مهدی صفری
(مسوول مکاتبات): - استادیار مرکز تحقیقات بهداشت محیط دانشگاه علوم پزشکی، کردستان، ایران،
[ 1 ] - بررسی کارایی فرایند انعقاد پیشرفته درحذف اسید های هیومیک از آب
زمینه و هدف: اسید های هیومیک بخش عمده ای از مواد آلی طبیعی هستند که اثرات منفی بسیاری، بخصوص واکنش با کلر و ایجاد محصولات جانبی گندزدایی، را در آب ایجاد می نمایند. به همین دلیل روشهای حذف این مواد از آب بسیار مورد توجه قرار گرفته است. انعقاد پیشرفته یک فرایند ساده، مناسب و موثر برای حذف مواد هیومیک از آب به شمار می رود. روش بررسی: در این مطالعه کارایی فرایند انعقاد پیشرفته با استفاده از ماده من...
[ 2 ] - Organic dye removal from aqueous media by using acid modified Clinoptilolite
Dyes are an important class of pollutants which when discharged into water resources can be toxic to the aquatic environment and cause serious problems for public health. Various treatment technologies such as adsorption are in use. For this reason, clinoptilolite was used as a low-cost adsorbent to remove color from aqueous solution. Clinoptilolite was modified with sulfuric and phosphoric aci...
[ 3 ] - Health impact assessment of exposure to PM10 in Ilam city using Air Q software
Air pollution is a major environmental issue in the world that can be harmful for human health. The aim of this study was to determine the health impacts of particulate matter with an aerodynamic diameter ≤10μm (PM10) in Ilam in 2013 and 2014. The air pollution data were obtained from the Ilam Department of Environmental Protection. The data were analyzed by Excel software, and...
[ 4 ] - The simultaneous removal of turbidity and humic substances from water using the enhanced coagulation process
This study aimed to investigate the efficiency of the enhanced coagulation (EC) process for the simultaneous removal of turbidity and humic substances (HS) from raw water from the Sanandaj Water Treatment Plant (SWTP). This study was conducted on a laboratory scale using a jar test device and ferric chloride (FeCL3) as the coagulant. Accordingly, the effects of pH and coagulant dosag...
[ 5 ] - Fabrication of ultrathin graphene oxide-coated membrane with hydrophilic properties for arsenate removal from water
Terms and conditions of current drinking water quality standards, including reducing the maximum arsenic concentration from 50 μgl-1 to 10 μgl-1 and predicted stricter standards in future, reveals the necessity for development of new technologies. This study aimed to prepare and evaluate a new nanocomposite membrane using graphene oxide (GO) thin layer to remove arsenic (v) from water. To fabri...
[ 6 ] - Simultaneous nitrification-denitrification in a sequencing batch reactor equipped with fixed Kaldnes carriers
The main aim of this study was to evaluate the performance of a modified sequencing batch reactor (MSBR) using fixed Kaldnes carriers fed with acclimated sludge for ammonium removal via simultaneous nitrification-denitrification (SND) in synthetic wastewater. The results exhibited a SND of 82.3% within a 450-minute cycle time which was higher than that of a SBR without carrier (69.83%). Nitrite...
[ 7 ] - Application of experimental design approach for optimization of the photocatalytic degradation of humic substances in aqueous solution using immobilized ZnO nanoparticles
Degradation of humic substances in water is important due to its adverse effects on the environment and human health. The aim of this study was modeling and investigating the degradation of humic substances in water using immobilized ZnO as a catalyst. ZnO nanoparticles were synthesized through simple coprecipitation (CPT) method and immobilized on glass plates. The immobilized ZnO nanocatalyst...
[ 8 ] - Photocatalytic removal of Acid Red 88 dye using zinc oxide nanoparticles fixed on glass plates
In this study, ZnO nanoparticles fixed on glass plates were employed as photocatalysts for the degradation of Acid Red 88 (AR88) dye in aquatic solution. ZnO nanoparticles were synthesized through coprecipitation method and fixed on glass plates. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used for characterization of nanoparticle samples. A batch reactor equi...
[ 9 ] - Photocatalytic degradation of methylene blue dye over immobilized ZnO nanoparticles: Optimization of calcination conditions
In the present study, calcination conditions during the synthesis of zinc oxide nanoparticles were optimized using response surface methodology (RSM) based on central composite design (CCD). After that, the effect of the type of UV irradiation on the photocatalysis of methylene blue (MB) dye was studied based on the kinetic model obtained at optimum conditions. Analysis of variance (ANOVA) exhi...
[ 10 ] - Increasing of leachate quality using an integrated aerobic membrane bioreactor
The aim of this study was the increasing of leachate quality using integrated membrane bioreactor (MBR). The reactor was fed with treated leachate with overall 70-1360 mg/l chemical oxygen demand (COD). The analysis of COD, biochemical oxygen demand (BOD5), total suspended solids (TSS), and total dissolved solids (TDS) were performed in feed and filtrate, whenever the system reached steady stat...
[ 11 ] - ارزیابی آلودگی شیمیایی منابع آب زیر زمینی مناطق پایین دست محل دفن زباله شهر سنندج
چکیده زمینه و هدف: در جایگاههای دفن زباله، نشت و نفوذ شیرابه که حاوی ترکیبات و آلاینده‌های گوناگون می‌باشد، باعث آلودگی آبهای زیر زمینی گردیده و مسائل بهداشتی و زیست محیطی عدیده‌ای را ایجاد می‌نماید. هدف از این تحقیق ارزیابی آلودگی شیمیایی منابع آب زیر زمینـی مناطق پایین دست محل دفن زباله شهر سنندج می‌باشد. روش بررسی: در این مطالعه 5 حلقه چاه در مجاورت لندفیل انتخاب گردید، و پس از 6 مرحله نمو...
[ 12 ] - Studying the Efficiency of XAD-7HP Anionic Resin in the Extraction of Humic Acid from Surface Water
Introduction: Humic substances (HSs) are very complex and heterogeneous organic matter with high molecular weight and various functional groups, which are produced from the chemical and biological degradation of plants and animal tissues. HS can cause: colour, odour and taste problems in drinking water, biological growth in distribution systems, increase in chlorine demand for disinfection, mem...
[ 13 ] - کاربرد نانوپودر سیلیکای تثبیت شده در آلژینات برای جذب کادمیم از محلول‌های آبی
هدف از این پژوهش، مطالعه جذب سطحی کادمیم بر روی نانوپودر سیلیکای تثبیت شده در آلژینات کلسیم و تعیین ایزوترم، سینتیک و ترمودینامیک جذب بود. از راکتورهای جریان ناپیوسته برای بررسی تأثیر pH اولیه، زمان تماس و غلظت یون‌های فلزی بر جذب کادمیم استفاده شد. زمان تماس و pH اولیه مطلوب برای جذب سطحی کادمیم به‌ترتیب 120 دقیقه و 4 به‌دست آمد. با افزایش غلظت یون کادمیم از 10 به 1000 میلی‌گرم در لیتر، میزان ...
[ 14 ] - Determination of malachite green and leucomalachite green residues in rainbow trout in Sanandaj City
Background and Aim: Malachite green (MG) is an organic compound which his used as a dye in textile industry. This compound is applied incorrectly and illegally in aquiculture as an antimicrobial agent. This compound has mutagenic and carcinogenic effects. Materials and Methods: In this study we determined the concentrations of MG and leucomalachite green (LMG) in the muscle tissue of 90 rainbow...
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