混凝吸附处理焦化废水

辽宁科技大学毕业设计（论文）第I页混凝吸附方法深度处理焦化废水的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，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，PAC1.98g/L，PAM0.132g/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；脱色辽宁科技大学毕业设计（论文）第II页StudyonAdvancedTreatmentofCokingWastewaterbyCoagulationandAdsorptionAbstractInthispaper,montmorillonite,modifieddicyandiamide,polyaluminiumchlorideandPolyacrylamidewereselectedasexperimentalmaterialsfortheadvancedtreatmentofcokingwastewater，andtheeffectofadditionquantityofmontmorillonite,Ca(OH)2,modifieddicyandiamide,polyaluminiumchlorideandPolyacrylamideontheremovalofCODandcolorweredisscussedtoo.Resultswereasfollows:montmorilloniteexhibitedhighadsorptioncapacity.TheremovalrateofCODandcolorforcokingwastewaterwere59.2%and90.3%respectivelywhentheadditionquantityofmontmorillonitewas3.3g/L,polyaluminiumchloridewas1.98g/LandPolyacrylamidewas0.132g/L.modifieddicyandiamideshowedhighabilityoncolor,buttheremovalofCODwasnotobvious.Theoptimalprocessconditionsbasedonorthogonalexperimentwere:montmorillonite3.96g/L,Ca(HO)20.198g/L,modifieddicyandiamide3.96ml/L,polyaluminiumchloride1.98g/LandPolyacrylamide0.132g/L.TheCODvalueoftreatedcokingwastewaterdecreasedto63mg/Landcolorbelow50underoptimalconditions,whichreachedI-classcriteriaspecifiedin“IntegratedWastewaterDischargeStandard”(GB8978-1996).Keyword:montmorillonite;Modifieddicyandiamide;Cokingwastewater；COD;chromaticity辽宁科技大学毕业设计（论文）第III页1绪论.......................................................................................................11.1引言.............................................................................................................11.2焦化废水的来源及特点.............................................................................21.3焦化废水的处理技术现状.........................................................................31.4焦化废水的深度处理技术.......................................................................41.4.1生物法..................................................................................................41.4.2化学处理法............................................................................................41.4.3物理处理法............................................................................................61.5本研究的的目的及意义...........................................................................72、实验材料及方法..................................................................................72.1实验材料...................................................................................................72.1.1焦化废水.................................................................................................72.2实验原料及仪器.........................................................................................82.2.1实验原料................................................................................................82.2.2实验仪器..............................................................................................102.3水质分析方法............................................................................................102.4实验装置...................................................................................................113.实验结果与分析...................................................................................133.1PAC/PAM对焦化废水色度及COD去除率的影响..............................133.1.1实验过程...............................................................................................133.1.2结果与分析..........................................................................................133.2不同量的膨润土对焦化废水的色度及COD的影响............................143.2.1实验过程............................................................................................143.2.2结果与分析..........................................................................................143.3氢氧化钙添加量对焦化废水的色度及COD的影响............................163.3.1实验过程..............................................................................................163.3.2结果与分析...........................................................................................163.4双氰胺改性絮凝剂对焦化废水的色度及COD的影响......................173.4.1实验过程..............................................................................................173.4.2结果与分析..........................................................................................183.5最佳配比正交试验.................................................................................193.5.1实验过程..............................................................................................203.5.2结果与讨论...........................................................................................213.5.3成本分析..............................................................................................22附图：试验结果对比................................