Publisher: Chemical Society of Nigeria

Detoxification of Hg (II), As (III) and Pb (II) Ions From Waste Water By Biosorption With Coconut Fiber

J. C. Igwe, S. I. Okenwa, A. A. Abia
KEYWORDS: Detoxification, wastewater, Biosorption, Heavy metals, pH, Temperature.

ABSTRACT:

The  pollution  of  the  environment  with  toxic  metals  is  a  result  of  human  activities  such  as  mining  and  metallurgy. The  effects  of  these  metals  on  the  ecosystems  are  of  large  economic  and  public  health  significance. Bioremediation  consists  of  a  group  of  applications,  which  involve  the  detoxification  of  hazardous  substances instead  of  transferring  them  from  one  medium  to  another  by  means  of  microbes  and  plants.  The  pH,  temperature and  particle  size  effects  on  the  detoxification  of  Hg2+,  As3+  and  Pb2+  metal  ions  using  modified  and  unmodified coconut  fiber  was  studied  in  this  paper.  pH  significantly  affected  the  adsorption  with  maximum  amount adsorbed  at  pH  of  10-12.  Adsorption  increased,  as  temperature  increased  until  at  about  40  oC.  The  bigger particle  size  of  600μm  showed  greater  adsorption.  Modification  also  increased  the  absorption  capacity.  These results  will  serve  as  parameters  for  design  of  treatment  plants  for  heavy  metal  detoxification  using  agricultural by-  products  such  as  coconut  fibre.


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