WO2018146268A1

WO2018146268A1 - Method and apparatus for cleaning and disinfection of conduits

Info

Publication number: WO2018146268A1
Application number: PCT/EP2018/053321
Authority: WO
Inventors: Matthew Stephenson; Tim DEANS; Bruno Heiniger
Original assignee: Suez Groupe
Priority date: 2017-02-10
Filing date: 2018-02-09
Publication date: 2018-08-16

Abstract

A method for cleaning a fluid flow conduit comprising: a clearing step causing a clearing body which spans the conduit interior to pass along inside the conduit, wherein the clearing body is a flowable agglomerate mass comprising frozen particles and a non-gelled wetting liquid, which comprises a melt derived from the frozen particles and by means of which the particles cohere, and a disinfection step of injecting a disinfection media into said conduit.

Description

METHOD AND APPARATUS FOR CLEANING AND DISINFECTION

OF CONDUITS

FIELD OF THE INVENTION

[0001] This invention relates to a method for the cleaning of the interior of a fluid flow conduit, in particular pipes and tubes.

[0002] In particular, the invention relates to a method for clearing and disinfection of fluid flow conduits wherein biofilms have been formed or might have been formed. TECHNICAL BACKGROUD

[0003] A biofilm is any group of microorganisms such as cells, bacteria, fungi or algae, in which microorganisms stick to each other and often adhere to a surface. These adherent microorganisms are frequently embedded within a self-produced matrix of extracellular polymeric substance (EPS). Biofilm extracellular polymeric substance, which is also referred to as slime (although not everything described as slime is a biofilm), is a polymeric conglomeration generally composed of extracellular DNA, proteins, and polysaccharides. Biofilms may form on living or non-living surfaces and can be prevalent in natural, industrial and hospital settings. The microbial cells growing in a biofilm are physiologically distinct from planktonic cells of the same organism, which, by contrast, are single cells that may float or swim in a liquid medium. Biofilms often resist classic disinfection methods and are a major concern in a wide range of industry. In particular they can be formed from standing water or in a porous solid, for example resulting from food or cosmetics residues. [0004] They are particularly present in fluid-flow conduits of processing machinery for beauty/hair products and beauty/hair components, such as, but not limited to, mascaras, shampoos, conditioners, soap.

[0005] However, they can be present in other fields such as process machinery for food products and food components, oil and gas industry, nuclear industry, food&beverage industry, pharmaceutical industry, chemical industry, paint and coating industry and any industry wherein disinfection of pipes would be needed as well as in drinking water networks and sewers of cities and communities.

[0006] There is thus a need for cleaning-up fluid flow conduits such as destroying biofilms and microorganisms.

SUMMARY OF THE INVENTION

[0007] The present invention relates to a method for cleaning a fluid flow conduit comprising:

- a clearing step causing a clearing body which spans the conduit interior to pass along inside the conduit, wherein the clearing body is a flowable agglomerate mass comprising frozen particles and a non-gelled wetting liquid, which comprises a melt derived from the frozen particles and by means of which the particles cohere, and

- a disinfection step of injecting a disinfection media into said conduit.

[0008] This method allows for a synergetic effect between the clearing step and the disinfection step in order to provide an optimal cleaning of biofilms in fluid-flow conduits. Indeed, the clearing step mechanically scrubs biofilms while the disinfection step chemically or physically attacks microorganisms of these biofilms. Preferably, the disinfection agent is ozone.

[0009] According to non-limiting embodiments, the above method can comprise one or more of the following additional characteristics as follows and as described in reference to figure 1.

[0010] The present invention also relates to a method of clearing the interior of a fluid flow conduit, by causing a clearing body which spans the conduit interior to pass along inside the conduit, wherein the body is a flowable agglomerate mass comprising hard solid frozen particles and a non-gelled wetting liquid, which comprises a melt derived from the frozen particles and by means of which the particles cohere, wherein at least the non-gelled wetting liquid comprises a disinfection agent. For example, the disinfection agent is ozone or chlorine.

[0011] Such a method allows to enhance the clearing effect of the clearing body by the disinfection agent, in order to clear conduits comprising biofilms where an extended disinfection is not required.

DETAILED DESCRIPTION

[0012] Figure 1 discloses a summary chart of the different embodiments of the method according to the invention. Any combination of the different method step and optional method step can be used according to the kind of conduit and material to be cleaned, that is to say cleared and disinfected.

[0013] Basically, a fluid-flow conduit to be cleaned comprises some fluid or material from a previous plant process step, which sticks or remains into the conduit interior. This fluid or material may be colonized by microorganisms or biofilms using the material as nutriment and/or shelter.

[0014] The different steps of the method according to Fig.1 are detailed below. First step

[0015] A first optional step of the present method is a pretreatment step comprising an air purge/air blow or a liquid purge comprising the circulation of hot water and/or solvent and/or an oxidizer inside the fluid flow conduit. This pretreatment step is useful in order to prepare the inside of the fluid flow conduit for the later mechanical cleaning step and enhance the removal of the material comprising particles, agglomerate masses or biofilms stuck to the inner wall of the fluid flow conduit.

[0016] For example, an air-blow can dry the inside of the fluid-flow conduit, thus limiting the amount of material to be cleaned and rendering biofilms dryer and more sensitive to further cleaning steps.

[0017] Alternatively or in combination, the liquid of the liquid purge may be selected according to the type of material that remains in the fluid-flow conduit to be cleaned. [0018] For example, in the case of biofilms, ozonized water may remove the exterior protective layer of these biofilms and/or some of the connections between the biofilms and the interior of the conduit. Various solvent such as organic solvent or hot water may be used to dissolve the most sensitive part of the material to be cleaned, thus providing an optimal access to the most difficult part of the remaining in the conduit. Ozonized water may also be used in certain conduit where chemicals are not desirable, since ozone is not persistent and does not produce side products.

Second Step [0019] The second process step according to the present method comprises a clearing step in which a clearing body is made to span or travel through or along the inside of the conduit to be cleaned. This clearing body comprises a flowable agglomerate mass comprising a mixture of hard solid frozen particles and a non-gelled wetting liquid. The non-gelled wetting liquid comprises a melt derived from the frozen particles and makes the particles to cohere.

[0020] For example, the solid frozen particle is ice or snow and the non-gelled wetting liquid is water, such a water/ice body being easy and inexpensive to produce as well as environmentally friendly and compatible with a wide range of industry.

[0021] The clearing body is pushed by a liquid or gas pressure, typically water when the body is made of water and ice, although compressed air may also be used. Alternatively, the clearing body may be pushed by the fluid or material which is usually carried out by the conduit under cleaning.

[0022] A method according to this clearing step of the present method is detailed in document EP1248689 which is incorporated herein by reference.

[0023] This clearing step is based on harnessing the complex properties and unparallelled benefits of thick ice. A clearing body of ice slurry or semi-solid ice has the valuable effect to be easily transferred or transported by pumping, similarly to a liquid, while benefiting of some properties of a solid when the body of melting ice is formed within a pipe. The ice is pumped into the pipe and forced by pressure to remove the material remaining in the fluid-flow conduit such as sediments and built-up deposits to leave the conduit clear and obstruction free. As a relatively quick process, it leaves the conduit interior walls undamaged.

[0024] As a result, this clearing step produces a "mechanical cleaning effect" on the inside of the fluid flow conduit.

[0025] In addition, an additive may be added to the clearing body, such as an oxidant, an halogen, a corrosive agent or a surfactant, in order to enhance the clearing effect of the clearing step. In other words, the additive adds a chemical cleaning effect to the mechanical cleaning effect, which may be valuable for certain type of fluid-flow conduit. Carious list of possible additives are provided with reference to the third step detailed below.

[0026] For example, a chlorinated clearing body may be produced from chlorinated water and thus comprises a mixture of chlorinated ice or snow and chlorinated water. Such a chlorinated clearing body is valuable to avoid introducing any microorganisms such as bacteria, fungi or viruses during the clearing step of fluid-flow conduits sensitive to microorganisms, for example drinking water conduit or industrial conduits in the cosmetics or food and beverage industry. [0027] In addition or in combination, an ozonised clearing body may be produced from ozonised water and thus comprise a mixture of ozonized ice and ozonized water. For example, between 50 % and 100 % of the clearing body may be obtained from ozonized water. Alternatively, ozone gas may be injected into the clearing body after its formation from non-ozonized water. [0028] In addition or in combination, an additive may be added to the body in order to decrease the freezing of the liquid used, for example to decrease the freeze point of water below 0°C when a mixture of ice and water is used. Salt such as sodium chloride may be added, as well as sugar. Such an additive enhances the clearing behaviour of the clearing body by allowing a more fluid clearing body with solid particles, appearing as a slurry of melting snow.

[0029] The clearing body may be moved or pushed by a pressure liquid or a gas. Typically, the liquid from which the clearing body has been obtained may be used, for example water when the clearing body is made from melting ice. If an additive is present in the body, this additive may also be present in the pressure liquid, for example chlorinated water to push a chlorinated clearing body or ozonized water to push an ozonized clearing body.

[0030] Alternatively or in combination, namely after a volume of liquid as previously disclosed, the clearing body may also be pushed by a gas, having for example a pressure from 1 to 4 bars according to the mass and volume of the clearing body, the amount of material to be removed and the pressure drop of the conduit to be cleaned. The gas may be compressed air or a chemically active gas, such as steam, ozone or chlorine, for example according to an additive of the clearing body. For example, gaseous ozone may be obtained from an ozone generator TOG C2B from Ozonia Triogen (Glasgow, UK). [0031] For example, several clearing bodies may be injected in the conduit to be cleared and compressed air may be injected alternatively to the injection of each clearing body. As a result, several clearing bodies may pass along the fluid flow conduit, each clearing body being moved and separated from the next body by a "block" of compressed air. This method provides an efficient biofilm cleaning and may allow disinfection when the clearing body comprises an additive such as ozone or chlorine. In addition, the compressed air may be replaced by compressed ozone or steam, which enhances again the cleaning of biofilms.

Third Step

[0032] A third step of disinfection (or sanitation or sterilization) is performed, according to the present method, after the second step of clearing. This disinfection step can comprise a flush with a disinfection media such as a solution comprising a disinfection agent, such as, but not limited to: an oxidizer, a corrosive agent a solvent, steam, silver, tin, halogen. The disinfection media may also be a solvent in a pure form, steam or hot water and their stable combinations.

[0033] In the sense of the present method, disinfection relates to reducing the population of microorganisms by a factor of 10⁵. However, the present method may also be adapted as explained below to microorganism population control where reduction factors of 10² or 10³ may be adapted.

[0034] The oxidizer may be chosen from ozone, hydrogen peroxide, chloramine, sulphuric acid, peroxydisulfuric acid, peroxymonosuifuric acid, chlorite, chlorate, perchlorate, hypochlorite, permanganate, sodium perforate, nitrous oxide, potassium nitrate, sodium bismuthate, hexavalent chromium and their combination.

[0035] A corrosive agent may be chosen from a base such as sodium hydroxide or an acid such as sulfuric acid, acetic acid, hydrochloride acid, nitric acid and their combination.

[0036] The halogen is a solution or aqueous solution of iodine, bromine, chlorine, chloramine or fluorine or their combination.

[0037] Ozone is particularly valuable, as inexpensive to manufacture and not remaining or persisting in the conduit. In addition, it can be produced in situ and does not require handling hazardous material. As a result, a rinsing step is not mandatory and no quality or health problem may occur. In addition, ozone does not produce hazardous by-product when it reacts and destroys microorganisms. For example, ozone can be used as ozonized water, ozonized ice, as a pure gas or as ozonized compressed air.

[0038] When ozonized water is used, the disinfection efficiency depends on the ct value. The ct value expresses the exposition of the microorganisms to ozone and is the mathematical product of the time the microorganisms are exposed to dissolved ozone (t) and the dissolved ozone concentration (c). For example, if an aqueous solution of ozone has a concentration of 2 mg/l is kept in a tube for 5 minutes, then the ct value is 10 mg.min/l.

[0039] The table below 1 sums-up the ct value requires for disinfection according to the type of bacteria present in the conduit to be cleaned, in order to achieve a significant destruction or inactivation of the bacteria population. Water log

Compound temp inactivation ct value

°c mg^*min/L

Cryptosporidium

oocysts 20 2 2.5 - 18

Giardia lamblia cysts 3 0.5 - 1.9

Virus 20 2 0.25

E.Coli 2 0.02 - 0.06

Enterococcus

faecalis 2 0.01 - 0.025

Legionella

pneumophila 2 0.3 - 1.1

Total Coliform 6 0.19

HPC 3 0.19

Poliovirus 1 5 - 25 2 0.1 - 0.2

Rotavirus 5 - 25 2 0.006 - 0.06

Table 1 : ct value according to bacteria type

[0040] A person practicing the present invention may thus adapt the ozone concentration and treatment time according to the microorganisms present in the conduit to be cleaned.

[0041] Then, a solvent may also be used a disinfection agent, for example in an aqueous solution, in particular when it is an alcohol, for example ethanol, a ketone for example acetone, formamide or sulfoxide. The solvent may also be used as pure liquid, in particular for akanes, alkenes, aromatic nitroalkane or halogenoalkanes. Alternatively, they may be used as vapour, i.e. in a gas form. [0042] The disinfection step could comprise a recirculation of the disinfection media from an outlet of the fluid flow conduit to the inlet of the fluid flow conduit. This enhances the effect of disinfection and lower the quantity of disinfection agent needed, by increasing the time parameter in the ct value mathematical product. The recirculation could be monitored by measuring the concentration of disinfection agent and temperature of the fluid recirculated.

[0043] The recirculation loop could comprise an UV module wherein the disinfection media is further disinfected and sterilized before entering back into the fluid flow conduit and thus enhancing the disinfection of the fluid flow conduit or even sterilize it. In addition or alternatively, the recirculation loop may comprise a control of the disinfection agent concentration in the disinfection media. For example, the disinfection agent, such as ozone, may be kept in a constant concentration during the whole duration of the disinfection step.

[0044] If the disinfection media comprises ozonized water produced thanks to an ozone generator, an ozone destruction unit could be added to the process line in order to destroy residual ozone. [0045] An intermediary step may be performed between the second step of clearing and the third step of disinfection. For example, this intermediary step may be heating the inside of the fluid flow conduit or a fluid circulating inside the fluid flow conduit in order to increase the temperature of the inside wall of the fluid-flow conduit and thus the efficiency of the disinfection, especially if the disinfection agent is based on ozone. Indeed, the efficiency of ozone as a disinfection agent decreases with the temperature of the environment in which it is circulating. The fluid flow conduit would be preferably heated to a temperature comprised between 5 and 25 °C, preferably between 10 and 20 °C.

[0046] Means for monitoring the heating of the fluid flow conduit could be connected to means for measuring the inner wall of the fluid flow conduit and would allow the circulation of a disinfection agent inside the fluid flow conduit only when the temperature measured would reach a predetermined threshold between 5 and 25 °C, ideally between 10 and 20 °C. Combination of the second step and the third step

[0047] Alternatively to performing the second step of clearing and the third step of disinfection subsequently, clearing and disinfection may be combined in a single step.

[0048] In this case, the clearing body is moved by a disinfection media such as a gas or a liquid containing a disinfection agent. In this case, the speed of the clearing body may be slow, in order to provide a sufficient time for the disinfection to occur. The disinfection agent may also be chosen as efficient enough to perform disinfection during the time when the clearing body is moved. For example, such an efficient disinfection agent may be chosen from steam or high concentration ozonized water. In the case of ozonized water, the required concentration may be calculated according to the ct value disclosed above.

Fourth step [0049] In a fourth optional step, the present process comprises a post-treatment step. This post-treatment may comprise rinsing with water, such as hot-water or sterile water, destroying remaining ozone if ozone has been used for disinfection, and/or an air blow to dry the interior of the fluid-flow conduit.

[0050] For example, hot water may be used with a temperature above 50 °C, preferably above 60 °C in order to thermally shock the fluid and destroy remaining microorganisms. This could provide a further reduction of the microorganism population, i.e. a supplementary inactivation or destruction of these microorganisms.

[0051] In addition, a step of recirculating the hot water from the outlet of the fluid flow conduit to the inlet of the fluid flow conduit may be performed in order to complete sterilization of the inside of the fluid flow conduit, after the disinfection occurred. [0052] If resilient ozone is present in the fluid flow conduit, it would be advantageously destroyed by this rinsing step because of the high temperature of the operation. Alternatively of in combination the rinsing water may comprise 1 % of sodium bisulfide in order to destroy immediately all remaining ozone. [0053] Alternatively or subsequently to this water rinsing, an air blow may be injected in order to dry the cleaned conduit. Dry conduits are valuable to avoid diluting the material that is usually carried out by the conduit or to avoid the introduction of water when an anhydrous material is to be carried out in the cleaned conduit. For example, hot air having a temperature above 60 °C may be used, for example between 60 and 100 °C. [0054] All the process parameters such as the mass of the clearing body, the flow rate, the concentration of disinfection agent and temperature of the fluid used may be calculated or determined according to the specific tubing system to be treated. I.e. according to pressure loss and the specific geometry or features of the fluid-flow conduit to be cleaned up.

PREFERRED EM BODIM ENT

[0055] In a first embodiment, the method comprises: a first clearing step by a clearing body comprising a mixture of snow and water which is pushed through the fluid flow conduit thanks to pressurized water; followed by a disinfection step wherein ozonised water is circulated from an inlet of the fluid flow conduit to an outlet of the fluid flow conduit for a predetermined amount of time such as 1 minute and 60 minutes, 2 minutes to 30 minutes, or 2 minutes to 10 minutes, according to the kind of microorganisms to be destroyed.

[0056] A second embodiment is similar to the first embodiment but the clearing body is pushed by ozonized water and the ozonized water flow is maintained from a certain amount of time, in order to perform the disinfection step at the same time as the mechanical scrubbing step.

[0057] A third embodiment is similar to the second embodiment by the clearing body is made of ozonized snow and ozonized water.

[0058] A fourth embodiment is similar to the first embodiment but the clearing body of water ice/snow is pushed by a certain amount of water representing for example a tubing length of 10 cm to a tubing length of 10 m, and this certain amount of water is pushed by steam, in order to perform the disinfection step at the same time as the mechanical scrubbing step.

[0059] In a fifth embodiment, several bodies of snow and water are pushed through the conduit to be cleaned by compressed air, and a succession of snow blocks alternated with "air block" thus pass along the conduit.

[0060] The fifth embodiment is similar to the fourth embodiment but the snow and the compressed air are ozonized.

TECHNICAL EFFECT

[0061] The method according to the present invention, in particular claims 1 and 2 enclosed, allows a synergetic effect between the clearing step and the disinfection step which provides an enhanced destruction of biofilms. In other words, the biofilms are significantly more destroyed and significantly less bacteria, fungus, cells or algae remain. In addition the present method is cost-effective and easy to carry out.

INDUSTRIAL APPLICATION

[0062] The invention particularly relates to the application of this method and the use of this apparatus in the flow conduits of processing machinery for beauty/hair care products and beauty components, such as, but not limited to, mascaras, shampoos, conditioners, soap. Basically, any kind of beauty products are supposed to be contained in a container/recipient. But the invention also has applications in other fields such as process machinery for food products and food components, water networks, sewer, oil&gas, nuclear industry, food&beverage industry, pharmaceutical industry, chemical industry, paint&coating industry, any industry wherein disinfection of pipes would be needed.

Claims

1. A method for cleaning a fluid flow conduit comprising: · a clearing step causing a clearing body which spans the conduit interior to pass along inside the conduit, wherein the clearing body is a flowable agglomerate mass comprising frozen particles and a non- gelled wetting liquid, which comprises a melt derived from the frozen particles and by means of which the particles cohere, and

· a disinfection step of injecting a disinfection media into said conduit.

2. A method according to the previous claim, wherein the particles and wetting liquid are water-based.

3. A method according to any of the previous claims, wherein the wetting liquid of the body comprises at least one additive.

4. A method according to the previous claim, wherein said additive is a disinfection agent.

5. A method according to any of the previous claim, wherein said disinfection media is chosen from the list comprising: a solution comprising a disinfection agent, a solvent, steam, hot water and their stable combinations.

6. A method according to the previous claim, wherein the disinfection agent is chosen from an oxidizer, a corrosive agent, a solvent, silver, tin, an halogen or their stable combinations.

7. A method according to the previous claims, wherein the oxidizer is chosen from ozone, hydrogen peroxide, chloramine, sulphuric acid, acetic acid, peroxydisulfuric acid, peroxymonosulfuric acid, chlorite, chlorate, perchlorate, hypochlorite, permanganate, sodium perforate, nitrous oxide, potassium nitrate, sodium bismuthate, hexavalent chromium and their stable combination.

8. A method according to claim 6 or 7, wherein the halogen is chosen from the group comprising chlorine, chloramine, iodine, fluorine, bromine and their combination.

9. A method according to any of the previous claims 5 to 8, wherein the solvent is chosen from the list comprising alcohol, ketone, alkane, alkene, aromatic, halogenoalkane, formamide, sulfoxide, nitro alkanes and their combination.

10. A method according to any of the previous claims 5 to 9, wherein hot water is water above 60 °, preferably 70 °, again preferably above 80 ° and most preferably above 90 °C.

11. A method according to any one of the previous claims, wherein the clearing body is caused to pass along inside the conduit by the injection of the disinfection media.

12. A method according to any of claims 1 to 10, wherein the disinfection media is injected in the conduit after the body has passed along the interior of the conduit.

13. A method according to the previous claim, comprising an intermediary step of :

- heating the inside of the fluid flow conduit or

- circulating a fluid inside the fluid flow conduit before injecting the disinfection media.

14. A method according to any of the previous claims, wherein the disinfection step comprises recirculating the disinfection media in a recirculation loop, said recirculation loop connecting preferably an outlet of the fluid flow conduit to an inlet of the fluid flow conduit.

15. A method according to the previous claim wherein the recirculation loop comprises an UV module.

16. A method according to the previous claim, wherein the disinfection media is a solution comprising a disinfection agent and wherein the concentration of the disinfection agent is maintained constant at a predetermined level during recirculating by means for measuring and controlling said concentration in the recirculation loop.

17. A method according to any of the previous claims, wherein a time break is made before between the clearing step and the disinfection step.

18. A method according to any of the previous claims, further comprising a previous step of pretreatment comprising an air purge/air blow or a liquid purge by using a pre-treatment agent comprising the circulation of hot water and/or pre-treatment agent the fluid flow conduit.

19. A method according to the previous claim, wherein the pretreatment agent comprises an oxidizer is chosen from ozone, hydrogen peroxide, chloride, chloramine, sulphuric acid, acetic acid, peroxydisulfuric acid, peroxymonosulfuric acid, chlorite, chlorate, perchlorate, hypochlorite, permanganate, sodium perforate, nitrous oxide, potassium nitrate, sodium bismuthate, hexavalent chromium and their stable combination.

20. A method according to claim 17 or 18, wherein the pretreatment agent comprises a surfactant is chosen from linear alkylbenzenesulfonate, lignin sulfonate, fatty alcohol ethoxylate, a Iky I phenol ethoxylates and their combination.

21. A method according to any of claims 17 to 19, wherein the pretreatment agent comprises a solvent chosen from the list comprising alcohol, ketones, alkanes, alkenes, aromatic, halogenoalkane, formamide, sulfoxide, nitro alkanes, water and their combination.

22. A method according to any of the previous claims, wherein several clearing bodies are caused to pass along inside the conduit subsequently.

23. A method of clearing the interior of a fluid flow conduit, by causing a clearing body which spans the conduit interior to pass along inside the conduit, wherein the clearing body is a flowable agglomerate mass comprising frozen particles and a non-gelled wetting liquid, which comprises a melt derived from the frozen particles and by means of which the particles cohere,

wherein at least the non-gelled wetting liquid comprises a disinfection agent .

24. A method according to the previous claim, wherein said disinfection agent is chosen from the list comprising: an oxidizer, a solvent, steam, silver, tin, a halogen, and their stable combinations.

25. A method according to any of claims 23 and 24, wherein the oxidizer is chosen from ozone, hydrogen peroxide, chloramine, sulphuric acid, acetic acid, peroxydisulfuric acid, peroxymonosulfuric acid, chlorite, chlorate, perchlorate, hypochlorite, permanganate, sodium perforate, nitrous oxide, potassium nitrate, sodium bismuthate, hexavalent chromium and their stable combination.

26. A method according to any of claims 22 to 25, wherein the solvent is chosen from the list comprising alcohol, ketones, alkanes, alkenes, aromatic, halogenoalkane, formamide, sulfoxide, nitro alkanes, water and their combination.

27. A method according to any of the claims 23 to 26, wherein several clearing bodies are caused to pass along inside the conduit subsequently.

28. An apparatus adapted to carry out the method according to any of the claims 1 -22, said apparatus comprising:

• a first part configured to generate the clearing body from a liquid,

• a second part configured to inject said clearing body into the fluid-flow conduit

· a third part to inject a disinfection media into the fluid-flow conduit.