

CASS™ - Cyclic Activated Sludge System

Location: Muir of Ord, Scotland
Client: North of Scotland Water Authority
Type: Municipal Wastewater Treatment Facility
Value: £1.0M Lump Sum Turnkey Contract
Date: Commissioned May 2001
Project Description:
The project comprises the design, construction, procurement and commissioning of a new 6,300 p.e. wastewater treatment plant for the town of Muir of Ord to meet European UWWTD and Bathing Water / Bathing Beach legislation. The project provides increased environmental quality to the Moray Firth and local bathing beaches.
Features of the project include a new inlet pumping station and preliminary treatment with 6mm screening and grit removal, storm tank, two 16 m diameter CASS™ SBR process basins (with removable aeration grids), sludge thickening and storage, and fully automated plant controls (telemetry, PLC / MCC control).
Design Flow: 1.1 MGD (4,163 m3/d)
Influent Conditions: BOD 88 mg/L, SS 102 mg/L, TKN 17 mg/L, NH3-N 11 mg/L, P 3 mg/L
Effluent Limits: BOD 20 mg/L, TSS 30 mg/L as 95%ile spot samples
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