Bourgogne-Franche-Comté Region, France Ile-de-France Region, France

District heating system

Treated using conventional agents, this 5,000 m3 (1.3-million-gallon) closed network ended up getting clogged. The rollout of our ODYTHERM FS510P solution, combined with an appropriate treatment and operating methodology, was able to stabilize a network with substantial deviations, eliminating all of its issues.

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Equipment Client challenge ODYSSEE’s solution Results
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District heating system with two boilers. Combined heat and power generation.

Materials present Steel / Copper / Stainless steel
Pre-project volume 5,000 m3 (1,300,000 gallons)
Post-project volume 8,000 m3 (2,080,000 gallons)
Generating capacity > 150 MW
Make-up water Softened public water: approx. 800 m3 (208,000 gallons)/year

Client challenge

Treated conventionally, with a base of phosphate/sulfites, the networks ended up heavily clogged:

  • Magnetizable suspended matter + deposits
  • Significant signs of corrosion (iron): > 60 ppm
  • Difficulty maintaining stable parameters in the circuit (mineral conditioning with PO4/SO32-, in particular)
  • Contaminated with sulfate-reducing bacteria (SRB).

Given the substantial deviations reported and the criticality of the circuit, the strategy in place needed to be reassessed.

An eco-friendly final solution was necessary.

ODYSSEE’s solution

  • Permanent stoppage of phosphate-based products
  • Gradual application of ODYTHERM FS510P, according to a switchover protocol designed in combination with in-line ODYNET/ODYCLEAR filters
  • ODYTHERM FS510P: a formula containing only organic active agents (film-forming amines)
  • Installation of a protective continuous monomolecular film mediating between the circuit’s components and the circulating liquid, to prevent corrosion
  • Improved heat transfers (clean surfaces)
  • Passivation of matter (pH 9-10)



Sharp drops in iron content, ending with values of < 0.05 ppm


Gradual water clarification

Bacterial contamination control

Disappearance of SRB – no recontamination unless biocide is added

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