Max Wright Ltd - Thickener Dosing plant for the erradication of the Cryptosporidium Bug

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Thickener Dosing plant for the erradication of the Cryptosporidium Bug

An existing water treatment works situated in the North West of Great Britain has been refurbished and upgraded. The main reason for the refurbishment was to eliminate the possibility of a Cryptosporidium Bug outbreak. The Motor Control Centre shown here was supplied and installed as the main process control panel for the Thickening and Dosing Plant on this site. The Panel consists of two parts, a Motor Control Centre and an Instrument Control and Automation section. As the name suggests the ICA controls the motor function via the starters within the Motor Control Centre, it contains an Allen Bradley SLC500 PLC that is connected to a DH+(Data Highway +) network, including existing SATT PLC's and other new SLC500 PLC's monitoring and controlling other parts of the plant.

The PLC's in these systems are connected to a RSview32 SCADA system (Supervisory Control And Data Acquisition) supplied and programmed by Max Wright Systems & Software, this SCADA system covers the whole site, incorporating control and monitoring of new and old plant on one system.

The image below is of the Instrument Control and Automation section of the panel which is connected to the right hand side of the main MCC.

Below are two of the satellite panels, a number of which are distributed throughout the site. The panel to the left is a simple trace-heating panel which maintains the temperature of the sodium hydroxide chemicals within the plant; this is necessary to stop the system freezing during cold weather. The Control Panel to the right is a Fill Point Panel, these are situated at the various chemical fill point stations and monitor the flow of delivered chemicals to the storage vessel safely and efficiently.