Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30172
Investigation of Heavy Metals Uptake by Vegetable Crops from Metal-Contaminated Soil

Authors: Azita Behbahaninia, Seid Ahmad Mirbagheri

Abstract:

The use of sewage sludge and effluents from wastewater treatment plants for irrigation of agricultural lands is on the rise particularly in peri-urban areas of developing countries. The reuse of nutrients and organic matter in treated wastewater and sewage sludge via land application is a desirable goal. However, trace or heavy metals present in sludge pose the risk of human or phytotoxicity from land application. Long-term use of sewage sludge, heavy metals can accumulate to phytotoxic levels and results in reduced plants growth and/or enhanced metal concentrations in plants, which consumed by animals then enter the food chain. In this research, the amount of heavy metals was measured in plants irrigated with wastewater and sludge application. For this purpose, three pilots were made in a Shush treatment plant in south of Tehran. Three plants species, spinach, lettuce and radish were selected and planted in the pilots.First pilot was irrigated just with wastewater of treatment plant and second pilot was irrigated with wastewater and sludge application .Third pilot was irrigated with simulated heavy metals solution equal 50 years of irrigation. The results indicate that the average of amount of heavy metals Pb, Cd in three plant species in first pilot were lower than permissible limits .In second pilot, Cadmium accumulations are high in three species plants and more than the standard limits. Concentration of Cd , Pb have exceed their permitted limits in plants in third pilot . It was concluded that the use of wastewater and sludge application in agricultural lands enriched soils with heavy metals to concentrations that may pose potential environmental and health risks in the long-term.

Keywords: Soil, contaminate, heavy metals, wastewater, sludge, plants.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1079174

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1784

References:


[1] N. Jaafarzadeh, Effect of wastewater of Shiraz city for crops irrigation on heavy metal increase in soil and plants.Proceedings of the second national water and soil congress, Published by agricultural education and development organization, Tehran, Iran, 396, 1996.
[2] K. Naddafi, N. Jaafarzadeh, M. Mokhtari, B. Zakizadeh and M.R. Sakian. Effects of wastewater stabilization pond effluent on agricultural crops. Int. J. Environ. Sci. Tech. , Vol. 1, No. 4, pp. 273-277, Winter 2005.
[3] R.K. Rattan, S.p.Datta, A. K. Singh. Effect of long term application of sewage effluents on available water status in soils under Keshopure Effluent Irrigation Scheme in Delhi, J. Water manage.vol.9 pp.21-26, 2001.
[4] R.L. Bansal, V.k. Nayyar and P.N. Takkar. Accumulation and bioavailability of Zn,Cu, Mn and Fe in soils polluted with industrial waste water, J. Indian Soc.Soil Sci. Vol.40 pp.796-799, 1992.
[5] K.G.Tiller, Essential and toxic heavy metals in soils and their ecological relevance, Trance. XIII Congr. Inter.Soc.Soil Sci.Vol .1, pp 29-44, 1986.
[6] L. Chaney. Crop and food chain effects of toxic elements in sludges and effluents.Proceeding of the joint conferences on Recycling Municipal Sludges and Effluents on Land July, 1973.
[7] R.K. Rattan, S.p. Datta, P.K. Chhonkar, K.Suribabu and A.K.Singh. Long-term of irrigation with sewage effluents on heavy metal content in soils, crops and groundwater. Agriculture, Ecosystem and Environment J. pp.1-21.
[8] AOAC, Official methods of Analysis, Chater 9, pp. 22, 2000.