SUEZ Advanced Solutions UK

Electrochemical Wastewater Treatment: Electrocoagulation, Electrooxidation , Electroperoxi-coagulation

SUEZ’s unique range of Electrochemical technologies is composed of 3 patented solutions, that can work together or separately, depending on your water quality needs: Electrocoagulation, Electrooxidation and Electroperoxicoagulation. These techniques allow the treatment of industrial waste waters and find their real advantage on difficult waters. Electrochemical technologies are effective in the oil industry, chemical, pharmaceutical, metallurgical, automotive, residues (landfill leachates), food and beverage and concentrate recovery and others.

Electrocoagulation is an electrochemical process with the same principle as conventional coagulation.

The main innovation is that the coagulant is generated in situ by means of the electrolytic oxidation of the anode (iron or aluminium) which is sacrificed, so that it is not necessary to add other salts.

Electrocoagulation is designed to eliminate:

  • Suspended material  and colloids
  • Heavy metals
    Phosphorus and phoshates
  • Nitrogen
  • Phenols
  • Oil, emulsions and hydrocarbons
  • Cyanides
  • PCBs
  • Pesticides, herbicides and fungicides
  • Bacteria, viruses and parasites
  • Colour and odour
  • Toxicity

Advantages over conventional coagulation:

  • Removes multiple contaminants
  • Suppression of most of the chemicals
  • Less production of sludge
  • Inert and easy sludge dewatering
  • Less operational costs
  • More compact installations
  • Easy maintenance

Electrooxidation is an electrochemical process in which oxidation reactions occur by applying an electric field between the anode and cathode, it is designed to offer complete oxidation of all organic compounds (including persistent and toxic components) and ammonium in water.

In this process the anode is usually titanium based and it is coated with noble metals sintered. These materials have catalytic properties which allow the oxidation of the pollutants, either by direct contact with the anode, or by oxidation in the media.
The new design and special sintered electrodes offer very long life and show a higher oxidation capacity than other advanced oxida¬tion technologies. It also allows the disinfection of treated water “in situ” and the reuse of treated water is possible
The application of this technique mainly causes the removal of:

  • Soluble organic matter
  • Volatile or semi-volatile Hydrocarbons
  • Many of persistent organic compounds
  • Colour and odour
  • Nitrogen compounds (nitrate, ammonia)
  • Free cyanide and inorganic cyanohydrins
  • Treated water disinfection
  • Specific toxins: CN, pesticides, herbicides, PCBs, phenols, fungicides.
  • Active pharmaceutical compounds: oestrogen, cortisone, antibiotics, EDCs
  • Elimination of bacteria, viruses and parasites
  • BTEX and PAHs
  • Sulphides, thiols and amines

Once the water has gone through this process it is transparent, odourless and colourless, and may be suitable for other use.
Advantages over alternative technologies:

  • Low operation costs and maintenance requirements
  • No consumption of chemicals
  • No production of sludge
  • Compact installations/Operation on demand (“on/off”)
  • Reduce potable/process water consumption and discharge cost

Electroperoxicoagulation is based on the electrocoagulation process.

The main difference with this technology is that simultaneously the Fe2+ is generated in the anode (sacrificial) and it reacts with the contaminants and the hydrogen peroxide, dosed or produced at the cathode. In this process a Fenton reaction occurs, generating highly oxidizing environment, degrading dissolved organic compounds and ammonia.

Advantages over alternative Fenton technologies:

  • High efficiency to oxidise bio-refractory compounds, thus treating persistent refractory COD that other processes are unable to treat.
  • H2O2 consumption is much lower

The application of this technique mainly causes the removal of:

  • Pharmaceutical compounds
  • Carcinogenic products and compounds
  • Radioisotopes
  • Anilines and nitrogen compounds
  • Landfill leachate
  • Wastewater from methanisation 

Electroperoxicoagulation is also an alternative to hazardous waste disposal, as it is a cost competitive treatment for liquid waste that should be disposed as hazardous waste in landfills or incinerated.

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