Cleaning Processes in Food Processing Systems

Cleaning processes in food processing encompass a suite of chemical, mechanical and thermal operations designed to remove residues and ensure hygienic standards across equipment and surfaces. Integral to food safety and operational efficiency, these methods range from cleaning-in-place (CIP) systems that automate detergent circulation through piping and vessels to manual clean-out-of-place (COP) techniques for removable components. Fundamental mechanisms include dissolution of soils by alkaline or enzymatic agents, mechanical shear generated by fluid flow or wash jets, and thermal dislodgement of proteinaceous and lipid deposits. The complexity of food soils—comprising proteins, starches, sugars and fats—necessitates tailored protocols that balance cleaning efficacy with sustainability goals, minimising water, energy and chemical consumption. Recent innovations have targeted sensor-based real-time monitoring, machine-learning algorithms for predictive cleaning schedules and self-cleaning surfaces to reduce downtime and effluent volumes. Globally, robust cleaning strategies underpin regulatory compliance, product quality and the prevention of cross-contamination, driving continual research into greener chemistries, advanced fluid-dynamic measurement techniques and the design of hygienic equipment geometries.

Research from Nature Portfolio

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Research from all publishers

Studies on filter-cake dewatering and washing have highlighted the impact of cake geometry on cleaning performance. Experimental work with inhomogeneous filter cakes revealed that non-uniform cake heights demand greater wash-liquid volumes to attain equivalent purity, underscoring the importance of cake homogeneity in sustainable industrial filtration. Investigations into fats, oils and grease (FOG) wastewater from dishwashers have demonstrated significant transformations of fatty acids, generating very long-chain saturated species that contribute to sewer blockages if not adequately removed; dishwashers were found to fragment FOG into smaller particles than handwashing, suggesting criteria for improved grease interceptor design. A comprehensive review of model food soils has provided a framework for selecting representative proteinaceous, starchy, sugary and lipid-rich deposits in bench-scale cleaning studies. By evaluating measurement techniques, fouling formulations and cleaning mechanisms, this work has established standardised model systems that facilitate the optimisation of cleaning protocols and the transfer of findings across diverse food sectors.

Cleaning Processes in Food Processing Systems publication trend

The graph below shows the total number of articles in cleaning processes in food processing systems across all publications each year (not limited to Nature Index journals).

Technical terms

Cleaning-in-place (CIP): An automated process that circulates cleaning fluids through fixed pipelines and vessels without disassembly.

Fouling: The accumulation of food residues (proteins, fats, starches) on equipment surfaces, impeding hygiene and performance.

Shear stress: Tangential force per unit area exerted by flowing fluid on a surface, critical for mechanical removal of soils.

Displacement washing: A cleaning strategy in which contaminated fluid is progressively replaced by fresh wash solution to sweep away residues.

Filter cake: A consolidated layer of particulate or colloidal material retained on a filtration medium during solid–liquid separation.

References

1. Experimental study on mechanical dewatering and displacement washing of filter cakes with inhomogeneous cake geometry. Separation and Purification Technology (2024).
2. Fat, oil and grease wastewater and dishwashers: Uncovering the link to FOG deposition. The Science of The Total Environment (2023).
3. Model food soils for investigating cleaning: A review. Food and Bioproducts Processing (2022).
4. Intelligent Industrial Cleaning: A Multi-Sensor Approach Utilising Machine Learning-Based Regression. Sensors (2020).
5. Design and complexity evaluation of a self-cleaning heat exchanger. International Journal of Heat and Mass Transfer (2022).