成都理工大学工程技术学院毕业论文

某焦化废水治理工艺设计

作者姓名：XXX

专业名称：环境工程

指导教师：XXX 讲师

某焦化废水治理工艺设计

摘 要

焦化废水中含有大量的氨氮以及多种有毒的有机化合物，如多环芳烃等成分复杂的化合物。从组成成分上讲，焦化废水必然会造成环境废染、影响人体健康。处理焦化废水的方法有许多，生物法以其在经济上可行性较好的特点而得到广泛应用。 本文为某焦化废水处理工艺设计，规模为300立方米/日。废水处理流程为：进厂废水从泵房到隔油池，然后流入气浮池，气浮池出水进入调节池，调节池出水进入A/O反应池，再进入二次沉淀池，二次沉淀池出水进入混凝沉淀池，最后出水。污泥处理的流程为：从二沉池以及混凝沉淀池排出的剩余污泥进入污泥浓缩池，再进入污泥脱水间，最后外运处置。

废水处理后的出水优于国家《综合废水排放标准》(GB8978-1996)一级标准。

选择A/O工艺处理焦化废水，在脱氮方面的效率要明显高于SBR法以及CASS氧化沟等方法。

关键词：A/O工艺；焦化废水；脱氮

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某焦化废水治理工艺设计

Abstract

Coke-plant wastewater generated from coal-cooking processes contains high levels of NH3-N. Apart from NH3-N coke-plsnt wastewater contains various groups of toxic organic compounds such as polynuclear aromatic hydrocarbons (PAHs) and heterocyclic compounds. From a compositional point of view, colk-plant wastewater therefore presents adverse environmental and helth effects.

Several methods (physic-chemical and biological methods) have been employed in the removal of NH3-N and COD from coke-plant wastewater. The biological methods are most often employed because of their economica advantages over physical-chemical methods. This article is a design of one project for the treatment of coke-plant wastewater.

The construction of this project is 300 m3 per day.The process is that:the wastwater runs from pump house to grease trap,enters the flotation tank, enters regulation pool, then enters A/O reactor tank, enters the secondary sedimentation tank, then enters the coagulation and sedimentation tank, at last lets out. The process of the sludge is that: the surplus sludge from the sedimentation tank enters sludge thickener, then enters dehydration house, then it is dehydrated, at last it is carried out of the plant.

The outlet water of the plant meets the level one of the National Discharge Standard of Steel industry standards for water pollutants (GB8978-1996).

Selecting the Anoxic-Oxic system for the treatment of coke-plant wastewater is more efficient than the craft of SBR and the craft of CASS etc. It can take large quantity of the nitrogen from coke-plant wastewater.

Key words：The Anoxic-Oxic; Coke plant wastewater; Taking off the nitrogen

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某焦化废水治理工艺设计

目录

摘 要 ................................................. I ABSTRACT .............................................. I 目录 ................................................. II 前言 .................................................. 1 1 焦化废水概述 ........................................ 2 1.1 焦化废水概况 ................................... 2

1.1.1 焦化废水来源与组成 ......................... 2 1.1.2 焦化废水的特点及危害 ....................... 4 1.2 国内外焦化废水处理技术 ......................... 5 1.2.1 物理化学法 ................................. 6 1.2.2 生化处理法 ................................. 6 1.2.3 化学处理法 ................................. 7 2 水质分析和处理工艺选择 .............................. 9 2.1 建厂当地自然条件 ................................ 9 2.1.1来源组成 ..................................... 9 2.1.2水质特征 .................................... 10 2.1.3 排放量 ..................................... 10 2.2 排放标准 ....................................... 11 2.3.1 焦化废水水质 ................................. 11 2.4 处理工艺的选择 ................................ 11 2.4.1 处理工艺流程选择应考虑的因素 .............. 11 2.4.2 工艺对比 .................................. 12 2.4.3 工艺选择 .................................. 15 2.4.4 A/O工艺原理 ............................... 15 2.5 各段工艺去除率 ................................ 16 3 主体构筑物设计 .................................... 18 3.1 格栅 ........................................... 18 3.2 集水池 ......................................... 20 3.3 隔油池 ........................................ 21 3.4 调节池 ........................................ 22 3.5 事故池 ........................................ 23

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