Guidance

Water companies: control of chemicals used for dosing at waste water treatment works

Find out about discharge limits and controls for chemical dosing of treated sewage effluents, and when you need to apply to change your environmental permit.

• From: Environment Agency
• Published: 8 May 2018

Documents

Water companies: control of chemicals used for dosing at waste water treatment works

Ref: LIT 10948

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Details

This guide is for water companies who want to carry out chemical dosing at waste water treatment works (WWTW).

The Environment Agency regulates WWTW by assessing the quality of the waste water they discharge against set compliance limits. This guide explains how we set limits and control the substances used for chemical dosing.

This guide covers dosing:

• with iron and aluminium salts
• with polyelectrolytes
• for pH adjustment

Published 8 May 2018