Silica Sand for Water Filtration

21

Nov, 2013

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Silica Sand for the water filtration

What do you know about filter sand and gravel ?

At first, we need to know where the idea of using sand and gravel in filtering process came from?

The idea of filtering water to obtain clean drinking water dates back to the Pharaonic Era, i.e. 4000 BC, where researchers found traces of a sand filter in Alexandria dating back to the year 50AD. This filter was used to filter water to obtain safe drinking water. Since then, the idea of using sand filters to treat surface water came to light, with the purpose of purifying such water to obtain safe drinking water.

☻ At the beginning of the application of the theory of filtering by sand and gravel, slow sand filters were designed, where they were used extensively in England and Scotland. This was followed by the expanded use of slow sand filters about fifty years later in the United States of America.

☻In 1880, Patrick Clark developed the slow sand filter, increased the filtering rate and reduced the area of land used to construct filters in the United States of America, in particular the State of New Jersey. Developed sand filters with high filtering rates were called “Rapid Sand Filters”. Such filters were of great benefit in case of not using treatment by chemical clarification, which is followed by the sedimentation process.

☻After that, several types of filters were invented, as they were classified according to filtering rates, operating methods, direction of water flow and method of controlling the sedimentation process.

☻That’s where the research started to know how to choose the filtering medium for filters, as many kinds of natural materials were used as a filtering medium, including:

  1. Silica Sand
  2. Anthracite Coal
  3. Granet
  4. Ilmenite

☻After several experiments, it was found out that the first type, i.e. silica sand, is the most commonly-used type in Egypt and it was brough from sand quarries, as it was found out that silica sand is cheap compared to other types and there are large quantities in Egypt.

☻When taking a sample of sand or gravel from any area in the quarry, we notice that it contains grains of different diameters.

In order to find out the percentage of components of sand sample on the basis of diameters, we use a set of sieves placed over each other to pass a specific weight of sand and know the weights of sand with different diameters in each sieve, in order to indicate the percentage of weights of sand grains with different diameters. This process is known as (testing sand grains by sieves). We will address this topic in detail in the next article, God willing.

 

Why use silica sand as filter media on the water filtration and how it works?

Silica sand has for a long time been used to clean as well as purify the water. 4 grades of the silica sand are majorly used for the water filtration all over the world.  Earliest recorded of the silica sand has been traced back to the year 1804 when a man by the name John Gibb, was able to design as well as install experimental filter. This unique way filtration got to be refined during the years that followed and it culminated with installation of global first public water supply by James Simpson for Chelsea Waterworks company in the year 1829. Water treatment practice later on became mainstream after physician, John Snow, made the connection between quality of the water as well as incidences of Cholera in the year 1845/1855. In our website, we have various products which will suit you.

Today, provision of the good quality portable water is taken for granted in much of developed world. So, how exactly does it work. Natural silica sand has the sub-angular to the rounded shape, that does make them ideal filtration media to be able to capture the suspended solids in the water. As a result of the high silica content, sand is durable and hard-wearing, which allows it to graded precisely so as to facilitate an efficient filtering.

To begin these grades do include 16/30, 8/16, 6/14 and 14/25, 20/40,18/8, 2/4,3/6, 6/13, 13/19, and14/25. When it comes to the silica grade, it can easily be determined either using the size range or by the use of the Effective size (D10) as well as UC.

Silica sand gets to be laid on top of the supporting layer of the gravel within filter vessel. Incoming water enters filter and the migrates through silica sand, hence successfully removing any solid or even debris from water. As a result of its uniqueness in terms of its properties, the silica sand is usually used for the water filtration in a wide variety of the applications that does include swimming as well as leisure, paper processing, power generation, chemical processing and portable as well as waste water treatment.

In the market, there are various types that are available. The pressure filters are operated with the feed pressure of two to five bar and usually used in the leisure applications. Feed water does enter and the passes through the bed of silica sand. Majority of particulate solids are usually captured high up in filter bed, this kind of filter is able to capture even the small particles. Buildup of the particulate solids does cause an increase in pressure loss across bed for a certain given flow rate. When this pressure loss or the flow rate is not acceptable bed is back washed to be able to remove accumulated particles.

Rapid gravity filters

The rapid gravity filters are used for water purification, mostly used at the drinking water treatment works. They do require smaller land areas in relation to the slow sand filters and use the silica sand as well as other granular media so as to remove the particles as well as impurities.

 

Silica Sand for Water Filtration

 

This is our product of the filter sand as well as filter Gravel that is exported to over 17 countries in various parts of the world. Our silica sand is extracted from the high quality quarries with the SI02 over 96.7% that was the river sand for many years. Raw material gets to be extracted from East Egypt, wady al Natron, Sadat City, Giza.

 

Silica Gravel water filtration

The Silica gravel that we produce does have a porosity as well as permeability so that the water can easily flow through it, usually often by the gravity drainage. Silica Gravel does filter large debris such as leaves, grass, etc. It is important to note that it does not clean or even purify the water at all.

Silica Sand for Water Filtration

water filtration sand our product of filter sand and Filter Gravel Exported to more than 17 countries in all over the World. We Are Extracting from High Quality Quarries with SIO2 more than 96.7% which was river sand since thousands of years. The raw materials is generally Extracted from East Egypt, wady al Natron, Sadat City, Giza.

Silica sand for water filtration

We produce and process our products in our own screening plant which biggest in Egypt, that is why we confirm stability of quality in long term supplying with Worldwide companies in field of water filtration and Water Treatment, we are Exporting to many countries (Greece – Cyprus – Spain – Italy – Georgia – Croatia – Albania – Japan – Senegal – Philippines – Malta – Turkey – Mauritius – China – India – Indonesia – Ireland – South Korea – Singapore – Mayotte Island, Syria – United Arab Emirates – Sultanate of Oman – Qatar – Kuwait – Libya- Iraq-Yemen-Algeria-Bahrain-Palestine-Kingdom of Saudi Arabia-Sudan)

silica sand for water filtration

Cairo Filter Sand is used to filter and clean Portable water filters and pool filter and sewage treatment plant Purity MORE Than 96%, Free of any organic materials, no clay, no Radiation, no toxic materials.

Cairo Filter Sand Meets EN12904 and AWWA B100-96 and BS:910(1969)

 

Filter Silica Sand and Filter Silica Gravel used for Water Filtration

Chemical name(s): Silica, silicon dioxide

Synonym or common names: Silica sand and silica gravel.

Commercial forms: sand and silica gravel according to this standard are available in different particle size ranges.

Physical properties of silica sand and silica gravel

Appearance

  • The product is a grey/white, yellow or multicolored granular material.
  • The structure is crystalline, with a smooth to rough texture.
  • The particle shape is spherical or angular depending mainly on the origin and manufacturing procedure (quarrying or dredging, or crushing). The shape influences filtration performance, see A.3.
  • The product shall be generally homogeneous and shall be visibly free of extraneous matter.

Particle size distribution of Silica Sand and Silica Gravel

  • The particle size distribution shall be described by either:
  • effective size: (c/^q j, with a maximum deviation of ± 5 %;
  • uniformity coefficient: (U), shall be less than 1,5; minimum size : (d* \, with a maximum deviation of ± 5 %;
  • The maximum contents of oversize and undersize shall be a mass fraction of 5 % for the application of the product in multi media filters and a mass fraction of 10 % for use in single media filters. For use as a support layer, maximum contents of oversize and undersize of mass fraction of 15 % are acceptable. See A.2.3 for examples of available particle sizes that are used.
  • The particle size of silica sand and silica gravel can decrease during transportation and handling. Other values can be necessary for certain applications.

What is Density of silica sand?

  • Bulk density loose of Filter sand and Filter Gravel
  • The bulk density loose shall be in the range of 1 400 kg/rn° to 1 700 kg/m .

Bulk density packed of filter sand and filter Gravel

The bulk density packed shall be in the range of 1 500 kg/m3 to 1 900 kg/m3.

Chemical properties of silica sand and Filter gravel

The minimum purity requirements for silica sand and silica gravel used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the products. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities.

Users of these products should check the national regulations in order to clarify whether it is of appropriate

purity for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives u;..m in tin.- pn;d>i<,U; nnl stated in this articles.

Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials lead to significant quantities of impurities, by-products or additives being present, this shall be notified to the user.

Silica sand and silica gravel shall be 96%, in from our quarries.

Acid- soluble material gives information about the source of silica sand and silica gravel.

After filling, washing and commissioning of a filter system producing drinking water the silica sand or silica gravel should not increase the concentrations of chemical parameters (see [1]).

Water-extractable substances, determined in accordance with the method for granular materials given in EN 12904, can be used to estimate the leaching of the chemicals specified in EN 12902.

Test methods of silica sand for water filtration

 Sampling

Prepare the laboratory sample(s) required by the relevant procedures described in EN 12904.

Analysis of silica sand and silica gravel for water treatment

Particle size distribution of filter media of silica sand and silica gravel

The particle size distribution shall be determined on samples taken at the point of manufacture using the method of test given in EN 12904.

     · Bulk density loose

The bulk density loose shall be determined in accordance with EN 12904,

Bulk density packed of silica sand gravel for swimming pool filter sand.

The bulk density packed shall be determined in accordance with EN 12904.

Content of silica

The content of silica shall be determined in accordance with EN 12904( 96%.)

Acid-soluble material test of silica sand for water filtration

The content of acid-soluble material shall be determined in accordance with EN 12902.

Labelling- Transportation-Storage

Means of delivery

Silica sand suppliers

Silica sand for water filtration shall be delivered in bags, semi-bulk containers, or bulk.

In order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use.

Risk and safety of silica sand labeling according to the EU

Silica sand for water filtration are not subject to labeling regulations at the date of publication of this document.

NOTE 1 Annex I of the Directive 67/548/EEC on Classification, packaging and labeling of dangerous substances and its amendments and adaptations in the European Union contains a list of substances classified by the EU. Substances not in this Annex I should be classified on the basis of their intrinsic properties according to the criteria in the Directive by the person responsible for the marketing of the substance.

Transportation regulations and labeling of silica sand for filtration and gravel filter media

Silica sand and silica gravel are not classified as dangerous goods.

Marking Of Silica sand and Gravel For Filtration

The marking shall include the following:

name “silica sand” or “silica gravel”, trade name, grade and type; net mass;

  • Name and the address of the of our Company statement “This product conforms to EN 12904”.
  • Storage Of Silica sand for filtration
  • Long term chemical stability

Silica sand and silica gravel can be stored for an unlimited period of time and shall be adequately protected from outside contamination.

  • (Informative
  • General information on silica sand and silica gravel
  • Origin
  • Raw material

Natural silica sand,swimming pool filter sand, silica gravel. Is mainly from Egypt

Manufacturing process of filter media, filter sand, filter Gravel

Silica sand for water filtration are produced by quarrying, dredging or crushing, cleaning, drying, and sieving.

  • Typical properties
  • Chemical composition

The composition depends on the origin. Typical values (mass fraction) will be according to EN12904.

     · Chemical composition

Mineralogical and petrol logical analyses give additional information.

     · Mechanical strength of silica sand and silica gravel

The mechanical strength of silica sand and silica gravel is high

Abrasion products consist of dust and small particles of material They are ; formed during transportation , filling. and washing. Abrasion products are not completely removed by washing.

The existing methods for determination of abrasion do not lead to exact results regarding behavior of filter media during operation. They can be used only for comparison of different filter media.

  • Density
  • Absolute density

The absolute density is generally in the range of 2,5 g/cm° to 2,8 g/crn°.

     · Particle density dry

The particle density dry is generally in the range of 2,5 g/cm3 to 2,8 g/cm3

· Particle density wet

The particle density wet is generally in the range of 2,5 g/cm3 to 2,8 g/cm-1.

     · Function

Silica sand and silica gravel are used as filtering or supporting materials.

     · Specific amount of quantity of silica sand

The amount of silica sand and silica gravel used depends on application. Filtration rate and filter media depth vary with the suspended matter content of the water to be filtered.

     · Means of application

Silica sand and silica gravel are used in open or closed, single or mull media, filters. Silica sand is also used in “slow sand filtration” systems.

     · Secondary effects

The products have no secondary effects.

Hydraulic characteristics of Silica sand used in water Filtration.

     · Interstitial volume

The interstitial volume is approximately 0,4 (V/V). If used for calculations the interstitial volume should be measured.

     · Head loss in filtration

Head loss depends on size, shape and roughness of particles, filtration rate, filter bed depth, and water temperature.

The expansion during washing depends on flow rate, effective size, density, shape and roughness of particles, and water temperature.

     · Rules for safe handling and use in water treatment by using Silica sand and Silica gravel as Filter Media.

swimming pool filter sand is not hazardous products: it is recommended to avoid dust formation;

When handling dry product the use of a dust mask is recommended, especially when using air conveying,

     · Emergency procedures of silica sand for filtration and gravel for Filtration

First aid in case of Using swimming pool filter sand

contact with skin, it is recommended to wash with water.

In case of contact with eyes, it is recommended to flush-with plenty of water.

inhalation, it is recommended to move to fresh air.

· Spillage of swimming pool filter sand and silica gravel for filtration as Filter Media

It is recommended to sweep up and to discard in a refuse container or repackage.

Fire Expected of swimming pool filter sand and Filter Gravel

No special requirements are necessary.

Cairo Filter Sand

  • Full range of Grades and Practical Size from 0.200 mm-350 mm
  • WE have our own lab for following up quality insurance with each Batch
  • NO radioactive substance
  • SIO2 min 96%
  • Mechanical Strength of silica sand is High
  • The bulk density of un-compacted Silica Sand may vary within 1400 kg/m3 to 1700 kg/m3.
  • Mechanical Strength of silica sand is High
  • Silica Sand Shape: is rounded.
  •  free of heavy metals
  • NO TOXIC
  • without poly cyclic Aromatic Carbons (Suitable for Portable water treatment plants and wastewater treatment).
  • 100% Natural sand.
  • High acid solubility resistance in HCL
  • Hardness 7 Moh
  • NO ODOR, No Dirt, No Stains

is being screened and sieved into different grain sizes according to Effective sizes For each filter systems.

We have our own three screening plants which enable us to keep stability in quality and meet large orders.

Our Competition

In our business that we produce By Our Own machinery, we always have Enough Stock Of Each Grade of swimming pool filter sand.

Wide Varieties of Packing for swimming pool filter sand

Has Its Own Skilled and Qualified manpower that can do the product in

  • Small bags of 25 kg or 50 kg
  • Big Bags of 1500 kg
  • We customize the packing according to client requirement
  • Private label can be arranged
  • Bags either PP or PE or PP laminated
  • Bags can be mounted on EURO pallets We have long Experience of shipping.
  • We can ship on trucks of domestic transportation.
  • load in 20 feet for overseas shipping.

Characteristics

Color Brown/Yellowish(off White )
SiO2 96.90%
Fe2O3 0.29%
AL2O3 1.00%
K2O 0.070%
Turbidity <100
Hardness 6 – 7 Mohr
Attrition Loss below 1% in 100 hours back washing
Acid Solubility below 2%  [24hours in 20% Hal]

 Sample of Grades of Filter sand and Filter Gravel produced in our screening plant

Silica sand Sizes according to EN12904&ANSI/AWWA B100-01//BS:910(1969)

Silica sand for filtration size

0.4mm

0.8mm

Silica sand for filtration size

0.40mm

1.30mm

Silica sand for filtration size

0.20mm

0.70mm

Silica sand for filtration size

0.40mm

1.60mm

Silica sand for filtration size

0.40mm

2mm

Silica sand for filtration size

0.50mm

1mm

Silica sand for filtration size

0.50mm

2mm

Silica sand for filtration size

0.6mm

1.18mm

Silica sand for filtration size

0.63mm

1mm

Silica sand for filtration size

0.60mm

1.50mm

Silica sand for filtration size

0.60mm

2mm

Silica sand for filtration size

0.60mm

2.60mm

Silica sand for filtration size

0.85mm

1.7mm

Silica sand for filtration size

1mm

1.6mm

Silica sand for filtration size

1mm

2mm

Silica sand for filtration size

1mm

2.50mm

Silica sand for filtration size

1mm

3mm

Silica sand for filtration size

1.18mm

3.2mm

Silica sand for filtration size

1.60mm

2.50mm

Silica sand for filtration size

2mm

3mm

Silica gravel for filtration size

2mm

4mm

Gravel for filtration size

2mm

6mm

Filter gravel media size

2.36mm

4.75mm

Silica Gravel Sizes According to EN12904 &ANSI/AWWA B100-01/BS:910(1969)

Filter Gravel size

3.15mm

5.6mm

Filter Gravel size

3mm

6mm

Filter Gravel size

5.6mm

8mm

Filter Gravel size

6mm

12mm

Filter Gravel size

6mm

13mm

Filter Gravel size

6mm

20mm

Filter Gravel size

8mm

12.50mm

Filter Gravel size

12.50mm

16mm

Filter Gravel size

13mm

20mm

Filter Gravel size

13.5mm

26mm

Filter Gravel size

20mm

50mm

Filter Gravel size

25mm

40mm

 

 

 

 

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