Carrig on Bannow

Due to the very high effluent standard we decided to use a sequential batch reactor (SBR) type plant. A similar plant was installed in Aughrim for Wicklow County Council in 2000.

The plant was designed to facilitate an easy doubling of capacity. The plant can be upgraded easily by simply installing an additional reactor.

The ultimate receiving water is Bannow Bay (with oyster and mussel beds). Chlorine is dosed for disinfection. A flocculent is dosed to achieve the phosphate standards.

The system consists of:

• Inlet works with flow measurement and 6mm screen, bypass channel and manual coarse screen.
• Inlet sump c/w two submersible pumps.
• Reactor tank c/w floating turbine.
• Sludge storage tank with decanting mechanism.
• An access platform was provided to permit easy access to the reactor and sludge tanks.
• Outlet tanks to attenuate flow as there is a low flow in the receiving waters.
• Control house for Form 4 control panels, separate toilet/shower room, dosing pumproom c/w chemical storage.
• The control room is fitted with burglar and fire alarms.

An important feature of the control room is the provision of an Endress & Hauser memograph. This records and displays the key process parameters. This enables the plant operator to review plant performance when the site is unattended. This is essential in the event of a problem. The memograph can be monitored remotely or data stored on a disk. This is essential in the event of a problem as historical data for two months can be reviewed. A PLC normally does not store any useful historical data. A plant mimic is also provided to assist the operator to understand the process and any fault alarms that may arise.

We carried out all civil works within the site fence and all mechanical and electrical work.

Defects period expired: Summer 2006

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