Good practice

Closed-circuit pump cuts water consumption

Closed-circuit pump cuts water consumption
© thaloengsak, #177377942, 2017, source:
Food processing
High cost
Annual saving:
Payback time:
1.5 - 1.6 Year(s)
Resource savings: Water:
2 850 m3 per year, or 95 % of water consumption
Associated cost savings: Water:
Co2 emission reduction:
1.1 tonnes CO2 equivalent per year
Premises and operation areas:
Production processes
Size of company:
Small (less than 50)
Advancement in applying resource efficiency measures:
One off investment:

New tech makes water-saving splash

  • Audit reveals where soft drink-maker was loosing pressure and wasting water
  • Investment in € 10 000 closed-circuit pump slashes water consumption by 95 %  

SNEMBG manufactures and bottles soft drinks and distributes them in the French Antilles and continental France. Partnering with Ademe, the company wanted to cut its production cost and improve efficiency.

Ademe's audit showed that water was costing € 250 000 a year and the technology used to create the vacuum was water-intensive. A liquid ring pump creates vacuum by circulating water through a mechanism. To ensure sufficient vacuum for the process, the water is cooled. When used in an open circuit, water is lost.

After consulting several suppliers, SNEMBG decided to replace its pump with a more efficient closed-circuit model. Water can be recycled to produce vacuum in the pipes.

Key benefits

The new system cost the company € 10 000 but proved worth it, as water consumption could be reduced by 95 %. SNEMBG also set up sub-metering systems to detect water leaks faster.


“Water is an expense that we [have been trying] to reduce for years. We have been able to set up a closed circuit on a pump and the results are very satisfactory on the reduction of consumption and return time of this equipment.” - Sébastien Wadin, Technical Director, SNEMBG

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