List of Articles soil remediation

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  1 - Surveying the effect of electrokinetic together with leaching remediation on quality of drain water of a saline-alkaline soil
  محمد علی غلامی سفیدکوهی میثم رمضانی میر خالق ضیاء تبار احمدی
  The salinity of water and soil is called white death in many countries, because of its importance. Generally, the quantity of leaching water, energy consumption and time usage of soil remediation procedure are important factors which affect suitable method of soil recla More

  The salinity of water and soil is called white death in many countries, because of its importance. Generally, the quantity of leaching water, energy consumption and time usage of soil remediation procedure are important factors which affect suitable method of soil reclamation. Electrokinetic (EK) is a physical method for salt extraction such as chemical, Organic and inorganic compounds. In this study, the horizontal placement of electrodes along with leaching procedure was used in Electrokinetic remediation of a saline-alkaline soil. For this purpose, two aluminum and reticular electrodes was placed above and under the soil column as anode and cathode, respectively. The soil columns heights were 10, 20, 30 and 45 cm. Then leaching water (30 mm) every day and totally Equivalent to Four times pore water was entered to soil and properties of drain water was measured. Although, leaching procedure without applying electrokinetic technique was done as control treatment. The results showed that Electrical Conductivity (EC) of drain water and current rate was changed sinusoidal in EK. Although, PH and temperature of drain water was changed between 6.8 to 9 and 23 to 35 centigrade, respectively. Leaching of cations increased in EK technique significantly (p<0.05). Leaching of anions decreased, but this change was not significant. The ratio of Na+ leaching compared to Ca2+ and Mg2+ in EK treatments was 8.5 percent greater than controls. Generally, EK method changed EC, weight of leached salt per soil weight and PH of drain water significantly. Manuscript profile
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  2 - Investigation of Hexavalent Chromium Cr (VI) removal from contaminated clayey soil by simultaneous combination of electro kinetics and Nano zero-valent Iron as a permeable reactive barrier
  Nader Shariatmadari Mohsen Saeedi Hesam Daryaee
  Recently, a variety of soils contaminated with heavy metals e.g. Cr (VI), have been found in industrial sites. Such soil contamination is widely distributed in the world and has now become a serious issue for environment. Hexavalent Chromium, Cr (VI), which is known to More

  Recently, a variety of soils contaminated with heavy metals e.g. Cr (VI), have been found in industrial sites. Such soil contamination is widely distributed in the world and has now become a serious issue for environment. Hexavalent Chromium, Cr (VI), which is known to be carcinogenic and mutagenic to living organisms, has been utilized for leather tanning, electroplating and in other industries. Cr (VI) contaminated soil is mainly the result of improper disposal and leakage from reservoirs. Accordingly, finding promising technologies to remediate Cr (VI) from contaminated soils which provide high efficiency has drawn attention by many governmental officials to protect public health and the environment. This paper investigated the effectiveness of incorporating Nano zero-valent iron (nZVI) into electro kinetics (EK) to remediate Cr (VI) contaminated soil (100 mg/kg). The electro kinetic experiments were conducted using a 8 cm long sample under a constant electric gradient of 2 V/cm for 24 h. Results from the base experiment showed that the most Cr (VI) species migrated and accumulated near the anode reservoir. Based upon this result a reactive barrier was installed 2 cm away the anode electrode and was filled with nZVI and silica sand (1:2.5 w/w). The Cr (VI) reduction and removal efficiency for the processes with nZVI were 88% and 19, respectively. In other attempt the pH control in anode and cathode reservoirs has been considered to a value of 6.3 coupled with barrier installation near the anode reservoir to understand the effect of this phenomenon in remediation processes. Since the pH control in the reservoirs promotes the release of Cr (VI) from the soil by electro migration and permitting, the maximum interference with permeable reactive barrier results the increase of the removal of total Cr to 42% and 89.3% reduction of Cr (VI) to the Cr (III). Manuscript profile
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  3 - Feasibility of remediation of diesel contaminated soils using surfactants by use of experimental pilot
  Ehsan Salehian Ahmad Khodadadi Hossein Gangidoust
  Nowadays soil contamination by oil production due to leakage of fuel storage and transition hazards is an important environmental problem. Due to the additional hazard of transition to the human food chain, there is the possibility for pollution of ground water. Therefo More

  Nowadays soil contamination by oil production due to leakage of fuel storage and transition hazards is an important environmental problem. Due to the additional hazard of transition to the human food chain, there is the possibility for pollution of ground water. Therefore in situ remediation of oil contaminated soil is very important. In this investigation the effective parameters on diesel soil remediation by soil washing using SDS surfactant were investigated. For modeling of contaminated land remediation the contaminated soil columns was used. Soil columns were contaminated with diesel in amount of 10000 ppm and 20000 ppm. In this study the effect of pH, surfactant concentration in washing solution and initial contamination amount were investigated. Results showed that in all states the quantity of remediation for acidic states is very low and efficiency of remediation when using only water is (1:3) of maximum amount. For soil with initial contamination amount of 10000 ppm the maximum efficiency is for surfactant in concentration of 0.3 and pH=11 and for soil with initial contamination amount of 20000 ppm the maximum efficiency is for surfactant in concentration of 0.1 and pH=11. By increasing the amount of surfactant concentration the permeability of soil decrease and in pH=11 the amount of permeability is maximum. With increasing initial contamination quantity, the velocity of increasing of remediation and permeability decreased. Consequently in the low level of contamination the effect of washing solution pH in soil remediation is greater in comparison with high levels of contamination. Manuscript profile
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  4 - The Role of Biochar in the Remediation of Salt-Affected Soils
  Younes Shukuhifar Reza Hassanpour Bahman Khoshru Hossein Besharati
  Background and Objective: Salts accumulation in soil is a major threat to agricultural production and ecosystem sustainability. The cost imposed on agricultural productivity due to salinity and sodicity is very high and is expected to increase in the future with the exp More

  Background and Objective: Salts accumulation in soil is a major threat to agricultural production and ecosystem sustainability. The cost imposed on agricultural productivity due to salinity and sodicity is very high and is expected to increase in the future with the expansion of salt-affected areas. In the last decade, a great focus has been made on the application of biochar in farming systems with the primary aim of organic carbon sequestration in soil and subsequently reducing greenhouse gases emission to air and also reclaim soils, and increasing soil fertility. But these studies often were in non-saline soils and it is needed to study the biochar effect in salt-affected soils. Material and Methodology: Due to the lack of research on the role of biochar in salt-affected soils, this paper first provides an overview of the extent and problems of these soils. Then, the researches on the effect of biochar on soil properties, carbon sequestration, and remeduatuib if sakt-affected soils were reviewed and study and research gaps in this field were investigated. Findings: The application of biochar in the soil causes the sequestration of carbon in the soil and reduces the emission of greenhouse gases into the atmosphere. In the salt-affected soils, biochar, as an organic soil amendment, improves the physical, chemical, and biological properties of the soil, thereby mitigating the effects of salt on soil and plants. Discussion and Conclusion: Carbon sequestration and improvement of soil quality are the two reported general benefits of biochar application in soil. The results of researches in this field are different depending on the source and method of biochar preparation, soil properties, and experiment conditions. Therefore, various studies are needed to fully understand the mechanisms of biochar effect on the properties of salt-affected soils and their remediation. It is not possible to provide a practical solution by doing some research, but developing scientific findings in this field can guide future policies. Manuscript profile