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COPOTERM

WATER TREATMENT AND METAL RECOVERY COPOLYMERS

COPOLYMERES POUR LE TRAITEMENT DES EAUX ET LA RECUPERATION DES METAUX

ANR EcoTech Project 2009 | ANR-09-ECOT-005

May 2010 – September 2014

The aim of the COPOTERM project was to implement a water treatment process based on smart polymers for heavy metals removal and recovery from industrial wastewaters. Within the scope of this project, thermosensitive polymers bearing phosphonic acid moieties were synthesized and used for the implementation of an innovative water treatment process named the thermosensitive polymer enhanced filtration (TEF) process.

COPOTERM

WATER TREATMENT AND METAL RECOVERY COPOLYMERS

COPOLYMERES POUR LE TRAITEMENT DES EAUX ET LA RECUPERATION DES METAUX

ANR EcoTech Project 2009 | ANR-09-ECOT-005

May 2010 – September 2014

The aim of the COPOTERM project was to implement a water treatment process based on smart polymers for heavy metals removal and recovery from industrial wastewaters. Within the scope of this project, thermosensitive polymers bearing phosphonic acid moieties were synthesized and used for the implementation of an innovative water treatment process named the thermosensitive polymer enhanced filtration (TEF) process.

thermosensitive polymer filtration copoterm project

Thermosensitive polymer Enhanced Filtration (TEF) process

The phosphonic acid groups enable high sorption capacities for multi-component solutions (Ca2+, Ni2+, Cd2+and Al3+), while the thermosensitive behavior of the polymer allows, for temperatures higher than its lower critical solution temperature (LCST) (25.6 °C) to obtain non soluble copolymer–cations particles.

Thermosensitive polymers are a class of “smart” materials that have the ability to respond to a change in temperature. Such polymers are uncommon as they are soluble in water at low temperature and become non-soluble when the temperature is increased. The change of thermosensitive polymer physical state occurs at the LCST and depends on the polymer chemical structure and its interaction with water. Below the LCST, the presence of hydrogen bonds between polymer and water and the creation of salvation cages (clathrates) result in a low enthalpy of mixing. In this case, polymer-water interactions are stronger than polymer-polymer interactions, and thus the polymer is soluble in water. Increasing the temperature above the LCST makes the hydrogen bonds break and favor the release of water from the polymer chains. Both enthalpy and entropy of mixing increase and polymer–polymer interactions become dominant compared to polymer-water interactions that lead to loss of solubility.

In the presence of aluminium, which was shown to have simultaneous coagulation and neutralization actions, these particles form aggregates that were easily removed by conventional filtration, leading to a lower energetic separation process compared with the well-known polymer enhanced ultrafiltration (PEUF) Process.

Related R&D products from our portfolio

MAPC1 ME

DAAmEP

DMAAmEP

N-Propyl methacrylamide

Poly(NiPAAm-stat-MAPC1 Acid)

Our partners in COPOTERM project