باحثون علميون بجامعة الاسكندرية يتوصلون لتكنولوجيا جديدة لتحلية مياه البحر والصرف

[أبو محمد]

توصل باحثون في وحدة بحوث المياه بجامعة الاسكندرية لتكنولوجبا سهلة غير مكلفة

والاهم انها لاتحتاج لطاقة كهربائية

لتحويل مياه البحر ومياه الصرف الصحي الي مياه صالحة للشرب

وذلك بمنظومة "فريق عمل" من أقسام :

* الهندسة الكيميائية بكلية الهندسة جامعة الاسكندرية

* البحث والتطوير R&D بالأكاديمية العربية للعلوم والتكنولوجيا

* والهندسة الزراعية وهندسة النظم الحيوية بكلية الزراعة جامعة الاسكندرية

 

الطريقة الجديدة تم تجربتها بنجاح فى المعمل

وتم نشرها فى دورية علوم وتكنولوجيا المياه Water science&Technology

وفي انتظار تجربتها علي نطاق صناعى

 

وفي حال اعتمادها علي نطاق تجاري ستحل اشكاليات كبري لمصر والعالم كله

طبعا ولا اي اهتمام من اعلام مصر .. ولا أى اندهاشة

مع ان مجلة الوعى العلمى الاسترالية Science Alert نشرت عنها من أسبوعين

 

فى رأيى أن عدم النشر عن هذه الأبحاث والمحاولات العلمية فى الإعلام المصرى هو قرار حكيم

ففريق المتربصين الناوين على إفشال أى بحث أو محاولة علمية إيديهم طايلة ولهم جمهور

[أبو محمد]

تحسبا لاختفاء المنشور عن التكنولوجيا الجديدة من الإنترنت لأى سبب

رأيت نقلها إلى "المحاورات" .. ديوان المصريين

 

 

Water Science & Technology Vol 72 No 5 pp 785–793 © IWA Publishing 2015

doi:10.2166/wst.2015.277

  Desalination of simulated seawater by purge-air pervaporation using an innovative fabricated membrane

Mona Naim, Mahmoud Elewa, Ahmed El-Shafei and Abeer Moneer

 

Chemical Engineering Department Faculty of Engineering, Alexandria University, Alexandria, Egypt
 

Research Development Department, Arab Academy for Science, Technology and Maritime Transport, Alexandria, Egypt
 

Agricultural and Biosystems Engineering, Faculty of Agriculture, Alexandria University, Alexandria, Egypt

E-mail: ahmed.elshafi@alexu.edu.eg
National Institute of Oceanography and Fisheries, Alexandria, Egypt

 

ABSTRACT

An innovative polymeric membrane has been invented, which presents a breakthrough in the field of desalination membranes. It can desalinate simulated seawater of exceptionally high concentration to produce a high flux of potable water with over 99.7% salt rejection (%SR) in a once-through purge-air pervaporation (PV) process. A set-up was constructed for conducting the desalination experiments and the effect of initial salt solution concentration (C_i) and pervaporation temperature (T_pv) on the water flux (J), %SR, separation factor, and pervaporation separation index were determined. The membrane was prepared by the phase-inversion technique, of a specially formulated casting solution consisting of five ingredients, after which the membrane was subjected to a post-treatment by which certain properties were conferred. The results confirmed that the salinity of the pervaporate was independent of C_i (all %SR above 99.7). The best result was at T_pv = 70 °C, where J varied from 5.97 to 3.45 l/m² h for C_i = 40–140 g NaCl/l, respectively. The membrane morphology was confirmed to be asymmetric. The contact angle was immeasurable, indicating the membrane to be super-hydrophilic. Activation energies computed using Arrhenius law were, under all conditions investigated, less than 20 kJ/mol K.

 

Keywords: activation energy; cellulose acetate; desalination; membranes; pervaporation

Full article (PDF Format)

 

eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00)

All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment

[أبو محمد]

 

This new technology converts sea water into drinking water in minutes

This could change a whole lot of lives.

DAVID NIELD

16 SEP 2015

61.k754

 

Purifying dirty water is a notoriously difficult and expensive process - even in California, financial pressures affect what can be done to tackle the severe drought in the area. Those in developing nations have far less money to play around with, which is why a newly invented and ultra-cheap water cleaning process is looking so promising.

 

Developed by a team of researchers at Alexandria University in Egypt, the procedure uses a desalination technique called pervaporation to remove the salt from sea water and make it drinkable. Specially made synthetic membranes are used to filter out large salt particles and impurities so they can be evaporated away, and then the rest is heated up, vapourised, and condensed back into clean water.

 

Crucially, the membranes can be made in any lab using cheap materials that are available locally, and the vaporisation part of the process doesn't require any electricity. This means the new method is both inexpensive and suitable for areas without a regular power supply - both factors that are very important for developing countries.

 

The technique not only desalinates the seawater, it's capable of removing sewage and dirt from it too. The researchers combined expertise in oceanography, chemical engineering, agricultural engineering and biosystems engineering to come up with the solution, and their work has now been published in the journal Water Science and Technology.

 

"The technology implemented in the study is much better than reverse osmosis, the technology currently used in Egypt and most of the countries in the Middle East and North Africa," Helmy El-Zanfaly, a professor of water contamination at Egypt’s National Research Centre, told Scidev.net. "It can effectively desalinate water with high concentration of salt like that of the Red Sea, where desalination costs more and yields less."

Unfortunately for those who are waiting for this type of technology, a lot of work is required before it can be put into action: the academics working on the project have to set up a pilot test that proves their theories correct on a large scale. There's also the issue of how to deal with the waste produced from the process.

 

What's certain is that a new procedure like this could have a huge impact on the lives of millions of people - according to Water.org, some 750 million people across the globe don't have access to clean drinking water, a problem that's responsible for around 840,000 deaths every year - more than the entire population of San Francisco.

[tarek hassan]

ما شاء الله 

أحسن خبر سمعته 

قدرة ربنا على إيصال رزق المياه إلى المصريين 

رغم الخطر المرعب في الفترة السابقة 

[أبو محمد]

 

ما شاء الله 

أحسن خبر سمعته 

قدرة ربنا على إيصال رزق المياه إلى المصريين 

رغم الخطر المرعب في الفترة السابقة 

 

 

كل شئ بأوانه يا أستاذ طارق

:)

حتى كفتة عبد العاطى

 

وَأَمَّا الْجِدَارُ فَكَانَ لِغُلَامَيْنِ يَتِيمَيْنِ فِي الْمَدِينَةِ

وَكَانَ تَحْتَهُ كَنزٌ لَّهُمَا وَكَانَ أَبُوهُمَا صَالِحاً

فَأَرَادَ رَبُّكَ أَنْ يَبْلُغَا أَشُدَّهُمَا وَيَسْتَخْرِجَا كَنزَهُمَا رَحْمَةً مِّن رَّبِّكَ

وَمَا فَعَلْتُهُ عَنْ أَمْرِي ذَلِكَ تَأْوِيلُ مَا لَمْ تَسْطِع عَّلَيْهِ صَبْراً

[tarek hassan]

 

كل شئ بأوانه يا أستاذ طارق

:)

حتى كفتة عبد العاطى

 

وَأَمَّا الْجِدَارُ فَكَانَ لِغُلَامَيْنِ يَتِيمَيْنِ فِي الْمَدِينَةِ

وَكَانَ تَحْتَهُ كَنزٌ لَّهُمَا وَكَانَ أَبُوهُمَا صَالِحاً

فَأَرَادَ رَبُّكَ أَنْ يَبْلُغَا أَشُدَّهُمَا وَيَسْتَخْرِجَا كَنزَهُمَا رَحْمَةً مِّن رَّبِّكَ

وَمَا فَعَلْتُهُ عَنْ أَمْرِي ذَلِكَ تَأْوِيلُ مَا لَمْ تَسْطِع عَّلَيْهِ صَبْراً

 

 

الله يفتح عليك يا أبو محمد

[Grandma]

في موضوع أخبارع السريع ذكرت ان الخبر دا كان أحد الأخبار اللي بنتظرها بفارغ الصبر لاني كنت متأكدة ان المصريين قادرين على ذلك وان هما اللي هيعملوها .

والدي أخد الماجستير بتاعته من جامعة اكسفورد وكان موضوعها  (تحلية مياه الصرف الصحي و تحويلها لمياه صالحة للشرب ) وبعد كدا عمل دراسات واشتغل في تنفيذ الموضوع دا في هولندا وهما فعلا دلوقتي بيستخدموا مياه الصرف الصحي في الشرب ومن فترة طويلة ... والدي خريج هندسة اسكندرية فكان لازم المهندسين الاسكندرانية هما اللي يعملوها . 

 

ودي بشرة خير تانية لمصر ويارب دايما علماءنا رافعين راسنا .