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|Title:||A novel approach to exploit indigenous mining algal-microbes in a photo-rotating biological contactor for heavy metal removal from acid mine drainage|
|Citation:||Proceedings of the International Mine Water Association Symposium: Mine Water and the Environment, held in Bunbury, Western Australia, 29 September-4 October, 2012 / C.D. McCullough, M.A. Lund and L. Wyse (eds.): pp. 231-236|
|Conference Name:||International Mine Water Association Symposium (2012 : Bunbury, WA)|
|Sanaz Orandi, David M. Lewis, Afsar Eslami and Ali Mohebbi|
|Abstract:||Extremophilic acidic microbial biofilms, that thrive in acidic mine drainages (AMD), are well known as natural metal-resistant biosorbents for removing heavy metals throught active and passive cellular functions. To benefit from the resistant and cleansing nature of these microorganisms and to develop a system applicable to mining sites, an indigenous AMD biofilm was immobilized in a laboratory scale photo-rotating biological contactor (PRBC) to investigate its heavy metal removal potential from AMD. The microbial consortium used for biofilm development contained filamentous green micro-algae, bacteria, fungi and yeasts, collected from AMD and the Sarcheshmeh copper mine in Iran. The PRBC was operated with synthesised AMD representing the multi-ion and acidic composition of the wastewater (composing 18 elements with a pH of 3.5+0.3) from which the microbial consortium was collected. Light, nutrient dosing and rotational speeds were optimised to encourage biofilm development. Electron microscopy was used to monitor the development of the algal-microbial biofilm on the PROBC discs over a 60 day batch mode operation. The PRBC was then run continuously with a 24 h hydraulic residence time (HRT) over a ten week period. The weekly average of water analysis results demonstrated the ability for the algal-microbial biofilm to remove 15-50% of various metals in the order of Cu> Ni> Mn> Zn> Sb> Cr> Co> Al. These results clearly indicate the significant potential for indigenous AMD biofilm to be exploited within a PRBC for AMD treatment.|
|Keywords:||Acid mine drainage; micro-algae; biofilm; photo-rotating biological contractor; biotreatment|
|Rights:||Copyright © 2012 IMWA - International Mine Water Association. All Rights Reserved.|
|Appears in Collections:||Chemical Engineering publications|
Environment Institute publications
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