Technical Summary
Flow rate: 30,000 m³/h
Industry: Pet food production
Technology: PC-2 Two-stage packed column wet scrubber (acid stage + caustic-oxidative stage)
Target pollutants: Amines, organic vapours, fatty acids, oil aerosols
Process air characteristics: Emissions from extrusion, drying, coating and cooling phases
Acid and caustic-oxidative stages designed around operational maintenance windows
Air Pollution Control for Pet Food Production requires alignment between scrubber architecture and factory operating schedule.
Application context
This Air Pollution and Odour Control system was designed to treat up to 30,000 m³/h of process air generated by a dry pet food production line operating on a single 8-hour shift.
Air is extracted from the complete production cycle:
The emission profile includes:
Although airflow is relatively stable, contaminant concentration varies according to recipe formulation and coating intensity.
Why a packed-only solution was selected
Packed column scrubbers are often considered structurally limited in pet food applications because of oil mist deposition on the first stage packing.
However, this limitation becomes critical only when production schedules do not allow regular maintenance.
In this specific case, the production line operates on a single daily shift, providing predictable downtime. This makes it possible to:
The engineering decision was therefore based on operational rhythm, not on catalogue standardisation.
In this case, Air Pollution Control for Pet Food Production is based on predictable maintenance cycles rather than continuous elastic operation.
System architecture
The installed configuration consists of two separate packed columns, operating sequentially:
First stage – Acid
Designed to neutralise amines and stabilise odour load.
Second stage – Caustic-oxidative scrubber
Designed to complete neutralisation and improve robustness against residual organic compounds.
The physical separation between stages allows:
This architecture remains structurally simple while ensuring staged treatment.
This configuration was selected as a structured Air Pollution Control for Pet Food Production strategy aligned with the plant’s operating rhythm.
Operational reality: fouling as a managed parameter
In pet food production, oil aerosols generated during coating inevitably deposit on internal surfaces.
In packed towers, the first stage becomes the primary deposition surface.
Consequences over time may include:
In this installation, these effects are not treated as unexpected faults but as predictable phenomena integrated into the maintenance strategy.
Because the factory does not operate continuously, the system remains viable and economically rational.
Engineering positioning
A two-stage packed column system can be an effective Air Pollution and Odour Control solution for pet food production up to 30,000 m³/h — provided that:
Where these conditions exist, a packed-only architecture remains technically sound.
Where production shifts increase or variability intensifies, reaction dynamics and fouling management require a different approach — which led to a more efficient evolution.
When to choose a two-stage packed column scrubber
Air Pollution Control for Pet Food Production can effectively rely on a two-stage packed column architecture when production operates on limited daily shifts and structured maintenance windows are available. In these conditions, oil mist deposition on the first stage packing can be managed through scheduled cleaning without compromising long-term stability. Where continuous three-shift production is required, reaction dynamics and fouling accumulation demand more elastic configurations.
