焦化废水处理 设计说明书

1200t/d焦化废水处理工程设计

张汉德

摘要

本设计是1200t/d焦化废水的处理设计，在本设计的原水含有化学需氧量COD Cr为2800-4000mg/L，生化需氧量BOD5800-1200mg/L,悬浮物SS200-500mg/L, pH6-9, 氨氮NH3+-N300-800mg/L。处理后水质要求达到《污水综合排放标准》。

本设计选定了A2/O（厌氧—缺氧—好氧）处理工艺对焦化废水进行处理。通过格栅、气浮浮选去除油粒等杂质，然后再通过A2/O 生化法进行脱氮处理，生化出水进入混凝反应器进一步去除COD，经过后续的平流沉淀池和混凝沉淀池处理后，保证出水水质符合要求。而污泥则统一交于专业的环保公司处理。

经过处理后，出水将会达到化学需氧量COD C=60mg/；生化需氧量BOD5=20mg/L；悬浮物SS=20mg/L；氨氮NH3+-N =15mg/L；pH =6-9。符合本设计要求的标准。

通过设计计算确定了各构筑物的尺寸以及设备的选型，对系统的操作和控制做出说明，并对此项目投资及运行费用作出了概算。

经过计算，本设计的土建费用达到134832.48元，设备费用达到250500元。总投资费用为385332.48元。本设计的运行费用为1.16元/吨废水。

从技术、经济指标上看，本设计是可行的。

关键词：焦化废水，NH3+-N，A2/O（厌氧—缺氧—好氧）处理工艺

1200t/d of coking wastewater treatment engineering design

Zhang Hande

Abstract

The design is 1200t / d of coking wastewater treatment design, in the design of the raw water contains a chemical oxygen demand COD Cr for 2800-4000mg / L, biochemical oxygen demand BOD5 800-1200mg / L, suspended solids SS 200-500mg / L, pH6 -9, ammonia NH3+-N 300-800mg / L. Required water quality treatment, "Integrated Wastewater Discharge Standard."

The design selected A2 / O (anaerobic - anoxic - aerobic) process for coking wastewater treatment. Through the grille, air-flotation to remove impurities such as oil tablets, and then through the A2 / O nitrogen removal method to deal with chemical and biological, chemical and biological reactor effluent into the coagulation further remove COD, after a follow-up to the stratosphere and mixed sedimentation tanks condensate after sedimentation tanks to ensure water quality meets the requirements. The sludge is uniform in cross-professional company to deal with environmental protection.

After treatment, the water will reach the chemical oxygen demand COD Cr = 60mg /L; Biochemical Oxygen Demand BOD5 = 20mg / L; suspended solids SS = 20mg / L; Ammonia NH3+-N = 15mg / L; pH = 6-9 . Design requirements in accordance with the standards.

Through the design and calculation to determine the size of the structures, as well as

equipment selection, system operation and control of explanation, and the project investment and operating cost estimates made.

After calculation, the design of the construction costs to achieve 134,832.48 yuan, 250,500 yuan to meet the cost of equipment. The total investment cost of 385,332.48 yuan. The design of the operating costs 1.16 yuan / ton waste.

From the technical, economic indicators, the design is feasible.

Keywords: coking wastewater, NH3+-N, A2/O (anaerobic - anoxic - aerobic) treatment process

1200t/d焦化废水处理工程设计

张汉德

1 前言

1.1焦化废水与焦化废水处理方案

1.1.1焦化废水的特点

焦化废水主要成分有挥发酚、矿物油、氰化物、苯酚及苯系化合物、氨氮等，属于污染物浓度高，污染物成分复杂，难于治理的工业废水之一。

(1)酚含量高

废水中酚含高，有的高达2～12g/L。由于酚的可生化性差，需用萃取法或其它物化法进行预处理加以回收利用。当它的含量高时，还是有很大的回收价值。

（2）氨氮含量高

焦化废水中氨含量高，有时高达2000mg/L。高浓度的氨不仅难以用生化法去除，而且其对生化处理单元有一定的毒害作用，严重时可杀死活性污泥，破坏整个生物处理系统。因此，该高含氨氮废水在进入污水处理站之前，要设蒸氨预处理过程。

经过蒸氨预处理的废水氨氮浓度在100～300mg/L左右，如果要处理到国家一级排放标