انواع الكيماويات المستخدمة فى معالجة وحدات تحلية المياه بالاغشية الاسموزية

Fouling and scaling

by
colonel.dr
bahaa badr
chemical consultant

Fouling is the common name for all types of deposits blocking the membrane surface.

Four types of foulants may be distinguished:

• Chemical foulants, which cause scaling

• Physical foulants, which are related to deposition of particle,

• Biological foulants which can form bio-fouling

• Organic foulants, which can interact with the membrane.

The general mechanisms of scale formation and prevention .The most widely spread technique for scale prevention is based on the use of anti-scalants.

Anti-scalants consist of polymeric substances that are able to inhibit scale formation at low dosages – a condition imposed by economic limitations.

Basic information on the action of anti-scalants is scarce and the rational use of anti-scalants is restricted by the lack of adequate technical information.

types of chemicals

RO Antiscalants,

RO/UF/MF Membrane Cleaning Chemicals, Biocides

Membrane Disinfectants and Potable Water Corrosion Inhibitors

RO / NF antiscalants and antifoulants and non-oxidizing biocides have eliminated or resolved issues related to calcium carbonate, calcium phosphate, calcium sulfate, barium sulfate scaling, as well iron and silica fouling and membrane biofouling in Reverse Osmosis and Nanofiltration systems

Membrane Antiscalants

1-Broad spectrum antiscalant, especially effective where a high potential for calcium sulfate formation exists

2-Premium antiscalant for control of severe calcium sulfate scaling in the presence of iron. Also effective in stabilization/dispersion of iron, manganese and other metal ions

3-Premium antiscalant for control of high levels of calcium sulfate in the presence of moderate levels of silica

4-Broad spectrum antiscalant. Controls calcium carbonate up to LSI of 2.6 and very effective on barium sulfate scale

5-Premium antiscalant for control of carbonate and sulfate scales in the presence of iron. Also stabilizes/disperses iron, manganese and other metal ions

6-Premium antiscalant for control of carbonate and sulfate scales in the presence of moderate levels of silica

7-Premium silica antiscalant for extreme conditions. Controls reactive silica up to 250% of its saturation level

8-Premium antiscalant for inhibiting and dispersing inorganic scales and deposits

9-Premium broad spectrum antiscalant with calcium carbonate control up to an LSI of 3.0. Inhibits carbonate and sulfate scales even in the presence of high levels of iron. Disperses metal oxides and stabilizes metal ions

Membrane Antifoulants

1-Biofouling inhibitor, disperses biological films and some organics to increase operational time between cleanings in highly fouling waste water RO and surface water intake RO systems

Membrane Cleaners

1-Powder surfactant for removal of colloidal foulants, silt, clay and biofilms

2-Powder low pH cleaner for removal of carbonate scales and metal oxides. Assists in removal of sulfate scales

3-Powder cleaner for heavy iron fouling

4-Powder high pH cleaner for removal of biofilms, greases and oils. Assists in removal of sulfate scales

5-Powder high pH cleaner for extreme organics and biological fouling

6-Liquid surfactant for removal of colloidal foulants, silt, clay and biofilms

7-Liquid low pH cleaner for severe calcium carbonate scaling, highly effective in removal of metal oxides / metal hydroxides. Assists in removal of sulfate scales

8-Liquid phosphate-free low pH cleaner for severe calcium carbonate scaling, highly effective in removal of metal oxides / metal hydroxides. Assists in removal of sulfate scales

9-Liquid high pH silica cleaner

10-Liquid high pH cleaner, used for removing organics, biofilm, iron and various

Post Treatment Chemicals

1-Corrosion inhibitor for potable water distribution piping. Protects steel and brass fittings from pitting and eliminates red water. Also prevents leaching of lead into potable water supply. NSF approved for use in potable water

2-Distribution system corrosion inhibitor for use with Reverse Osmosis treated water. Eliminates red water and prevents leaching of lead into potable water supply. Low zinc formula minimizes load on wastewater treatment plants without sacrificing the invaluable benefits of cathodic protection. NSF approved for use in potable water

3-Potable and hot water system corrosion inhibitor for use with low to moderate hardness water. "NSF approved for use in potable water"

4-Distribution system corrosion inhibitor designed especially for use with Reverse Osmosis treated water. Provides powerful cathodic protection in addition to forming a protective anodic film on steel, copper and brass metal surfaces. Eliminates red water, protects against release of cement from water mains, and prevents leaching of lead into the potable water supply. NSF approved for use in potable water

5-Distribution system corrosion inhibitor for use with Reverse Osmosis water. Protects steel, copper and brass and eliminates red water. Inhibits leaching of lead into potable water supply and reduces microbiologically induced corrosion. NSF approved for use in potable water

Reverse Osmosis Chemicals

by
colonel.dr
bahaa badr
scientific consultant

Antiscalant and Dispersant for RO Membrane

(1). Inhibit inorganic scale formation for a wide concentration span, the largest permitted LSI value is 2.8 when no acid is added

(2). Not flocculate with ferric oxide, aluminia oxide or silica oxide to form suspended substance

(3). Inhibit the pollution from ferric, aluminium or heavy metals pollutants. The permitted ferric concentration for inlet water supply can reach to 8.0ppm

(4). Inhibit the flocculate and deposit of silica, the permitted silica concentration for condense side can reach to 290ppm

(5). Be used in CA, TFC, NF and UF membranes for RO system

(6). Good solubility and stability

(7). Effective in pH 5-10

Antiscalant and Dispersant for RO Membrane

1. Used together with organic flocculants

2. Used for drinking water system

3. Inhibit scales formation of calcium carbonate, calcium sulfate, barium sulfate and strontrium sulfate, no scale is formed even when LSI value is 3.0

4. Used for almost all RO membranes

5. Maintain the surface of RO membrane clean by dispersing particle blockage

6. Effective in pH 5-9

7. Used directly, or after dilution

8. Good resistance to aluminia oxide and ferric oxide

Antiscalant and Dispersant for RO Membrane

1. Used together with organic flocculants

2. Used for drinking water system

3. Inhibit scales formation of calcium carbonate, calcium sulfate, barium sulfate and strontrium sulfate, no scale is formed even when LSI value is 3.0

4. Used for almost all RO membranes

5. Maintain the surface of RO membrane clean by dispersing particle blockage.
6. Effective in pH 5-9

7. Used directly, or after dilution

8. Good resistance to aluminia oxide and ferric oxide

Antiscalant and Dispersant for RO Membrane

1. Used in many water quality system, high scale inhibition ability

2. Lower scale deposit and reduce RO pipeline cleaning frequency

3. Reduce or replace the acid fill treatment

4. Good economic effect

5. Suitable for all RO pipeline type, and as an effective ferrium insulator

6. Stable and effective than calgon(SHMP)

7. High water flux density for RO pipeline

Antiscalant and Dispersant for RO Membrane

1. Original liquid is 11 times concentrate, 90% transportation cost and storage space is saved

2. Prevent pollution from inorganic salt, metal scale and some organic substances

3. Not flocculate with ferric oxide, aluminia oxide or silica oxide to form suspended substance

4. Effectively control the pollution of ferric, aluminium and heavy metal

5. No content of any phosphate of phosphorous

6. Used in RO CA, TFC, NF and UF membranes

7. Good solubility and stability

8. Stable in extreme pH and temperature

9. Due to special molecular structure, it is safe to membrane. Even high medicine input (equipment trouble, for example) will not lead to its deposit, crystallization or adsorption on membrane surface and lead to membrane blockage

Acid Detergent for RO Membrane

1. Suitable for all aromatic polyamide membranes

2. Low froth formula

3. Diluent pH 3.0-4.0

4. Liquid chemicals, mix well

5. Can be used repeatedly

an acid liquid formula, it can remove metal hydroxide, calcium carbonate and other types of scales

Alkali Detergent for RO Membrane

1. Suitable for all aromatic polyamide and acetate acid membranes

2. Effectively remove oil, organic substances and bio-mucosa from membrane surface

3. Temperature increased, the effect will be better

4. Diluent pH 10.5±0.5

5. Liquid chemicals, mix well

6. Can be used repeatedly

an alkali liquid formula, it can remove oil, organic substances and bio-mucosa

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