CFG Services, making geothermics simple. A subsidiary of the BRGM.

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Industrial microbiology

In order to avoid any malfunction related to the proliferation of micro-organisms facilities and their possible consequences, CFG Services assists its customers in diagnosing problems and implementing solutions for combating the micro-organisms. This expertise covers many fields: water circuits (drinking and thermal water), irrigation water, ultra-pure water, cooling water, water boreholes and their surface installations, industrial circuits and underground storage facilities.

Microbiologie industrielle

Analytical study of skin development in one immersed pump and into a shallow low temperature geothermal well, induced by iron ochre muds (2014)

Goal : understand the hydrodynamics, chemical and bacteriological processes leading to well productivity decrease and to the hydraulic pump shutdown.

  • Drilling of 31m of depth, perforated casing in PVC. Water is produced from the grey chalk with flint aquifer.
  • Understanding of the hydrodynamic phenomena (variation of the water level) characterizing the  near wellbore from lithological composition, well completion and from performed well tests and from operating conditions.
  • Geothermal water analyses : physico-chemical parameters dissolved and total iron, main cations and anions.
  • Analyses on the ochre deposit taken from the hydraulic of the pump : numeration of sulfato-reducing bacteria (SRB) and thiosulfato-reducing (TRB), microscopical examination of iron bacteria (Sphaerotilus, Leptothrix and Gallionella).
  • Crystallized phases deposits analyses by X-ray diffraction.
  • Remedial treatment : muds drilling cleaning procedure, new well completion, new critical exploitation rates estimation and recommendations for energy transfer geothermal systems exploitation, for heating and/or air conditioning systems, to avoid iron oxidizing bacteria proliferation.

Caption : skin development on slots of the PVC casing by iron oxidizing bacteria Gallionella.

Sanitary technical audit of Cooling Towers water with respect to the Legionella risk (2005)

Goal: to make the installation safe by identifying the causes of legionella contamination in order to define remedies and preventive measures.

  • Assessing the existing facilities: installation, operating and maintenance conditions
  • Defining the analytical protocols for measuring the legionella content
  • Proposals for changes to the installations so as to prevent the development of bacterial microflora. Modifications to the operating instructions
  • Defining an antibacterial treatment
  • Defining anti-corrosion treatments

Microbiological assistance in the execution and equipment of a -500 m borehole for ANDRA (“Agence Nationale de Gestion des Déchets Radioactifs”: the French National Agency for Radioactive Waste Management) since 2005

Goal : In-situ analysis of the activity of micro-organisms in the Callovo-Oxfordian argillites.

  • Microbiological monitoring of the experimental boreholes located at the boundary between the Meuse and Haute Marne department – Bure underground research laboratory
  • Implementing defined microbiological precautions for carrying out experimental boreholes
  • Preventing bacterial contamination of the interstitial water in the Callovo-Oxfordian argillites
  • Monitoring experiments

Microbiological characterisation of clay and borehole water at the Tournemire site for the “Institut de Radioprotection et de Sûreté Nucléaire” (the French Institute for Radiation Protection and Nuclear Safety) (2004)

Goal: to identify the bacterial groups responsible for modifying the chemical composition of the interstitial water of the underground clay layers.

  • Sulphate-reducing bacteria (SRB) count
  • Thiosulphate-reducing bacteria (TRB) count
  • Total viable facultative aero/anaerobic bacteria count
  • Total viable obligately and facultative anaerobic bacteria count
  • Measurement physical and chemical parameters

Drafting the general procedures for managing non-compliances in the parameters of water intended for human consumption (2003)

Goal : to create, for a French company specialising in nuclear power, a data sheet for each criterion of the water's suitability for drinking to help make decisions about its non-compliance

  • Analysing decree no. 2001 – 1220 of December 20th, 2001 on water intended for human consumption, excluding natural mineral waters
  • Assessing the parameters to be measured for declaring water suitable for drinking
  • Creating a data sheet for each parameter mentioning the quality limits and the quality references according to decree no .2001-1220
  • Drawing up procedures for managing non-compliances

March 2018

Geothermal breakfasts in The Netherlands…

The first edition of the geothermal breakfasts in The Netherlands took place on march 20th 2018 at the French Embassy located in the Hague. Organized with the great help of Business…

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3, avenue Claude Guillemin - B.P. 46429 - 45064 Orléans Cedex 2 / France
Tel. 33(0)2 38 64 31 22 - Fax 33(0)2 38 64 32 83