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Tehrān, Iran

Ghiyasi S.,Islamic Azad University at Tehran | Karbassi A.,University of Tehran | Moattar F.,Radio isotope Division | Modabberi S.,Pardisan Park
Journal of Food, Agriculture and Environment | Year: 2010

Based on the specific ecological condition in Markazi province, agriculture is one of the most important crafts, which is in the third priority of the industry and has particular place in province. In late decade with development of technology, global consumption of chemical ingredients especially in developing countries has considerable growth. In such a way, from 1940's to early 1980's production of different chemical industrial ingredients became 340 fold and million tons of materials released to the environment. Because of that we attempted to identify the concentration of heavy metals in the soil of Iralko complex with element resource, bioavailability and intensity of pollution. The Screen 3 software was used and modeling of air contamination was done and in the end the places under influence of contamination were distinguished. Elements in anthropogenic portions did not have any significant relation. According to the rate of the concentration of bioavailable elements, Sn allocates the maximum concentration. In this way considerable effect of metal contamination in soils of Iralko factory was not observed and index of I confirmed it. Source


Alipour S.S.,Islamic Azad University at Tehran | Karbassi A.,University of Tehran | Monavari S.M.,Islamic Azad University at Tehran | Mehrdadi N.,University of Tehran | Mohammadizadeh M.J.,Pardisan Park
Fresenius Environmental Bulletin | Year: 2012

Behavior of metals during estuarine mixing can significantly influence the chemical mass balance between rivers and seas or lakes. In the present study, the removal of dissolved metals Cu, Ni, Zn, Pb and Mn in Zarinehrud River water during estuarine mixing with Uremia Lake is investigated. In flocculation vessels, filtered river water and lake water were mixed together at room temperature in various proportions yielding 6 different salinities (2 to 12‰). The results show that pH is the most important governing factor in the flocculation of the studied metals, and Eh, that pH is the most important governing factor, EC and salinity have a reverse effect on flocculation process in Zarinehrud River estuary. Rapid flocculation in the lower salinity regimes was observed (2 to 6‰). The final flocculation rate of the studied metals was in the following order: Mn (75%) > Ni (74%) > Zn (67%) >Pb (63%)> Cu (48%). Source


Rashidi Z.,Islamic Azad University at Tehran | Karbassi A.R.,University of Tehran | Ataei A.,Islamic Azad University at Tehran | Ifaei P.,University of Tabriz | And 2 more authors.
International Journal of Environmental Research | Year: 2012

7500 tons of municipal solid waste produced in Tehran city is land-filled in Kahrizak disposal site. The leachate of the waste has created a lake with 180000m3 in volume. A plant is under construction to treat the leachate. A significant amount of biogas can be produced in anaerobic digestion phase in the treatment plant reactor. The designing process of a power plant in accordance with the produced biogas has been discussed in the present study. In the present investigation the air pollution from power plant has also been modeled. The leachate organic load (BOD=34400 mg/L and COD=53900 mg/L) is considerably higher when compared with other countries due to higher amount of organics available in Tehran wastes. The results indicate that an amount of 33504 m3/d biogas can be produced in Tehran's landfill that eventually would be sufficient to run a power plant of 3.4 MW capacities. The plant which is designed by Thermoflow software is consisted of two gas turbine units with 2 MW capacities so that the total capacity is 4MW. About 10% of the generated power is for in-plant consumption and the rest can be sold. The results of the air pollution modeling using Screen 3 software reveal that CO and PM amounts are in allowed range but N2O exceeds the standard limits. The high temperature of the outlet gases emitted from gas turbines makes it possible to warm up water and regulate the anaerobic reactors temperature. Source


Fatemi S.M.R.,Islamic Azad University at Tehran | Nabavi S.M.B.,Pardisan Park | Vosoghi G.,Islamic Azad University at Tehran | Fallahi M.,Guilan Aquaculture Research Institute | Mohammadi M.,Islamic Azad University at Tehran
Iranian Journal of Fisheries Sciences | Year: 2012

Cochlodinium polykrikoides was bloomed in the Persian Gulf for the first time in September 2008, started from the Strait of Hormuz and then spread out towards the northern parts covering most of the areas of the Gulf and lasted 8 months. In order to find out environmental conditions during the bloom, a monthly sampling program was carried out in seven surface stations in 2008-2009. At each station, three samples (triplicates) were collected for phytoplankton analysis and also one sample for environmental analyses, including salinity, chlorophyll a and nutrients. Blooms of C. polykrikoides were observed with a seawater temperature of 20.1 to 31.0 °C, salinity 37.0-40.1 ppt and nutrient concentration ranges during the bloom and red tide were 0.064-0.707 mg/l nitrate + nitrite and 0.001-1.66 mg/l phosphate, respectively. Maximum of C. polykrikoides abundance was measured 26 × 10 6 cells L -1 in October 2008. Kruscal wallis test demonstrated a significant difference in densities and chlorophyll-a in different months and seasons not in different stations. This study showed increase of temperature (>31.0 °C) stopped bloom and red tide due to C. polykrikoides in both the eastern and middle sampling stations but in the western stations was determined decrease in nutrient amounts as the major factor therefore increased nutrient of coastal waters, and environmental conditions could have efficacy the occurrence of this dinoflagellate. Source

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