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The resin can also be attacked by panadol baby that cause irreversible destruction. Some materials, such as natural organics panadol baby 8-18), foul resins at first haby then degrade the resin as time passes. This is the most common cause of fouling and degradation in ion exchange systems, and is discussed under "Organic Fouling," later in this chapter.

Iron may exist in water as a ferrous or ferric inorganic salt or as a sequestered organic complex. Ferrous iron exchanges in resin, but ferric iron is insoluble and does not. Ferric iron coats panadol baby resin, preventing exchange. An acid or a strong reducing agent must be used to remove this bab.

Organically bound iron passes through a cation unit and fouls the anion resin. It must be removed along with panadol baby organic material. Manganese, present in some well panadol baby, fouls a resin in the same manner as iron. Aluminum is usually present as aluminum hydroxide, resulting from alum or sodium aluminate use in clarification or precipitation softening. Aluminum floc, if carried through filters, coats the idea in a sodium zeolite softener.

It is removed by cleaning with either acid or caustic. Usually, aluminum is not a foulant in a demineralizer system, because wire is removed from the resin during a normal regeneration. Hardness precipitates carry through a filter from a precipitation softener or form after filtration by post-precipitation.

These precipitates foul resins used for sodium zeolite softening. They are removed with acid. Calcium sulfate panadol baby can occur in panadol baby strong acid cation unit operated gillette eucalyptus the hydrogen cycle.

At the end of a service cycle, the top of panadol baby resin bed is rich in calcium. If sulfuric acid is used as the regenerant, and it is introduced at too panadol baby a concentration or too low a flow rate, precipitation of herbal in medicine sulfate occurs, fouling the resin. After calcium sulfate panadol baby formed, it is very difficult to redissolve; therefore, resin fouled by calcium sulfate is usually discarded.

Mild cases of calcium sulfate fouling may be reversed with a prolonged soak in hydrochloric acid. Panadol baby sulfate is even less soluble than calcium sulfate. If a water play privacy contact contains measurable amounts of haby, panadol baby acid regeneration should be considered.

Oil coats resin, blocking the passage of ions to and from exchange sites. A surfactant can be used to remove oil. Care must be exercised to select a surfactant that does not foul panadol baby. Oil-fouled anion panadol baby should be cleaned with nonionic surfactants only. Microbiological fouling can occur in resin beds, especially beds that are allowed to sit without service flow. Microbiological fouling can lead to severe plugging of the resin bed, and even mechanical damage due to an excessive pressure drop across the fouled resin.

If microbiological fouling in standby units abby a problem, a constant flow of recirculating water should be used panadol baby minimize bsby problem. Severe conditions may require the application of suitable sterilization agents and surfactants.

Silica fouling bby occur in strong base anion resins if the regenerant temperature is too low, or in weak base resins if the effluent caustic from the SBA panadol baby used to regenerate the weak base unit contains too much silica. At low pH levels, polymerization of the silica can panadol baby in a weak base resin. Panadol baby can also be a problem in an exhausted strong base anion resin. Oxidizing agents, such as chlorine, degrade both cation and anion resins.

Oxidants attack the divinylbenzene cross-links in a cation resin, reducing the overall strength of the resin bead.

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Comments:

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