污染控制技术及原理
罗隽,胡勇有,仲海涛.烟束曲霉菌丝球对Cr(Ⅵ)的去除—还原与吸附作用[J].环境科学学报,2007,27(10):1585-1592
烟束曲霉菌丝球对Cr(Ⅵ)的去除—还原与吸附作用
- Removal of Cr(Ⅵ) in solution by Aspergillus fumisynnematus mycelia:reduction and biosorption
- 基金项目：广州市环境保护局资助项目(穗计[006])
- 作者
- 单位
- 罗隽
- 华南理工大学环境科学与工程学院 广州 510642
- 胡勇有
- 华南理工大学环境科学与工程学院 广州 510642
- 仲海涛
- 华南农业大学资源与环境学院 广州 510640
- 摘要：采用投加烟束曲霉(Aspergillusfumisynnematus)菌丝球的方法去除含铬废水中的Cr(VI),通过研究模拟含铬废水中Cr(VI)与总Cr浓度及pH值的变化规律来确定烟束曲霉菌丝球对Cr(VI)的去除作用.结果表明,烟束曲霉菌丝球对Cr(VI)的去除作用包括还原与吸附,以还原作用为主,兼有一定程度的吸附.适宜条件(30℃,150r.min-1,pH=1.30,投加量10.0g)下菌丝球能在48h内将100mL浓度为10～200mg·L-1Cr(VI)溶液中的Cr(VI)全部去除,其中对总Cr的吸附率为30%～50%,对Cr(VI)的还原率则达到了99%以上,吸附平衡后解吸出来的Cr的形态95%以上为Cr(III).考察了溶液初始pH值、Cr(VI)初始浓度、菌丝球投加量及温度对菌丝球去除Cr(VI)作用的影响.结果表明,菌丝球只有在低pH值时才能达到对Cr(VI)较好的去除效果.溶液初始pH值及Cr(VI)初始浓度的降低、菌丝球投加量及温度的升高均能提高菌丝球对Cr(VI)的去除率,溶液初始pH值的降低及菌丝球投加量的增加均可提高菌丝球对总Cr的吸附率,温度则主要通过改变菌丝球的结构形态来影响菌丝球对总Cr的吸附作用.菌丝球对Cr(VI)及Cr(III)均存在吸附作用,吸附在菌丝球上的Cr(VI)在酸性环境下易被还原成Cr(III).
- Abstract：The live fungus, Aspergillus fumisynnematus, is capable of reducing Cr(VI) to Cr(III),adsorbing Cr onto its surface,and thus removing Cr(VI) from solution.The concentration of Cr(VI) and total Cr,and pHwere determined to investigate the removal of Cr(VI) by the live mycelia from an artificial Cr(VI)-containing solution.The results indicate that the live mycelia could remove Cr(VI) within 48 h from a solution with initial Cr(VI) concentration from 10 to 200 mg·L-1.The adsorption rate of Cr was 30%～50%,while the removal rate could reach 95%.Desorption experiments indicated that mainly Cr(III) was bound to the surface of the mycelia.The influence of pH,Cr(VI) concentration,biomass concentration and temperature on Cr(VI) removal were also evaluated.The pHwas the most significant impact factor and a higher removal rate depended on a lower pH.The Cr removal rate increased with a decrease in pHand Cr(VI) concentration,and with an increase in biomass concentration and temperature.In general,the adsorption rate increased with an increase in biomass concentration and a decrease in pH,and temperature affected the adsorption rate by affecting the structural conformation of the mycelia.Cr(VI) and Cr(III) were adsorbed by the mycelia at the same time.When adsorbed on the mycelia surface,the Cr(VI) was converted to Cr(III) in a short time in an acid environment(pH1.5).
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