---
url: https://www.eurocovers.eu/solutions/odor-emission-control
title: Odor and emission control for wastewater and digesters
description: Cap H₂S, VOC and odor emissions from wastewater plants and biogas digesters by 90%+ with modular floating covers. EU compliance ready.
updated: 2026-05-25
---

# Odor and emission control for wastewater and digesters

Cap H₂S, VOC and odor emissions from wastewater plants and biogas digesters by 90%+ with modular floating covers. EU compliance ready.

Modular hexagonal covers reduce odor and emission release from wastewater, digesters, and process
water by 90%+ — supporting EU Industrial Emissions Directive compliance and reducing community complaints.

## What is odor and emission control?

**Odor and emission control** for industrial water means reducing the release of volatile
compounds — primarily H₂S (hydrogen sulfide), VOCs (volatile organic compounds), ammonia, and
methane — from the water surface to the surrounding air. Wastewater plants, anaerobic digesters,
food processing, oil and gas processing, and biogas operations all generate measurable emissions
at the water-air interface.

## How odor and emission control via covers works

A modular hexagonal cover reduces emission release through:

- **Physical barrier** — the cover blocks direct mass transfer at the water-air interface.
- **Reduced air turbulence** — covered water bodies have lower air motion at the surface, slowing dispersion.
- **Headspace equilibration** — the headspace under the cover saturates, reducing the driving gradient.

For full emission *capture* (methane recovery on digesters), a continuous geomembrane variant is
appropriate. For *reduction* of odor and VOC release, modular covers achieve 90%+ reduction.

## Benefits

| Metric | Value |
|---|---|
| Odor reduction | 90%+ |
| H₂S capture | 85–95% |
| VOC capture | 70–85% |
| Lifecycle | 25+ years |
| Maintenance | Visual inspection only |

## When to use odor and emission control covers

- Wastewater treatment plants subject to community complaint pressure
- Anaerobic digesters (odor reduction or methane capture)
- Food and beverage processing with high BOD/COD loadings
- Oil and gas produced-water management
- Any operation reporting under EU Industrial Emissions Directive

## Related solutions

- [Evaporation control](/solutions/evaporation-control)
- [Algae prevention](/solutions/algae-prevention)
- [Hexprotect® AQUA product page](/products/hexprotect-aqua)

## The authentic patented engineering

EuroCover Water Systems distributes the **original AWTT-patented hexagonal floating cover
line** — the original Hexprotect® was patented by AWTT (first of its kind, granted 2010),
and the pre-ballasted, one-piece moulded Hexprotect® AQUA variant has been in commercial
service since 2009 and validated for sustained operation on wastewater, biogas, and
industrial process water. The patented design tolerates the dynamic conditions of
operational ponds without anchors. See [/heritage](/heritage) for the patent and validation
chain.