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污染控制技术及原理

Biosorption of reactive brilliant blue KN-R using Na-CMC immobilized Aspergillus fumigatus beads

摘要：采用羧甲基纤维素钠(Na-CMC)固定化烟曲霉对活性蒽醌染料活性艳蓝KN-R吸附脱色.通过批式吸附实验探讨了吸附体系的pH值、温度、供氧条件、盐度,固定化小球的粒径、接种量等对吸附脱色效率的影响.结果表明,适合于固定化小球吸附脱色的吸附体系的pH值在弱酸或碱性(4.3～9·0)范围内,不调pH值时(pH=4.3),48h的吸附率为94.5%,pH值为6～9时,48h的吸附率在98%以上;固定化小球的最佳脱色温度为40℃,该温度下24h的吸附率达94.4%;氧充足情况下(摇床转速调节为50r·min^-1)的吸附体系较静止状态能显著提高吸附脱色率;固定化小球脱色过程中能承受一定的盐度,NaCl浓度为0.1%时,吸附脱色效果最好;盐度为2.5%时,48h的吸附率降低至68.4%;粒径为2·0～3.85mm的固定化小球对活性艳蓝KN-R的吸附率相差不大;接种量为3.0%时的吸附脱色效果最好,24h对活性艳蓝KN-R的吸附率达91·0%.在烟曲霉生长期内,固定化小球吸附脱色动力学符合一级动力学方程.

Abstract：Decolorization of media containing anthraquinone dye namely, reactive brilliant blue KN-R, by biosorption using carboxymethylcellulose natrium (Na-CMC) immobilized Aspergillus fumigatus beads was studied. In this batch experiment, the effects of initial pH, temperature, rotation rate, particle size and immobilized beads dosage on biosorption efficiency at 200 mg·L^-1 initial dye concentration were investigated. The range of pHsuited for biosorption was 6 ~ 9, at which the biosorption efficiencies of reactive brilliant blue KN-Rwere more than 98% within 48h. The biosorption efficiency was 94.5 % in 48h at unadjusted pH4.3. The biosorption efficiency was 94.4 % at the optimum temperature 40℃ in 24h. Increasing dissolved oxygen level could enhance the ability of the biosorption. The immobilized beads could endure certain salinity in the process of biosorption. The optimal NaCl concentration was 0.1 %. The biosorption efficiencies using the immobilized beads with beads diameter 2.0 ~ 3.85 mm were close. At optimal immobilized beads dosage (3.0 %), the immobilized beads were able to decolorize media containing reactive brilliant blue KN-Rto an extent of 91.0 % within 24h of growth. The biosorption kinetics of reactive brilliant blue KN-Rusing Na-CMCimmobilized beads fitted in well with first order kinetics model in the mycelia growth phase.