摘要
利用聚乙烯醇-海藻酸钠-活性炭粉末制作固定化烟曲霉小球,并以其为吸附介质,在30℃、120 r/min的培养条件下,考察了不同初始pH值、葡萄糖质量浓度、NaCl质量浓度和Cr(Ⅵ)质量浓度时固定化烟曲霉小球对模拟废水中Cr(Ⅵ)的吸附效果。结果表明,固定化烟曲霉小球在中性偏酸环境中对Cr(Ⅵ)有更好的吸附效果,且吸附效率随葡萄糖初始添加量的增加呈增大趋势;NaCl在初始添加量较低时对Cr(Ⅵ)吸附效果影响不大,质量浓度较高时,则会对Cr(Ⅵ)的吸附效果产生显著影响;固定化烟曲霉小球对Cr(Ⅵ)的吸附效率随Cr(Ⅵ)质量浓度的增加呈递减趋势,而吸附量随Cr(Ⅵ)质量浓度的增加呈递增趋势。
The present paper is concerned about our research on the effects of a single factor on removing Cr（ Ⅵ ） by complex-prep immo- bilized Aspergillus fumigate beads. As is known, the AspergiUus fumigates can be immobilized into the beads shaped by polyvinyl alco- hol, sodium alginate and powdered activated carbon. In this paper, we have studied the strength and stability of the immobilized Aspergillus fumigates beads through the mechanical agitation. More specifically, we have done investigations over the following aspects. （1） At the temperature of 30 ℃ and 120 r/min, the immobilized As- pergillus fumigates beads remain reactant; （2） We have examined how the initial different pH values, the glucose （C6H1206） concen- tration, the sodium chloride （NaCl） concentration and chromium （Cr（ Ⅵ） ） concentration affect the removal effciency of Cr（ Ⅵ ） in mierospheres in simulated sewage ; （ 3 ） The immobilized Aspergillus fumigates beads are highly strong and stable whereas the mierospheres have different removal Cr（ Ⅵ） effciencies in different conditions. In experimental research scope, the removal Cr （ Ⅵ） efficiency of the immobilized beads prove to be higher in the meta-acid condition than in other pH values. When the glucose concentration keeps between 0 g/L to 12 g/L, it can be found that its effect on the removal Cr（ Ⅵ ） efficiency tends to increase with the increase of glucose （C6H1206） concentration, that is to say, the higher glucose concentration, the more nutritious the Aspergillus fumigates would be. （4） When the sodium chloride concentration is in the range of 0 - 10 g/L, the ef- fect of sodium chloride on removal Cr（ Ⅵ ） efficiency is little at the low initial sodium chloride （NaCl） concentration（ lower than 2 g/L）, but it would be strong at the high initial sodium chloride concentra- tion, when initial sodium chloride concentration increased from 2 g/L to 5 g/L, the removal Cr（ Ⅵ） efficiency would decrease from 90.9% to 81.8%, with the removal Cr（ Ⅵ ） efficiency decreased quickly. Thus, the removal Cr（ Ⅵ） efficiency of the immobilized AspergiUus fumigates beads can be said to decrease with the increase of the intial Cr（ Ⅵ） concentration, but increased with the increase of the intial Cr（ Ⅵ ） concentration. Thus, it can be found that in our experimental research scope, the optimum environment conditions for immobilized Aspergillus fumigates beads removal Cr（ Ⅵ ） from simulated sewage prove to be pH value was 5, glucose concentration was 12 g/L, sodium chloride concentration was 0 g/L. At optimal conditions, the immobilized aspergillus fumigates beads could be effectively removal Cr（ Ⅵ ） from simulated sewage within the 10 days. When chromium concentration is 20.2 mg/L, the removal Cr （ Ⅵ ） efficiency of the immobilized Aspergillus fumigates beads can be made as high up as 93.7%.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2011年第5期57-61,共5页
Journal of Safety and Environment
关键词
环境工程学
烟曲霉
固定化
吸附
Cr(Ⅵ)
environmental engineering
Aspergillus fumigates
im-mobilization
biosorption
chromium（ Ⅵ ） [Cr（ Ⅵ ） ]
作者简介
作者简介：章淼，硕士研究生，从事水污染控制研究；
朱静平（通信作者），教授，从事废水处理理论与工程技术及水处理微生物技术研究，zjp．gd@126．com。
