Ion-exchange Water Softener
Principles of Ion Exchange to Soften Water
Calcium and magnesium ions are atoms having a positive electrical charge, as do sodium and potassium ions. Ions of the same charge can be exchanged. In the ion exchange process, a granular substance (usually a resin) that is coated with sodium or potassium ions comes into contact with water containing calcium and magnesium ions. Two positively charged sodium or potassium ions are exchanged (released into the water) for every calcium or magnesium ion that is held by the resin. This "exchange or trade" happens because sodium or potassium are loosely held by the resin. In this way, calcium and magnesium ions responsible for hardness are removed from the water, held by the resin, and replaced by sodium or potassium ions in the water. This process makes water "soft." Eventually, a point is reached when very few sodium or potassium ions remain on the resin, thus no more calcium or magnesium ions can be removed from the incoming water. The resin at this point is said to be "exhausted" or "spent," and must be "recharged" or "regenerated."<o:p>
01. By means of Absorbing the calcium and magnesium ions in water with resin, since the hardness of water is mainly composed of calcium and magnesium, in general, we adopt cation exchange resin (softener), replace Ca2+, Mg2+ (main ingredients for scale) in water, as the increase of Ca2+ and Mg2+ in resin, removing performance on Ca2+, Mg2+ of resin will gradually reduce.
02. When the resin has absorbed a certain amount of calcium and magnesium ions, it must be regenerated, the regeneration process is that flush resin layer with the salt water in salt box, replace hardness ion out of the resin again, and discharged from the tank with waste liquid of regeneration, then resin resumed the function of softening and exchanging.
03. The principle of sodium ion exchange and softening treatment is to exchange cation in the raw water with resin, hardness constituents Ca2+and Mg2+ in water exchange Na+ in resin, thus absorb the Ca2+and Mg2+ to make the water to be softened.
2RNa + Ca2+ = R2Ca + 2Na+
2RNa + Mg2+ = R2Mg + 2Na+
After the water treated by sodium ion exchanger, the Ca+ and Mg+ were superseded by Na +.
Application scope of softener
Mainly used in industry and civil water softening preparation, such as Boiler feed water make-up water, air conditioning system make up water, heat exchanger, power plant, chemical, textile, printing and dyeing, bio-pharmaceutical, Electronic system and water pretreatment.
Water softeners have three main components: A mineral tank, brine tank, and control valve. Smaller capacity models combine the mineral tank and brine tanks into one cabinet, but the two tanks are still separated within the cabinet.
Larger flow capacity systems have a separate stand-alone mineral and brine tanks.
Mineral Tank: The mineral tank is where the action is. It is where the water filtration takes place and the hard water is softened (calcium and magnesium are removed).
Brine Tank: The brine tank is where a highly concentrated solution of salt or potassium is stored.
Control Valve: The control valve is the device that controls the flow of water into and out of the mineral and brine tanks during regeneration.
The brine tank is just what its name suggests, a plastic tank that contains a brine, water saturated with salt. The brine solution is typically made with salt or sodium. However, problems may result if you are on a restricted low sodium diet in that some of the sodium is transmitted into the drinking water.
Also, the bacteria in septic systems so necessary for the breakdown of waste may be adversely affected by high concentrations of sodium. So as an alternative, potassium may be used. Potassium is considered superior and environmentally friendly, albeit a bit more expensive, than salt and does not affect your health, watersheds, or the environment or your septic system.
Type choice:
Softener equipment applies cation resin for softing raw water,its main target is to use cation resin to adsorp (main parts of ),encreasing the hardness of raw water.
1. Users can choose manual operation control system for saving cost.
2. If users using for 24 hours can accord to water using time choosing for rebirth
3. Uses can according to water quality requirement:first grade multi-media filter,which can remove mud,rust,colloid and suspension in water.Second grade activated carbon filter,which can remove color,olfactory,biochemistry organic in water and encrease the left oxygen value and pollution in water.Third grade equiped softener equipment.
4. Effluent water capacity achieves the water supply of national low-pressure bioler.
5. Time control- type;flow control- type.In working ,apply single-tank,double-tank and multi-tank etc. other varied combination method.When choosing,users can choose as their needs.In operation,it has not only automatic function,but also is manual operation.
Technoloty index and working
Water pressure:0.18-0.6Mpa
Working temperature:1°c-55°c
Hardness of raw water: <8mmol/L
Operation method:manual/automatic
Hardness of effluent water: ≤0.03mmol/L
water flow: 0.3-100 m3/hour
Rebirth method:
Control method: time or flow
Working electricity: 220V/50Hz,customized
Application
System automatic water softener widely used in steam bioler,heating bioler,exchanger,air conditioner, and other systems water softener,also used in hotel,restruant,office, and other life water treatment and food,drinking,wine,washing,textile,chemical,medicine and other industrial softener water treatment.
Type II.dual-tank and dual-valve, two tanks work simultaneously but regenerate at different time
Type III.:dual-tank and single valve,one work one standby
Our softeners are effective in:
Preventing scale in the hot water system and around taps
Removing existing scale
Reducing boiler fuel cost and heating system maintenance costs
Preventing soap scum, which is evident around the bath and sink
Improving the texture of laundry by preventing detergent scum deposits within the fibers of clothes, bedding, etc.
Reducing soap and detergent costs.
Operation and Maintenance
Maintenance of water softeners is largely confined to restocking the salt supply for the brine solution. Semiautomatic models require either a manual start of the regeneration cycle or regular service for a fee.
The resin should never wear out. If resins are not regenerated on a regular basis, at the proper intervals, they may become contaminated with slime or impurities and require replacement. Resins can also become clogged with tiny particles of iron if the raw water contains that mineral. Back-washing, that is, reversing the normal flow of water through the treatment unit, may be required to remove the iron. Alternately, special additives may be added to the brine to help minimize this condition.
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