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Ammonia Derived DO Control

This revolutionary way of controlling the aeration process has been developed by Air Technology into a workable process control system. It has been trialled at a number of sites around the UK and the energy saving potential has been exceptional as illustrated by the graph below.

Air Technology has, over the last 6 years designed, developed and installed Ammonia derived DO set point control in approximately 15 aeration plants ranging in size from 10,000 PE to 350,000 PE. The types of aeration systems with this technology include jet aeration, fine bubbled diffused aeration, horizontal and vertical mechanical aeration.

This newly developed system utilises Ammonia probes installed within the aeration plant at various points to monitor the loading on the plant and then determines the required amount of dissolved oxygen required to treat the sewage to the customers standard.

This system results in reduced operation of over treatment of the sewage at low load periods and gives the added benefit of being able to respond to any unusually high loading before the load actually reaches the aeration system, this can help prevent any compliance issues and also can save up to 25% in energy compared to a standard dissolved oxygen control system with even greater savings possible on older crude control systems based on low / high DO level control with inefficient aeration technology. Most of the installed systems have been retrofitted to existing control systems which reduces payback times significantly due to the reduced capital cost.

There are also many other advantages of using Ammonia control technology including the ability to create extended anoxic zones to utilise the oxygen within the return activated sludge by way of nitrate removal, load shedding software is also included for periods of high energy costs / tariffs and generally the treatment system operates at increased efficiency and reliability with less sludge bulking in the final settlement tanks due to the avoidance of denitrification.

With aeration systems using approximately 60% of a standard wastewater treatment sites energy then the usefulness of this technology is clear.

Air Technology has identified and achieved savings to date of £1.4 Million in energy across UK wastewater companies. This represents a reduction of 9,000tonnes of CO2.

To discuss this technology further and find out how this could be incorporated into your Aeration plants please contact our team on 01509 264900 who would be glad to discuss your requirements and provide any additional information or visit you personally at site if required.