Coagulants are used for treatment of all kinds of water
Coagulation is the oldest known water treatment method
In industry, coagulants are frequently used for water treatment
In drinking water production, coagulants remove particles, humic substances and colour
Coagulants produce healthy and enjoyable drinking water
Coagulants are used for treatment of all kinds of water

REACH is a European regulation which deals with the Registration, Evaluation, Authorisation and Restriction of Chemical substances. Although REACH came into force on 1 June 2007, registration of substances did not start until 2010. This process should be completed by 2018.

To help European chemical producers meet their REACH obligations, Cefic established a dedicated group called ReachCentrum in 2006. Through their expertise, the ReachCentrum team are able to help INCOPA’s members navigate the REACH registration process. Producers of inorganic coagulants are covered by ReachCentrum’s Aluminium and Iron Salts REACH Consortium (known as AlFe).

The AlFe REACH Consortium registered 11 Joint Submissions before 1 December 2010. The submissions included classification and labelling proposals and a joint chemical safety report template.

One of the provisions of REACH is the Community Rolling Action Plan (CoRAP). Substances added to the CoRAP list are evaluated by a member state over a period of three years to determine their toxicity and whether restrictions are needed on the labelling or use of the substance. For example, aluminium sulfate has been added to the REACH CoRAP list and the substance will be reviewed by the French authorities by 2015. INCOPA has a task force in place to prepare for this review.

Applications

Industrial Uses
For industry, coagulants provide a method of reusing water in a cost-effective way that does not comprise the industrial process.
Paper Industry
Inorganic coagulants are used in two critical parts of the paper production process: sizing and retention.
Waste Water
To ensure the water does no harm to people or the environment when it is released, waste water must be treated to reduce the level of contaminants to acceptable levels.
Other Applications
In addition to their role as inorganic coagulants, aluminium and iron salts are used in many other applications.
Drinking Water
In order to protect our health, all drinking water must be cleared of pathogens and impurities before it is used.

FAQs

How do inorganic coagulants work?

Coagulants have a positive electrical charge. By contrast, particles which are dissolved or suspended in water typically have a negative charge. The positive charge of the inorganic coagulant neutralises the negative charge of the particle and the two bind together (coagulate) in larger particles in a process known as flocculation.

These larger particles (known as floc) are heavy and quickly settle to the bottom of the water in a process called sedimentation. Lighter flocs can be removed from the water using filters. Different coagulants target different types of particles in the water.

 

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