The report excerpt below illustrates the level of savings we can achieve. It covers three sites and is drawn from an initial study and follow up visit at each site.

Case Study 1

Identified and repaired fault on the unloading valves of two of the blowers.  These valves were not closing resulting in the blower delivery flow being vented to atmosphere.

Identified that all the blowers were running at the wrong speed due to incorrect pulleys being fitted and arranged for the correct pulleys to be fitted.

Identified fault on the control system of Tank 2, which prevented the assist blower shutting down at low demand and organised the repair.

Identified that the belt drives and tensioning system on the blowers were inadequate and causing excessive torsional vibration.  The controls were modified so that the blowers could be run safely.  It was subsequently identified that the wrong motor mounting plates had been fitted.   

Total energy savings equating to 393,120kWhr per year have been achieved from these actions.

Case Study 2

Identified that the control DO meter on MBBR Tank A was reading much lower than the actual DO of 6 – 7mg/l.  The flow to this Tank was over 2,500Nm3/hr higher than the other tanks.   The meter has been calibrated and the flow is now the same as the other tanks.  

This has produced energy savings equating to 604,440kWhr per year.

Case Study 3

Identified and reduced the leakage from the passing drain trap on the aeration pipework.  This has produced energy savings equating to 10,580kWhr per year. Early into the investigation the control system was changed such that the one of blowers would shut down during periods of low demand.  

This has produced estimated energy savings equating to 450,000kWhr per year


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