Water, the common heritage of humanity, is a rare resource and the challenge of the third millennium.
Treating it to meet a particular application or make it fit for human consumption is one of SFEC's activities.
Specialized in the design, manufacture, installation and maintenance of high-performance water treatment systems (potabilization, filtration, purification, desalination...) SFEC, located in the Lyonnaise region, has built a solid reputation since its creation in 1983. Strengthened by its independence, of its experience and professionalism, the company is present on the national and international market (50% of turnover in export).
The «raw» water that we treat through our facilities comes from different sources : underground (wells, boreholes, catchments, groundwater etc.), superficial (seas, rivers, streams, lakes, rivers, reservoirs etc.) or distribution networks. These waters can be polluted by micro-organisms, substances chemicals, toxic residues… The complexity of the treatment is all the higher as the quality of these waters is poor.
We master a wide range of treatment and disinfection processes including, among other things, softening, sand filtration, ultrafiltration, microfiltration, nanofiltration, reverse osmosis, eléctrodéionization, ultraviolet, ozonation...
It is therefore more than 35 years of experience, references and expertise in the water field that we put at your disposal to respond to your problems and provide you with tailor-made, economically competitive solutions adapted to your needs. applications.
Our Integrated Engineering allows to solve the most complex cases oftreatment in the medical field (dialysis, sterilization, laboratory...), industrial(agribusiness...), or drinking water (public authorities, site facilities, bottling companies...).
Our workshop ensures the Construction on measure of any type of water treatment unit on skid or containerized.
Our service Maintenance - SAV offers you a wide range of maintenance contracts (preventive, curative...) to reduce the risk of breakdown and extend the life of your equipment.
Our service Buy - Negoce has at your disposal a stock of equipment and consumables for immediate availability. It can also provide you at the best price any spare parts of any brands necessary for the proper functioning of your treatment facilities.
Our integrated design office offers a personalized approach that includes both the physico-chemical analysis of the raw water to be treated, as the assessment of customer needs up to the design and sizing of complete drinking water treatment systems.
Each project is studied on a case-by-case basis. Our solutions integrate advanced technologies taking into account the best technical and economic compromise as well as regulatory and environmental constraints.
The objective of our engineers, in the study and general design of each installation, is to provide answers :
...to provide our customers with autonomous, safe, robust, ergonomic and durable SFEC water treatment systems.
Our technicians can also assist you in technical assistance missions or diagnosis of treatment processes. These missions assistance allow our customers to benefit from preventive and corrective recommendations in the design of their treatment systems of current or future water, including the development of specific and adapted innovative solutions. As such, we guarantee you :
Maintenance is the continuity of our job as designer and constructor. It is also a witness to our total involvement in the life of the equipment for domestic and professional customers.
The proximity, flexibility, responsiveness and availability make our company a key player in the field of system maintenance water treatment.
Our offer is available in many facets ranging from simple punctual repair on request to the multi-year preventive and / or corrective maintenance contract, shared, ... in different business sectors (food, community, hospital, pharmaceutical ...).
All our services are carried out in the state of the art, with suitable tools, in compliance with the rules of health and safety.
Different types of Maintenance Contracts :
Electric and pneumatic
Seals for ball valves
Inox steel basket
Inox multi cartridges
Préfiltration (50, 25, 10 µ …)
Filtration (1, 0.22, 0.1 µ …)
Complete sets with accessories
Online Analyzer (Th, Cl, … )
Measuring probe (pH, T°c, …)
To apply freely or respond to an online ad, please download your application file as follows specifying the reference of the ad:
Ultra pure water is the most used utility in laboratories, sterilization units and the
pharmaceutical industry especially for the preparation of the vast majority of drugs.
Moreover, in the hospitals or the care units, the water of the city network requires a physicochemical, bacteriological and endotoxic treatment before being able to be used safely within the framework of the dialysis. Therefore, this treated water strictly complies with the quality standards defined by the Pharmacopée French and European.
The physicochemical, bacteriological and endotoxic treatment of water for medical use controlled by SFEC is an essential process to guarantee water of excellent medical quality and to prevent all risks, immediate or long term..
The design of SFEC treatment systems for medical use has been designed and studied to enable:
There are different categories of water for human consumption : natural mineral waters, spring
waters and public water supplies.
There is today a growing degradation of the quality of raw water by the increase of their pollution (nitrates, pesticides, drug residues, micropollutants of all kinds...) with repercussions on public health.
This is why communities or agro-food industries must today resort to increasingly sophisticated means of treatment and disinfection to obtain water suitable for human consumption.
SFEC is able to offer you complex treatment (multi-barrier) and disinfection systems, implementing several levels of filtration, in order to finally obtain a water of quality answering to the French and European regulations and standards. International agreements on drinking water (Directive européenne 98/83 of 3 novembre 1998, OMS (Organisation Mondiale de la Santé...).
The industry covers a range of extremely variable water uses, both in quantity and quality.
Industrialists use water :
Remarkable solvent, water is also widely used by the chemical industry to wash, dissolve, extract,
synthesize a large number of molecules.
In addition, the growing demands for the protection of resources and the environment combine to impose on industrialists an ever more rigorous management of their water.
To meet all these needs, SFEC offers physical and / or chemical treatments to produce water that does not damage your facilities during its passage and brings you innovative technical responses.
The water treatment systems for medical use that we build are based on an absolute safety philosophy
based on a concept of redundancy.
Indeed, each element is bypassable either manually or in automatic mode. Whatever the malfunction detected by the PLC, the user is immediately informed and the alarm report can be sent back to our service technician..
If an osmosis unit should have a major problem (malfunction of the booster pump), it would be sufficient to acknowledge the alarm and turn a key to automatically actuate a bypass composed of electric valves.
Each part of the process chain is equipped with various sensors whose measured values are all sent back to the PLC. All these measures can be included in a traceability protocol à la carte, which means that it is the user who chooses according to his own criteria the values he wishes to export within a tracing system..
The entire installation is managed by a programmable controller that ensures fully automatic operation of the installation. The different parameters are entered using a user-friendly touch screen. The variety of control variants ensures maximum flexibility and operational safety. All important operating parameters are recorded electronically. Remote monitoring is part of our services. The majority of our installations are equipped with this device that allows us from our headquarters or from any phone jack to connect to your installation, to consult the various operating parameters.
The degree of safety is such that only a break in the supply of water or electricity could completely immobilize the water treatment plant. Indeed, all vital organs are doubled and have forced marches. Even if the automaton of the installation had to have a malfunction, you have a forced march which allows you to finish with peace of mind the current dialysis session.
SFEC processing chains combine several filtration methods that are used together or sequentially. Each method having its favorite target.
The ultra-pure water thus produced responds to a treatment process totally mastered by the SFEC and which comprises several stages :
For heat disinfection, we offer loop ultrafiltration associated with heat disinfection (85°C). These coupled techniques are effective on bacteria and endotoxins. They guarantee water of exceptional quality.
SFEC treatment facilities are ideal for removing cloudy substances, particulates and undesirable
microbiological organisms such as bacteria, viruses and parasites in raw water. Even when turbidity
or microbiological contamination peaks are observed after precipitation, the facilities provide a
uniform quality filtrate without turbidity or pathogens.
A programmable controller provides fully automatic operation of the entire treatment facility. The different parameters are entered using a touch screen. The variety of control variants ensures maximum flexibility and operational safety. Depending on the quality of the raw water used, cleaning as needed can be supported by an optimized addition of chemicals. All important operating parameters are recorded electronically.
SFEC treatment units combine several filtration and / or disinfection methods that are used together or sequentially. Each method having its favorite target.
The drinking water thus produced responds to a treatment process totally controlled by the SFEC, which relies in particular on the following technologies :
The SFEC treatment units for industrial use are dimensioned on a case by case basis and make it
possible to provide concrete and economical solutions to industrialists wishing to produce water
that meets the specificities of their process..
Mounted on freestanding skids or in containers, these units can be adapted to the most dangerous environments (ATEX, ...) and the most severe constraints.
A programmable controller provides fully automatic operation of the entire treatment facility. The different parameters are entered using a touch screen. The variety of control variants ensures maximum flexibility and operational safety. Depending on the quality of the raw water used, cleaning as needed can be supported by an optimized addition of chemicals.
SFEC treatment units combine several filtration and / or disinfection methods that are used together or sequentially. Each method having its favorite target.
The water thus produced responds to a treatment process totally controlled by the SFEC, which relies in particular on the following technologies :
Schema of principle of an industrial softener
Water hardness :
Hardness of water is the sum of the concentrations of calcium ions (Ca2+) and magnésium (Mg2+) responsible for the formation of limestone. The term "hard water" does not concern the potability of water but only its high content of limestone. The higher the water temperature, the more calcium and magnesium ions are incrustating. The limestone remains, during this process, in the form of small crystals causing problems.
The installation of a softener of water makes it possible to obtain a softened water, unloaded ions of calcium and magnesium. Softened water helps remove limescale and protects your facilities and equipment.
Once saturated, the resins must be regenerated. In the majority of cases, the regeneration is carried out using sodium chloride (NaCl). A complete regeneration cycle contains the following phases: backwashing, suctioning, rinsing, filling the salt container. The parameters of each of these cycles are adjustable according to the quality of the water and the desired treatment.
Volumetric or chronometric regeneration :
In the context of a volumetric regeneration the softener counts and records the actual water consumption and gives, when the preset volume is exceeded, the signal of the beginning of the regeneration. This can be immediate or pushed back to a predefined time. After regeneration the counter automatically returns to zero and the device is ready again. In the event of a power failure, all data are saved. In the context of a Chronometric or Chronological regeneration the water softener will perform the regenerations at regular intervals of time, every 2 or 3 days for example. Thus, the resin of the softener is regenerated as a function of time, without knowing if it is saturated with magnesium calcium and therefore without knowing if this is really necessary.
The resins used meet the FDA (Food and Drug Administration) regulations, are approved by the French Ministry of Health and Public Hygiene and have the ISO9002 certification. The dimensioning of softeners is decisive and must guarantee different criteria :
The industrial water softeners that we offer are of high quality and reliability. They find their place in professional uses, to treat large quantities of water (industry, hospitals, communities, etc.). The control valve can be volumetric or chronological, and mechanical or electronic depending on your applications. The choice of the type of valve depends in part on the diameter of the pipe on which the water softener is to be installed.
The softeners proposed by the SFEC have :
Schèma de principe d’un filtre à sable
Exemple de filtre à sable SFEC
Its principle is to cross the water to be treated through a massive consisting of a filter material
(usually a siliceous sand) of a selected particle size. During the passage of water, the fine particles and colloid clusters are retained on the surface of the filtering mass, thus generating a superficial clogging layer which tends to improve the breaking capacity... From a certain loss of load, a phase of retro washing will prevail.
The retro washing phase consists of fluidizing the sand bed by the injection of water and air against the current. The fluidization causes the expansion of the filter media and thus the separation of the particles and the increase of the porosity of the medium. The wash water loaded with these suspended particles is discharged to the sewer. There are three types of sand filtration :
The first two require pumps and the use of chemicals (flocculation principle). A flocculant that
uses a chemical principle to trap suspended solids and particles and form large flakes that will
deposit by sedimentation. (Sedimentation means that suspended particles stop moving and settle).
Slow sand filters use biological processes to clean water, and are non-pressurized systems. They can treat water and reduce the presence of microorganisms (bacteria, viruses, microbes...) without the need for chemicals. They do not require electricity to operate.
The operation of these filters without permanent intervention of the operator is possible thanks to the complete automation of the filtration cycles and backwashing. Each filter is equipped with a clogging measurement and a set of automatic valves (water inlet to be filtered, filtered water outlet, washing water inlet, washing air inlet).
This purification process is ecological and often the most economical in emerging countries. It offers the advantage of high efficiency and simple operation. It responds to the needs for water quality improvement while offering the opportunity to involve the community in the management, maintenance and operation of the facilities... Its ability to simultaneously improve the physical, chemical and bacteriological qualities of raw water represents a considerable advantage over other techniques: that of accessing a satisfactory water quality without adding further in other steps of the purification process.
However, viruses and bacteria can pass through filters, so the final disinfection step is mandatory. Furthermore, under certain circumstances (climate, raw water quality), a proliferation of certain types of algae can cause a rapid clogging of the filter bed and consequently pose operational problems. Increasing the amount of solids suspended in the raw water, as it is more and more frequently observed, requires cleaning at too frequent intervals. Therefore, if the turbidity exceeds 30 NTU for long periods, pre-treatment by decantation, pre-filtration with horizontal or vertical flow, or other types of pretreatment are essential.
The sun emits an invisible light: the ultraviolet (or UV). This natural phenomenon is reproduced
inside the UV treatment devices thanks to powerful lamps, coming from the latest technologies. UV
lamps emit UV-C which has a strong bactericidal, virucidal and algicidal power, recognized for a
Two types of lamps exist: low pressure and high pressure lamps.
These emit higher UV-C powers, about 100 to 150 W UV-C but with lower energy yields. The lifetimes of these lamps are approximately 3000 hours for HP type lamps and 8000 hours for BP type lamps.
A UV treatment apparatus consists of one or more lamps placed in quartz sheaths to be thermally insulated from the water. These lamps can be assembled in a cylindrical tube (closed type device) or in a channel (open type device). In both cases the water circulates in the vicinity of the lamps, in thin layers because the UV rays are rapidly absorbed by the water. The quartz sheaths are confined in a reactor which, depending on the operating pressure, is constructed from stainless steel, hot-dip galvanized steel or high-density polyethylene. The assembly is controlled by an electrical cabinet ensuring the lighting of the lamps, their operation, counting the hours of operation and an alarm indicating a possible malfunction.
The energy consumed by the disinfection varies according to the adsorption of the radiation by the water to be treated (turbidity, presence of metals, organic matter ...) This energy is generally between 15 and 40 Wh per cubic meter of water. treated water.
The efficiency obtained varies between 90 and 99.99% depending on the exposure time of the water to be treated with radiation. The processing capacity of the devices is very large, from a few liters per hour for a single-lamp device to up to 1,000 cubic meters for larger industrial installations. The investment to be made follows the same evolution.
Ultraviolet type C eradicates germs by greatly disrupting cell metabolism (as they enter their DNA) until they are completely destroyed.
Wavelength of sunlight
Example of a UV generator marketed by the SFEC
The key elements of effective ultraviolet disinfection are based on :
The exposure time (the ratio between the size of the tank and the flow drained by the filtration
The energy emitted in micro watts / second / cm² at the furthest distance from the lamp.
By combining the energy emitted by the lamp and the exposure time, the performances will be measured in milijoules (mj).
Advantages and disadvantages :
+ The UV water decontamination system has many advantages. The most interesting is that the disinfection is accompanied by the formation of any reaction product with the organic matter of the water. The use of the apparatus is simple, it is adaptable on a water distribution circuit already in place, its reduced maintenance and its cost of operation is relatively low. And to top it off, UV disinfection is an eco-friendly process that respects the environment.
- These advantages are thwarted by some major disadvantages. There is no possibility of immediately assessing the effectiveness of the treatment by measuring a residual as in the case of a chemical oxidant. There is no residual effect. The use of UV disinfection is therefore reserved for the disinfection of water whose distribution circuit is short and well maintained. Finally, the proper functioning of the apparatus requires a water of good transmittance, that is to say a turbidity less than 1 NTU.
Application areas :
Ozonation is a chemical oxidation treatment. The use of oxidizing chemical reagents for water treatment originally targeted the sterilization of water, or, more accurately, the destruction of pathogenic germs. Ozone has the advantage of allowing complementary actions in the destruction of a large number of micropollutants and in the improvement of tastes, odors and the destruction of colors. Ozone is a molecule with the chemical formula O3. It consists of the chaining of three oxygen atoms, one more than in the case of dioxygen. It is a very unstable gas, which gives it a very important oxidizing capacity. First of all, ozone is created thanks to the ambient air. Indeed, the captured oxygen will pass through an ozone generator where it receives an electric charge. After receiving an electrical charge, some oxygen molecules (O2) will separate to form two independent O atoms. Then these atoms will bind to O2 molecules that have not been split to form ozone molecules (O3).
Ozone is a multifunctional reagent.
It destroys toxic compounds such as cyanides and phenols and attacks natural organic dyes (humic
acids, tannins, lignins ...) and artificial dyes responsible for water coloring.
It selectively reacts with organic compounds in water and transforms them into materials that are
easier to break down by subsequent biological treatment.
In addition, unlike chlorine or chlorine dioxide, ozone does not produce haloforms. It has an
effective and fast action but it has little residual action.
Advantages and disadvantages :
+ Ozone decomposes into oxygen, without leaving any by-products in the water.
+ Ozone is produced on site (no transport of toxic products or consumables to be changed regularly)t.
- La production of ozone consumes energy.
- The system is quite complex.
- Some materials are not resistant to ozone.
- The system requires a significant upfront investment.
There are different types of ozoners :
There are still two kinds of ozoners :
- Low frequency (50 Hz) ozonators with unit production per hour of approximately 1 to 3 kg of ozone.
- Medium-frequency (150 to 600 Hz) ozonators with a unit output of up to 60 Kg per hour. It is in these ozonators that the ozone is produced and injected into a reactor, where the effluent to be treated is also injected..
Before being injected into the water containing the effluent, the gas containing the ozone can
be divided into "micro-bubbles" using various materials :
Porous diffusers arranged in the lower part of the vats or columns. This system has the advantage of not consuming the additional energy and the disadvantage of clogging and aging.
A hydro-injector spraying the gas directly into the driving water at a pressure of 4 to 5 bar. This system has the advantage of a better dissolution rate and the disadvantage of the additional consumption of energy of the driving water pump of the hydro-injector.
The ozone requirement can vary from 2 to 20 g per m3 of water to be treated, depending on the pollutant and its concentration. The electricity consumption is between 20 and 25 Wh per gram of ozone produced. The results obtained speak for themselves: Not only does ozone act on pollutants by improving the transparency of water, it also eliminates iron and manganese, metals that are often responsible for the coloring of water, but it also acts on bacteria. developing in water by eliminating them. Ozone has an important sterilizing power since it has a clear, rapid and radical action on many viruses. Finally, it is a way of eliminating stubborn odors of earth, musty or pharmaceutical without leading to the appearance of tastes as is the case for chlorinated derivatives. Note: it is possible to use coupled techniques (ozone - UV) which have a better efficiency.
Application areas :
Thanks to its excellent qualities of disinfection and oxidation, ozone is enormously used for the treatment of drinking water. Ozone can be used for different purposes in treatment systems, such as for pre-oxidation, intermediate oxidation or final disinfection. Generally, it is recommended to use ozone for pre-oxidation, before an activated carbon filter. After ozonation, these filters can be used to remove the organic matter (important for final disinfection).
Ultrafiltration is based on the principle of the physical barrier traversed by pressurized water and
stopping all elements whose size exceeds a limit value called membrane cutoff threshold..
This technique is used to remove cloudy substances, particles and undesirable microbiological organisms such as germs, bacteria, viruses and parasites present in raw water or when turbidity or microbiological contamination peaks are observed after precipitation.
This process makes it possible to provide pure and crystalline water of uniform quality, without turbidity or pathogens, especially in the treatment of drinking water.
An ultrafiltration module is the basic unit of a membrane filtration system. A module consists of a set of bundles of several thousands of fibers each, protected by grids and secured by 2 resin loaves located at the ends of the module.
Suspended solids suspended by the membrane will slow down the filtration process. They must be removed periodically. This is the process of backwashing. It is done by sending ultrafiltered water against the current and under pressure through the membrane to remove impurities deposited on its wall.
Periodic chemical cleaning may supplement the action of the backwash. These retro chlorinated washings, acid or basic are carried out to thoroughly clean the membrane. Other adjuvants can also be used periodically to automatically regenerate the membrane.
The advantages of ultrafiltration are as follows :
Some examples of areas where ultrafiltration is applied:
Nanofiltration is a technology that produces high quality water through its separation process using
filtration through semi-permeable membranes under pressure. Its principle is very similar to that of
ultrafiltration, the essential difference being that the nanofiltration membrane has a porosity ten
times lower, of the order of 0.001 micrometer.
It makes it possible to retain the micro-pollutants that are the most difficult to eliminate (viruses, bacteria, pesticides, etc.) and almost all the components, be they organic, organic or mineral and whatever their concentration.
The modules used by SFEC are of the tubular or spiral type. Injected under pressure, the water to be treated passes through the membrane and spring filtered through the central tube.
Section of a nanofiltration membrane
Examples of nanofiltration membranes used by the SFEC
The water molecules that cross the membranes constitute what is called permeate. The permeate is a
water that contains only 20 mg/l of sulphates (99% of reduction), 20 mg/l of sodium (92% of
reduction) and a hardness of almost zero...
The water molecules and minerals that have not passed through the membranes are guided by the central tube to the second nanofiltration tube to be filtered again and so on to the end of the chain. The remaining part called the concentrate is discharged out of the production line of drinking water (30% of the water sent on the membranes). Nanofiltration makes it possible to retain the micro-pollutants that are the most difficult to eliminate (viruses, bacteria, pesticides, etc...) and almost all the components organic or mineral and whatever their concentration.
Nanofiltration is a safe technique that eliminates all toxic or undesirable substances resulting from human, industrial, agricultural or natural environment activities. In addition, it also significantly reduces the use of chlorine. Its only drawback lies in the fact that the produced water is so pure that it is necessary to remineralize it. Indeed, it stops some ions like Ca2 +.
Today it is mainly used in water purification processes, such as softening, discoloration, and micro-pollutant removal. In industrial processes nano-filtration is used to remove particular components such as coloring agents.
Other applications of nano-filtration:
Reverse osmosis is a membrane separation technology that uses a membrane system composed of 0.0001 μm pores, through which the water to be treated passes under the effect of a pressure gradient.
Osmosis membranes release 95 to 99% of elements that are not pure water (salts, minerals, nitrates, phosphates, sulphates, pesticides, herbicides, detergents, heavy metals, chemicals, hormones, pharmaceuticals, radioactivity...). The flow is carried out continuously tangentially to the membrane which limits the accumulation on this membrane of the various species (particles, molecules, ions) retained by the latter.
Section of a nanofiltration membrane
Nanofiltration membrane example used by the SFEC
In the reverse osmosis membrane, the water to be treated is divided into two parts of different concentrations :
SFEC reverse osmosis water treatment units require know-how in the selection of equipment (membranes
and reverse osmosis modules) and components that must withstand aggressive water (seawater) and at
high pressure. Depending on the expected efficiency, it can be used either alone or in combination
with other treatment systems.
Attention, the reliability of operation and the life of the reverse osmosis systems depend
essentially on the quality of the pretreatment implemented in the global sector. It is therefore
imperative to ensure that the feed water is properly pretreated to avoid problems of clogging,
precipitation, oxidation and pollution of any kind of osmosis membranes...
Pre-treatment is truly a strategic step that must not be neglected because it is the guarantor of the proper functioning of the reverse osmosis system, and especially it is "life insurance" membranes.
The main applications of reverse osmosis concern :
Parc d'activités "Les Portes du Dauphiné"
51, Rue Ampère
69780 Saint Pierre de Chandieu - France
Tél. : +33(0)4 78 40 20 821
Fax : +33(0)4 78 40 30 17
Mail : email@example.com
SIRET : 32788813700038
APE : 3600Z
Capital : 200 000 euros
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