A biomaterial based approach for arsenic removal from water.

We demonstrate that the non-living, dried roots of the water hyacinth plant [Eichhornia crassipes(Mart.) Solms] can rapidly remove arsenic from water. Atomic absorption spectrometry was used to demonstrate that more than 93% of arsenite (As(iii)) and 95% of arsenate (As(v)) were removed from a solution containing 200 microg As l(-1) within 60 minutes of exposure to a powder produced from dried roots. No difference in removal efficiency was observed between the two oxidation states of As studied. The amount of arsenic remaining in solution was found to be less than 10 microg l(-1) which is the WHO guideline limit value for As in drinking water. The presence of arsenic in drinking water in a number of countries in the developing world has been found to be much higher than the WHO level, affecting the health of millions of people. In this paper, we show that a biomaterial produced from dried water hyacinth roots, a plant that is found in abundant supply in many parts of the world, can provide a simple, effective and yet cheap method for removing arsenic from contaminated water.

[1]  Ilya Raskin,et al.  Rhizofiltration: the use of plants to remove heavy metals from aqueous streams. , 1995, Environmental science & technology.

[2]  A. Zayed,et al.  PHYTOACCUMULATION OF TRACE ELEMENTS BY WETLAND PLANTS: II. WATER HYACINTH , 1999 .

[3]  I. Raskin,et al.  Metal Accumulation by Aquacultured Seedlings of Indian Mustard , 1997 .

[4]  Thomas J. Sorg,et al.  Water treatment processes. III. Removing dissolved inorganic contaminants from water , 1986 .

[5]  H. Yokota,et al.  Arsenic pollution of groundwater in Bangladesh , 2001 .

[6]  Randall E. Mielke,et al.  Adsorption of Eu(III) onto Roots of Water Hyacinth , 1999 .

[7]  Alan J. M. Baker,et al.  Phytoremediation Potential of Thlaspi caerulescens and Bladder Campion for Zinc‐ and Cadmium‐Contaminated Soil , 1994 .

[8]  A. Khan,et al.  Appraisal of a simple arsenic removal method for ground water of Bangladesh , 2000 .

[9]  Kun She Low,et al.  BIOSORPTION OF COPPER BY WATER HYACINTH ROOTS , 1994 .

[10]  M. Soltan,et al.  LABORATORY STUDY ON THE SURVIVAL OF WATER HYACINTH UNDER SEVERAL CONDITIONS OF HEAVY METAL CONCENTRATIONS , 2003 .

[11]  G. Bennett.  Arsenic in the environment — Part II: Human health and ecosystem effects , 1996 .

[12]  Arabinda Das,et al.  Removal of arsenic from drinking water using modified fly-ash bed , 2000 .

[13]  P. Haris,et al.  A survey of arsenic in foodstuffs on sale in the United Kingdom and imported from Bangladesh. , 2005, The Science of the total environment.

[14]  Ilya Raskin,et al.  Phytoremediation: A Novel Strategy for the Removal of Toxic Metals from the Environment Using Plants , 1995, Bio/Technology.

[15]  Yanyan Hao,et al.  Uptake of metal ions by nonliving biomass derived from sphagnum moss and water hyacinth roots , 1993 .

[16]  R. H. Loeppert,et al.  Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes , 1998 .

[17]  M. Misbahuddin,et al.  Water Hyacinth Removes Arsenic from Arsenic-Contaminated Drinking Water , 2002, Archives of environmental health.

[18]  W. H. Ficklin.  Separation of arsenic(III) and arsenic(V) in ground waters by ion-exchange. , 1983, Talanta.

[19]  R. Saxena,et al.  Comparative Studies on Accumulation of Cr from Metal Solution and Tannery Effluent under Repeated Metal Exposure by Aquatic Plants: Its Toxic Effects , 2002, Environmental monitoring and assessment.

[20]  A. Zouboulis,et al.  Application of biological processes for the removal of arsenic from groundwaters. , 2004, Water research.

[21]  A. M. A. Mazen,et al.  Accumulation of cadmium, lead and strontium, and a role of calcium oxalate in water hyacinth tolerance , 1997, Biologia Plantarum.

[22]  F. L. Shore,et al.  Uptake of arsenic, cadmium, lead and mercury from polluted waters by the water hyacinth Eichornia crassipes , 1982 .

[23]  R. Wennrich,et al.  Application of natural zeolites for preconcentration of arsenic species in water samples. , 2001, Journal of environmental monitoring : JEM.

[24]  E. R. Hayes,et al.  Removal of arsenic from contaminated drinking water by a chitosan/chitin mixture , 1980 .