Application of Self-Cleaning Filters in Process Water for a Mexican Food Processing Plant

2026-05-27

I. Customer Background

A large food processing company in Mexico, primarily engaged in the production of canned fruits and vegetables. The plant requires a significant amount of process water for washing, blanching, and transporting fruits and vegetables. The water source is local municipal supply, but aging pipelines often result in the presence of sediment, rust, and a small amount of plant fiber in the water. If these impurities are not removed in time, they can adhere to the surface of the final product, affecting its appearance and quality.

II. Customer Pain Points

The food processing plant previously used stainless steel basket filters, which presented multiple problems. The basket filters required manual removal and cleaning of the filter baskets, at least four to five times per day. Each cleaning required a 30-minute shutdown, disrupting continuous production. Incomplete cleaning of the filter baskets allowed impurities to re-enter the pipeline, leading to small spots on some product surfaces and an increase in customer complaints. Additionally, production line workers frequently came into contact with dirty filter screens, raising hygiene concerns. The plant’s equipment manager clearly stated the need for a fully automatic filtration solution requiring no manual cleaning, with equipment materials meeting food-contact grade requirements.

III. Solution

Ultimately, we recommended a self-cleaning filter, with certain parameters adapted to meet customer requirements. The filter housing diameter is DN250, with an outer diameter of 273 mm. The housing is made of SS304 stainless steel with a sandblasted finish, resulting in a smooth, easy-to-clean surface. The filter element is a 50-micron wedge wire screen made of SS304, capable of intercepting sediment and fine fibers in the fruit and vegetable wash water. Seals are made of FKM (Viton), which is temperature-resistant and meets food contact safety requirements. The cleaning mechanism is an internal scraper design, with the scraper also made of 304 stainless steel, operating online to remove impurities from the filter screen surface. The inlet/outlet size is DN50 flange, conforming to DIN standards, perfectly matching the customer's existing piping. The blowdown port size is DN100, equipped with an electric ball valve and utilizing a downward blowdown method, discharging impurities directly into the plant's wastewater collection tank. The design pressure is 1.0 MPa, fully meeting the plant's water supply system pressure requirements. Control is managed by a PLC with a large LCD display.

IV. Results

The equipment has been in operation for over five months, with excellent customer feedback. In terms of filtration precision, the 50-micron wedge wire screen effectively intercepts most sediment and fibers, leaving the downstream process water clear and transparent, and eliminating impurity spots on product surfaces. Regarding operating costs, the equipment runs fully automatically, eliminating the need for workers to frequently clean filter baskets, saving approximately two hours of labor per day, allowing them to focus on core production processes. In terms of hygiene, the closed stainless steel housing and automatic blowdown design prevent workers from directly contacting contaminants, successfully passing the customer’s internal hygiene audit. Regarding reliability, the equipment has operated continuously for five months without any failures, and the FKM seals show no signs of aging or leakage. For blowdown, the large-diameter DN100 blowdown valve requires only 3–5 seconds per discharge, ensuring thorough impurity removal with very low water consumption—only about 10 liters per cleaning cycle.

V. Customization Note

The equipment parameters in this case study can be customized according to actual customer operating conditions, including housing diameter, filtration precision, inlet/outlet connection standards, seal materials, auxiliary cleaning logic, and more. If you have similar water treatment or liquid filtration needs, please provide your operating parameters, and we will design a tailored solution for you.