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Register a new userTreatment of Nitrate Contaminated Groundwater in Fluidized bed Reactor
معالجة المياه الجوفية الملوثة بشوارد النترات في مفاعل السرير المميع
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Damascus University ورقة بحثية
Publication date
2008
fields
Environmental Engineering
and research's language is
العربية
Created by
Shamra Editor
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تشكل إزالة النترات بالطريقة البيولوجية في مفاعل السرير المميع منقوص الأوكسجين طريقة بسيطة للتخلص مما يلوث المياه الجوفية من نتروجين النترات. يتم في هذا المفاعل تنمية غشاء بيولوجي على حبيبات سرير المفاعل و التي تم اختيارها في هذا البحث حبيبات الكربون المنشط ذات الأقطار (1-3) ملم، و يتكون هذا الغشاء البيولوجي في قسمه الأعظم من بكتريا عضوية التغذية و يمرر تيار الماء الخام المحمل بشوارد النترات مع ما يضاف إلى هذا الماء من مغذيات للبكتريا و التي اختيرت في بحثنا هذا الإيتانول و فوسفات الصوديوم ثنائية الهدروجين، الأول كمغذ كربوني و الثاني كمغذ فوسفوري. يتم مرور الماء الخام من أسفل المفاعل بسرعة كافية لتمييع حبيبات هذا السرير الحاملة للغشاء البيولوجي.
Biological Denitrification process in anoxic fluidized bed reactor is a simple way to eliminate nitrate – nitrogen that pollute the groundwater. In this method the biofilm (including organic bacteria) was cultured on the reactor bed particles, which we chose granular activated carbon (1-3) mm. The raw water containing Nitrate ions and bacteria nutrients was pumped into the bottom of the reactor in an adequate velocity to fluidize the bed particles holding the biofilm. Ethanol and DeHydrogenated Sodium ortho phosphate was chosen as bacteria nutrients, Ethanol as carbonic nutrient and DeHydrogenated Sodium ortho phosphate as phosphoric nutrient.
References used
M.Mc Casland et al, 2005 – Nitrate: Health Effects in Drinking Water
P.D. Robillard et al, 2006 - Nitrate in Drinking Water. Agricultural and Biological Engineering Department USA
Mimesoto Department of Agriculture USA 2006 – Drinking Water Protection Series; Nitrote Contamination – What is the Cost
rate research
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A simple description of the thin film fixed bed reactor (TFFBR) is
given. The work has applied different methods of sedimentation of the
solar catalyst suspension, including a new development of the method
being used to meaure the fixation index a
s well as, the study of the
temperature and mechanicaly - treated surface effects.
The results of original waste water (taken from Barada river -
Damascus) treatment, and a model waste water (with DCAA) treatment,
Using the TFFBR , under SYRIAN climatic conditions, were discussed
too .
The contamination of groundwater with nitrates is a common problem in many countries of
the world, especially the agricultural ones where the pollution originates in these countries
mainly from the use of excessive fertilization in agricultural are
as, industrial waste,
sewage, animal dung, and the "installation of air nitrogen by plants, the nitrogen
compounds that arise due to some industries and vehicle emissions which are deposited on
the ground in solids.
The nitrate compounds are carcinogens and hazardous to human health If they were in
high concentrations. The risk of this turning into nitrite nitrate uptake by the bacteria,
especially in the abdomen which in turn causes what is known as Balmithmoglubenemea
in infants and pregnant women (Infant disease blueness). It can also cause stomach cancer
in adults through its interaction with amines and amides in the abdomen, forming
carcinogens (Alntrozzomedat and Alentrzoaminat). Therefore, you must apply the
foundations of the integrated management of groundwater in the study area to maintain
low levels of nitrate in groundwater used for drinking and irrigation.
The purpose of this research is to apply a mathematical program to
calculate water and chemical balance in unsaturated soils, under the
influence of different methods of irrigation, in order to monitor the
amount of vertical drainage of water insi
de the soil and choose a
irrigation method that can reduce the phenomenon of groundwater
pollution.
Three irrigation methods were tested with different fertilization
method. The study was conducted in the western part of Homs
Governorate (AlQusair orchards).
Groundwater is one of the major sources of exploitation in arid and semi-arid
regions, Thus for protecting groundwater quality, data on spatial and temporal distribution
are important. Geostatistics methods are one of the most advanced techniques f
or
interpolation of groundwater quality. In this research, IDW, Kriging methods were used for
predicting spatial distribution of nitrate NO3
-. Data were taken from 21 wells study within
eastern Damascus's Ghouta.
After normalization of data, variograme was drawn. The less RSS was used, so
Spherical model was the best. By using cross-validation and RMSE, the best method for
interpolation was selected; Results showed that Kriging method is superior to IDW
method.
there is a big spatial dependence for nitrate variable that amounts to 2.2 %. Finally,
maps of distribution of nitrate in groundwater were executed by Kriging method, in
addition to executed maps that show goodness of groundwater for drinking and irrigation.
Then it was prepared map of Probability Map of nitrate at threshold 50 mg/l.
The provision of adequate drainage and the accompanying problem of
accumulation of salt in soil have plagued irrigated agriculture for
centuries. Soil salinity is one of the major problems in arid and semi-arid
zones. In Euphrates valley the high
groundwater level and its high
evaporation rate caused a serious salinity problem. This study was aimed
to allocate the dangerous areas in terms of high water level resulted from
the recent and expected activities. Drainage wells will be drilled at these
areas in order to lower the groundwater level and prevent further soil
salinity.
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