微砂强化磷酸-蔗糖钙法的絮凝沉降工艺研究
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摘要
利用水处理中微砂强化絮凝技术以及异相成核原理研究了微砂对磷酸-蔗糖钙工艺的强化作用。考察了微砂与絮凝剂不同投加方式对糖浆絮凝沉降速度的影响,确定了微砂的最佳投加方式,并对絮体形成过程进行初步探讨。在此基础上以沉降时间为指标,考察不同粒径的微砂、微砂投加量以及聚丙烯酰胺用量等因素对糖汁絮凝沉降过程的影响,并通过单因素分析以及三因素三水平对糖汁絮凝沉降进行Box-Behnken响应面试验。结果表明,与磷酸-蔗糖钙法相比,微砂强化可使絮凝沉降过程中形成的絮体更大、更密实,沉降性能更好;微砂强化磷酸-蔗糖钙法最佳的工艺条件为:微砂粒径为80～100μm、微砂投加量为0. 4 g、聚丙烯酰胺质量分数为5 mg/kg、沉降时间为4. 5 min。
Based on the micro-sand enhanced flocculation technology and the heterogeneous nucleation principle in water treatment,the enhancement effect of micro-sand on the flocculation sedimentation of the phosphoric acid-sucrose calcium process is studied.The effect of the adding forms of micro-sand and flocculant on the flocculating sedimentation rate of the syrup is investigated and the optimum adding form for micro sand is determined.The formation process of the floc is preliminarily explored.On this basis,the influences of micro-sand particle size,micro-sand dosage and the adding amount of polyacrylamide on the flocculation and sedimentation process of sugar juice are investigated,and the BoxBehnken response surface tests are carried out to the flocculation and settlement of sugar juice through single factor analysis,and three factors and three levels. The results disclose that micro-sand enhancement can make the flocculation sedimentation process form larger,denser and better flocs.The optimum technological conditions for micro-sand enhanced phosphate-sucrose calcium method are as follows: the size of micro-sand is 80-100 μm,the dosage of micro-sand is 0. 4 g,the dosage of polyacrylamide is 5 mg per kg and the sedimentation spends 4. 5 min.
Based on the micro-sand enhanced flocculation technology and the heterogeneous nucleation principle in water treatment,the enhancement effect of micro-sand on the flocculation sedimentation of the phosphoric acid-sucrose calcium process is studied.The effect of the adding forms of micro-sand and flocculant on the flocculating sedimentation rate of the syrup is investigated and the optimum adding form for micro sand is determined.The formation process of the floc is preliminarily explored.On this basis,the influences of micro-sand particle size,micro-sand dosage and the adding amount of polyacrylamide on the flocculation and sedimentation process of sugar juice are investigated,and the BoxBehnken response surface tests are carried out to the flocculation and settlement of sugar juice through single factor analysis,and three factors and three levels. The results disclose that micro-sand enhancement can make the flocculation sedimentation process form larger,denser and better flocs.The optimum technological conditions for micro-sand enhanced phosphate-sucrose calcium method are as follows: the size of micro-sand is 80-100 μm,the dosage of micro-sand is 0. 4 g,the dosage of polyacrylamide is 5 mg per kg and the sedimentation spends 4. 5 min.
引文
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[4]Jiang C,Wang R,Ma W. The effect of magnetic nanoparticles on Microcystis aeruginosa,removal by a composite coagulant[J].Colloids&Surfaces A Physicochemical&Engineering Aspects,2010,369(1-3):260-267.
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[9]Li H,Liu S,Zhao J,et al.Removal of reactive dyes from wastewater assisted with kaolin clay by magnesium hydroxide coagulation process[J].Colloids&Surfaces A Physicochemical&Engineering Aspects,2016,494:222-227.
[10]田宗义.原糖澄清脱色新工艺的研究[D].南宁:广西大学,2014.
[11]李莉,张赛,何强,胡学斌.响应面法在试验设计与优化中的应用[J].实验室研究与探索,2015,34(8):41-45.
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