺 (9)

2.2.3制革废水处理工艺组合 (10)

2.3工艺方案分析选择： (10)

2.3.1混凝沉淀法 (10)