A review on phytoremediation of heavy metals and utilization of its byproducts.

This review presents the status of phytoremediation technologies with particular emphasis on phytoextraction of soil heavy metal contamination. Unlike organic compounds, metals cannot be degraded, and cleanup usually requires their removal. Most of the conventional remedial technologies are expensive and inhibit the soil fertility; this subsequently causes negative impacts on the ecosystem. Phytoremediation is a cost effective, environmental friendly, aesthetically pleasing approach most suitable for developing countries. Despite this potential, phytoremediation is yet to become a commercially available technology in India. This paper reports about the mobility, bioavaliability and plant response to presence of soil heavy metals. It classifies the plants according to phytoextraction mechanism and discusses the pathway of metal in plants. Various techniques to enhance phytoextraction and utilization of by-products have been elaborated. Since lot of biomass is produced during this process, it needs proper disposal and management. It also gives an insight into the work done by authors, which focuses on high biomass extractor plants. High biomas weeds were selected to restrict the passage of contaminants into the food chain by selecting non-edible, disease resistant and tolerant plants, which can provide renewable energy. Thus making phytoextraction more viable for present utilization. Keywords. heavy metals, phytoextraction, hyperaccumulator, indicator, excluder species

[1]  A. Zayed,et al.  Phytoaccumulation of Trace Elements by Wetland Plants: III. Uptake and Accumulation of Ten Trace Elements by Twelve Plant Species , 1999 .

[2]  N. Basta,et al.  Path analysis of heavy metal adsorption by soil , 1993 .

[3]  A. Tarun,et al.  Cadmium tolerance and accumulation in Indian mustard is enhanced by overexpressing gamma-glutamylcysteine synthetase. , 1999, Plant physiology.

[4]  Todd A. Anderson,et al.  Phytoremediation of soil and water contaminants , 1997 .

[5]  W. E. Rauser.  Structure and function of metal chelators produced by plants , 2007, Cell Biochemistry and Biophysics.

[6]  S. D. Cunningham,et al.  Promises and Prospects of Phytoremediation , 1996, Plant physiology.

[7]  Alan J. M. Baker,et al.  Zinc and Cadmium Uptake by Hyperaccumulator Thlaspi caerulescens Grown in Nutrient Solution , 1995 .

[8]  D. Ow.  Heavy metal tolerance genes: prospective tools for bioremediation , 1996 .

[9]  C. Cobbett.  Phytochelatins and their roles in heavy metal detoxification. , 2000, Plant physiology.

[10]  S. Dushenkov,et al.  Trends in phytoremediation of radionuclides , 2003, Plant and Soil.

[11]  Lieve Helsen,et al.  Low-temperature pyrolysis of CCA-treated wood waste: Chemical determination and statistical analysis of metal input and output; mass balances , 2000 .

[12]  Paul J. Worsfold,et al.  Heavy metals in soils , 1995 .

[13]  Yong Cai,et al.  A fern that hyperaccumulates arsenic , 2001, Nature.

[14]  Koen Oorts,et al.  Phytoextraction of metals from soils: how far from practice? , 2007, Environmental pollution.

[15]  Alan J. M. Baker,et al.  The possibility of in situ heavy metal decontamination of polluted soils using crops of metal-accumulating plants , 1994 .

[16]  Ilya Raskin,et al.  Enhanced Accumulation of Pb in Indian Mustard by Soil-Applied Chelating Agents , 1997 .

[17]  Alan J. M. Baker,et al.  TERRESTRIAL HIGHER PLANTS WHICH HYPERACCUMULATE METALLIC ELEMENTS. A REVIEW OF THEIR DISTRIBUTION, ECOLOGY AND PHYTOCHEMISTRY , 1989 .

[18]  C. Cramers.  Journal of Analytical and Applied Pyrolysis : edited by H.L.C. Meuzelaar and H.-R. Schulten (associate editor C.E.R. Jones), Elsevier, Amsterdam, 1979 (Vol. 1), subscription price Dfl. 145.00, US$ 65.50 per year, ISSN 0165-2370 , 1980 .

[19]  W. E. Rauser.  Structure and function of metal chelators produced by plants: the case for organic acids, amino acids, phytin, and metallothioneins. , 1999, Cell biochemistry and biophysics.

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

[21]  R. Tichý,et al.  Remediation of polluted soil and sediment: perspectives and failures. , 1998 .

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

[23]  C. Martínez,et al.  Solubility of lead, zinc and copper added to mineral soils. , 2000, Environmental pollution.

[24]  I. Raskin,et al.  Phytoremediation of toxic metals : using plants to clean up the environment , 2000 .

[25]  Joan Wong.  Phytoremediation of contaminated soils , 2004 .

[26]  Guillaume Echevarria,et al.  Cadmium Availability to Three Plant Species Varying in Cadmium Accumulation Pattern , 2000 .

[27]  J. Lester,et al.  The impact of heavy metals on lowland rivers and the implications for man and the environment. , 1991, The Science of the total environment.

[28]  W. R. Berti,et al.  Remediation of contaminated soils with green plants: An overview , 1993, In Vitro Cellular & Developmental Biology - Plant.

[29]  Des Connell,et al.  Chemistry and ecotoxicology of pollution , 1984 .

[30]  I. Raskin,et al.  Use of plant roots for phytoremediation and molecular farming. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[31]  Raskin,et al.  Phytoremediation of metals: using plants to remove pollutants from the environment. , 1997, Current opinion in biotechnology.

[32]  M. Kennish.  Ecology of Estuaries: Anthropogenic Effects , 1991 .

[33]  G. F. Vandegrift,et al.  Environmental remediation : removing organic and metal ion pollutants , 1992 .

[34]  R. Swarup,et al.  Environmental Science and Technology , 1998 .

[35]  G. Bañuelos,et al.  Phytoextraction of selenium from soils irrigated with selenium-laden effluent , 2000, Plant and Soil.

[36]  J. Rabier,et al.  Metal accumulating plants: Medium's role , 2003 .

[37]  Scott D. Cunningham,et al.  Phytoremediation of Lead-Contaminated Soils: Role of Synthetic Chelates in Lead Phytoextraction , 1997 .

[38]  M. Farago.  Plants and the chemical elements: biochemistry, uptake, tolerance and toxicity. , 1994 .

[39]  D. Adriano.  Trace Elements in the Terrestrial Environment , 1986 .

[40]  E. Oppelt.  Introduction to Phytoremediation , 2020 .

[41]  D. A. Cataldo,et al.  Soil and plant factors influencing the accumulation of heavy metals by plants. , 1978, Environmental health perspectives.

[42]  A. J. Shaw.  Heavy Metal Tolerance in Plants: Evolutionary Aspects , 1989 .

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

[44]  M. Sadowsky.  Phytoremediation: past promises and future practises , 1999 .

[45]  C Garbisu,et al.  Phytoextraction: a cost-effective plant-based technology for the removal of metals from the environment. , 2001, Bioresource technology.

[46]  C. Denhartog.  Aquatic plants for water treatment and resource recoveryby K.R. Reddy and W.H. Smith (Editors). Magnolia Publishing Inc. Orlando, FL, U.S.A., 1987, xxiv + 1032 pp., ISBN: 0-941463-00-1 , 1989 .

[47]  Raskin,et al.  The role of EDTA in lead transport and accumulation by indian mustard , 1998, Plant physiology.

[48]  G. Bañuelos,et al.  Phytoremediation of Contaminated Soil and Water , 1999 .

[49]  G. N. Richards,et al.  Volatile products of oxidative pyrolysis of wood: Influence of metal ions , 1990 .

[50]  L. Clements,et al.  Pyrolysis as a technique for separating heavy metals from hyperaccumulators. Part I: Preparation of synthetic hyperaccumulator biomass ☆ , 2003 .

[51]  E. Grill,et al.  Phytochelatins, the heavy-metal-binding peptides of plants, are synthesized from glutathione by a specific gamma-glutamylcysteine dipeptidyl transpeptidase (phytochelatin synthase). , 1989, Proceedings of the National Academy of Sciences of the United States of America.

[52]  S. Singh,et al.  A comparative study of cadmium phytoextraction by accumulator and weed species. , 2005, Environmental pollution.

[53]  Scott D. Cunningham,et al.  Phytoremediation of contaminated soils , 1995 .

[54]  Y. C. Wang,et al.  Mechanisms of iron acquisition from siderophores by microorganisms and plants , 1991 .

[55]  S. Singh,et al.  COMPARATIVE UPTAKE AND P HYTOEXTRACTION STUDY OF SOIL INDUCED CHROMIUM BY ACCUMULATOR AND HIGH BIOMASS WEED SPECIES , 2005 .

[56]  A. Bridgwater,et al.  An overview of fast pyrolysis of biomass , 1999 .

[57]  Ichiro Chibata,et al.  Trends in Biotechnology , 1982 .

[58]  M. Tester,et al.  Partitioning of nutrient transport processes in roots. , 2001, Journal of experimental botany.

[59]  M. Sussman,et al.  A role for the AKT1 potassium channel in plant nutrition. , 1998, Science.

[60]  Jeanna R Henry,et al.  An Overview of the Phytoremediation of Lead and Mercury , 2000 .

[61]  P. J. Parsons,et al.  The effects of various platinum metal species on the water plant Eichhornia crassipes (Mart.) Solms. , 1994 .

[62]  H. A. Elliott,et al.  Competitive Adsorption of Heavy Metals by Soils , 1986 .

[63]  K. R. Reddy,et al.  Aquatic plants for water treatment and resource recovery : Proceedings of the Conference on Research and Applications of Aquatic Plants for Water Treatment and Resource Recovery, held July 20-24, 1986, in Orlando, Florida , 1987 .

[64]  A. Schofield,et al.  Land disposal of hazardous waste: Engineering and environmental issues , 1988 .

[65]  I. Raskin,et al.  Bioconcentration of heavy metals by plants , 1994 .

[66]  M. Farago.  Plants and the Chemical Elements , 1994 .

[67]  LAWRENCE P. MILLER,et al.  Plant Growth Regulation , 1959, Nature.

[68]  H. W. Fowler,et al.  Society of Chemical Industry , 1929 .

[69]  R. Reeves.  Tropical hyperaccumulators of metals and their potential for phytoextraction , 2003, Plant and Soil.

[70]  Ilya Raskin,et al.  Phytoextraction: the use of plants to remove heavy metals from soils. , 1995, Environmental science & technology.

[71]  C. Khoo,et al.  PHYTOREMEDIATION–FOCUSING ON ACCUMULATOR PLANTS THAT REMEDIATE METAL CONTAIMINATED SOILS , 1998 .

[72]  F. Agblevor,et al.  Pyrolysis as a technique for separating heavy metals from hyperaccumulators. Part II: Lab-scale pyrolysis of synthetic hyperaccumulator biomass , 2003 .

[73]  R. Leigh,et al.  Where do all the ions go? The cellular basis of differential ion accumulation in leaf cells. , 2000, Trends in plant science.

[74]  D. Ow.  Heavy metal tolerance genes: prospective tools for bioremediation** , 1997 .

[75]  G. N. Richards,et al.  Influence of metal ions and of salts on products from pyrolysis of wood: Applications to thermochemical processing of newsprint and biomass , 1991 .

[76]  D. Bouchez,et al.  Identification and Disruption of a Plant Shaker-like Outward Channel Involved in K+ Release into the Xylem Sap , 1998, Cell.

[77]  W. R. Berti,et al.  Chemistry and Phytotoxicity of Soil Trace Elements from Repeated Sewage Sludge Applications , 1996 .