摘    要我国造纸工艺还比较落后，废水水量较大，水质普遍较差，如何降低造纸废液COD值己成为制约造纸工业发展和水污染治理的瓶颈。本文通过絮凝沉淀的方法，开展聚合氯化铝和新型生物辣木籽絮凝剂对造纸废水COD的降解实验。实验结果表明聚合氯化铝对造纸和制浆两种废水的去除率在质量浓度为1%时取得最佳效果，针对其COD固态和溶解态两者的不同比重，聚合氯化铝适合用于处理COD高的废水，且对固态COD有明显的去除效果，在其最佳浓度下，它的去除率可达92%之高。相对于其对低COD值、高溶解态COD废水的去除效果就显得一般，但去除率也有55%。对于新型辣木絮凝剂，尽管其在处理低COD值、高溶解态COD的废水中也有一定的效果，在浓度为1mg/L时，其去除率达到了67%，略优于PAC处理同类污水的能力，但对高COD值污水的去除效果，则效果不佳。本文还就改良当前造纸废水的处理工艺做了建议。88539

毕业论文关键词：聚合氯化铝、辣木籽絮凝剂、造纸废水、COD值

Abstract Papermaking process is backward relatively in China, and producing a large amount of waste water, also the water quality is generally poor, how to reduce the COD value of paper making wastewater liquid has become a bottleneck restricting the development of paper industry and water pollution control governance。The samples of wastewater froma paper mill treated with composite flocculant of PAC and the flocculant of Moringa Seeds。 The results of the whole experiment has show that the flocculant of PAC has obvious effect to reduce the COD of the paper making wastewater in the mass concentration was 1% , For the different proportion of its solid and dissolved of COD, the PAC is suitable for dealing with high COD wastewater and the high solid of COD。 At its optimum concentration, its high removal rate of 92%。 Relative to wastewater of the low COD value, high removal of dissolved COD, becomes generally, but removal rate of 55%。For the new flocculant of Moringa Seeds ,although it is in the treatment of low COD value, high dissolved COD wastewater also has a certain effect, at a concentration of 1mg / L, the removal rate reached 67%, slightly better than PAC treatment of similar sewage。The ability to remove high COD value of sewage, the effect is poor。This paper also made recommendations on improving the current paper making wastewater treatment process。

Key words: polyaluminum chloride；the flocculant of Moringa Seeds；paper making wastewater；COD

目录

1 前言 1

2 实验材料与方法 3

2。1 实验仪器及材料 3

2。2 分析方法 3

2。3 COD去除实验 3

2。3。1各处理单元排放废水的原始COD值 3

2。3。2 聚合氯化铝对废水COD的去除实验 4

2。3。3 辣木絮凝剂对对废水COD的去除实验 4

2。3。4 混合实验 5

3结果分析 5

3。1各工艺段COD值实验结果 5

3。2 聚合氯化铝对废水COD的去除实验结果 6

3。3辣木絮凝剂对废水COD的去除实验结果 7

3。4混合实验结果 9

3。5 结果综述 9

4 讨论