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What Are the Standard Operating Procedures for Odour Management in Food Factories?
Overview
Begin with odour source identification. Check production areas, floor drains, grease traps, waste storage, raw-material areas, ETP tanks, sludge storage and exhaust points.
Remove food residue before it decomposes. Floors, drains, equipment and waste containers need cleaning frequencies based on how quickly organic material collects.
Keep wet food waste in suitable closed containers and move it out according to the factory’s waste-handling schedule.
Include the ETP in routine odour monitoring. Settled organic solids and oxygen-poor conditions can produce hydrogen sulphide and other unpleasant compounds.
Record odour incidents by location, time, intensity, suspected source and action taken. Repeated incidents from one location need investigation.
Where source correction cannot fully control airborne odour, suitable treatment may be installed around the affected zone. The method must fit the production environment and contamination controls.
A bad smell near a food factory drain can be an early warning. Food residue may be collecting inside the drainage line. Waste may have remained in a bin too long. An ETP tank may have developed oxygen-poor zones where organic matter has started to decompose.
Spraying fragrance over the area does not correct any of these conditions.
Good odour management in food factories starts by finding where the smell comes from, correcting the cause where possible and checking whether it returns. The standard operating procedure (SOP) should make this routine part of factory housekeeping, waste handling and wastewater management.
Table of Contents
Here are the steps you should follow:
SOP Step 1: Find the Source Before Treating the Smell
The first rule of food factory odour management is simple: find the source.
Walk through the plant and mark places where organic material, wastewater or process emissions can produce smells. Typical inspection points include receiving areas, processing equipment, floor drains, grease traps, waste bins, waste rooms, wastewater channels, equalisation tanks and sludge storage.
Different smells can point towards different problems. A rotten-egg smell may indicate hydrogen sulphide. Sour smells can develop where food residues ferment. Protein-rich fish, meat and poultry waste can produce amines and other strong-smelling compounds during decomposition.
For anyone asking how to identify odour sources in a food factory, do not inspect only where people notice the smell. Air movement can carry odour away from its actual source.
Record the strongest location and trace it back towards drains, waste, wastewater or processing equipment.
SOP Step 2: Stop Food Residue from Sitting Too Long
One of the most useful odour prevention measures is removing organic material before decomposition produces a persistent smell.
Food residue left beneath machinery, inside drain channels or around waste containers can become an odour source. Warm and wet conditions make the problem worse.
The cleaning SOP should state:
Which areas require cleaning during production and after each shift
Who checks drains and difficult-to-reach areas
How spills and dropped food are collected
When grease traps are inspected and cleaned
Where removed residue must be placed
Cleaning records should identify missed areas rather than simply state that a room was cleaned.
SOP Step 3: Control Food Waste from Collection to Removal
Food waste odour often becomes noticeable when organic waste stays warm, wet and exposed.
Waste containers should be suitable for the material, kept closed where practical and cleaned after emptying. The area around each container also needs attention because leaked liquid can remain after the solid waste has been removed.
Factories handling meat, fish, dairy, starch, fruit or other rapidly decomposing materials may need shorter waste-removal intervals.
Good food industry odour control therefore includes the entire waste route: where waste first leaves production, how it is transported, where it waits and when it leaves the site.
SOP Step 4: Include Drains in the Daily Inspection
Drains are easy to miss because most of the contamination sits below floor level.
Food particles, fats and organic sludge can collect inside drain channels and traps. If material remains there, cleaning the visible floor will not remove the source.
For odour control in food processing plants, drain inspection should cover grates, channels, traps and accessible sections of the drainage line.
Repeated smell from a recently cleaned drain needs investigation. The cause may be deeper in the line, in a trap, or further downstream.
This is one reason odour management procedures should record recurring locations instead of treating each complaint as a separate event.
SOP Step 5: Check the ETP When Odour Appears
The ETP is another major area for industrial odour management.
Food-processing wastewater often contains biodegradable organic material. When solids settle and remain under oxygen-poor conditions, decomposition can produce hydrogen sulphide, ammonia, mercaptans, organic acids and other odorous compounds.
A documented case from a 300 KLD potato starch ETP in Punjab reported high-TSS wastewater and settled organic matter creating anaerobic zones, with odours associated with ammonia, hydrogen sulphide, mercaptans and other compounds.
Routine wastewater odour control should therefore include checks of equalisation tanks, sludge holding areas and other points where organic material can accumulate.
Operators should investigate the ETP process problem as well as treating odour in the surrounding air.
SOP Step 6: Use Odour Treatment at the Correct Location
Source correction should come first, but some food factories still need atmospheric odour treatment around waste areas, ETPs or processing zones.
Amalgam Biotech’s OdoServe Odour Control is intended to neutralise airborne malodour rather than cover it with fragrance. It can be applied through misting, spraying or fogging systems depending on the site.
For ETPs, Amalgam also supplies OdoServe EOC, which is designed for dosing into wastewater to act on hydrogen sulphide and mercaptans.
Production rooms require another consideration: moisture.
Amalgam’s D-VOC dry vapour method uses OdoServe without introducing misting water into the production area. This can be considered in food, meat and fish processing areas where additional humidity or water droplets are undesirable.
The choice between wastewater dosing, outdoor misting and dry vapour should follow odour source identification rather than applying the same method throughout the factory.
SOP Step 7: Set Up an Odour Monitoring Record
You cannot judge odour management in food factories from one inspection.
Create an odour monitoring log containing the date, time, location, type of smell, intensity, weather conditions where relevant, suspected source, corrective action and follow-up result.
Also record complaints from employees or people outside the site. Repeated complaints at similar times may point towards a production activity, waste collection period or ETP operating condition.
The purpose is to find patterns.
If odour repeatedly appears after sludge handling, for example, that activity deserves its own control procedure.
SOP Step 8: Investigate Repeat Odour Instead of Increasing Fragrance
Persistent smell means the source still exists or the existing control is not treating it properly.
This is especially important for industrial odour management. Simply increasing fragrance can hide the warning signs of waste decomposition, poor drainage or ETP trouble.
Food-industry BAT guidance does not recommend adding perfumed substances simply to mask odour.
When a problem returns, repeat the inspection and review cleaning frequency, waste holding time, drainage condition, wastewater operation and the position of any odour-control equipment.
How Can Food Factories Prevent Odour Problems?
For factories asking how can food factories prevent odour problems, prevention depends mainly on controlling organic material before it decomposes.
Remove food residues promptly, clean drains, control waste storage, prevent wastewater solids from remaining stagnant and inspect the ETP routinely.
These odour prevention measures should be written into normal factory procedures rather than introduced only after a complaint.
Conclusion
Effective food factory odour management is built around a repeatable routine: locate the source, remove or correct it, apply suitable treatment where needed and check whether the smell returns.
For facilities that still have odour around ETPs, waste zones or production areas after source controls are in place, Amalgam Biotech’s odour control range includes OdoServe atmospheric treatment, ETP dosing products and dry vapour systems for areas where added moisture is unsuitable.
The treatment method should always match the source. A drain problem needs drain attention. An ETP problem needs ETP investigation. Air treatment belongs where odorous compounds remain after practical source controls have been applied.
Frequently Asked Questions
1. What causes foul odour in food processing plants?
For anyone asking what causes foul odour in food processing plants, common causes include decomposing food residue, wet organic waste, dirty drains, fats and proteins, wastewater and settled ETP sludge. The exact compounds depend on the material and conditions.
2. How to manage odour in food processing factories?
When deciding how to manage odour in food processing factories, locate the source first. Correct cleaning, waste, drainage or wastewater problems and then use suitable odour treatment where emissions remain.
3. What are the standard operating procedures for odour management in food factories?
The answer to what are the standard operating procedures for odour management in food factories includes source inspection, cleaning, drain checks, waste handling, ETP inspection, suitable odour treatment, record keeping and follow-up checks.
4. Why is wastewater odour common in food factories?
Food wastewater can contain high amounts of biodegradable organic matter. Settled solids and oxygen-poor conditions can allow compounds such as hydrogen sulphide and ammonia to form, making wastewater odour control an important part of factory management.
5. Can odour neutralisers replace cleaning and waste management?
No. Odour treatment can act on airborne or wastewater odour compounds, depending on the method used, but it does not replace cleaning, waste removal, drain maintenance or correction of ETP problems.
Control Odour at Every Stage of Your Food Factory
Prevent recurring odour problems by addressing their source in drains, waste storage, ETPs and processing areas. Explore Amalgam Biotech’s odour control solutions to find a suitable approach for your factory’s specific needs.
