University of Khartoum

Effect of Treated waste water from Oil Refinery on Elemental load in Soil, Fruit and Tree, El Obied North Kordofan State, Sudan

Effect of Treated waste water from Oil Refinery on Elemental load in Soil, Fruit and Tree, El Obied North Kordofan State, Sudan

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Title: Effect of Treated waste water from Oil Refinery on Elemental load in Soil, Fruit and Tree, El Obied North Kordofan State, Sudan
Author: Mustafa, Hytham Elshazli Edris
Abstract: This study was carried out to assess the effects of irrigation with treated waste water from El Obeid oil Refinery Company (10 km north El Obeid City, North Kordofan State) on accumulation of elements in the soil and plant parts of Citrus aurantifolia, Moringa oleifera and Psidium guajava. Two methods of waste water treatments (lagoon and sand basin filter) were compared with fresh water. Three replications of soil samples (0-30 and 30-60 cm) were collected from under the canopy of each tree irrigated with either fresh water or treated waste water. A control soil sample was also collected from a distal area located at about 3.5 km from the refinery site. Similarly, three plant samples (leaves, roots and fruits) from ea ch tree were also collected. Fresh and treated waste water, soil, water and plant samples were analyzed for pH, electrical conductivity and elements (Ag, Al, As, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Sb, Se, Si, Sr,Ti, V, and Zn) using Inductive Couple Plasma Optical Emission Spectrometry (ICP- OES 725). The differences between irrigation with treated waste water and fresh water were statistically determined using the analysis of variance. Elements load in treated waste water was not significantly different from fresh water and lower than the permissible limits prescribed by World Health Organization. However, content of Ca, K, Mg, Naand Si was significantly (P ≤ 0.01) higher than that reported in fresh water. Load of elements such as Ag, Be, Cd, Co, Cr, Cu, Li, Mo, Ni, Pb, Sb, Se, Sr, Ti and V in the soil found under the different tree types was not significantly (P ≥ 0.05) different between fresh and treated waste water. However, irrigation with treated waste water resulted in significantly (P ≤ 0.01) higher soil content of As, Ba, Ca, K, Mg, Na and Si (8.37, 49, 666, 1217, 821, 311.3, 61368 ppm, respectively) as compared to fresh water (02.08, 41, 800, 1058, 1305, 370.7, 23862 ppm, respectively). Generally, the content of Al, As, Ba, Cr, Cu, Fe, Li, Ni, P, Pb, Si, Ti, V and Zn in the different plant parts irrigated with waste water was significantly (P ≤ 0.01) higher than that irrigated with fresh water. The study concluded that (1) use of treated waste water for irrigation of plants my create environmental hazards, (2) production activities at the refinery site have introduced lots of heavy metals in the soil due to air pollution and (3) Moringa showed higher capacity for accumulation of metals and could therefore be used for bioremediation of soil pollution with heavy metals.
URI: http://khartoumspace.uofk.edu/123456789/27067


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