البحث — المستودع الرقمي العراقي

المستخلص: يهدف البحث الى اجراء دراسة عملية لانتاج مسحوق النحاس باستعمال طريقة الترسيب الكهروكيمياوية مع دراسة تاثير عدد من المتغيرات التي تؤثر في كفاءة العملية والوقوف على طبيعة تاثير كل منها. تمت دراسة تاثير كل من كثافة التيار وزمن الترسيب ودرجة حرارة وسط الترسيب | The present study aims to produce copper powder by the electrochemical deposition method. In this work, the effect of current density, deposition period, electrolyte temperature, distance between electrodes, ratio of anode to cathode surface area and cathode rotation on the current efficiency and powder properties such as apparent density, grain size, grain size distribution and grain morphology on powder properties and current efficiency are studied. A deposition system composed of Perspex cell, two copper electrodes ( 96.8% purity), electrolyte composed of 90g/l CuSO4 and 120g/l H2SO4 as well as the electrical connections. Betts method was followed by this study.The automatic sieve shaker was used to determine the grain size, while the atomic spectroscopy was used to determine copper purity. Moreover, both optical microscope and SEM were used to estimate powder morphology. It is found that current efficiency is increased with increasing deposition time and electrolyte temperature. It is also found to be decreased with increasing current density, distance between the electrodes, ratio of anode to cathode surface area and rotation of cathode electrode. The results showed also that particle size is increased with increasing the distance between the electrodes and increased with increasing the ratio of anode to cathode surface area and cathode rotation. Further more, the obtained data indicated that the maximum and minimum achieved fine grain percent (

دراسة استخدام الكاربون المنشط الحبيبي لازالة الفينول والباراكلوروفينول والبنزين من المياه المطروحة من مصفى بيجي == Study of Using Granular Activated Carbon for Removing Phenol , Parachlorophenol , And Benzene From Wastewater of Baiji Refinery

اسم المؤلف: ابتسام احمد جدوع القيسي

اسم المشرف: مزهر مهدي ابراهيم الدوري

الموضوع العام: الهندسة الكيمياوية

السنة: 2010

الموضوع الدقيق: الهندسة الكيمياوية

الدرجة: ماجستير

الجامعة: جامعة تكريت - كلية الهندسة - قسم الهندسة الكيمياوية

اللغة: العربية

مكان الجامعة: صلاح الدين

الصفحات الاولى:

المستخلص: ان هدف الدراسة الحالية هو ازالة البنزين والفينول والباراكلوروفينول من مياه الصرف الصناعية في مصفى بيجي بعملية الامتزاز بواسطة الكاربون المنشط الحبيبي وامكانية تمثيل العملية بنموذج رياضي.وقد صمم وصنع جهاز مختبري لغرض انجاز الدراسة اخذين بالاعتبار امكاني | The aim of the present study is to remove phenol, parachlorophenol and Benzene from waste water of Baiji refinery by using granular activated carbon. Moreover using the present models to represents the experimental data.A Laboratory scale apparatus is designed and constructed taking into account the most important parameters effecting adsorption. In performing the present study Actual wastewater of Baiji refinery is taken to perform the experimental work.The results indicated that phenol, parachlorophenol and Benzene can be removed completely using granular activated carbon. Also the results indicated that breakthrough and exhaustion time are inversely proportional with the concentration of pollutants and liquid hourly space velocity, while they are directly proportional with the thickness of granular activated carbon. Its found that the Adsorption capacity is directly proportional with the concentration of pollutants and liquid hourly space velocity. The results of this work indicated also the thickness of adsorption zone, which is calculated depending on the result of this study, is directly proportional with liquid hourly space velocity.Application of the most famous available models that are used to represent adsorption phenomena on our experimental data show that only Freundlich model gives excellent agreement.In order to find mathematical model for breakthrough and exhaustion time as a function the most important parameters, an advanced computer program is used.We found two mathematical model for breakthrough and exhaustion time as a function of granular activated carbon thickness, liquid hourly space velocity and the concentration of pollutants. These two models give acceptable agreement with the experimental results.The adsorption capacity for the three pollutants are calculated and found to be directly proportional with liquid hourly space velocity and pollutants concentration.