本科毕业论文--混凝吸附及化学氧化法深度处理焦化废水的研究

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1、辽宁科技大学本科生毕业论文第33页混凝吸附及化学氧化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供试对象，采用膨润土、凹凸棒石、次氯酸钙、PAC、PAM作为基本材料，对焦化废水进行深度处理。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0.0132g/L时，COD去除率达到59.2%，脱色率达到90.3%；采用凹凸棒石作为膨润土的改性剂，可以提高焦化废水COD和色度的去除效果。当膨润土与凹凸棒石混合比例为4/1时，与单一添加膨润土相比，COD和色度去除率明显提高；添加无机氧化剂次

2、氯酸钙能进一步提高焦化废水色度及COD的去除率。当次氯酸钙添加量为0.9g/L时，色度、COD去除率分别提高5%、6%左右。通过正交试验确定焦化废水深度处理中去除色度的最佳反应条件为：膨润土+凹凸棒石为4.67g/L，比例为4:1；次氯酸钙1.0g/L;PAC为2.333g/L、PAM为0.02667g/L。优化处理后的焦化废水COD降到63.17mg/L，色度为20度。去除COD的最佳反应条件为：膨润土+凹凸棒石为4.0g/L，比例为4:1；次氯酸钙1.1g/L；PAC为1.6665g/L、PAM为0.00667g/L。优化处理后的焦化废水COD降到58.

3、18mg/L，色度为30度，达到《污水综合排放标准》(GB8978-1996)一级标准。关键词：焦化废水；深度处理；膨润土；凹凸棒石；次氯酸钙辽宁科技大学本科生毕业论文第33页ResearchonAdvancedTreatmentofCokingWastewaterbyCoagulation、AdsorptionandChemicalOxidationAbstractInthispaper,montmorillonite,attapulgiteclay,calciumhypochlorite,polyaluminiumchlorideandPolyacryl

4、amidewereselectedasexperimentalmaterialsfortheadvancedtreatmentofcokingwastewater.Resultswereasfollows:montmorilloniteexhibitedhighadsorptioncapacity;theremovalrateofCODandcolorofcokingwastewaterwere59.2%and90.3%respectivelywhentheadditionquantityofmontmorillonitewas3.3g/L,polyalum

5、iniumchloridewas1.98g/LandPolyacrylamidewas0.0132g/L.ModifiedmontmorillonitebyattapulgiteclaycouldimprovetheremovalofCODandcolorofcokingwastewater.Whentheratioofmontmorilloniteandattapulgiteclaywas4:1,theremovalrateofCODandcolorofcokingwastewatermodifiedbymontmorilloniteincreasedob

6、viouslycomparedwithpuremontmorillonite.additionofinorganicoxidizerCalciumhypochloritecanfurtherimprovethecokingwastewatercolorandCODremoval.Whencalciumhypochloriteadditionlevelwas0.9g/L,thecolorandCODremovalrateincreasedby5%and6%separately.Byorthogonalexperimentwegottheoptimumreact

7、ionconditionstoremovecoloroftheofcokingwastewatertreatment:montmorillonite+Palygorskiteclay4.67g/Lwitharatioof4:1;calciumhypochlorite1.0g/L；PACis2.333g/L,PAMis0.02667g/L.CODofoptimizedandtreatedcokingwastewaterdroppedto63.17mg/L,colordroppedto20degrees.theoptimumconditionsofcolorre

8、movalofare:montmorillonite