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Ammonia Removal in Free-Surface Constructed Wetlands Employing Synthetic Floating Islands: Employing synthetic floating islands
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Free water surface constructed wetlands (FSCWs) can be used to complement conventional waste water treatment but removal efficiencies are often limited by a high ratio of water volume to biofilm surface area (i.e. high water depth). Floating treatment wetlands (FTWs) consist of floating matrices which can enhance the surface area available for the development of fixed microbial biofilms and provide a platform for plant growth (which can remove pollutants by uptake).  In this study the potential of FTWs for ammoniacal nitrogen (AN) removal was evaluated using experimental mesocosms operated under steady-state flow conditions with ten different treatments (two water depths, two levels of FTW mat coverage, two different plant densities and a control, all replicated three times). A simple model was constructed as a framework for understanding N dynamics in each treatment.  The model was calibrated using data obtained from one treatment and validated independently for the other treatments. Specifically, we hypothesized that the nitrification and volatilization rate constants are inversely proportional to water depth and proportional to mat surface area. This allowed the relative magnitude of different removal mechanisms to be estimated.  The model was able to predict steady-state concentrations of AN and total oxidized nitrogen (TON) across the different treatments well (values for correlation in the regression between measured and predicted steady-state concentrations and RMSE were 0.88 and 0.40 mg N L-1 for AN, and 0.63 and 1.75 mg N L-1 for TON).  The results confirm that nitrification is the principal AN removal process, with maximum removal occurring in shallow systems with high matrix cover (i.e. a high ratio of biofilm surface area to water volume). Plant uptake was a relatively minor loss process compared to nitrification. Integrated experimental and model-based approach was found to be a useful tool to improve mechanistic understanding AN dynamics in FSCWs and system performance.

 

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Publication Date
Thu Jan 01 2015
Journal Name
Political Sciences Journal
US-Iranian relations under President Obama
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تنتاب العلاقةَ الأمريكية الإيرانية تجاذباتٌ ومشاحنات أدخلت العالم في حالة من الغموض السياسي، وجعلت بعض المراقبين والمحللين السياسيين لا يستبعدون توجيه الولايات المتحدة الأمريكية أو إسرائيل ضربة عسكرية لإيران، إذ يرى المدقق في واقع تلك العلاقة المضطربة: أن الأمور كلما بلغت حافة الهاوية عادت من جديد إلى ساحة الحوار والمفاوضات، ويبدو: أن الإستراتيجية الأمريكية التي يتبعها الرئيس (باراك أو

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Publication Date
Sat Mar 18 2023
Journal Name
المجلة العلمية للتكنولوجيا وعلوم الاعاقة
دور التلفزيون في تربية وتعليم النشىء وتثقيفه
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جاءت هذه الورقة البحثية لتبين اهمية التلفزيون في حياة النشىء من حيث بناء شخصيته واكسابه مايلزم من المهارات التي تعدهم الاعداد الافضل للحياة في حاضرها ومستقبلها ولتظهر دوره كوسيلة تعليمية معينة يمكن الاستفادة منها في العملية التربويةفي البيت والروضة والمدرسة ولتواكب مراحل حياة الاطفال وخصائص النمو العقلي والجسمي والانفعالي في كل مرحلة

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Publication Date
Tue Jan 08 2019
Journal Name
Arab Science Heritage Journal
عناصر دار الإسلام في صدرالإسلام وخلافة الأمويين
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يتكون العالم ، أنذاك ، من دارين  - دار الإسلام حيث الأقاليم الإسلامية ودار الحربوهي بلاد المشركين الذين لا صلح بينهم وبين المسلمين (1) ، أي ما خضع للعدو ضمن حدود سيادته ،  ولكن عندما يحتفظ أهالي البلاد المفتوحة صلحاً بحقوق ملكية الأرض فأنه ،على رأي الماوردي ، يصبح خراجهم جزية ولا جزية على رؤوسهم(2) ولهم حرية تبايع أرضهم فيما بينهم أو بيعها للمسلمين أو لأهل الذمة (3)  . ولا يمكن أن تعد أرضهم

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Publication Date
Fri Oct 28 2022
Journal Name
Political Sciences Journal
جدلية الحرية والقانون في فكر فردريك هيجل
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Western political philosophy is one of the philosophies that dealt with many ideas and proposals that include concepts born in ancient times, where Greek philosophy represents the basic roots of the development of political thought and the study of political phenomena and a starting point for political thought, and if the matter is completed with the Romans, and schools of thought that represented a model for building the state And up to the modern era, the absolute and the relative were the subject of discussion by most philosophers, the transition of thought was with Descartes, and the intellectual transformation from the absolute to the relative was with Nietzsche, and the basic root of all of that is represented by the German philoso

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Publication Date
Sun Dec 02 2007
Journal Name
Political Sciences Journal
اشكالية النظرية في العلوم السياسية : مساهمة اولية
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اشكالية النظرية في العلوم السياسية : مساهمة اولية

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Publication Date
Wed Feb 05 2020
Journal Name
Political Sciences Journal
The Future of Palestinian identity under occupation and resistance
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Summary

The conflict between Arab and Zionist movement before 1948 was not normal dispute about certain issue or quarrel on borders, it is comprehensive conflict, this research intraduce analytical and outlook future reading about Palestine identity in time of occupation and resistance in the first studying we take the concept of identity and the fundamental relationship identity history and geography. Our research treated the contents of palest Iain and Isralian identsunder. The political, cultural and military conflict between Israil and Palestine. The research introduce analytic study of research introduce analytic study of intellectual orientation of Zionist state in order to determine the exact meaning of this identity, beca

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Publication Date
Wed May 21 2025
Journal Name
القبة البيضاء
دور المراكز البحثية في دعم القضايا الأجتماعية
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تناول هذا البحث الدور الحيوي الذي تؤديه المراكز البحثية في دعم القضايا الاجتماعية، مع التركيز على مركز دراسات المرأة في جامعة بغداد كنموذج تطبيقي. يوضح الباحث أن هذه المراكز لا تقتصر على إنتاج المعرفة النظرية، بل تسهم بشكل مباشر في معالجة التحديات المجتمعية، من خلال تقديم رؤى تحليلية ومقترحات عملية لصناع القرار. كما ويسلط الضوء على مساهمة مركز دراسات المرأة في تعزيز المشاركة السياسية للمرأة العراقية، خاصة

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Publication Date
Mon Nov 19 2018
Journal Name
Arab Science Heritage Journal
المفاضلة المفاضلة بين الرجل والمرأة في الإسلام
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            Humans have considerations of gender male and female, and many of them have preferential male versus female, and became such considerations solid in the minds of some of the intellectuals, public and most of the people; as a fact for granted, and that's what get them to prefer of boys over females.

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Publication Date
Thu Jul 29 2021
Journal Name
Arab Science Heritage Journal
هاشم الخطاط وجهوده في الخط العربي الاسلامي
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 The line is among a nation of civilized nations did not attain what Muslims took care

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Publication Date
Wed Dec 19 2018
Journal Name
Arab Science Heritage Journal
تاريخ تار يخ الزلازل في بلاد الشام
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Affected by agricultural products in the Levant to a lot of factors that led to the rise in prices which as a result of natural factors, the most important and most notably the earthquakes that occurred in the dates of sporadic in the Levant,

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