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Article
Membranes Separation Process For Oily Wastewater Treatment
عملية الفصل بالأغشيةِ لمعالجة المياه الملوثة بالزيوت

Authors: Zaid Waadulla Rashad --- Maha H. Al-Hassani --- Ahmed Faiq Al-Alawy --- Hasan Ferhood Makki
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2011 Volume: 17 Issue: 2 Pages: 235-251
Publisher: Baghdad University جامعة بغداد

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Abstract

Pilot-scale dead end microfiltration membranes were carried out to determine the feasibility of the process for treating the oily wastewater which discharge from some Iraqi factories such as power station of south of Baghdad and the general company of petrochemical industries. Polypropylene membranes (cylindrical shape) with different pore diameters (1 and 5 micron) were used to conduct the study on micromembrane process. The variables studied are oil concentration (100 – 1000 ppm), feed flow rate (20 – 40 l/h), operating temperature (31 – 50°C) and time (0 – 3 h). It was found that the flux increases with increasing feed flow rate, temperature and pore size of membrane, and decreases with increasing oil concentration and operating time. It was found also that the effect of feed oil concentration has the greatest effect on the fouling of membrane among other variables. The percent rejection of oil improved significantly with decreasing oil concentration but decreased with increasing feed temperature, pore size of membrane and operating time. Feed flow rate has slightly effect on oil rejection. The type of oil used in this work is 20W-50 gasoline and diesel engine oil.A general model of dead end filtration mode has been successfully evaluated to explain fundamental mechanisms involved in flux decline during dead end microfiltration of oily water emulsions. Analysis of the fall in flux with time for the polypropylene membrane (5 μm) indicates that intermediate and standard pore models give the best prediction for experimental behavior. Empirical correlations for the prediction of the flux and percent reject of oil were determined in this study. These equations have the correlation coefficient 98.87% and 91.49% respectively.

اغشية المايكرو فلتر ذو النهاية المسدودة بمنظومة ريادية نفذت لتحديد دراسة لعملية معالجة المياه الملوثة بالزيوت التي تطرح من بعض المصانع العراقية مثل محطة كهرباء جنوب بغداد والشركة العامة للصناعات البتروكيمياوية. اغشية البولي بروبلين باقطار مختلفة (1 و 5 مايكرون) تم استخدامها لاجراء الدراسة على عملية غشاء المايكرو. المتغيرات التي تم دراستها هي تركيز الزيت (100 – 1000 جزء بالمليون) , معدل الجريان (20 – 40 لتر/ساعة) , درجة حرارة التشغيل (31 – 50 م°) والزمن (0 – 3 ساعة). لقد وجد بأن معدل التدفق يزداد بزيادة معدل الجريان للقيم (المغذي) , درجة الحرارة وحجم المسام للغشاء , ويقل بزيادة تركيز الزيت وزمن التشغيل. وكذلك وجد بأن تركيز الزيت ذو تأثير اكبر على تلوث الغشاء من بين المتغيرات الاخرى. نسبة الرفض للزيت تتحسن بشكل ملحوظ بنقصان تركيز الزيت الداخل ولكن تقل بزيادة درجة حرارة اللقيم (المغذي) , حجم المسام للغشاء وزمن التشغيل. معدل جريان اللقيم (المغذي) له تأثير قليل على نسبة رفض الزيت. ان نوع الزيت المستخدم في هذا العمل هو20W-50 زيت محرك الديزل والكازولين. نموذج عام من نمط ترشيح النهاية المسدودة قُيم بنجاح لتوضيح اليات اساسية تستخدم في هبوط الجريان خلال المايكرو فلتر ذو النهاية المسدودة لمستحلبات الماء الزيتية. تحليل الهبوط في الجريان مع الزمن لغشاء البولي بروبلين (5 مايكرون) يوضح بأن نماذج المسام المتوسطة والقياسية تعطي افضل تنبؤ للسلوك التجريبي. معادلات الارتباط التجريبية لحساب الجريان ونسبة الرفض للزيت تم تحديدها في هذه الدراسة. هذه المعادلات لها معامل الارتباط 98.87% و 91.49% على التوالي


Article
Microfiltration Membranes for Separating Oil / Water Emulsion

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Abstract

This research was aimed to study the efficiency of microfiltration membranes for the treatment of oily wastewater and the factors affecting the performance of the microfiltration membranes experimental work were includes operating the microfiltration process using polypropylene membrane (1 micron) and ceramic membrane (0.5 micron) constructed as candle; two methods of operation were examined: dead end and cross flow. The oil emulsion was prepared using two types of oils: vegetable oil and motor oil (classic oil 20W-50). The operating parameters studied are: feed oil concentration 50 – 800 mg/l, feed flow rate 10 – 40 l/h, and temperature 30 – 50 oC, for dead end and cross flow microfiltration. It was found that water flux decreases with increasing operating time and feed oil concentration and increases with increasing operating temperature, feed flow rate and pore size of membrane. Also, it was found that rejection percentage of oil increases with increasing flow rate and rejection percentage decreases with increasing time, feed oil concentration, feed temperature and pore size of membrane for dead end and cross flow microfiltration. In cross flow microfiltration, reject concentration (concentrate) increases with increasing flow rate, feed concentration, time and feed temperature. The dead end filter has more flux compared to cross flow filter, while, in cross flow the oil rejection percentage is best than dead end. Flux for vegetable oil is more than motor oil but rejection percentage for vegetable oil is less than that for motor oil. The highest recovery ratio was found is 44.8% for cross flow process with recirculation of concentrating stream to feed vessel. The highest rejection percentage of oil was found is 98 % and 97.8 % for cross flow and dead ends respectively.


Article
Removal of Methyl Violet Dye From Synthetic Wastewater Using a Hybrid Detoxification Process
تنقية المياه من صبغة المثيل البنفسجية باستخدام الطريقة الهجينة لازالة السمية

Authors: Mohammad F. Abid --- Amir A, Abdul-Rahman --- Noor H. Hamza
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 6 Part (A) Engineering Pages: 1544-1561
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The aim of the present study was to design a solar reactor and analyze its performance for removal of methyl violet dye (MV) from water with titanium dioxide as the photocatalyst. The solar reactor was made up of a flat-plate colorless glass of dimensions 1000 x 750 x 4 mm. The base of the reactor was made of aluminum. Various operating parameters were studied to investigate the behavior of the designed reactor like initial dye concentration (CMV=10-50 mg/L), loading of catalyst (CTiO2=200-800 mg/L), suspension flow rate (QL=0.3-2 L/min), pH of suspension (5-10), and H2O2 concentration (CH2O2=200-1000 mg/L). The operating parameters were optimized to give higher efficiency to the reactor performance. The designed reactor when operating at optimum conditions offered a degradation of MV up to 95.27% within one hours of operation time, while a conversion of 99.95% was obtained in three hours. The effluent from the photocatalytic reactor was fed to a LPRO separation system which produced a permeat of turbidity value of 0.09NTU. The product water was analyized using UV-spectrophotometer and FTIR. The analysis results confirmed that the water from the Hybrid-system could be safely recycled and reuse. It was found that the kinetics of dye degradation was first order with respect to dye concentration and could be well described by Langmuir-Hinshelwood model.

يهدف البحث الى دراسة كفاءة مفاعل الطبقة الساقطة في ازالة صبغة المثيل البنفسجية من المياه باستخدام ضوء الشمس وثاني اوكسيد التيتانيوم كعامل مساعد. ثم بحث تأثير المتغيرات التشغيلية (تركيز الصبغة, تركيز العامل المساعد, معدل تدفق السائل, حامضية المحلول, تركيز بيروكسيد الهيدروجين) على كفاءة اداء المفاعل في ازالة الصبغة. بعد ايجاد افضل الظروف التشغيلية التي تؤدي الى اعلى كفاءة للمفاعل وقد وجد ان المفاعل يحقق ازالة بمقدار95.27% بعد ساعة من التشغيل و99.95% بعد ثلاث ساعات من التشغيل. ثم دراسة حركية التفاعل للتفاعل الضوئي ووجد ان قانون سرعة التفاعل من الدرجة الاولى بالنسبة لتركيز الصبغة وتطابق مع موديل Langmuir-Hinshelwood , كما وجدت علاقة تجريبية تربط بمعدل الازالة الصبغة مع المتغيرات التشغيلية.

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