Partech (Electronics) Ltd.

Why it is important to measure Dissolved Oxygen in aeration lanes


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Dissolved Oxygen is a key parameter in the efficient treatment of waste water during the secondary treatment stage; the point at which organic waste is oxidised to form carbon dioxide, water and nitrogen compounds.

It is important to act on accurate measurements of Dissolved Oxygen in activated sludge plants for the following reasons:

  • To maintain levels of bacterial activity
  • To avoid breaches in discharge consents
  • To minimise operational costs and help run plants as cost effectively as possible

The bacterial balance

Bacteria plays an important role in aeration lanes and under the right conditions, bacteria and organisms use Dissolved Oxygen to break down organic material into carbon dioxide, water and energy, clearing the water of harmful substances.

An efficient aeration process relies on close control of Dissolved Oxygen levels. Under ideal conditions Dissolved Oxygen levels should be maintained at between 1.5ppm to 2ppm. Too little Dissolved Oxygen can lead to bacterial inactivity and ineffective treatment, whilst too much Dissolved Oxygen wastes energy and can cause unnecessary wear and tear to aeration systems – it’s essential to get the balance right!

Instruments to measure Dissolved Oxygen

Various methods can be used to measure Dissolved Oxygen. Partech offer fixed and portable options. Our sensors make accurate Dissolved Oxygen measurement easy, they are highly reliable and accurate as well as straightforward to use and easy to install. They benefit from the self cleaning action of the FlexTech mounting shaft and the fouling tolerance of the probes themselves, as well as a built in temperature sensor for additional monitoring and accurate compensation, all of which means longer service intervals and a consistently more efficient plant.

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