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SEPLITE® LSC 714 is a  high arsenic selectivity iron loaded resin specially developed for potable water and other
solutions.

 LSI 714  is specially prepared to be taste and odour free and is WQA certified to meet the ANSI/NSF 61 standard for potable water.

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Description -Arsenic Removal Media LSC 714

About Chelating Resins.

Chelating resins are a subgroup of ion exchange resins that have a high selectivity of at least one particular counter-ion species. The interaction of a functional group (ligand) of chelating resin and metal (in form of cation or oxoanion) is selective with respect to the nature of the metal.  In the case of chelating resins counter ions are bound to resin by coordinate covalent bond or by its combination with electrostatic interactions. In the case of ion exchange, electrostatic force between oppositely charged functional group and ion in solution plays the main role. SLC 714 is an iron loaded (III) chelating resin used as an adsorbent for removing Arsenic from potable water and waste water.

 

About Arsenic

Arsenic is a natural element that is widely found in the Earth’s soil. Arsenic compounds are used commercially and industrially in the manufacture of a variety of products such as transistors, lasers,semiconductors, glass production, pigments, textiles, paper, metal adhesives, ceramics, wood preservatives, explosives and pesticides. There are two forms of arsenic – organic and inorganic. High levels of organic arsenic occur naturally in many types of food such as seafood. When eaten it is quickly eliminated by the body and normally poses a low risk to human health. Inorganic arsenic is found naturally in soil or rock where it can enter surface and groundwaters. Inorganic arsenic can pose a serious risk to health.

How does arsenic get into drinking water?

Drinking water can be contaminated with inorganic arsenic by either wind-blown dust, leaching or runoff from soil, rocks and sediment. Groundwater sources such as bores are usually at greater risk of contamination from inorganic arsenic than surface and rain water supplies.

What are the potential health effects of arsenic?

Consuming very high levels of arsenic can cause acute poisoning and death. However, exposure to lower levels can cause decreased production of red and white blood cells, damage to blood vessels and a sensation of “pins and needles” in hands and feet. Swallowing or breathing low levels of inorganic arsenic for a long time can cause a darkening of the skin and the appearance of small “corns” or “warts” on the palms, soles, and body. Long term consumption of arsenic may increase the risk of skin cancer, cancer in the liver, bladder and lungs. If you have consumed water that has been contaminated by arsenic the potential affect on your health will depend on the following factors:

• How much arsenic you have been exposed to.
• How long and how often you have been exposed.
• The type of arsenic you have been exposed to.
• Your health, nutrition, age and lifestyle.

It is possible for some people to be affected by lower levels of arsenic than others. Young children,
the elderly, people with long-term illnesses, and unborn babies are at greatest risk. However,
arsenic is not transferred through breast milk to babies.

 

About LSC 714 Arsenic Removal Media

Arsenic can be removed by passing untreated water though adsorptive granular media contained in a pressure vessel. As the water passes through the media, The negatively charged arsenic V ions are adsorbed onto the surfaces of the positively charged media particles. There are currently several adsorption media available: activated alumina (AA), titanium based media, zirconium based media, and iron based sorbents. The most common media include modified activated alumina and iron-based materials.  LSC 714 is a  high arsenic selectivity iron loaded resin specially developed for potable water and other solutions.

Apart from potable applications, LSC 714 is also used in waste water treatment applications.  Wastewater treatment systems face increasingly stringent discharge limitations, in many cases lower than the limits for the supplies used as feed water. Ion exchange resins and adsorbent medias are often ideally suited for removal of specific contaminants and/or for polishing the effluent from other waste water treatment processes. It can be used only in neutral and alkaline conditions as the resin is regenerated by an acid.

 

PHYSICAL AND CHEMICAL CHARACTERISTICS
Product LSI 106 

Matrix Structure                              Crosslinked(Styrene with DVB:

Physical Apperance                        Brownish /red spheres

Physical Appearance                     Spheres
Particle range mm                          0.425-1.25 (98%)
Moisture Content                           50-60%
Bulk Density g/l                               750-850

Density g/l                                           1180-1280
Total capacity eq/L                         0.5-4 g/As per litre

 

Pre-treatment of new resin
New resin is ready to use.
Load resin with water. Avoid air bubbles inside the resin bed. Wash resin bed with purified water at 3-5BV/h until  outlet water is clear.
Operation
Recommended contact time 2.5-3.0 minutes
Temp. limit 80°C
PH limit 4.5-8.5
Service flow rate 4-10BV/hr
Check outlet solution of Arsenic content every 10BV. Stop running when As content exceeds the threshold.
Regeneration
(1) Rinse resin with purified water.
(2) NaOH solution wash
Solvent 2% NaOH solution + 10% NaCl
Volume 3-4 bed volumes (3-4 BV)
Flow rate 2 BV/hr
Temp. <40 °C
Water rinse end PH<10
(3) For alkali sensitive solution, an addition step is necessary.
Solvent 1% acid (eg. Citric acid)
Volume 3-4 BV
Flow rate 2 BV/hr
Water rinse end PH>5

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