Ferric Chloride Tanks, whilst commonly used as an etching agent during the production of electronic circuit boards, is predominantly used in the water industry as a flocculant during wastewater treatment.  During the past 15 years, the use of ferric chloride in treating drinking water has become increasingly popular as significant improvements to product quality and decreased cost driving this increased use in ferric chloride.

Ferric chloride is one of the purest and most concentrated forms of iron commercially available for drinking water treatment with its unique functions as a reactant to remove impurities from the water acting as a coagulant and flocculent.

Ferric chloride provides drinking water treatment operations in the following benefits:

  • It is extremely effective in removing high and low turbidity
  • Removes colour and discolouration
  • It works over a wide pH range
  • Requires a lower dosage than other sulphate-based coagulants
  • It is available at low cost
  • Creates a heavier flock that settles faster and works better in cold water
  • Produces higher sludge concentrations. This means decreased sludge disposal costs.
  • The high iron content sludge produced is not considered hazardous to the environment. It is compatible and beneficial with many land application residual programs.

Ferric chloride is one of the main chemicals used for wastewater odour control and in many cases treatment plants vent through an odour scrubber that has the ferrous chloride in it to remove the hydrogen sulphide.  It is free flowing liquid that can remain stable for indefinite periods. Ferrous chloride is also used to dechlorinate water before discharging effluent.

Other uses of ferrous chloride in wastewater treatment include:

  • Precipitating and removing phosphates
  • Eliminating sulphide-based odours
  • Reducing arsenic and mercury
  • Reducing hexavalent chrome
  • Controlling struvite
  • Adjusting pH

Ferrous chloride is a hazardous substance that must be handled and stored properly as it is highly corrosive and can irritate and burn the skin. Breathing the chemical can irritate the nose and throat, and repeated exposure may cause nausea and gastrointestinal damage.

While ferric chloride offers a versatile, cost-effective solution to drinking water treatment, it does present storage challenges.  These bunded tanks for ferric chloride are offered with chemical tank options including liquid level sensor assemblies, and fill pipes, fittings and modifications to suit your application.  This includes inlets, outlets, PN16 and ANSI flanges, welded sockets and as well as fume proof lids and vents.

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