Showing 4 results for Nabizadeh
Z Ahadi, L Nabizadeh-Asl , M Akbari, H Mozaffari-Khosravi , A Nadjarzadeh ,
Volume 12, Issue 3 (12-2013)
Abstract
Background: Consumption of dairy products in teenagers is very important for achieving optimum growth. Accordingly, the related government offices have distributed free-milk in schools in recent years. This study was designed to determine the acceptance of this intervention among the girl high schools in Yazd.
Methods: In this cross-sectional study, 703 students were selected randomly from the two educational regions of Yazd city. Data were collected by demographic questionnaire and questionnaires about the number of weekly consumed milks, knowledge and attitude. Data were then analyzed by SPSS version 16.
Results: The results showed that 37% of the students did not consume milk at all. There was no correlation between the knowledge and acceptance of milk although there was a correlation between the attitude and acceptance of milk among the students. Among those who had consumed milk, 63 % noted benefits of milk for their health as the reason for its consumption. Of the students who had not consumed milk, 64% did not drink it for its bad taste.
Conclusion: Considering the results, acceptance of distributed milk was not good and according to this study, the major reason of not using distributed milk was its undesirable flavor. Therefore enhancement of quality and taste of milk distributed by the government can help boosting the student's interest to consume it and to obtain most advantage of the program.
K Nadafi, N Rastkari, R Nabizadeh, M Gholami, M Sarkhosh,
Volume 12, Issue 4 (3-2014)
Abstract
Abstract
Introduction: Many industries such as manufacturers of pesticides, paints and pharmaceutics produce large amounts of 2,4,6-Trichlorophenol (TCP). Due to its high toxicity and environmental pollution TCP is classified as a leading hazardous compound. The aim of this study was to investigate the TCP removal by using zeolite (clinoptilolite) modified with surfactants from the aqueous solutions.
Methods: In this study, the granulated and modified zeolite with surfactant Hexadecyltrimethyl Ammonium Chloride were investigated through the impact of the parameters such as pH (3, 5, 7 and 9), time (5 to 240 min), initial concentration of TCP (50 to 200 mg/L), and adsorbent dose (10 to 60 grams per liter) in a batch laboratory scale. The concentration of TCP was measured using a UV-vis Spectrophotometer at the wavelength of 517 nm.
Results: Results showed that TCP uptake reaches equilibrium after 45 minutes and with increasing concentrations of 50 to 200 mg/L, the absorption rate of 4.04 mg/g to 12.22 mg/g can be increased. According to the results, the amount of TCP adsorption capacity at pH 3, 5, 7 and 9 was 7.02, 7, 4.76 and 4.16 mg per gram, respectively. Increasing the dose absorption of 10 to 60 g/L at constant TCP concentration 200 mg/L also increased the removal efficiency of 60.41% to 87.29% and reduced the absorption capacity of 12.78 mg/g to 2.85 mg/g. Data also showed that the Langmuir isotherm (R2=0.989) and pseudo second-order kinetic (R2>0.99) are compliance.
Conclusion: The results of the study showed that the Iranian modified zeolites can be used effectively in removal of TCP in comparison with other parts of the world. Considering the cost, availability and ease of modification, it can be used to remove TCP in water and wastewater.
Gh Kiani, Ah Mahvi , Mh Dehghani , R Nabizadeh,
Volume 12, Issue 4 (3-2014)
Abstract
Introduction: Untreated leachate is being discharged into the environment in many countries worldwide. Leachate treatment methods have not been unified so far due to variable composition of leachate in different sites. Lack of control as well as disregarding leachate treatment and disposal of it can cause environmental pollution. This study aimed to investigate the Coagulants' effect on the COD (Chemical Oxygen Demond) and TSS(Total Suspended Solids) removal from Isfahan composting leachate. Ferrous sulfate, Ferric chloride,Poly ferric sulfate, Alum and Poly aluminium chloride were used in addition to two cationic and anionic commercial co-coagulants.
Methods: In this experimental study, leachate samples were collected from the Isfahan composting leachate collection ponds. At first, Leachate characteristics were measured according to standard methods. Jar-test experiments were carried out to examine the effects of changing coagulants' dosage (0/5,1,1/5,2,2/5 and 3 g/l) and PH values (4,5,6,7,8,9,11 and 12) on COD and TSS removal. As a result, the effective dosage, optimum pH and the most convenient coagulant were identified.
Results: According to the results, polyferric sulfate reached the highest COD and TSS removal efficiency were at pH= 11, with 2 g/L of poly ferric sulfate, the COD removal efficiency was 49% while the dosage of 2.5 g/l of this coagulant levelled at 51% of TSS removal efficiency.The co-coagulant K350CF, while used along with polyferric sulfate, reached the highest level in COD and TSS removal efficiencies which were 53% and 52% respectively.The highest COD removal efficiency using co-coagulant LT25 was related to poly-aluminum chloride, equal to 49% .
Conclusion: The most effective coagulant for COD and TSS removal was polyferric sulfate which contributed to better results with an alkaline pH. From the results obtained, it may be stated that Coagulation-flocculation can be used as a convenient inexpensive pretreatment process to treat Isfahan composting leachate, processing the leachate for a better and more convenient treatment compared with other methods.
H Mozaffari-Khosravi, L Nabizadehasl, M Akbari , Z Ahadi, B Talaei,
Volume 13, Issue 3 (9-2014)
Abstract
Introduction: Evaluation of grow this particularly important in children. It has to use the standard data necessarily. Due to genetic difference sand patterns of people living in different areas, national or local needs are better to be considered rather than the international ones. The aim of this study was to determine the height, weight and BMI of the children6-11 years old in the city of Yazd
Methods: In this cross-sectional study,2592 student (6-11 years old)were selected by cluster sampling in 26 schools and all students in one class from each grade in the academic year2010-2011 in Yazd–Iran. Height, weight and body mass index of the children were measured. Using the SPSS curve, the height, weight and body mass index by age and sex were calculated and compared with the WHO and CDC standards.
Results: Height-for-age percentile curves of girls were below CDC standard features. The 5 and 15 percentiles of weight-for-age of male in most age groups were also below CDC data. The 95 and 97 percentiles of body mass index of male and female children aged over 10 years were higher than foreign standards.
Conclusion: Due to the differences seen between the curves for height, weight and body mass index in Yazdian children and foreign standards, it is better to use the norms of this study for Yazdi children 6-11 years old.
