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Showing 3 results for Rezaeian

Tooran Yarahmadi, Mazyar Peyda, Mehran Mohammadian Fazli, Rizan Rezaeian, Negin Soleimani,
Volume 1, Issue 2 (3-2016)

Background: Turbidity removal using inorganic coagulants such as iron and aluminum salts in water treatment processes causes environmental and human health concern. Historically, the use of natural coagulant to purify turbid water has been practiced for a long time. Recent research indicates that Descurainia Sophia seed can be effectively used as a natural coagulant to remove water turbidity.
Method: In this work, turbidity removal efficiency of Descurainia Sophia seed extract was compared with Ferric chloride. Experiments were performed in laboratory scale. The coagulation experiments were done with kaolin as a model soil to produce turbidity in distilled water. The turbidity removal efficiency of Descurainia Sophia seed extract and Ferric chloride were conducted with jar test apparatus. In all experiments, initial turbidity was kept constant 100(NTU). Optimum combination of independent variables was used to compare two different types of coagulants.
Result: The obtained results showed that Ferric chloride could remove 89.75% of the initial turbidity, while in case of Descurainia Sophia this value was 43.13%. The total organic carbon (TOC) analysis of the treated water using seed extract showed an increased concentration of TOC equal to 0.99 mg/L.
Conclusions:This research has shown that Descurainia Sophia seed extract has an acceptable potential in the coagulation/flocculation process to treat turbid water.

Rezan Rezaeian, Mazyar Peyda, Mehran Mohammadian Fazli, Tooran Yarahmadi,
Volume 1, Issue 3 (6-2016)

Background: Water treatment sometimes needs a coagulation and flocculation process to remove suspended and colloidal materials. Inorganic coagulants used create concerns about pollution of the environment and harmful effects on the human’s health. The studies carried out previously indicated the capability of an active coagulant agent extracted from Descurainia Sophia seed to remove turbidity of water.
Methods: The purpose of this study was to investigate the effect of NaCl (0.05-1 gL-1), NaOH (0.01-0.1 gL-1), extraction duration (1-25 min) and the ultrasound frequency (0-45-75 kHz), used in the extraction of Descurainia Sophia seed, on the generation of color in purified water and to provide a model to predict the effects of the studied variables on color generation. Extraction was performed using water as solvent, supplemented with NaCl and NaOH and irradiated by ultrasound. Design of experiments and analysis of results were conducted by the D-optimal method based on the response surface methodology (RSM).

Results: The results demonstrated that only the effect of concentration of NaOH is significant in color generation (with p&It;0.05).
Conclusion: The effect of NaOH on color generation in purified water is predictable by the use of a statistically valid linear model at a confidence level of 95%.

Yahya Pasdar, Seyed Mostafa Nachvak, Mitra Darbandi, Mojgan Morvaridzadeh, Shahab Rezaeian, Milad Daneshi Maskooni,
Volume 5, Issue 3 (9-2019)

Background: Food security and access to sufficient healthy food are the basic needs of humans. Food insecurity may cause severe health and nutritional problems. Therefore, assessment of food security and the influential factors is essential in different communities. The present study aimed to determine the prevalence of food insecurity in the households in Kermanshah in the west of Iran.
Methods: This cross-sectional study was conducted at 1,185 households in Kermanshah city, which were selected from eight areas via cluster sampling. Data were collected using the questionnaire of the United States Agency for International Development (USAID). Data analysis was performed in SPSS version 16 using the Kolmogorov-Smirnov test, Pearson's correlation-coefficient, and Kruskal-Wallis test.
Results: In total, 69.5% of the households had food insecurity. Significant correlations were observed between food insecurity and family size, occupation status of the household head, number of rooms, monthly income, and education level (P = 0.001).
Conclusion: According to the results, food insecurity was highly prevalent in the families in Kermanshah. Therefore, planning and implementation of interventional programs by organizations are recommended for better food access and improving the quality and quantity of food consumption in families.

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