毕业论文---混凝吸附方法深度处理焦化废水的研究

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1、 混凝吸附方法深度处理混凝吸附方法深度处理焦化废水焦化废水的的研究研究 摘要 本文以焦化废水二级生化出水为研究对象，采用膨润土、改性双氰胺 PAC、 PAM 作为基本材料，对焦化废水进行深度处理。本课题探讨了膨润土的量、氢氧 化钙的量、 双氰胺改性絮凝剂的用量、 PAC 和 PAM 对焦化废水 COD 和色度的影响。 试验结果显示：膨润土具有较高的吸附性能，当膨润土添加量为 3.3g/L、PAC 添加量为 1.98g/L、PAM 添加量为 0.132g/L 时，COD 去除率达到 59.2%，脱色率 达到 90.3%；改性双氰胺絮凝剂对焦化废水的色度有极高的去除作用，脱色率可 达到 91%以上

2、，但对焦化废水的 COD 去除效果不明显。通过正交试验，确定焦化 废水深度处理的最佳反应条件为：膨润土 3.96g/L，氢氧化钙 0.297g/L，改性双 氰胺 3.96ml/L，PAC 1.98g/L，PAM 0.132g/L。经本方法处理后，焦化废水的 COD 从 180mg/L 降到 63mg/L，色度从 250 降低至 50 以下，达到国家污水综合排放 标准 （GB8978-1996 一级标准） 。 关键词：膨润土；改性双氰胺；焦化废水；COD；脱色 Study on Advanced Treatment of Coking Wastewater by Coagulation and

3、Adsorption Abstract In this paper, montmorillonite, modified dicyandiamide, polyaluminium chloride and Polyacrylamide were selected as experimental materials for the advanced treatment of coking wastewater， and the effect of addition quantity of montmorillonite, Ca(OH)2, modified dicyandiamide, poly

4、aluminium chloride and Polyacrylamide on the removal of COD and color were disscussed too. Results were as follows: montmorillonite exhibited high adsorption capacity. The removal rate of COD and color for coking wastewater were 59.2% and 90.3% respectively when the addition quantity of montmorillonite was 3.3g/L, polyaluminium chloride was 1.98g/L and Polyacrylamide was 0.132g/L. modified dicyandiamide showed high ability on color, but the removal of COD was not obvious. The optimal