BEPLS Vol 3 [6] 2014 219 | P age ©2014 AELS, INDIA Bulletin of Environment, Pharmacology and Life Sciences Bull. Env. Pharmacol. Life Sci., Vol 3 [6] May 2014: 219-222 ©2014 Academy for Environment and Life Sciences, India Online ISSN 2277-1808 Journal’s URL:http://www.bepls.com CODEN: BEPLAD Global Impact Factor 0.533 Universal Impact Factor 0.9804 ORIGINAL ARTICLE Kinetic Equations for Aquatic Plants' Lead Absorption from Industrial Sewage Sludge in Khuzestan Shahram Goudarzi 1 , Mehran Hoodaji², Mahmoud Kalbasi², Payam Najafi³ 1 Department of Soil Sciences, Khorasgan(Isfahan) Branch, Islamic Azad University, Khorasgan, Iran 2 Department of Soil Sciences, Khorasgan(Isfahan) Branch, Islamic Azad University, Khorasgan, Iran 3 Department of Water Engineering, Khorasgan(Isfahan) Branch, Islamic Azad University, Khorasgan, Iran ABSTRACT Aquatic plants can absorb nutrients and heavy metals from soil and sewage sludge. In this study, the capability of three aquatic plant species, Typha latifolia ،Phragmites australis, has been investigated in respect of lead absorption from sewage sludge in a hot and dry climate of Dezful. Each of the two plant species was cultured in systems; also some systems, without planet, were considered as a control, and it was conducted in a completely randomized design and the lead uptake of plant species in these treatments has been studied. The test included 6 pounds of sewage sludge, and 3 ponds without plant as a control group. The results showed that the lead accumulation in underground organs of both plant species was higher than shoots. Lead accumulation in the tissues of plant species of T. latifolia was more than that in the tissues of other species. At the end, Kinetics equations of absorption were extracted by Curve expert, 2007. The general form of absorption equations was fitted to exponential equation, these absorption equations are: y = ae b/t and y = (1-e -bt ). In these equations, Y is the rate of heavy metal accumulation, t is time, a and b coefficients are regression coefficients. The results represent the superiority of T. latifolia over the other plant species under study. Key words: Lead, Typha latifolia, Phragmites australis, sewage sludge Received 12.01.2014 Revised 25.03.2014 Accepted 12.04. 2014 INTRODUCTION The use of sewage sludge has always been considered by researchers and experts in agriculture and environmental section as a providing source of cheap nutrients in farmlands. By considering the increasing population growth and thus increasing sewage, and consequently increasing the sewage sludge, the agricultural use is one of the suitable and environmentally sound ways to prevent its accumulation. However, due to the high concentration of heavy metals in the sewage sludge combination, its direct consumption will cause some problems. Accumulation of heavy metals such as nickel, cadmium, lead and other toxic substances in the soil by using sewage sludge will cause their entrance into the food chain through the plant uptake and make toxicity. Artificial canebrake systems are those that have been used in many parts of the world with low cost and simple technology to refine different types of sewage. In these systems, the heavy metals existing in the sewage are removed by absorbing through aquatic plants, chemical combination, ion exchange, adsorption by soil, and other inorganic materials [2]. The results of a survey conducted by Vymazal [1] in Czech Republic, to determine the removal efficiency of heavy metals from an industrial sewage with artificial horizontal pond systems showed that this system could refine a lot of heavy metals such as copper (Cu), Chromium (Cr). P. australis and Phalaris arundinacea were plants examined in this study. The sampling of plant organs shows that the most decrease in Cu and Cr concentration has been respectively in plants’ roots, rhizomes, stems and leaves. Manios et al [3] studied the effect of input concentration of heavy metals existing in sewage sludge on the uptake of these metals through aerial and underground organs of aquatic plant specie, T. latifolia. Heavy metals investigated in this study were Cadmium, Copper, Zinc, Nickel and Lead; the culture mediums were irrigated with water contaminated with above mentioned metals once every two weeks, and after 10 weeks sampling of plants’ organs was done. The result showed that this plant specie has a high ability in absorbing metal; and the accumulation of these metals in aerial organs was higher than the underground organs. Therefore, the study of effective and environmental friendly methods for heavy