Nickel biosorption by discharged biomass from wastewater treatment bioreactor: size plays a key role

作者：Zhou, Dandan^*; Yang, Yang; Li, Yunbao; Xu, Zhengxue; Dong, Shanshan

来源：Applied Microbiology and Biotechnology, 2015, 99(6): 2829-2838.

DOI：10.1007/s00253-014-6149-x

• Biomass
• Aerobic granules
• Size
• Nickel
• Biosorption

Biomass size significantly affects the characteristics of the extracellular polymeric substances, which in turn influences the biosorption mechanisms. In this work, nickel biosorption mechanisms and the capacity of excess aerobic granules (AGs) of > 850 mu m, 500-850 mu m, 212-500 mu m, and bioflocs < 212 mu m, discharged during wastewater treatment operation, were investigated by elemental composition and spectroscopic analysis. Ni2+ biosorption capacity decreased apparently from 1.28-1.53 to 0.93 mEq/g with the increase of biomass size from 0-850 to > 850 mu m due to their different biosorption mechanisms. Chemical binding between nickel and protein was dominant for biomass less than 850 mu m, whereas nickel adsorption was mainly physical when biogranule size was greater than 850 mu m, because the nickel had no opportunity to interact with protein located in the core of the biogranule. Only low levels of ion exchange (< 15.22 %) and precipitation (negligible) were observed for all kinds of biomass. Thus, biomass greater and less than 850 mu m presented quite different biosorption mechanisms.

• 出版日期2015-3
• 单位吉林大学