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Application · Sludge processing

Control odors from sludge processing

Apply the AirShield to treat odor mixtures of H₂S, NH3, and VOCs in a single system
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For wastewater operators, asset managers and process technologists responsible for sludge treatment
The odor challenge

Why sludge processing creates complex odors

01

Sludge is stored and thickened

Storage and thickening can release a mixture of volatile sulfur compounds into the air.
02

Sludge is processed and digested

Digestion creates free NH3, amines and other volatile nitrogen compounds
03

Sludge is dewatered and transferred

Handling of dewatered sludge releases a complex mix of sulfur, nitrogen and organic compounds
04

Extracted air needs treatment

Captured exhaust air combines changing loads and multiple odor-causing compounds.
Conventional treatment

Conventional systems fail to remove all odor compounds

Biofilters and carbon struggle with sulfur compounds, humidity and peak loads.

THE AIRSHIELD APPROACH

All-in-one treatment of complex sludge odor

An electric, multi-step process to treat mixtures of sulfur, nitrogen and organic odor-causing compounds

  1. Condensing airDesigned for humid and condensing exhaust air
  2. Odor spikesGuards against odor spikes with automatic cleaning regulation
  3. Limited spaceA compact unit connected to site extraction and electricity
AirShield One being lowered into position at a wastewater facility
AirShield One being positioned at a wastewater facility.

RESULTS FROM SLUDGE PROCESSING

Validated field performance

Field applications show robust odor removal

WWTP UTRECHT · TOTAL ODOR

99.5%

Total odor reduction

77 ouₑ/m³ at the outlet

AirShield inlet after the existing lava filters: 14,000 ouₑ/m³. Final outlet: 77 ouₑ/m³. Odor-panel measurements by Olfasense, March 2025.

WWTP Farmsum · Odor-causing compounds

Below detection

Peak H2S removal

Below detection

Outlet ammonia at 10 ppm inlet

Removal of full mix of key odor compounds

Simultaneous inlet/outlet measurements · Electrochemical H2S sensors · Kitagawa detector tubes

Discuss your application
Assess the fit for your sludge process
Tell us about your case and we will make an assessment
01
Share your situation and available data
02
We review the technical fit and provide indicative costs
03
Agree on next steps

Request a site assessment

A short description is enough to start. Complete airflow and concentration data are not required for a first conversation.

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