The Project


An accidental release of milk at a nearby dairy processing plant resulted in an emergency call-out for Adler and Allan Oxygen Depletion response service. The milk entered the drainage system and ended up in a nearby lake populated by protected wildlife. The pollutants had reduced oxygen levels in the watercourse to a critical level within days of the incident.

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The Solution


Adler and Allan recommended a fast and effective injection of oxygen to relieve aquatic life in the watercourse. Our response team deployed a combination of five aeration systems to alleviate the effect of the environmental incident. This consisted of three splash aeration units capable of throwing up to 3200 litres of water per minute and one of the most efficient machines available at transferring oxygen in fresh water; and two air injectors which provide very high levels of oxygenation by introducing air using the venturi principle. Huge volumes of air are drawn from the atmosphere and injected below the water surface in the form of millions of tiny bubbles.

The aeration units resulted in the oxygen levels increasing from below 10% to above 70% within 24 hours of deployment. Dosing the watercourse with hydrogen peroxide would have been an alternative method but wasn’t used in this instance. Hydrogen peroxide produces a rapid and effective method of increasing oxygen levels in water bodies where there has been contamination to a watercourse. It is useful in controlling algae and bacterial growth for open water swimming and immersion sports.

Oxygen depletion of lakes, rivers and ponds can occur in a number of circumstances; also known as ‘oxygen crash’ the main contributors are pollution events and/or low water levels, particularly from droughts. Oxygen depletion happens in aquatic environments as dissolved oxygen becomes reduced in concentration endangering aquatic organisms living in the system. Fish can be seen hanging at the water surface, sometimes gulping air. Aeration is required to raise oxygen levels once depletion has been detected. This can be achieved by deployment of mechanical aeration devices or by the addition of hydrogen peroxide under controlled conditions.

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The Outcome


The works were completed to the full satisfaction of the client.