IndustryFood Production

CategoryWastewater Treatment

CompletedSafely, on time and budget

errigal bay seafood

Project Description

Errigal Bay Seafood, Meenaneary, Carrick, Co. Donegal, as part of their drive to prepare for expansion, sustainability, and environmental standards, required to upgrade and improve the performance (particularly in terms of the nutrient removal capabilities) of their existing Wastewater Treatment Plant (WwTP)

In conjunction with Udaras Na Gaeltacht, they commissioned WEW Engineering to carry out a survey and assessment of the WwTP and prepare a report identifying the upgrade options required to ensure compliance with increasingly strict nutrient discharge limits.

The required capacity and quality needs were identified as follows:



The existing WwTP was configured as a standard Activated Sludge (AS) Plant which while capable of providing high-quality effluent was very much capacity limited in terms of nutrient removal to meet the tighter discharge limits. The existing Plant incorporated the following unit operations:

  • Inlet Screening
  • pH Correction
  • Balancing and Equalisation
  • Single Stage Aeration System
  • Secondary Clarification
  • Chemical Phosphorous Reduction
  • RAS/EAS sludge Pumping
  • Sludge Thickening and Dewatering

Having been engaged initially to provide a report on upgrade options subsequently, WEW Engineering undertook the roll of full Engineering Procurement and Construction Management (EPCM) Service Providers for the Project, where we developed the detailed design and engineering requirements. Asset and condition surveys were carried out on the existing Plant, including process assessment, tankage, pumping, mechanical and electrical plant and equipment.

water treatment

Project Scope

  • Site appraisals, assessment of existing assets
  • Process selection study and report
  • Preparation of process and instrumentation Diagrams (P&ID’s)
  • Full process, mechanical and ICA design
  • Preparation of detailed drawings and tender documents
  • Full Procurement Services (incl. Tender evaluation)
  • Duties of PSDP & PSCS
  • Full construction management and site supervision
  • Technical support up to commissioning and handover

The upgrade of the existing plant incorporating the following:

  • New Anoxic Tank and Splitter Chamber
  • New Fine Bubble Diffused Aeration (FBDA) system (inc Air Blowers)
  • New Final Clarifier
  • MLSS and RAS/EAS Recycle Pumping
  • New Flocculation/Mixing tanks
  • New Tertiary MicroScreen System
  • New Electrics including MCC and VSD Drives
  • New PLC/HMI Plant Control System

Projects Outcomes

WEW Engineering acted as EPCM Consultant, in conjunction with O’ Donnell Brothers Ltd for Civil works, McDevitt Engineering Ltd for Mechanical works, CSL Ltd for Electrical works and ICA. The Plant upgrade was completed and commissioned on schedule with successful biological nutrient removal being achieved, and limits met despite the seasonal load and temperature variations. Enabling the Client to pursue sustainability and reduction of their environmental impact, while continuing to grow the business and expand the product range

waste water treatment plant

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