Heshmatollah Moradpour, Mohammad Mehdi Amin, Mahnaz Nikaeen, Arash Shafiee, Reza Molaei, Amin Sabouri, Mohammad Ghasemian, Fahimeh Teimouri,
Volume 6, Issue 5 (3-2011)
Abstract
Background: In this study, the inhibition rate of different oil concentrations containing PCBs (1242 and 1254 PCB Arochlors) on the anaerobic biomass was investigated by Specific Methanogenic Activity using the vials with volume of 120 ml. Methods: Original samples were divided into two groups: with soil containing PCBs and without PCBs and the control samples in both cases were just contained substrate, without adding oil. The concentrations were evaluated in three categories: low, moderate and high values, classified and compared together and with the control samples. Findings: the findings of this study indicated that 70% of the COD removal occurred in vials containing only two grams of soil. Biodegradation of PCBs containing oil was occurred by microorganisms without any delay in absence of oil containing 0.02 to 0.3 ml PCBs and without using oil containing PCBs. Conclusion: Maximum specific methane building happened in vials containing 0.1 ml oil. Thus optimal concentrations of oil containing PCBs vials that had maximum specific methanognic activity were equal to 0.1 ml with 0.1 ml of acetic acid as auxiliary substrate. And in the 1.5 ml oil input together with the Acetic acid as auxiliary substrate the concentration was inhibitor.
Fahimeh Teimouri, Mehraban Sadeghi, Fatemeh Drees, Hassan Hashemi, Kobra Shakeri, Somayeh Rezaei,
Volume 8, Issue 1 (5-2012)
Abstract
Background: Corrosion ratio, Defined as the destruction percentage of a metal by chemical reactions, in other words, the measurement of an invasion of water to pipes and rusty equipment. The main focus of previous researches has been the economic aspects of corrosion, but recently, it seems that is necessary to study the other aspects of corrosion, such as aesthetic aspects. This study was achieved during the period of 1388–1389 by focusing on identification of corrosion ratio in Kian city. Method: Seven points in Kian city (in Chahr Mahal va Bakhtiary province) were selected for sampling, (regarding the population density, area surface, and water distribution scheme). Temperature, calcium hardness ratio, CO2, alkalinity, TDS, SO4-2, Cl- and pH were measured. The analysis was based on the book of "standard methods for water and waste water examination" published in 2003. Findings: The results showed that the temperature and pH were the only parameters with the standard average. Calculation of Langlier and Rizner Indexes showed that the corrosion ratio increases gradually throughout the network (-0.68 and 8.52) mostly in the autumn and the winter. The results showed that 72% of samples with minor corrosion based on the Langlier index had major corrosion based on the Rizner index. Conclusion: the water network of Kian city has a variable corrosion ratio (minor to major). In order to make a more comprehensive and accurate decision, it is recommended to use Langlier and Rizner indexes together. Application of these methods is very simple in comparison with other methods.
Zinab Sadoghi, Alireza Teimouri, Ali Pezhhan,
Volume 16, Issue 1 (4-2020)
Abstract
Background: Being aware of both structure and correct demographic data in each country is essential for the economic, social, political and cultural planning as well as promotion in health indicators. This study is conducted aiming to examine the accuracy of housing census statistics in Iran and Ilam Province in 2006 and 2016.
Methods: The census data were extracted from the Statistical Center of Iran. Data prepared based on standard age and sex groups. Whipple and Myers methods were used to assess the accuracy of these data. In addition, in this study, the Whipple index was expanded for all digits.
Findings: Whipple indexes were 106.5 and 101.8 for Ilam Province and 111.5 and 104.1 for Iran in 2006 and 2016, respectively. Myers indexes were 1.40 and 4.9 for Ilam Province and 1.6 and 4.8 for total Iranin population in 2016 and 2006, respectively.
Conclusion: The study findings were indicative of a very high accuracy of the census data obtaine for Ilam Province and the country in 2016. Due to the high accuracy of the data, this information can be used to advance the country's health development programs
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