Hydecat TD process Johnson Matthey Hydecat reaction profile Johnson Matthey
The process consists of a multi-bed catalyst reactor through which the effluent passes.


  • Able to reduce any inlet concentration of hypochlorite to any required outlet concentration.
  • The most environmentally acceptable option, as the only by-products are salt and water, as opposed to chemical destruction.
  • Can also reduce VOCs in final effluent.
The diagram above shows the destruction profile for hypochlorite through each bed of a five bed system over a period of 5 years. Towards the end of the run, the performance of the unit can be improved to meet final effluent specifications by increasing the temperature (T)
HYDECAT PD process Johnson Matthey HYDECAT ID process Johnson Matthey
Partial, or bulk destruction, with a multi-bed HYDECAT reactor retrofitted before an existing chemical treatment for polishing offers a number of advantages:
  • Potentially much cheaper running costs than chemical destruction alone.
In certain cases a single-bed HYDECAT reactor can be used, which gives minimum capital investment with rapid pay-back in possibly only a few months.
  • Robust and simple.
  • Typically used for retrofit, when a chemical destruction system already exists.

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