Overview
PFAS are synthetic compounds that barely break down in the environment and are now regulated in drinking water in many countries. Granular activated carbon is one of the main technologies used to remove them. Longer-chain PFAS adsorb strongly, while shorter-chain compounds break through sooner, so systems are designed and monitored carefully.
How it works
- Water flows through granular carbon vessels, often two in series (lead and lag).
- PFAS adsorb onto the carbon.
- Water is sampled between vessels to detect breakthrough.
- Exhausted carbon is replaced and treated at high temperature, which can destroy the captured PFAS.
Why coconut shell
Coconut-based carbons are one of several options for PFAS treatment; the best grade depends on the PFAS mix and the water chemistry.
This page describes activated carbon in general. Suitability for a specific use depends on the activated carbon grade and the system it is used in.