List of articles (by subject) Soil and water pollution with heavy metals
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Open Access Article
1 - The Use of Microorganisms In Bioremediation Of Heavy Methals In Soils
jina tanzadeh Mohammad panahandehBioremediation is an promising and available new technique for removal and recovery of heavy metals in contaminated land and waters. These microorganisms developed Different detoxifying mechanisms such as bioaccumulation, biosorption, biomineralization and biotrans MoreBioremediation is an promising and available new technique for removal and recovery of heavy metals in contaminated land and waters. These microorganisms developed Different detoxifying mechanisms such as bioaccumulation, biosorption, biomineralization and biotransformation.The food and water we consume are often pulluted very of chemicals and heavy metals, such as gold,copper ,nickel, zinc, cadmium, arsenic, lead, chromium, and mercury that are associated with very diseases.Some studies described microorganism able to bioremediation heavy methas. Among others some of the microorganisms that play great role in bioremediation of heavy metals are Pseudomonas spp ,Corynebacterium spp ,Bacillus spp Arthrobacter spp, Alcaligenes spp, Rhodococcus spp, Flavobacterium spp, Nocardia spp, Azetobacter spp, Methosinus, Phormidium valderium. Manuscript profile -
Open Access Article
2 - Compare of the Application of Nano and Micro Wastes as Supplying Source of Zinc in Cucumber Hydroponic Culture
sahar moghaddasi fathallah karimzadehIn recent years, disposal of waste tires is an environmental challenge in many countries. Previous researches has been shown that rubber waste ash and its nanoparticles can be used as an effective source of zinc (Zn) for plant. In this research, feasibility of using nan MoreIn recent years, disposal of waste tires is an environmental challenge in many countries. Previous researches has been shown that rubber waste ash and its nanoparticles can be used as an effective source of zinc (Zn) for plant. In this research, feasibility of using nanoparticles and rubber waste (as zinc supplying source in plant) is studied moreover comparing the nanoparticles of rubber waste with commercial zinc sulfate fertilizer available in the market. In this regard, moreover nanoparticles production and characterization them by scanning and transient electron microscope, these wastes were used in cucumber hydroponic culture, then the quantitative and qualitative performance of the fed products were compared with the commercial zinc sulfate fertilizer available in the market. According to the obtained results, by reducing the particle size of the rubber from micron to nano, Zn extractable percentage increased from 1.5 to 2.5%. So, using rubber nanoparticles increased plant performance and also, increased Zn concentration in plant tissues compared with commercial zinc sulfate fertilizer and those grown in control. Manuscript profile -
Open Access Article
3 - A Review of Arsenic Removal Methods from Water Resources
Marzieh Hasanzadeh Fariba OstovarMany of the pollutants in water are known to be harmful for human health and toxic for environment. Among these pollutants, Arsenic is more important because millions of people are exposed to contaminated drinking water. The World Health Organization (WHO) has identifie MoreMany of the pollutants in water are known to be harmful for human health and toxic for environment. Among these pollutants, Arsenic is more important because millions of people are exposed to contaminated drinking water. The World Health Organization (WHO) has identified the permitted limit of below 0.01 mg/L (10 micrograms per liter) for arsenic in drinking water and the same amount for arsenic has been reported in Iran's 1053 standard. In this study, various techniques have been investigated for removing Arsenic and efficiency of different nanoparticles in treatment of Arsenic from drinking water. Common methods of removing Arsenic from water sources are including oxidation, coagulation and flocculation, reverse osmosis and ultrafiltration, ion exchange, phytoremediation and new technologies based on the use of nanoparticles. The findings showed that despite of the high arsenic removal percentage using different methods such as oxidation, ion exchange and floating with dissolved air, these methods are not economic and a lot of time is required to achieve optimal efficiency. Recently, the use of nanoparticles has become very popular, so that metal oxide nanoparticles such as magnetic iron, Zinc, Copper, Serum, and Aluminum can completely eliminate Arsenic soluble with a high concentration of 50 mg/L in water sources and after the adsorbent is saturated, it is possible to use the regeneration of adsorbents, repeatedly by adsorbing the pollutant into the adsorbent. As a result, the use of nanoparticles is better than chemical processes and is economic due to their high efficiency in a short time. Manuscript profile -
Open Access Article
4 - Examining the amount of cadmium and lead in the soil downstream of Taybad landfill
akram ghorbani Mohammad ghafori Mohammad javad alipoorThe aim of this study was to investigate the emission of heavy metals (cadmium and lead) in the soil around Taybad landfill. For this purpose, 15 stations at a distance of 100 meters from each other to the landfill of Taybad city were selected for sampling. Sampling 5 s MoreThe aim of this study was to investigate the emission of heavy metals (cadmium and lead) in the soil around Taybad landfill. For this purpose, 15 stations at a distance of 100 meters from each other to the landfill of Taybad city were selected for sampling. Sampling 5 samples and repeating 3 times from each station, the samples were transferred to the laboratory for analysis to check the level of pollution indicators. Hypotheses were analyzed using one-sample t-test and Pearson's correlation coefficient with spss 24 software. It was found that the average total concentration of lead is equal to 52.04 and the average total concentration of cadmium is equal to 1.748. The concentration of the mentioned metals is significantly higher than the average global soil and earth's crust with 95% confidence. In the case of lead and cadmium, the highest contamination was in station 10 and 4, and the lowest contamination was in station 6 and 12, respectively. It is concluded that the amount of soil contamination does not change significantly with increasing distance, because the volume and concentration of contaminant runoff from the landfill (contaminant) along the path is constant. Therefore, it is better to provide environmental training for municipal municipal personnel and citizens of the region and to invest in the restoration of the environment and its further protection. Manuscript profile