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Article
A Study on Using Fluidized Bed Reactor for Treating Sanitary Sewage

Authors: Kifah M. Khudhair --- Mudhar H. Gatea
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2016 Volume: 16 Issue: 2 Pages: 1-10
Publisher: Basrah University جامعة البصرة

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Abstract

Fluidized bed reactor (FBR) is an attached growththe system used mainly for biological treatment of industrialwastewater of high organic content. These wastewaters areusually resulted from refineries and milk, starch, and olive oilindustries. The objective of this study is to investigate the use offluidized bed reactor for treating sanitary sewage. The study wasaccomplished using a pilot plant of the FBR. The pilot plant wasconstructed and installed in Hamdan Sewage Treatment Plant inBasrah governorate. That was to maintain continuous source ofsettled sewage which is the influent to the FBR. The period ofplant operation was nine weeks. During, this period, the plantwas operated at three phases of different conditions (up the flowvelocity and recirculation ratio). To study the performance ofFBR, the main measured parameters were; BOD, DO, VSS, pH,and temperature. The most important conclusions of this studyare; (1) the maximum efficiency of BOD removal is 78.6% whichwas obtained for hydraulic retention time (HRT) of 24min andupflow velocity of 1.59m/min, (2) the effluent BOD values duringphases-1 and 2 of plant operation match that of stabilizationponds and trickling filters and during phase-3 matches thatactivated sludge process, (3) during all operation phases, thevalues of effluent pH are within the limits specified in nationalstandards of secondary effluents, (4) as F/M increases, theefficiency of BOD removal decreases and the maximumthe efficiency of BOD removal (78.6%) was obtained at F/M ratioequals 23.47 day-1, and (5) the HRT of fluidized bed reactor is onorder of minutes, while, the values of HRT of activated sludgesystems and stabilization ponds are on the order of hours and days,respectively


Article
Treatment of Oily Wastewater Produced From Old Processing Plant of North Oil Company
معالجة المخلفات النفطية الناتجة من وحدة التركيز القديم لشركة نفط الشمال

Author: Dr. Faris Hammoodi Al-Ani
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2012 Volume: 19 Issue: 1 Pages: 23-34
Publisher: Tikrit University جامعة تكريت

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Abstract

The main objectives of this research were to study and analyses oily wastewater characteristics originating from old-processing plant of North Oil Company and to find a suitable and simple method to treat the waste so it can be disposed off safely. The work consists of two stages; the first was the study of oily wastewater characteristics and its negative impacts. The results indicated that oil and grease were the most dominant pollutant with concentration range between 1069 – 3269.3 mg/l that must be removed; other pollutants were found to be within Iraqi and EPA standards. The next stage was the use of these characteristics to choose the proper technology to treat that wastewater. This stage was divided into two stages: the first stage was a jar tests to find the optimum doses of alum, lime and powdered activated carbon (PAC). The second stage was the treatment by a batch pilot plant constructed for this purpose employing the optimum doses as determined from the first stage to treat the waste using a flotation unit followed by a filtration-adsorption unit. The removal efficiencies of flotation unit for oil and grease, COD, and T.S.S found to be 0.9789, 0.974, and 0.9933, respectively, while the removal efficiency for T.D.S was very low 0.0293. From filtration – adsorption column the removal efficiencies of oil and grease, T.D.S, COD, and T.S.S were found to be 0.9486, 0.8908, 0.6870, and 0.7815, respectively. The overall removal efficiencies of pilot plant were 0.9986, 0.8939, 0.9921, and 0.9950, respectively. The results indicated that this type of treatment was the simplest and most effective method that can be used to treat produced oily wastewater before disposal.

الهدف من البحث هو دراسة خواص المخلفات النفطية ومحاولة ايجاد طريقة مناسبة وسهلة لمعالجتها والوصول بها الى حد مقبول للطرح. تضمن البحث مرحلتين , الأولى هي دراسة خواص للمخلفات النفطية ، حيث بينت النتائج إن هناك زيادة في تراكيز بعض العناصر وخاصة الدهون والزيوت. المرحلة الثانية انقسمت إلى قسمين, الأول تضمن أجراء فحوصات الجرة لإيجاد الجرعة المثالية الشب,الجير,ومسحوق الكاربون المنشط. أما الثاني فهو تصميم وإنشاء محطة بحثية تألفت من وحدتي معالجة رئيسيتين هي التطويف و الترشيح –الامتزاز. بينت النتائج ان لعملية التطويف القابلية العالية لإزالة الدهون والزيوت ,COD ,T.S.S وبمعدل ازالة 0.9789, 0.9740, و0.9933, على التوالي. أما عملية الترشيح - الامتزاز فكانت نسبة إزالة جميع المواد عالية جدا بمعدل إزالة 0.9486, 0.8908, 0.6870, و0.7815 للدهون والزيوت, T.D.S, COD,و T.S.S على التوالي. وكان معدل الإزالة الكلية 0.9986, 0.8939, 0.9921, و0.9950 على التوالي.


Article
Radiological Impact of Geo-Pilot Plant after Decontamination
المترتبات الاشعاعية لمنشأةالمسح الجيولوجي بعد ازالة التلوث الاشعاعي

Authors: Dr.Yousif M. Zayir Al-Bakhat --- Fouzey H. kitah
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467 Year: 2012 Volume: 18 Issue: 74 / ملحق Pages: 89-95
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The Geo-Pilot plant had been designed and constructed in 1989 in the center of Baghdad at high population residence sector to protect the hydrated yellow cake from uranium Ore. The final radiological survey is performed on the Geo-Pilot Plant to demonstrate compliance with the appropriate release criteria. The field measurements were performed on a systematic grid of 404 cells. The samples of soil were collected and analyzed in the radioanalytical laboratory. The results of laboratory analysis satisfy the exclusion criteria established by the International Atomic Energy Agency(IAEA). The dose received by the decommissioning workers range from 0.25 – 0.42 µSv /y, which satisfy the occupational dose limit regulated by the IAEA of 20 mSv/y and 1mSv/y for public. The environmental impact of the use of the site for industrial scenario has been investigated using RESRAD computer code. The results indicate that the Geo-Pilot Plant meets the release criteria after dismantling, since none of the individual measurements or health risk assessment results exceed any of the established guidelines.

تم تصميم وبناء منشأة المسح الجيولوجي في عام 1989في مركز بغداد ذات الكثافة السكانية العالية وصممت لانتاج الكعكه الصفراء من اليورانيوم المستخرج من المنجم التابع لوزارة الصناعة والمعادن. تم اجراء مسح اشعاعي نهائي باستخدام الاجهزة الحقلية ضمن مخطط شبكي يتكون من 404 خلية لتحديد مستوى التلوث والتعرض الاشعاعي للمنشاة بعد التفكيك وازالة التلوث الاشعاعي للمناطق الملوثة، اضافة الى قياس وتحليل نماذج التربة باستخدام المنظومات المختبرية الثابتة وكانت النتائج مطابقة مع المحددات العالمية لاطلاق لمنشآت والمحددة من قبل الوكالة الدولية للطاقة الذرية.-ان معدل الجرع المستلمة من قبل العاملين تتراوح بين( 0.25-0.42 ) مايكرو سيفرت / سنة وهي أقل من الحدود المسوح بها للعاملين والمحددة من الوكالة الدولية للطاقة الذرية والبالغة ( 20 ) ملي سيفرت/سنة و (1 ) ملي سيفرت/ سنة للسكان.-ان المترتبات الاشعاعية البيئية للمنشأة تم تحليلها باستخدام البرنامج العالمي RESRAD اشارت نتائج التحليل والتقييم للمخاطر الصحية للسكان اقل من الحدود المسموح بها وعليه تم اطلاق المنشاة للاستخدامات الصناعية .الكلمات الدالة/ اطلاق الموقع ، منشأة المسح الجيولوجي ، ظاهرة الاطلاق ، برنامجRESRAD

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