宏
重金属
微观层面
环境科学
环境化学
生态学
化学
生物
工程类
计算机科学
土木工程
经济影响分析
程序设计语言
作者
Loredana Brinza,Matthew J. Dring,Maria Gavrilescu
出处
期刊:Environmental Engineering and Management Journal
[OAIMDD - EcoZone Publishing House]
日期:2007-01-01
卷期号:6 (3): 237-251
被引量:153
标识
DOI:10.30638/eemj.2007.029
摘要
This paper reviews some practical aspects of the application of algal biomass for the biosorption of heavy metals from wastewater.The ability of different algal species to remove metals varies with algal group and morphology, with the speciation of specific metals and their competition with others in wastewater, and with environmental or process factors.The scattered literature on the uptake of heavy metals by both living and dead algal biomass -both macroalgae and immobilized microalgae -has been reviewed, and the uptake capacity and efficiency of different species, as well as what is known about the mechanisms of biosorption, are presented.Data on metal uptake have commonly been fitted to equilibrium models, such as the Langmuir and Freundlich isotherm models, and the parameters of these models permit the uptake capacity of different algal species under different process conditions to be compared.Higher uptake capacities have been found for brown algae than for red and green algae.Kelps and fucoids are the most important groups of algae used for biosorption of heavy metals, probably because of their abundant cell wall polysacchrides and extracellular polymers.Another important practical aspect is the possibility of re-using algal biomass in several adsorption/desorption cycles (up to 10 have been used with Sargassum spp), and the influence of morphology and environmental conditions on the re-usability of algal tissue is also considered.
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