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Showing 5 results for Nemati
Performance Comparison of Fenton and Fenton  Modified with Copper in Raw Wastewater Disinfection  for reuse in Agriculture
Ramin Nabizadeh Nodehi, Hassan Aslani, Mahmood Alomohammadi, Reza Nemati, Kazem Naddafi, Maryam Ghany,
Volume 5, Issue 2 (13 2012)
Abstract
MicrosoftInternetExplorer4 Background and Objectives: Irrigation of agricultural crops using wastewater will increase, in some cases, their growth by 40 to 60 percent. However, this has a high risks for human health because of the presence of higher number of pathogenic organisms. The main purpose of this study was to investigate the feasibility use of Fenton and modified Fenton with copper for the disinfection of raw wastewater.
Materials and Methods: After primarily laboratory physicochemical and biological analysis, the disinfection process was performed in three different phases in each process. First, the disinfectants were injected separately, then we performed disinfection using Fe++ and cu++ ions combined with hydrogen peroxide in order to determine synergistic effect of each catalyst. Direct method was used for fecal coliforms counting. 
Results: Hydrogen peroxide maximum efficiency for inactivation of fecal coliforms was only 0.66log inactivation. Fenton and modified Fenton with copper ions showed a remarkable effect on the bacterial inactivation so that Fenton and modified Fenton with 1 and 2 mg/l of Cu++ inactivated coliforms by 4.73, 3.28, and 4.88 log respectively.
Conclusion: Application of HP alone for the disinfection of raw wastewater is not practicable due to low observed efficiency. However, its combination with ions such as Fe++ and Cu++ increases HP performance in disinfection and has a notable synergistic effect on HP  disinfection power, where, in the presence of each catalyst, hydrogen peroxide can reduce the fecal coliforms of raw wastewater to meet the Iranian Environmental Protection Agency Standards.


Distribution and Source identification of Polycyclic Aromatic Hydrocarbons (PAHs) in the Sediments of the Southwest Caspian Sea Coasts: Gillan Province
M. Nemati Varnosfaderany, A. Riyahi Bbakhtiari, Z. Gu, G. Chu,
Volume 7, Issue 3 (5-2014)
Abstract

Background and Objectives: Few investigations on polycyclic aromatic hydrocarbons (PAHs) in surface sediments have reported medium to high petrogenic contamination at the southwest coasts of the Caspian Sea. The aim of this study was to investigate distribution and potential sources of 16 PAH compounds in surface sediments of the southwest coasts of the Caspian Sea (Gillan province). Materials and methods: A total of 45 sediment samples from 15 stations at coasts of the Gillan province (from Astara to Lahijan) were collected from 10, 20, and 50 meters depths. Each sample was analyzed using Gas chromatography – Mass spectrometry. Diagnostic ratios were used for source identification. Results: The main PAH compounds in the study area were phenanthrene (87.6±74.6 ng/g), pyrene (43.1±23.5 ng/g), and naphthalene (34.4±40.4 ng/g) respectively. According to the calculated diagnostic ratios such as LMW/HMW (0.25-7.75), Ant/178 (0.02-0.11), Flu/202 (0.20-0.49), and B(a)Ant/228 (0.09-0.54) the main source of PAHs is petrogenic in this study area. Conclusion: According to PAH diagnostic ratios and similarity of dominant PAH compounds in study area with dominant PAH compounds of Azerbaijan oil field, main probable source of PAH compounds in Gillan province coasts is Azerbaijan oil pollution.


Pollution potential and ecological risk of heavy metals in municipal wastewater treatment plants sludge
Bahareh Ghoreishi, Hassan Aslani, Mohammad Shaker Khatibi, Sepideh Nemati Mansur, Mohammad Mosaferi,
Volume 13, Issue 1 (4-2020)
Abstract
Background and Objective: Application of sewage sludge contaminated with heavy metals may cause health and ecological concern. Ecological risk and heavy metals content of sewage sludge from wastewater treatment plants of East Azerbaijan province were evaluated in the present study.
Materials and Methods: Nine composite samples were taken and analyzed for heavy metals. The geo-accumulation index (Igeo), contamination factor(CF) , and potential ecological risk index were calculated.
Results: Variation of the heavy metals concentrations were in the following order: Zn>Cu>Pb>Cr>Ni>As>Hg>Cd. The contents of some heavy metals were several order of magnitude higher than the crustal average (CA) values. Considering the Maximum Permissible Standards (MPS) and the Muller's index, the Cd, Cu, and Zn pollution were found to be in the moderate range, whereas As and Pb were in strongly polluted category; and Hg was in extremely polluted category. Considering MPS, the single-factor pollution index (PI) and the Nemerow’s synthetic pollution index (PN) were lower than 1 and 0.7 respectively. This indicated that the sludges were unpolluted with most heavy metals and could be safely applied for agricultural uses. However, a high potential ecological risk for As and Cd; very high risk for Pb; and extremely high risk for Hg were calculated when considering the CA values. There were significant differences between the levels of heavy metals and MPS (p <0.05).
Conclusion: Although the metal concentrations were below the MPS according to the US EPA regulations, sludge samples showed a high degree of potential ecological risk for the environment in comparision with the CA values,. Periodic monitoring of sludge quality are strongly recommended.  

Heavy metals in blood and milk of grazing animals around the vicinity of Zanjan zinc industrial park
Mohammad Hossein Nemati,
Volume 14, Issue 3 (12-2021)
Abstract
Background and Objective: Environmental pollution with heavy metals and consequently their entry into food chains leads to irreparable damage to human health. The aim of this study was to determine the concentration of heavy metals including copper, zinc, lead and cadmium in blood and milk of grazing livestock around Zinc industry in Zanjan province (VSIPZ).
Materials and Methods: A total of 10 samples of grazing blood and milk were taken in each of the four geographical directions of the desired location. Also, in order to compare the current situation in the study area with the non-polluted areas, the control area (Qarah Poshtlu area of Zanjan) was considered. Dry ash method was used to digest organic matter.
Results: The results showed that the concentration of copper in the blood of cows and sheeps and the concentration of lead in the blood of cows in the west of VSIPZ was higher than the control group (p <0.05). There was no significant difference between the study areas and the control in terms of zinc and cadmium concentration in blood samples. Copper concentrations in cows and sheeps milk were lower than the control group in the southern and eastern regions of the VSIPZ, respectively (p <0.05). Zinc and lead concentrations in sheeps’ milk were higher than the control in the south and west of the VSIPZ, respectively (p <0.05).
Conclusion: In general, the results implied that the accumulation of lead in sheeps’ milk in the west of VSIPZ is more than maximum allowable concentration and can endanger the health of consumers.

The necessity of community-oriented and future-oriented revision in the educational content of the field of environmental health from the point of view of the beneficiaries (graduates and students)
Mohammad Mosaferi, Farhad Ghayurdoost, Reza Dehghanzadeh, Hassan Aslani, Sepideh Nemati Mansour, Neda Gilani,
Volume 16, Issue 1 (6-2023)
Abstract
Background and Objective: The trend of developments in the health system and medical education and other related sciences, including environmental health, is a global challenge. In this research educational content of environmental health and its revision were studied from the point of view of students and graduates.
Materials and Methods: The present study was a cross-sectional descriptive study. In this research, through two checklists, the opinions of environmental health students and graduates regarding the necessity of revising the educational content of the field according to the requirements of the time and considering the future situation were investigated with the participation of 441 people. Data analysis was performed using SPSS-22 software.
Results: According to the results, 73.7 percent of participants believed that the educational content of environmental health in Iran has fundamental differences from developed countries. 81.7 percent believed that the educational content provided to environmental health students is not proportional to their duties. Meantime, 91.4 percent of the graduates of environmental health believe that the expected capabilities included in the educational curricula of different degrees of environmental health should be revised. 88.4 percent believed that it is necessary to revise the educational content of this field considering the "change in executive and practical functions of environmental health during the past years".
Conclusion: The overwhelming majority of graduates of the field emphasized the need to revise the educational content of the environmental health field, taking into account the requirements of the time. It is necessary to redefine the field of environmental health in the country according to the changing situation and the emergence of new indicators.
 

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