Case Study
Efficient solutions for sewage treatment
Problem
An energy efficient new sewage plant was needed to cater for additional demand. The system would need to be able to adapt pumping to different demands ensuring energy saving speed control and low noise operation.
Solution
Operating in closed loop PID control, the level of dissolved oxygen is constantly monitored and the blower output automatically controlled by the Optidrive Eco to maintain a target value. Optidrive Eco variable frequency drives are fitted to control pumping speeds on the variable torque pumps, providing energy saving speed control and low noise operation.
EPS LIMITED
Longwood is a small rural village which has had a significant increase in population. Its close proximity to the capital city of Dublin makes it an excellent base for commuting. As a result, the existing sewage treatment facilities were no longer capable of coping with the increased population and new improved facilities were required.
EPS Ltd was chosen to undertake the task, due to their proven experience and expertise in the water and waste water treatment industry. EPS's primary consideration for the plant was to offer a cost effective, efficient solution, whilst also minimising audible noise.
The plant uses the latest technology in defused air water treatment, with Optidrive Eco units chosen to drive the constant torque blower units. Operating in closed loop PID control, the level of dissolved oxygen is constantly monitored, and the blower output automatically controlled by the Optidrive Eco to maintain a target value.
Optidrive Eco variable frequency drives are fitted to control pumping speeds on the variable torque pumps, providing energy saving speed control and low noise operation.
A total of 10 inverters are utilised, each drive capable of automatic operation with manual 'hand' override where required.
Invertek Optidrive units were chosen because they offer extremely simple set up, allowing the system to be commissioned quickly and efficiently, whilst maintaining all the flexibility of control required in this application.
This is now just one of a growing number of sites throughout Ireland where EPS have used Invertek Optidrive VFDs successfully.
