Dairy reference project
Up to 90 % permeate yield compared to fresh water use

In order to optimise water consumption, a dairy in Finland has selected a compact reverse osmosis system from Herco. The integrated concentrate recovery stage achieves a permeate yield of 90 %.

Project requirement

The Valio dairy in Finland was seeking a reliable and resource-saving solution for treating surface water. The aim was to provide fully demineralised water for cleaning the production facilities. Due to the limited space available in the technical facilities, the system had to have a particularly compact design. In addition, a high level of energy efficiency was required in order to reduce operating costs in the long term.

Herco solution

Herco has developed a space-saving, compact reverse osmosis system with an integrated hygienic design. The system achieves a permeate yield of up to 90 % due to the concentrate recovery stage (2× 12.5 m³/h). The use of frequency-controlled pumps reduces energy consumption by up to 50 %. The Siemens S7 control system with Profinet interface enables seamless integration into the higher-level control system and ensures largely automated operation with minimal operating effort.

System technology

• Source: surface water

• Capacity: 2× 50 m³/h in alternating operation

• Concentrate recovery: 2× 12,5 m³/h

• Material: completely stainless steel, low dead space design (hygienic design)

• Control system: Siemens S7 with Profinet

• Chemical dosing

• CIP tank, hot sterilisable

• Frequency-controlled pumps (FU)

• Interfaces for ZLT connection

• Blending device for hardness adjustment

Amortisation period from 1 year compared to single-stage UO systems.
Up to 50 % energy savings through the use of frequency converter pumps.
Up to 90 % permeate yield compared to the use of fresh water.