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Article
Removal of Cr (VI) and Cu (II) Ions from Synthetic Wastewater by Solar Photocatalytic Reactor

Authors: Mohammad F. Abid --- Luma H. Mahmood --- Noor H. Hamza --- Sukaine J. Mohamed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 4 Part (A) Engineering Pages: 417-423
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Heavy metal ions in wastewater have promoted increasing concern on environmental and health risks. The present work was devoted to investigate the feasibility of utilizing solar light to degrade Cr (VI) and Cu (II) ions in synthetic wastewater. The effect of the key process parameters on the quality of product was studied by varying the pH (3, 5, 7, 9, and 11), H2O2 (50, 100, 200, and 300 mg/L) and TiO2 loading (0.9, 1.3, and 1.7 g/L). Experimental results revealed that after 120 min of solar illumination the highest reduction of Cr (VI) ions was 97.0% obtained under (pH = 3, catalyst loading = 1.3 g TiO2/L, and H2O2 =100 mg/L) and for Cu (II) ions the highest reduction was 97.7% at (pH = 11, catalyst loading = 1.3 g TiO2/L, and H2O2 =200 mg/L). Empirical correlations were suggested for the photoreduction of Cr (VI) and Cu (II) ions as functions of the studied operating parameters with correlation coefficients of 0.946 and 0.948, 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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