The Cotton Valley Water Recycling Centre (WRC) serves a population of approximately 2.57 million in the Milton Keynes area. Dewatering Sewage is the process that follows Sewage Screening, Aeration and the removal of Return Activated Sludge and Surplus Activated Sludge.
To increase the capacity and efficiency of the plant, upgrading of the specialized equipment used in this process was implemented calling for the requirement of a new fully integrated control system.
Paktronic Engineering (under their MCC Framework Agreement) were tasked by Anglian Water to design, manufacture and install a Motor Control Centre (MCC) that fulfilled all requirements.
This was no ordinary task, the MCC needed to be multi-functional and use intelligent design for control of the Ethernet connected inverters and I/O devices. Specialist speed and vibration monitoring was also provided for protection of the centrifuges.
This was achieved by programming and integrating 2 individual ICA Sections for Centrifuge No. 1 & No. 2 with the MCC Main ICA Section.
Each Centrifuge has Bowl Drive controls and Scroll Drive controls with their own supporting HMI. In addition to this, Sludge Feed pumps and Poly Dosing pumps are controlled.
The MCC is built up from 5 main sections – measuring overall 10400mm L x 2300mm H x 800mm D
Sections:
- Mains Incomer and various Feeds
- Centrifuge No.1 Controls & individual ICA
- Centrifuge No.2 Controls & individual ICA
- Controls for Centrifuge No.1 Sludge Feed Pump, Centrifuge No.2 Sludge Feed Pump, Centrifuge No.1 Poly Dosing Pump & Centrifuge No.2 Poly Dosing Pump
- Controls for Centrifuge No.1 Transfer Conveyors, Centrifuge No.2 Transfer Conveyors & Main MCC ICA
Employing the latest PLC and HMI technologies our inhouse software engineers created the necessary programing to read all incoming signals from numerous sensors and health monitors (pump and motor) to ensure full automation of the process.
Paktronic’s high level of expertise and dedication ensured that the customer’s expectations were exceeded.
The final output of the dewatering process provides a useful waste product that can be used in several industries, particularly soil conditioning and fertilizer production.