Project Profile

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


Return to Scotland Installations

Return to Europe Installations

Return to Installation List

Return to Home Page


©2006 Earth Tech Inc.