Eric Wright Water

Corwen Wastewater Treatment Works (WwTW)

Introduction

Corwen Wastewater Treatment Works (WwTW) is required to meet a new total phosphorus discharge limit. Dŵr Cymru Welsh Water (DCWW) assessed the necessary upgrades to ensure compliance.

Client

Eric Wright Water

Sector/ Project Type

Water Companies - WwTW

Date

2025

Location

Corwen, Denbighshire

Our Approach

The project team undertook a comprehensive review of the existing WwTW infrastructure and identified key areas for intervention.

The approach focused on upgrading inlet works, optimising chemical dosing, improving settlement processes, and enhancing instrumentation. Ground investigations and flood risk assessments were integral to the design, ensuring robust and resilient solutions for site-specific challenges.

The Solutions

Major interventions include:

Replacing outdated inlet equipment with a new band screen and wash-water system.
Installing a pumped main with electromagnetic flowmeter and static mixer for ferric sulphate dosing.
Constructing new primary and humus settlement tanks.
Upgrading final effluent monitoring and sampling.
Providing new sludge holding tanks-MCC kiosk, and overall site pipework.
Relocating welfare cabins and elevating critical infrastructure to mitigate flood risk.
Designing piled foundations for new tanks based on ground conditions.

Project Outcome

The proposed works will enable Corwen WwTW to reliably achieve the phosphorus limit, improve operational efficiency, and enhance environmental protection.

The design addresses hydraulic and structural challenges, ensures compliance with regulatory standards, and future-proofs the site against flooding and ground conditions.

Our Work