مجموعة تكنولاب البهاء جروب

تحاليل وتنقية ومعالجة المياه
 
الرئيسيةالبوابةمكتبة الصورس .و .جبحـثقائمة الاعضاءالمجموعاتالتسجيلدخول
تنظيف وتطهير وغسيل واعادة تاهيل الخزانات


معمل تكنولاب البهاء جروب
 للتحاليل الكيميائية والطبية
والتشخيص بالنظائر المشعة
 للمخدرات والهرمونات والسموم
 وتحاليل المياه

مجموعة
تكنولاب البهاء جروب
لتصميم محطات الصرف الصناعى والصحى
لمعالجة مياه الصرف الصناعى والصحى
مجموعة تكنولاب البهاء جروب
المكتب الاستشارى العلمى
دراسات علمية كيميائية



معالجة الغلايات وانظمة البخار المكثف
معالجة ابراج التبريد المفتوحة
معالجة الشيللرات
مجموعة تكنولاب البهاء جروب
اسنشاريين
كيميائيين/طبيين/بكترولوجيين
عقيد دكتور
بهاء بدر الدين محمود
رئيس مجلس الادارة
استشاريون متخصصون فى مجال تحاليل وتنقية ومعالجة المياه
متخصصون فى تصنيع وتصميم كيماويات
معالجة الصرف الصناعى والصحى
حسب كل مشكلة كل على حدة
تصنيع وتحضير كيماويات معالجة المياه الصناعية
مؤتمرات/اجتماعات/محاضرات/فريق عمل متميز
صور من وحدات معالجة المياه


technolab el-bahaa group
TECHNOLAB EL-BAHAA GROUP
EGYPT
FOR
WATER
TREATMENT/PURIFICATION/ANALYSIS
CONSULTANTS
CHEMIST/PHYSICS/MICROBIOLIGIST
 
INDUSTRIAL WATER
WASTE WATER
DRINKING WATER
TANKS CLEANING
 
CHAIRMAN
COLONEL.DR
BAHAA BADR EL-DIN
0117156569
0129834104
0163793775
0174041455

 

 

 

تصميم وانشاء محطات صرف صناعى/waste water treatment plant design

technolab el-bahaa group
egypt
We are a consultants in water treatment with our chemicals as:-
Boiler water treatment chemicals
Condensated steam treatment chemicals
Oxygen scavenger treatment chemicals
Ph-adjustment treatment chemicals
Antiscale treatment chemicals
Anticorrosion treatment chemicals
Open cooling tower treatment chemicals
Chillers treatment chemicals
Waste water treatment chemicals
Drinking water purification chemicals
Swimming pool treatment chemicals
Fuel oil improver(mazote/solar/benzene)
technolab el-bahaa group
egypt
We are consultants in extraction ,analysis and trading the raw materials of mines as:-
Rock phosphate
32%-30%-28%-25%
Kaolin
Quartez-silica
Talcum
Feldspae(potash-sodumic)
Silica sand
Silica fume
Iron oxid ore
Manganese oxid
Cement(42.5%-32.5%)
Ferro manganese
Ferro manganese high carbon

 

water treatment unit design


 

وكلاء لشركات تركية وصينية لتوريد وتركيب وصيانة الغلايات وملحقاتها
solo agent for turkish and chinese companies for boiler production/manufacture/maintance

 

وكلاء لشركات تركية وصينية واوروبية لتصنيع وتركيب وصيانة ابراج التبريد المفتوحة

 

تصميم وتوريد وتركيب الشيللرات
design/production/maintance
chillers
ابراج التبريد المفتوحة
مجموعة تكنولاب البهاء جروب
المكتب الاستشارى العلمى
قطاع توريد خطوط انتاج المصانع
 
نحن طريقك لاختيار افضل خطوط الانتاج لمصنعكم
سابقة خبرتنا فى اختيار خطوط الانتاج لعملاؤنا
 
1)خطوط انتاج العصائر الطبيعية والمحفوظة والمربات
2)خطوط انتاج الزيوت الطبيعية والمحفوظة
3)خطوط انتاج اللبن الطبيعى والمحفوظ والمبستر والمجفف والبودرة
4)خطوط تعليب وتغليف الفاكهة والخضروات
5)خطوط انتاج المواسير البلاستيك والبى فى سى والبولى ايثيلين
6)خطوط انتاج التراى كالسيوم فوسفات والحبر الاسود
7)خطوط انتاج الاسفلت بانواعه
Coolمحطات معالجة الصرف الصناعى والصحى بالطرق البيولوجية والكيميائية
9)محطات معالجة وتنقية مياه الشرب
10)محطات ازالة ملوحة البحار لاستخدامها فى الشرب والرى
11)الغلايات وخطوط انتاج البخار الساخن المكثف
12)الشيللرات وابراج التبريد المفتوحة وخطوط انتاج البخار البارد المكثف
 
للاستعلام
مجموعة تكنولاب البهاء جروب
0117156569
0129834104
0163793775
 
القاهرة-شارع صلاح سالم-عمارات العبور-عمارة 17 ب
فلا تر رملية/كربونية/زلطيه/حديدية

وحدات سوفتنر لازالة عسر المياه

مواصفات مياه الشرب
Drinking water
acceptable
values

50

colour

acceptable

Taste

nil

Odour

6.5-9.2

ph

 

1 mg/dl

pb

5 mg/dl

as

50 mg/dl

cn

10 mg/dl

cd

0-100mg/dl

hg

8 mg/dl

f

45 mg/dl

N02

1 mg/dl

Fe

5 mg/dl

Mn

5.1 mg/dl

Cu

200 mg/dl

Ca

150 mg/dl

Mg

600 mg/dl

Cl

400 mg/dl

S04

200 mg/dl

Phenol

15 mg/dl

zn

 

 

الحدود المسموح به
ا لملوثات الصرف الصناعى
 بعد المعالجة
Acceptable
values
treated wate water
7-9.5

ph

25-37 c

Temp

40 mg/dl

Suspended solid

35 mg/dl

bod

3 mg/dl

Oil & grase

0.1 mg/dl

hg

0.02 mg/dl

cd

0.1 mg/dl

cn

0.5mg/dl

phenol

1.5 ds/m

conductivity

200 mg/dl

na

120 mg/dl

ca

56 mg/dl

mg

30 mg/dl

k

200 mg/dl

cl

150 mg/dl

S02

0.75 mg/dl

Fe

0.2 mg/dl

Zn

0.5 mg/dl

Cu

0.03 mg/dl

Ni

0.09 mg/dl

Cr

0.53 mg/dl

لb

0.15 mg/dl

pb

 





pipe flocculator+daf
plug flow flocculator
lamella settels

محطات تحلية مياه البحر بطريقة التقطير الومضى على مراحل
MSF+3.jpg (image)
محطات التقطير الومضى لتحلية مياه البحر2[MSF+3.jpg]
some of types of tanks we services
انواع الخزانات التى يتم تنظيفها
ASME Specification Tanks
Fuel Tanks
Storage Tanks
Custom Tanks
Plastic Tanks
Tank Cleaning Equipment
Double Wall Tanks
Septic Tanks
Water Storage Tanks
Fiberglass Reinforced Plastic Tanks
Stainless Steel Tanks
Custom / Septic
مراحل المعالجة الاولية والثانوية والمتقدمة للصرف الصناعى

صور مختلفة
من وحدات وخزانات معالجة الصرف الصناعى
 التى تم تصميمها وتركيبها من قبل المجموعة

صور
 من خزانات الترسيب الكيميائى والفيزيائى
 لوحدات معالجة الصرف الصناعى
المصممة من قبل المحموعة



technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group

technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group


technolab el-bahaa group




مياه رادياتير اخضر اللون
بريستول تو ايه
انتاج شركة بريستول تو ايه - دمياط الجديدة
مجموعة تكنولاب البهاء جروب

اسطمبات عبوات منتجات شركة بريستول تو ايه-دمياط الجديدة

مياه رادياتير خضراء فوسفورية

من انتاج شركة بريستول تو ايه 

بترخيص من مجموعة تكنولاب البهاء جروب


زيت فرامل وباكم

DOT3



شاطر | 
 

 كيفية اختيار المادة الكيماوية التى تستخدم كمجلط او فلوكة

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عدد المساهمات : 3509
تاريخ التسجيل : 15/09/2009
العمر : 49
الموقع : مصر

مُساهمةموضوع: كيفية اختيار المادة الكيماوية التى تستخدم كمجلط او فلوكة   الجمعة يوليو 01, 2011 1:06 pm

How to Select a Chemical Coagulant and Flocculant.




In many water treatment processes the selection of the chemical regime is of critical importance.



The mechanical equipment will remove water contaminants to a reasonable level, but to meet the increasingly stringent Federal and Provincial licensing requirements chemical coagulation, flocculation, and disinfection are necessary. 





This paper will address several topics that will help the water treatment plant operator select the most appropriate chemical treatment programme for the needs of the community that the plant services.



Why do we Chemically Treat Water?

Water is essential for life as we presently know it and in North America we have become accustomed to receiving good quality water at a reasonable cost (on world wide terms Canadian drinking water is provided at an extremely low cost). 



In today's increasingly complex society the demands of the consumer, the medical and scientific communities, and therefore the Municipal, Provincial and Federal regulators, have caused the quality guidelines for safe drinking water to be reviewed. 





In many cases what was considered acceptable by all segments of society just a decade ago would now be thought of as unsafe.



At the present time it can be anticipated that changes will be made with respect to the following parameters



[1]; Chemicals typically find utility in the removal of suspended, colloidal and dissolved solids from water, including calcium and magnesium hardness, mineral turbidity, organic colour and other organic substances, and undesirable microbiological species that can cause health concerns in humans. 





The four broad categories of chemicals used are lime for precipitation softening, coagulants and flocculants for the removal of suspended and colloidal solids, powdered activated carbon for taste and odour, and disinfectants for the removal of pathogens.



Selection of Chemical Species. There are three fundamental variables in water treatment, all three of which will have a significant influence on the type of chemical that could be usefully employed in a particular application.





The three variables are;



1) Raw Water Quality.

2) Process Equipment.

3) Treatment Objectives.



These three variables can be further categorized as shown in the table below;






Raw Water Quality Process Equipment Treatment Objectives



Alkalinity Settling Lagoon 

Potable Application

Partial Softening

Full Softening

pH Direct Filtration

Turbidity Sedimentation + Filtration

Colour Solids Contact Clarifier

Industrial Application

General Use

Ion Exchange

Temperature Dissolved Air Flotation

Hardness Mixing Intensity

Taste and Odour Sludge Disposal




flocculant selection process a considerable amount of time and needless effort can be saved.



An understanding of how the variables effect water chemistry will allow the operator to make sensible pre-screening decisions and let him/her focus on optimizing the process to achieve the treatment goals





Raw Water Quality



Clearly the quality of the raw water and the contaminant classification, has to have a significant impact on the type of chemicals used for liquid-solids separation.





There are however several factors to consider;



1) The amount of alkalinity present in

the water may eliminate some coagulants from consideration.



2) The amount of turbidity present may

only determine the amount of coagulant that may be required.





One also has to be aware of how the raw water quality will change as a function of the time of the year.



Alkalinity



Alkalinity is of critical importance when selecting a metal salt coagulant such as polyhydroxy aluminum chloride (PACl), aluminum sulphate (alum), or ferric sulphate.





All these materials need some alkalinity to drive the hydrolysis reactions that allow the coagulants to function.



If the water has a low alkalinity, below 50 mgL-1, then the use of some of the more acidic

metal salts may be precluded.



In these instances there are two options, either add supplemental alkalinity (as NaOH, Ca(OH)2 or Na2CO3), or use ahigh basicity coagulant (>50% basicity) such as PACl or ACH. 





If the water to be treated carries a very low alkalinity loading then the use of artificial alkalinity will always be necessary. 





In such a case it might be useful to try a combination of acidic and basic aluminum salts, PACl, ACH or alum, together with sodium aluminate. Should the alkalinity be >50 mgL-1 then,





in general, there will be sufficient present to drive most coagulation reactions. However, if the coagulant dosage has to be higher (by a factor of two) than the raw water alkalinity it may be necessary add some alkalinity to drive the hydrolysis reactions to completion.





pH



The pH of the water could also determine/eliminate many treatment options. If the pH is higher than 8.5 and Dissolved Organic Carbon (DOC), often referred to as colour, has to be removed a highly acidic coagulant that will drive the pH down to ± 7.0 will have to be considered. 





It may be necessary to add some soda ash in order to bring the Langlier Stability Index back to zero after such treatment. 





If the pH is acidic great care will have to be taken to ensure that the chemical reactions occur as desired and that the finished water is stable, removal of colour will be easy. 





Ferric salts often perform well in acidic conditions. 





The most challenging conditions occur when colour has to be removed from a water that has a high pH and a low alkalinity. 






Careful depression of pH without alkalinity destruction can be realized if gaseous CO2 and Ca(OH)2 are added together. 





The choice of coagulant will determine the extent to which pH hasto be depressed. This is a somewhat sophisticated approach and would not be recommended for a smaller community with a restricted capital budget.





Turbidity



The precipitation of mineral turbidity by the classic coagulation and flocculation process is well defined and reasonably straight forward. 





Turbidity can be classified as being anionically charged silica particles. 





Often the effect that turbidity has is dependent on the amount present rather than the classification. 






In low turbidity waters (<10 NTU) an organic polyelectrolyte should not be considered. 





The choice of inorganic coagulant should be one that quickly generates the Al(OH)3 sweep floc and will form a stable sludge bed.





In moderate turbidity waters (<100 NTU) the use of a general purpose inorganic salt is preferred, and most will be successful if the other conditions are right. 





In high turbidity situations, or in those instances where surface water turbidity can increase very rapidly, a PACl blended with a polyepiamine is often the best choice. 



Sludge bed height, sludge volume, dewatering efficiency, and pH depression are all reasons to consider the PACl blend over large additions of alum or ferric sulphate.





Organic polyelectrolyte on its own will be effective, but the cost is high, and there is the potential to blind downstream filters with a high dosage of epiamine or pDADMAC (> 4.0 mgL-1).





Colour



Dissolved Organic Carbon, DOC, colour, is the parameter around which a chemical treatment regime is built. 





Hydrophillic colour is invariably more difficult to separate from water than is hydrophobic mineral turbidity. 







The complexing of colour is dependent on the pH of the water, the classification of the colour colloid, and the ability of the coagulant to break the hydrogen bonds present.


The choice of chemicals must be one that will create a water in which the colour will be least stable (usually at a pH between 5.5 and 7.0), the alkalinity will be preserved for turbidity precipitation, and the finished water will be neither corrosive or scaling.






In many applications it is difficult for one material to be completely successful by itself, especially the inorganic metal salts

.

In these instances cost performance economics dictate that a small amount of an organic short chain polymer, usually from the pDADMAC family be utilized. 





If alum or ferric sulphate is the primary coagulant, then the supplemental addition of pDADMAC will have to be via a separate feed system. 





If any of the PACl preparations are used, a one product blend can be selected.





Temperature



Temperature can affect the performance of the inorganic metal salts that rely on a chemical reaction. 



The colder temperatures (<50 C) have a profound effect on alum and iron salts to the extent that performance is often unacceptable during the winter.





It is not unusual for a water plant to have to heat the raw water to a minimum of 80 C in winter to maintain adequate finished water quality. 





Inndustrial applications carryover of alumina or iron flocs can cause process non-conformities and off specification production. 





The non-sulphated polyhydroxy aluminum chloride choice does not appear to be as temperature sensitive and is therefore a good first choice coagulant for cold water applications. 





Almost all the coagulants will perform well in warmer waters, 100 C T  250 C.



Hardness



Calcium and magnesium hardness are present in all waters to some degree or another. 





The amount of CaH and the end use of the water will determine the strategy required to handle the presence of these minerals. 





Typically lime is added to allow for the precipitation softening process to take place.







Lime sludges are dense and will tend to settle, however, it is recommended that 10 mgL-1 of an alumina coagulant be added to capture the lime fines.





It should be stressed that the coagulant is present only to capture the lime fines and not to coagulate raw water turbidity.







Lime sludges cannot be returned to the environment, so dewatering or lagoon storage is required, all coagulants should be evaluated with respect to their ability to dewater on the equipment in the water plant.





The major criteria for efficient lime softening is pH control, pH should be maintained at 10.0 ± 0.2. A metal based coagulant will consume alkalinity, especially in a well buffered high pH water, which could compromise the softening process.





industrial applications carryover of alumina or iron flocs can cause process non-conformities and off specification production. 



The non-sulphated polyhydroxy aluminum chloride choice does not appear to be as temperature sensitive and is therefore a good first choice coagulant for cold waterfine particles that have to be well coagulated. 





Most of the coagulants will settle PAC/organic particles, however because of the very fine nature of the species it is better to choose a coagulant that generates the densest sludge. 



The correct choice will result in minimal pin floc carryover, while the incorrect choice will be characterized by a low consistency sludge bed and observable pin floc carryover. applications.





Almost all the coagulants will perform well in warmer waters, 100 C T  250 C.



Hardness Calcium and magnesium hardness are present in all waters to some degree or another. 







The amount of CaH and the end use of the water will determine the strategy required to handle the presence of these minerals.





Typically lime is added to allow for the precipitation softening process to take place.




Lime sludges are dense and will tend to settle, however, it is recommended that 10 mgL-1 of an alumina coagulant be added to capture the lime fines. 







It should be stressed that the coagulant is present only to capture the lime fines and not to coagulate raw water turbidity. 







Lime sludges cannot be returned to the environment, so dewatering or lagoon storage is required, all coagulants should be evaluated with respect to their ability to dewater on the equipment in the water plant.







The major criteria for efficient lime softening is pH control, pH should be maintained at 10.0 ± 0.2. 







A metal based coagulant will consume alkalinity, especially in a well buffered high pH water, which could compromise the softening process. 







The best coagulant is therefore a pre-hydrolysed species with a high basicity. PACl has been found to be very suitable for lime softening applications. 







A flocculant is seldom needed, but filtering is always recommended.










The only major problem encountered with a lime softening programme is if there is a need to soften at a high pH and remove organic colour at a low pH. 







The only real solution is to make a capital investment in two clarifiers, arranged in series. 




Initially the raw water is treated in a conventional way, at pH 7.0, a low basicity coagulant should be added to ensure that a good sludge bed is maintained for the straining and filtering action. 







This is followed, in a separate clarifier, by the lime softening step, at pH 10.0 with a high basicity coagulant.







In municipal applications, where the requirement is to reduce hardness to<100 mgL-1 flocculants are not recommended, however the water should always be filtered. 







In those industrial applications where the water is sent to an ion exchange stage, hardness is reduced to [1]40 mgL-1 and a flocculant is always used. Filtering is still required prior to the ion exchange equipment. 







The advantage of a low basicity coagulant is even more pronounced in full softening applications, and the non-sulphated PACl is the coagulant of choice.







Taste and Odour




Taste and odour can be controlled in a variety of ways, but one of the most common is with the addition of powdered








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