pH Correction Solution Provided for Concrete Works at Water Treatment Facility

Project Overview

As part of an ongoing project to upgrade a water treatment site in south England, Tilbury Douglas needed to accommodate consolidating solids and preventing run-off liquids arising from concrete structure works. In order to treat the high pH water caused by the washout of concrete delivery trucks, Tilbury Douglas approached RVT for a safe and sustainable solution.

Challenge

Wash water resulting from concrete washouts is alkaline, containing high levels of chromium, which can contaminate groundwater, migrate to storm drains and increase the pH of area waters. Solids that are improperly disposed of can cause flooding.

To avoid polluting the local water systems, and to remain compliant with Environmental Permitting, Tilbury Douglas required a suitable washout solution to minimise the environmental impact of both solids and wash water caused by the concrete works. Tilbury Douglas approached RVT to
provide a solution that ensured there was no risk of contamination to the water treatment site.

Solution

RVT provided an EnviroHub Concrete Washout Kit comprising of the EnviroHub CW01 Concrete Washout Unit and the EnviroHub TT01 Concrete Water Treatment Unit. This combination used heavy duty geotextile filter bags to separate the aggregate and silt which could then be used as
backfill or disposed of safely. The remaining wash water that had seeped through the filter bags in the washout unit, was then automatically pumped into the adjacent treatment tank for pH correction. In the tank, the alkaline water was then dosed with CO2 to neutralise pH levels which allowed for its safe disposal.

This kit guaranteed the upgrade project for the water treatment site continued safely, whilst minimising the environmental impact of necessary concrete works. EnviroHub solutions provided by RVT ensured compliance with authorities such as the Environment Agency and the Water board’s site water standards requirements.

“We have used the RVT Envirohub for concrete washout on our site for 14 weeks and have found it easy to set up and use. It has been simple to reduce the pH to a safe level and then reuse the water for the next wagon. We have used less water overall, probably only around 1m³. And the treated water is much easier and cheaper to dispose of legally than untreated cementitious water would have been. “ - Senior Engineer, Tilbury Douglas

What can Envirohub do for you?

• EnviroHub is a modular system, allowing you to first discuss requirements with a consultant and then select the kit that is suitable for your site’s specific needs.
• EnviroHub is easy to use, reducing the burden or stress that site managers can feel when managing water on site.
• Envirohub helps to ensure compliance with environmental regulations, giving you peace of mind that you have protected the environment.
• Envirohub is fully flexible, allowing you to neutralise water using CO₂ vapour gas or chemicals.
• Customers are supported throughout every step of the hire, receiving technical support & consultations whenever necessary.