Showing 8 results for Asad
Y Hamzeh, S Izadyar, E Azadeh, A Abyaz, Y Asadollahi,
Volume 4, Issue 1 (24 2011)
Abstract
Background and Objectives: The dyestuff manufacturing and textile industries consume a high volume of water and produce a great amount of wastewater containing various toxic substances. Different methods are used to remove dye compounds from wastewaters. Removal of dyes from water by adsorption processes received considerable attention and a number of studies focused on the adsorption of some dyes by non-conventional low cost and effective adsorbents. In this study, the suitability of the canola stalks for Acide orange 7 adsorption was assessed.
Materials and Methods: The dry canola stalks obtained from the research farm were milled and screened and the particles size ranged between 0.4-0.7mmwere used in all experiments. Acid orange 7 supplied by Alvan Sabet. Initially, the effects of initial dye concentration, pH and temperature on adsorption were examined. The kinetic and equilibrium data obtained for various concentrations of evaluated on the basis of Langmuir and Freundlich isotherms.
Results: The results showed that the absorption efficiency depended strongly on pH and slightly on the temperature. Absorption of acid orange 7 on the canola stalks was fairly rapid and more than 95% of adsorption occurred within the initial 5 minutes of the treatment. Both Langmuir and Freundlich models were applicable for the description of acid orange 7 dye adsorption by canola stalks.
Conclusion: According to the Langmuir model, the highest capacity of canola stalks for acid orange 7 adsorption was found 24.8 mg/g which was higher than the capacity of beech wood sawdust and soil mixture with fly ash.
Fazlollah Changani, Anvar Asadi, Gholam Ali Haghighat, Amir Hossein Mahvi,
Volume 5, Issue 1 (6 2012)
Abstract
MicrosoftInternetExplorer4
Background
and Objectives: since there is not any information about
the quality and quantity of carpet cleaning wastewater, this study was done for
the evaluation of carpet cleaning wastewater
characterization in Tehran.
Materials
and Methods: There are 122 carpet-cleaning units in Tehran. Compound
samplings were taken from 10 randomly selected carpet-cleaning units. Each unit
was sampled 5 times and analyzed based on the Standard Methods. Quality
parameters measured included chemical oxygen demand (COD), detergent, color and
suspended solids (SS), and data was analyzed using statistical software spss16.
Results: Results showed that the amount of water usage for carpet cleaning was 30.84
liters per square meter of carpet washed. The average level of COD, color,
detergent and SS in the effluent of carpet cleaning unit was 367.4 mg/l, 171.85 ADMI, 55.51 mg/l and 359.62
mg/l, respectively.
Conclusion: The effluent characteristics of carpet cleaning units are almost with in the
domestic wastewater range. However, since these wastes are disposed untreated
into the environment which are then enter surface and groundwater, all measured
parameter were higher than proposed standards regulated by EPA, So treating
process must be done before disposal.
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Hafez Golstanifar, Simin Nasseri, Amir Hossin Mahvi, Mohamad Hadi Dehghani, Anvar Asadi ,
Volume 5, Issue 4 (15 2013)
Abstract
Background and Objectives: The contamination of nitrate (NO3−) in groundwater resources causes two adverse health effects: induction of “blue-baby syndrome” (methemoglobinemia), especially in infants, and the potential formation of carcinogenic nitrosamines. The aim of this research is to investigate nitrate removal from groundwater using alumina nanoparticles and to determine the adsorption isotherms.
Materials and Methods: This analytical-descriptive study was carried out at lab-scale, under batch conditions, and at room-temperature. The structure of alumina nanoparticles was determined using XRD, SEM, and TEM techniques. The concentration of nitrate in the solutions was determined by spectrophotometer at wavelengths of 220 and 275 nm. In addition, we investigated the impact of the important operational parameters including initial dose of Al2O3 (0.06-0.25 g/l), initial concentration of the solution (50- 300 mg/l), contact time (5-60 min), and pH (3-9). Moreover, we used Freundlich and Langmuir isotherm models to calculate equilibrium constant.
Results: It was found that nitrate removal efficiency increased as we increased contact time, initial concentration and pH in batch system. A maximum of 60% nitrate removal was achieved under following conditions: 60 min contact time, pH 5, and initial nitrate concentration of 300 mg/l as N. The obtained results showed that the adsorption of nitrate by Nano-Gamma-Alumina follows Langmuir isotherm equation with a correlation coefficient equal to 0.982.
Conclusion: Overall, our findings showed that the alumina nanoparticles can be used as an effective adsorbent to remove NO3 from aqueous solutions.
Mohammad Malakootian, Mahdi Asadi, Amir Hossein Mahvi,
Volume 5, Issue 4 (15 2013)
Abstract
MicrosoftInternetExplorer4
Background and Objectives: Synthetic dyes represent one of the largest groups of
pollutants in wastewater of dying industries. Discharging these wastewaters
into receiving streams not only affects the aesthetic but also reduces
photosynthetic activity. Electrochemical advanced oxidation processes such as
Electro-Fenton process are low operational and have high mineralization degree
of pollutants. In this study, we investigated affective factors in this process
to determine the optimum conditions for dye and COD removal from aqueous
solutions containing Reactive Blue 19 dye.
Materials and Methods: Synthetic samples containing Reactive Blue 19 dye were prepared by dissolving
dye powder in double distilled water. and the the solution prepared was
transferred into pilot electrochemical cell having two anode and cathode
electrode made of iron and carbon. Electro-Fenton process was began by adding
of Fe
2+ ions and establishing electrical potential difference. After
testing and at specified time intervals, each sample was collected from the
pilot cell, and process performance was evaluated through measuring dye
concentration and COD.
Results: Based on the
results obtained, optimum conditions of Electro-Fenton process for dye and COD
removal was determined. Accordingly, potential difference of 20 volt for dye
concentration up to 100 mg/L and potential difference of 30 volt for dye
concentration of more than 200 mg/L, reaction time 60 minutes, 0.5 mg/L of Fe
2+ concentration and suitable pH for the maximum dye removal efficiency equaled 4
respectively. Under such conditions, the dye and COD removal was 100 and 95%
respectively.
Conclusion: Based on
the results obtained, it was revealed that Electro-Fenton process has
significant ability in not only dye removal but also in COD removal.
Accordingly, it was found that the effective parameters in Electro-Fenton
process for removal Reactive Blue19 dye are electric potential difference,
concentration of iron ions and electrolysis time.
Fatemeh Mousavi, Seyed Adel Jahed, Asadolah Rajab, Amir Kamran Nikuo Sokhantabar, Giti Kashi, Rouzbeh Tabatabaee,
Volume 6, Issue 1 (5-2013)
Abstract
Background and Objectives: Air pollution and its effects on human health had become a major concern of many healthcare centers decision makers. In this study, air pollution effect on variation of Glycosylated Hemoglobin A1C (HbA1C) level in diabetic patients was evaluated, which is a unique study in Iran and Middle East region.
Materials and Methods: During November-January 2010-11, Tehran, capital of Iran, was exposed with high levels of air pollution. A retrospective cohort study was carried out on 330 patients diagnosed with diabetes mellitus for at least 12 months referring to 3 endocrinal care clinics. A questionnaire in two demographic and diabetic related sections was prepared. The patients' HbA1C level recorded on November-January 2009-10 was compared with November-January 2010-11. Descriptive analysis and paired t-test were carried out using SPSS 18 software.
Results: The patients investigated were divided into two groups. The first group was composed of 108 patients (53.7% female and 46.3% male) with diabetes mellitus type I (Insulin Dependent), age mean of 17.22, and SD of 11.57. The second group was composed of 222 patients (58.6% female and 41.4% male) with diabetes mellitus type II (Noninsulin Dependent), age mean of 53.91, and SD of 12.12. The change of HbAIC level in both groups wa not statistically significant in first group, HbA1C level increased from 7.71 to 7.75 mg / 100 ml (P =0.828) and in second group, it increased from 7.06 to 7.08 mg / 100 ml (P = 0.798).
Conclusion: According to the results obtained, it can be concluded that relation of air pollution and HbA1C mean variation in diabetic patients was insignificant.
P Nourozifard, S Mortazavi, S Asad, N Hassanzadeh,
Volume 11, Issue 3 (12-2018)
Abstract
Background and Objective: Marine sediments are the most important component of monitoring the health of aquatic ecosystems. The present study uses sediment quality indices to determine the contamination status in Qeshm ecosystems and to evaluate the toxicity of the elements studied for its organisms.
Materials and Methods: Sampling of surface sediments of seven stations was carried out on Qeshm coastal areas. The samples were digested by a combination of nitric acid and perchloric acid, and the concentration of metals was measured by atomic absorption spectrometry.
Results: The results of modified Hazard Quotient indicated a high pollution rate for copper and nickel metals in most stations, which was consistent with the results of the Potential Contamination Index in relation to nickel metal. Additionally, the results of the Potential Contamination Index and Contamination Factor agreed with the amount of lead element. According to the results, the pollution index of Hamoon Lake and Zakeri pier was highly contaminated and Modified Pollution Index demonstrated a contamination in Romacha, Hamoon Lake, Zakeri pier and Nazes areas. The enrichment factor associated with contamination regarding most of the heavy metals confirmed the indices used to evaluate the comtamination in the study area.
Conclusion: Due to the higher concentrations of the heavy metals in the sediments than that of the quality guidelines, the high toxicity of sediments for the aquatic ecosystems was confirmed. The Romachah, Hamoon, Zakeri stations showed higher pollution levels and sever toxicity for aquatic life. Copper, nickel and in some cases lead, were the main heavy metals that contaminated the sediments in the region.
Reza Kheiri Soltan Ahmadi, Habib Nazarnejad, Farrokh Asadzadeh,
Volume 14, Issue 4 (3-2022)
Abstract
Background and Objective: With the industrialization of communities, population increase and use of surface water, river pollution has been increased by agricultural, industrial pollutants and urban wastewater. Therefore, investigation of river pollution for regional and environmental planning is of great importance. To evaluate surface water pollution, a number of surface water quality indices have been investigated.
Materials and Methods: Iran water quality index for surface water resources (IRWQISC) approach was used to evaluate the water quality of the Mahabadchai river, Iran. Sampling was carried out along the Mahabadchai river based on some criteria such as approximately to drainage areas for landfills/domestic and agricultural effluents.
Results: Pearson correlation coefficient between physical, chemical and microbial parameters of water showed that fecal coliform, BOD, COD, nitrate, ammonium, phosphate, turbidity and total hardness had a significant positive relationship with each other at 99% confidence. According to this index, upstream samples of the river are classified as good, mid-stations relatively good to moderate category, and downstream samples of the river are classified as relatively bad.
Conclusion: Based on the relationship between each variable, fecal coliform, BOD, COD, ammonium, and turbidity were more effective in determining the IRWQISC. Most of the examined variables showed low concentrations in upstream areas of the river while their concentration gradually increased along the river to downstream areas, especially close to urban and industrial districts.
Safieh Hassanzad, Hossein Pirkharrati, Masoumeh Ahangari, Farrokh Asadzadeh,
Volume 17, Issue 1 (6-2024)
Abstract
Background and Objective: One of the significant challenges in mining areas is the pollution of the environment by heavy metals. Therefore, it is crucial to assess the pollution risk associated with mining wastes and take action to mitigate their environmental impact. The current study assessed the risk potential of recently deposited tailings in the Songun copper mining area.
Materials and Methods: Based on the conditions of tailings, 26 samples were randomly selected from the recently deposited mine wastes. Twenty-two thin and thin polished sections were prepared for lithology and mineralogy studies. Inductively-Coupled Plasma Mass Spectrometry (ICP-MS) was employed to analyze all 26 samples, while X-ray diffraction method (XRD) was used to analyze a subset of 10 samples.
Results: Sulfide minerals, as the main source of environmental pollution, remain intact and unaffected in the tailings. However, the majority of potentially toxic elements (PTEs) exhibit higher concentrations in the waste composition than the standard levels, resulting in a total ecological risk index of 49.93. Geochemical indicators highlight significant pollution levels for elements such as lead (Pb), arsenic (As), and copper (Cu). The values of the non-carcinogenic risk index for children (except As and Fe) and adults are lower than 1, indicating a non-significant non-carcinogenic health risk. However, the carcinogenicity index also indicates a significant carcinogenic risk in the case of long exposure to wastes, particularly for children.
Conclusion: Therefore, wastes pose a significant environmental risk potential, and due to this risk, proper management of their storage is necessary to prevent the release of PTEs into the environment.
