Mohammad Hadi Abolhasani; Niloofar Pirestani; Ali Eslami
Abstract
Abstract Background and Aim: Increasing levels of toxic heavy metals in the environment have led to risks to the health of humans and living organisms. Materials and methods: First, some characteristics of rock wool including pH, EC, pHZPC, chemical composition, structure, and morphology were determined ...
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Abstract Background and Aim: Increasing levels of toxic heavy metals in the environment have led to risks to the health of humans and living organisms. Materials and methods: First, some characteristics of rock wool including pH, EC, pHZPC, chemical composition, structure, and morphology were determined using XRD, XRF, and Scanning Electron Microscopy (SEM). Adsorbing tests were then conducted in a non-continuous reactor using synthetic solutions containing nickel. Optimum adsorption conditions were determined concerning pH, metal initial concentration, contact time, and adsorbent dose. The data were analyzed in a completely randomized block design. Results: The highest adsorption was seen at pH = 5 and the lowest at pH = 3, with a significant difference. The absorption rate was significantly higher in the 5 mg/l solutions than in other concentrations and the lowest was observed at 100 mg/l concentration. The lowest nickel adsorption rate was observed in 5 min and the highest adsorption efficiency was observed in 90 min, with a significant difference. The adsorption percentage of rock wool waste at the 10 g/l doses was significantly higher than that in other adsorbent doses and the lowest adsorption percentage was observed at the 1 g/l dose. The isotherm studies showed that the adsorption of nickel by rock wool waste was consistent with the Freundlich model. Conclusion: It can be concluded that rock wool waste could remove nickel from industrial effluents.
Mohammad Hadi Abolhasani; Niloofar Pirestani; Parinaz Ahmadi
Abstract
Background and Aim: Petroleum products such as crude oil, gasoline and gasoline are the most commonly used in the world, the major pollutants of water. About 10 million tons of oil are burnt annually in the world. Therefore, the development of new technologies for the elimination and purification of ...
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Background and Aim: Petroleum products such as crude oil, gasoline and gasoline are the most commonly used in the world, the major pollutants of water. About 10 million tons of oil are burnt annually in the world. Therefore, the development of new technologies for the elimination and purification of oil pollution is essential. There are several methods for cleaning up oil pollution and its derivatives. In this research, straw and chalk absorber was used as an organic adsorbent to remove diesel oil from wastewater. Materials and method: The straw and chalk were firstly determined using the FT-IR analysis. Then the adsorption experiments were performed discontinuously using diesel oil laboratory solutions. Optimum adsorption conditions were obtained by changing the factors affecting adsorption including pH, initial concentration of contaminant, contact time and adsorbent amount on adsorption at different levels, The oil absorption was determined by weighting method. Ultimately, the use of adsorbent for laboratory wastewater was studied. Results: The highest absorbent efficiency at the time of equilibrium was observed for absorbing oil using straw and chalk absorber in 15 minutes, which did not have a significant difference with other contact times (49.85% absorbance, p < 0.05) and the lowest value was observed without a significant difference in 3 minutes (37.19% absorption). The effect of straw absorbent values in 2 g/L was significantly higher than other amount of adsorbents (51.48% absorption, p < 0.05) and the lowest percentage of adsorption was significantly different from other values in 0.25 And 0.5 grams per liter (38.30%, p < 0.05). The fitting of Isotherm showed that the adsorption of diesel oil by straw and chalk with both Freundwich and Langmuir models were consistent with the high R2 (R2 = 0.99 and R2 = 0.96).
Mohammad Hadi Abolhasani; Ehsan Rezai
Abstract
Background and Objectives: The solid waste in landfill is transformed into landfill gas during a biochemical conversion process called bio-degradation. Landfill gas is a product of waste decomposition containing 40 to 60 percent of methane and various amounts of other gases. The present project aims ...
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Background and Objectives: The solid waste in landfill is transformed into landfill gas during a biochemical conversion process called bio-degradation. Landfill gas is a product of waste decomposition containing 40 to 60 percent of methane and various amounts of other gases. The present project aims to estimate the proportion of environmental gases of Landfill No. 1 in Shahin Shahr (total landfill gas, methane gas and carbon dioxide gas), compare gas emissions over a 30 year period, and assess the capacity of the landfill for energy extraction. Material and Methods: The field of research was Landfill No. 1 at Shahin Shahr Recycling Plant (Isfahan) located in Ja’farabad Mountains, whose capacity was completed in 2010 and landfill gas assessment was carried out. The total amount of produced gases including methane and carbon dioxide was calculated using the first-order degradation model over a 30 year period. The proportions of these gases in Landfill were calculated from 2013 to 2043. Result:The results show that the amount of landfill gases production declined over the time. The maximum production of methane and carbon dioxide was about 350 and 950 thousand kilograms in 2013 and the minimum production of methane and carbon dioxide is estimated about 57 and 157 thousand kilograms, respectively, in 2043. The total volume of gases produced in this landfill has been estimated to be about 15 million cubic meters in 30 years, of which 27 percent is methane and 73 percent is carbon dioxide. The amount of methane and carbon dioxide gas is estimated to be about 5 million and 13 million kilograms in 30 years, respectivel. Conclusion:Generally, the landfill gases production declined over the time. It is recommended to use energy recovery technologies for controlling greenhouse gas emissions and generation of required energy for the ShahinShahr recycling plant in order to use this volume of gas.
mohammad hadi abolhasani; niloofar pirestani; hajar amini
Abstract
Background and aim: water oil contamination has occurred in Iran since the previous century and environmental oil accumulation threatens the country water resources’ health. There are several methods to remove oil and its derivatives contamination. In the present study, mineral wool waste was used ...
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Background and aim: water oil contamination has occurred in Iran since the previous century and environmental oil accumulation threatens the country water resources’ health. There are several methods to remove oil and its derivatives contamination. In the present study, mineral wool waste was used as low price adsorbent for wastewater oil contamination (kerosene) removal. Materials and methods: first, XRF and XRD analyses were used to determine chemical composition. Then, adsorption tests were conducted discontinuously using laboratory solutions containing oil to determine optimum adsorption conditions by adjustment of effective factors such as pH, initial concentration, exposure time and adsorbent concentration. Thereafter, application of adsorbent for laboratory wastewater was studied. Results: after 15 min exposure, the adsorbent (mineral wool wastes) efficacy was significantly higher than the other times (76.01 % adsorption; P<0.05); whereas, the lowest efficacy was observed after 3 min (63.82 %; P<0.05). Among the tested pH, the highest and lowest adsorption were observed at pH = 3 (70.59 %; P<0.05) and 9 (57.69 %; P<0.05), respectively. There was no significant difference in adsorption between the adsorbent concentrations of 0.5 and 1 g (76.80 and 75.30 %); however, both were significantly (P<0.05) higher than the other concentrations. the lowest adsorption was observed at the concentration of 0.25 g adsorbent (67.78 %). Isotherm fitting of surface adsorption showed that oil adsorption by mineral wool wastes follows Langmuir model (R2=0.99). Conclusion: it is concluded that mineral wool waste has high efficiency to adsorb oil from wastewater and could be used for oil contamination removal.