新生态MnO_2强化混凝去除苯酚的影响因素研究

Effects on Phenol Removal in the Process of Enhanced Coagulation by Manganese Dioxide Formed in situ

以苯酚为目标物,考察钙离子、单宁酸、高岭土投量、新生态二氧化锰投量、pH等条件对新生态二氧化锰强化氯化铝混凝去除苯酚的影响.结果表明,钙离子能够促进新生态二氧化锰强化混凝对苯酚的去除,在钙离子投加范围内(0～1.0mmol.L-1),苯酚的去除率能提高10%左右;单宁酸与苯酚共存时,能显著促进苯酚的去除,当单宁酸投加10 mg.L-1,氯化铝单独混凝过程,苯酚的去除率能提高30%左右,新生态二氧化锰强化氯化铝混凝过程,苯酚的去除率能提高50%以上.1mg.L-1新生态二氧化锰与30 mg.L-1氯化铝进行混凝,苯酚的去除率与单独投加50 mg.L-1氯化铝的混凝去除效果相当.pH为5～9的范围内,新生态二氧化锰强化混凝对苯酚的去除效果好,而在强酸性及强碱性条件苯酚的去除率低.

Phenol was selected as a model compound.Factors,such as Ca2＋,tannic acid,dose of kaolinite,dose of manganese dioxide formed in situ and pH,were invested on phenol removal in the process of enhanced coagulation by manganese dioxide formed in situ.Results showed that the addition of Ca2＋ is beneficial for phenol removal.In the range of Ca2＋ varied from 0 to 1.0 mmol·L-1,the efficiency of phenol removal was enhanced more than 10%.Tannic acid can enhance phenol removal significantly when they are coexisted in water.As tannic acid was added to 10 mg·L-1,phenol removal can be increased about 30% and 50% in the process of coagulation by AlCl3 and enhanced coagulation by manganese dioxide formed in situ,respectively.The dose of coagulant can be reduced in the process of enhanced coagulation with the addition of manganese dioxide formed in situ.The point of 1 mg·L-1 manganese dioxide formed in situ linked with 30 mg·L-1 AlCl3 can have the same phenol removal efficiency as the addition of 50 mg·L-1 AlCl3.In the range of pH varied from 5 to 9,phenol can be removed with the high efficiency in the process of enhanced coagulation by manganese dioxide formed in situ.While under the strong acid condition and strong basic condition,phenol has lower removal efficiency.