PROCESS FOR HYGIENIZING ARTHROPOD LARVAE, AND IN PARTICULAR INSECTS AND MORE SPECIFICALLY CRUSHED DIPTERANS

Abstract

The present invention relates to a method for sanitizing arthropod larvae, and in particular insects and more specifically crushed Diptera, characterized in that a heat treatment is carried out on a continuous flow of a mixture of crushed larvae with glue water and / or hot water to reach a temperature of between 100°C and 120°C and then maintained at this temperature for a period of between 45 seconds and 6 minutes. Abstract figure: figure 1

Description

Title of the invention: METHOD FOR HYGIENIZING ARTHROPOD LARVAE, AND IN PARTICULAR INSECTS AND MORE SPECIFICALLY OF CRUSHED DIPTERANS Field of invention

[0001] The present invention relates to the field of industrial breeding of arthropods, in particular insects and more particularly Diptera, for the purposes of food production.

[0002] The invention relates more particularly to the field of insect breeding, in particular to the black soldier fly.

[0003] Insects have a number of characteristics that make them well suited for use in animal feed. Insects contribute a high protein content, while being rich in other beneficial nutrients such as fats, minerals and vitamins. Protein concentration levels in insect meals intended for animal feed vary between 55% and 75%. Insects are characterized by a higher feed conversion rate and can therefore become a very valuable feed source for farm animals. Insects are a natural component of the diets of animals such as carnivorous fish and poultry (for example, insects can provide up to 70% of the dietary requirements of trout).

[0004] Furthermore, these products also have a well-balanced nutritional profile to meet human dietary needs.

[0005] These considerations have led to the development of automated mass production of food from the breeding of arthropods, and more particularly insects, in industrial sites organized into complementary spaces specialized in laying, hatching, breeding, collection of mature animals and their treatment to extract the compounds of interest.

[0006] These industrial sites must be optimized to allow the industrialization of large volumes of larvae. One of the critical steps concerns the processing of live larvae in order to recover them, in particular the larvae of the black soldier fly Hermetia Illucens. The larvae are recovered in the form of protein meal and quality oil. The breeding environment in which the larvae evolve at the end of their growth cycle, called frass, is also recovered. Frass is made up of a mixture of larval droppings and residues of uneaten, dried and fermented substrate.

[0007] This processing step occurs after steps of egg production under industrial conditions, collection of eggs laid by female insects and concentration of larvae for breeding purposes because they should be grouped as homogeneously as possible, in batches of neonate larvae all having the same stage of maturity in a given batch. Generally, spawning takes place in a cage confining the flies in a closed space in which collectors are arranged with laying surfaces, for example grooved plates, on which the females deposit the eggs. These collectors are collected to then allow the eggs to hatch, giving rise to neonate larvae which are then injected onto a nutrient medium in breeding modules. These neonate larvae are then raised in multi-stage growth modules to reach maturity before being transformed into nutrients and food, which is the stage which is the subject of this patent.

[0008] The present invention relates to a method and a system intended to sanitize larvae previously ground at a temperature above 100°C, the ground larvae then being able to be subjected to additional treatment to extract the components of interest, in particular proteins and oily substances. State of the art

[0009] Various solutions are known in the state of the art for sanitizing pasta obtained from larvae.

[0010] French patent FR3070001A1 describes an entomoculture process implementing a step consisting of feeding insect larvae with organic waste and a step of slaughtering the insect larvae with a view to transforming them into a recoverable product, characterized in that the slaughter step is carried out by subjecting the larvae to a progressive increase in pressure up to a hygienization step during which the pressure is between 300 MPa and 700 MPa.

[0011] European patent EP2953487 describes another process for converting fresh insects or worms into nutrient streams, comprising the steps of first reducing the size of the insects or worms to obtain an insect or worm pulp, then heating the pulp to a temperature of 70-100°C, and then subjecting the heated pulp to a physical separation step, thereby obtaining a fat fraction, an aqueous protein fraction and a solid-containing fraction, provided that the process does not include an enzymatic treatment of the pulp, in which the aqueous protein fraction and the solid-containing fraction are dried.

[0012] Patent application WO2021014079A1 describes a process for obtaining protein-enriched flours from larvae used for the bioconversion of organic waste, comprising the following steps: • a step of supplying previously cleaned larvae constituting an initial nutrient mixture of fresh larvae; • a mechanical step of reducing the size of the larvae, leading to the formation of a nutrient mixture in the form of pulp (or larval pulp); • a step of physical separation of said nutrient mixture in the form of larval pulp, leading to the production of a lipid phase (also called “free oil”), a liquid phase rich in proteins and containing mainly water, and a solid phase rich in proteins; • a solid phase drying step; • a step of cooling the dried product thus obtained, followed by a fine grinding to obtain flour; • a heating step carried out before the mechanical reduction step and at a temperature between 60°C and 90°C.

[0013] Patent application WO2021167449 describes a method for producing eviscerated insects, such as black soldier fly larvae and mealworms, preferably live insects for insect separation or processed eviscerated insects into at least one fat fraction and / or at least one protein fraction.

[0014] This solution aims to stimulate the evisceration of the insect and the release of the insect's intestinal contents into the liquid with the aim of providing a liquid comprising the insect's intestinal contents on the one hand, and the living insect on the other hand. Disadvantages of the prior art

[0015] The solutions of the prior art require significant water consumption, and energy expenditure to then eliminate the excess water.

[0016] The solutions of the prior art operate mainly in “batch” mode, in sequential batches because they require too long a time to reach an acceptable level of sanitation to allow continuous operation to be considered.

[0017] The fact of using, in the prior art, a grinder ensuring both the slaughter of the larvae and their transformation is moreover not optimal and requires compromises which lead to a lower recovery of the substances of interest resulting from the transformation of the larvae. Solution provided by the invention

[0018] The invention relates, in its most general sense, to a method for sanitizing arthropod larvae, and in particular insects and more specifically crushed Diptera, characterized in that a heat treatment is carried out on a continuous flow of a mixture of crushed larvae with glue water and / or hot water to reach a temperature of between 100°C and 120°C and then maintained at this temperature for a period of between 45 seconds and 6 minutes.

[0019] According to particular implementation methods: • said heat treatment is carried out by circulating said continuous flow through a heat exchanger bringing the mixture to a temperature between 100°C and 120°C then through a temperature maintenance chamber (9); • said heat treatment is repeated on the mixture having passed through said chamber in the event of non-compliance of the previous heat treatment; • said larvae undergo pre-treatment before grinding including soaking in a hot water tank and cleaning for separation of the frass; • the process also includes a subsequent step of cooling and storage in a thermostatically controlled tank; • said mixing step with glue water and / or hot water is controlled to allow variable dosing of the glue water supply on the one hand and of the hot water on the other hand; • the larvae are devitalized before crushing at a temperature between 55° and 95°C; • the pressure during the heat treatment phase is maintained between 0.5 and 9 barg to avoid vaporization in the pipes.

[0020] The invention also relates to an installation for the sanitization of crushed dipteran larvae characterized in that it comprises a heat treatment exchanger in which the mixture of crushed larvae with glue water and / or hot water circulates in the internal tube constituting the primary circuit and in which superheated water circulates in the concentric space between the external tube and the internal tube and forming the secondary circuit.

[0021] According to variants, the installation which is the subject of the invention also has the following characteristics: • said primary circuit of the exchanger comprises pressure sensors at the inlet and outlet of the exchanger to detect fouling of the exchanger; • it includes, downstream of the cooler, a three-way valve to direct the flow of the mixture either towards the tank or towards the launch tank; • the installation also includes a chamber for maintaining the temperature of the mixture of crushed larvae with glue water and / or hot water from said heat exchanger; • said chamber consists of at least two sections, at least one part of which is bypassable, said chamber consisting of heat-insulated tubes, in which circulates the mixture of ground larvae with glue water and / or hot water once it has reached its target temperature at the outlet of the heat exchanger; • the installation includes a cooling means downstream of said chamber; • said cooling means comprises a concentric tube exchanger with cold water circulating around the mixture of crushed larvae with glue water and / or water, without contact. Detailed description of a non-limiting example of embodiment

[0022] Other characteristics and advantages will emerge from the following description of the invention, a description given by way of example only, referring to the appended drawings in which:

[0023] [Fig-1] [Fig.l] represents the diagram of the treatments which are the subject of the invention. General principle of the invention

[0024] After the devitalization of the live larvae, an essential step is applied to the ground larvae: hygienization, the main object of the present invention. Hygienization is a crucial step for controlling the bacteriological quality of the products. It is mainly in this step that bacteria are killed, and in particular Clostridium Perfringens, Enterobacteriaceae and Salmonella from which the final products (protein flours and oil) must be free. The destruction of these bacteria is ensured by a heat treatment, that is to say by maintaining the mixture of ground larvae and water at a certain temperature for a certain time. The choice of this time / temperature pair is absolutely essential to validate the sanitary quality of the product. This pair varies in particular depending on the nature of the bacteria to be eliminated and the matrix in which these bacteria evolve.

[0025] Hygienization is carried out in two stages via two main pieces of equipment: • the function of the hygienization exchanger is to raise the product to the target temperature for heat treatment; • the function of the chamber is to keep the product at the correct temperature for the desired duration. Pretreatment of live mature larvae

[0026] Prior to sanitization, the mature larvae are subjected to a pretreatment consisting of devitalizing them by a heat treatment in an aqueous medium, grinding the devitalized larvae and mixing them with water, then sanitizing this mixture of ground larvae and water to prepare a nutritive composition which can be subjected to additional treatments for separating the oils and proteins, for example.

[0027] Before the devitalization stage, the larvae are separated from the frass (consisting of a mixture of the larvae's droppings and the residues of the uneaten, dried substrate and fermented) via two stages of particle size separation. The first stage is carried out using a trampoline sieve which separates the live larvae from the powdered frass. The second stage is carried out using a circular screen which separates the live larvae from any pellets or agglomerated frass plates.

[0028] The live larvae fall by gravity into a parallelepiped mixing tank. The larvae are mixed with water in a controlled proportion. Water is used for several reasons. • Firstly, water serves as a transport vector to make it easier to handle and transfer the larvae by pumping. • Water also serves as a thermal vector to thermally devitalize the larvae. • Water is also used to finish cleaning the larvae and constitutes a third purification step. Indeed, the larvae are relatively moist on the surface and "grains" of frass can end up stuck to their surfaces. In this case, the sieving step using the trampoline sieve is not effective because this stuck frass remains attached to the larvae. In water, the frass can detach and pass into the aqueous phase.

[0029] The live larvae and the residual frass are immersed in a mixing tank containing hot water. The contents of this tank, the mixture of larvae, water and residual frass, are transferred into an exchanger (1) using a membrane pump to bring the mixture to a temperature between 55°C and 95°C (preferably between 55°C and 60°C) in order to devitalize the larvae. The mixture of devitalized larvae, water and residual frass is then poured onto a draining screen (2) separating the devitalized larvae and the charged effluents (water and residual frass). The devitalized larvae are transferred to a grinder (3). The loaded effluents are discharged to the dirty compartment of a separation tank (4) separating the frass which is transferred to a frass press (5) then to frass recovery equipment.The purified water obtained at the outlet of the frass press is then injected into the clean compartment of the separation tank, so that the residual frass remains concentrated in the dirty compartment. Clean water is also drawn from the clean compartment of the separation tank to be reinjected in whole or in part into the mixing tank.

[0030] The devitalized and cleaned larvae from the draining screen (2) are transferred into two grinders in series (3) using an eccentric rotor pump. Transfer of devitalized larvae paste

[0031] The larvae are received in a launch tank (6), fed by the two grinders in series (3). The volume of this tank (6) is preferably reduced so as not to store the larvae for a long time and to avoid bacterial proliferation or sporulation. (approximately 4m3). The launch tank is agitated to improve and homogenize the mixture. An eccentric rotor pump (7) transfers the crushed larvae through a heat exchanger (8) then a chamber (9) then a cooler to a buffer tank (11). The launch tank is agitated to improve and homogenize the mixture. Dilution of larvae

[0032] Water is introduced to dilute the larvae; this water is introduced at two locations: upstream of the pump that pushes the larvae through the grinders (3) and directly into the launch tank (6). The larvae flow rate is measured at the inlet of the processing zone, upstream of the addition of water, by an electromagnetic flow meter (13). The water flow rate is also measured by an electromagnetic flow meter (16). A dilution ratio is maintained.

[0033] Depending on the actual flow rate of crushed larvae, the water flow rate is adjusted to maintain the target dilution ratio (between 20 and 50%). The dilution ratio is chosen in relation to the quality of the phase separation in the three-phase separator also called a three-phase decanter (12) and the pressure losses in the pipes and equipment. The ratio can be configured by the operator.

[0034] The water added to the larvae comes from two different sources. • On the one hand, the water used is glue water recovered from the outlet of the three-phase decanter (12). The temperature of the glue water is above 70°C. The glue water that is added comes directly from the three-phase decanter and is therefore part of the same production batch. • On the other hand, the water used comes from an ECP network (Process Hot Water, a network distributing hot water throughout the industrial site from softened water heating). The temperature of the ECP is 55°C.

[0035] Two pilot-controlled valves (17, 18) control the respective flow rate of these two sources to optimize energy consumption. When the line is started, it is the water from the ECP network that is added to the larvae upstream of the second grinder (3). The switch from the ECP network to the glue water produced by the three-phase decanter (12) takes place at the end of the line start-up.

[0036] The use of the glue water produced by the three-phase decanter (12) allows: • energy optimization by mixing hot water at around 70°C with the crushed larvae; • optimization of water consumption. By using ECP, water is added to the system whereas by using glue water, there is no additional water introduced into the system which allows reduce the amount of glue water produced. This also represents a significant energy optimization since the glue water is evaporated and then dried. Heat treatment

[0037] Once the mixture of water and crushed larvae has been made, this mixture reaches the heat treatment exchanger (8). This is a double-tube tubular exchanger. The mixture of crushed larvae and water circulates in the inner tube constituting the primary circuit and the hot water circulates in the concentric space between the outer tube and the inner tube and forming the secondary circuit. The two fluids circulate in counter-current. There is no contact between the mixture of water and crushed larvae and the hot water. The exchanger is for example composed of 34 tubes 6 m long, i.e. a travel distance of 204 m. By circulating in the exchanger (8), the temperature of the mixture of crushed larvae and circulating water increases to reach the nominal temperature of between 100°C and 120°C, preferably between 100°C and 110°C, preferably 106°C, at the outlet of the exchanger (8).

[0038] Treatment at high temperatures results from the observation of the sensitivity of certain heat-resistant bacteria present in larvae such as Clostridium perfringens. The effect of increasing the temperature is much more effective than increasing the time on the destruction of heat-resistant bacteria.

[0039] The table below specifies the time required for the destruction of one log and 3 log of clostridium perfringens spores as a function of temperature: Temperature °C 90 102 104 106 Time to destroy 1 log 80 h 3.5 min 1 min 0.3 min Time to destroy 3 log N / A 6.7 min 2 min 0.6 min

[0040] The hot water circulating in the secondary circuit of the exchanger (8) is water superheated to a temperature between 108 and 120°C (preferably 110°C) in a steam / water exchanger (15). The superheated water is softened water. The steam used for this heating is steam from the steam network. The steam and the superheated water are not in contact. The flow rate of hot water circulating in the hygienization heat exchanger (8) is automatically controlled by the temperature of the product at the outlet of the temperature rise exchanger. A PID (proportional, integral, derivative) controller makes it possible to automatically regulate the opening of a modulating valve located on the hot water outlet of the exchanger, so as to maintain the outlet temperature of the product at the setpoint. The PID controller continuously adjusts the opening of this valve so as to keep the temperature exactly at the temperature setpoint.

[0041] If the temperature tends to decrease, the PID controller immediately acts on the opening of the superheated water valve to open it further. Conversely, if the temperature increases, the PID controller immediately acts on the opening of the superheated water valve to close it further. Temperature sensors are positioned along the exchanger to monitor the temperature change. Sample intakes are located on the elbows of the primary circuit of the exchanger (8) and allow the crushed larvae and water mixture to be analyzed if necessary. The pressure at the inlet and outlet of the exchanger (8) is monitored via the continuous pressure sensors. This allows the exchanger to be monitored for fouling. The normal pressure drop in the exchanger is 3 bars. If the pressure drop increases, this means that there is fouling in the exchanger (8).

[0042] Static mixers are also integrated inside and along the exchanger to have a completely homogeneous mixture in composition and temperature. These static mixers are composed of a tube lined with helical links mounted alternately with a 90° left and then 90° right rotation. The phenomenon of division and rotation of the mixture makes it possible to obtain a homogeneous mixture. These mixers avoid having a temperature gradient in the mixture which circulates along the exchanger because of the pasty nature of this mixture creating a non-turbulent flow. Chambering

[0043] Generally, the chamber is constructed to have several sections which can be placed in series or used alone, or in any suitable combination depending on the number of configurations provided. These sections of the chamber are made up of tubes creating a more or less long path depending on the number of tubes crossed by the mixture of crushed larvae and water.

[0044] The advantage of having several configurations is that it allows a wide range of flow rates of crushed larvae mixture to be processed. This specificity is particularly interesting during the production ramp-up phases when the installation is put into service.

[0045] The configurations cannot be modified during production; this is a choice to be made before production. The configuration selection is made via a bridging table.

[0046] Depending on the flow rate of the mixture of crushed larvae and water to be treated, it is possible to select one or more sections of chambers placed in series, to adapt the time of passage of the mixture in the chamber to the planned flow rate. This makes it possible to operate at different flow rates depending on the capacity of the line and in particular depending on the evolving capacity of the breeding area, while ensuring a fixed temperature maintenance time. It is in fact difficult to change the temperature maintenance time because it is a parameter which is fixed in the health approval file.

[0047] According to one embodiment, the chamber (9) is made up of two sections, the first of which is bypassable. The chamber (9) is made up of heat-insulated tubes, in which the mixture of crushed larvae and water circulates once it has reached its target temperature at the outlet of the heat exchanger. It makes it possible to maintain the mixture at a quasi-constant temperature (maximum loss of approximately 2°C between the inlet and the outlet of the chamber). The length of the chamber (9) and the speed of the mixture (resulting from the section of the piping and the flow rate of the mixture of crushed larvae and water) in the tubes define the duration of temperature maintenance. A flow meter located at the discharge of the eccentric rotor pump which pushes towards the exchanger and the chamber makes it possible to measure the flow rate in the exchanger and the chamber.

[0048] If the flow rate of the crushed larvae and water mixture is lower than a threshold value, then a first configuration will be selected by the bridging table.

[0049] If the flow rate is higher than this threshold value, the second configuration is selected. Cooling

[0050] Downstream of the chambering, the heat treatment is complete. The bacteria are eliminated and the mixture of crushed larvae and water is healthy. The mixture of crushed larvae and water, sanitized and then cooled, is sent to a tank (11), with a capacity of 15 m3 for example. This tank (11) makes it possible to decouple the sanitation processes and subsequent treatments, in particular the separation of the different phases.

[0051] Cooling is for example provided by a 36m exchanger (10) (6 tubes of 6m) similar to the hygienization exchanger, with cold water circulating around the mixture of crushed larvae and water, without contact. The cold water is cooled in a plate exchanger thanks to another cold water loop which is cooled by an air cooler.

[0052] The advantage of the cooler (10) is that the temperature of the mixture of crushed larvae and water leaving the cooler (10) can be controlled in order to optimize the separation of proteins and oil according to the temperature of the mixture of crushed larvae and water at the inlet of the three-phase decanter. The temperature of the mixture of crushed larvae and water leaving the cooler (10) is controlled by preferentially varying the temperature of the cold water at the inlet of the cooler and it is also possible to vary the flow rate of cold water in the cooler (10).

[0053] To vary the water temperature in the cooler (10), a 3-way modulating valve is used to modulate the water flow through the plate exchanger with a bypass of this exchanger. To vary the water flow to the cooler (10), a bypass of the cooler (10) with a 3-way modulating valve is also installed. Recycling of the crushed larvae and water mixture

[0054] It is also possible to recycle the mixture of crushed larvae and water to the launch tank in the event that the desired time-temperature pair has not been respected. Downstream of the cooler (10), a 3-way valve (14) allows the mixture to be automatically directed either to the tank (11) or to the launch tank (6). If the temperatures at the inlet and outlet of the chamber are lower than the target temperature or the time spent in the chamber is lower than the target time, then the valve (14) opens automatically towards the launch tank (6). If the temperatures and the time are greater than or equal to the target values, then the valve (14) opens automatically towards the tank (11). Maintaining back pressure

[0055] Since the temperature of the crushed larvae and water mixture is higher than 100°C (target temperature of 106°C) during the heat treatment, there is a risk of vaporization in the pipes. Thus, the pressure during the heat treatment phase is maintained between 0.5 and 9 barg, preferably between 1 and 3 barg, to avoid vaporization in the pipes. A restriction orifice located in the pipe downstream of the cooler (10) creates a pressure drop calculated to have a pressure of approximately 1 barg just upstream of the orifice. A bypass line with 2 automatic valves located on either side of the orifice allows it to be bypassed during cleaning in order to circulate a large flow in the exchanger and the chamber to clean them effectively.

[0056] Storage of the mixture of crushed larvae and hygienized water

[0057] The tank (11) is filled from the top. The tank (11) is stirred by an agitator of the type anchor to maintain a homogeneous mixture. Antioxidant can be injected into the tank (11) if necessary. This antioxidant is added to prevent oxidation of the crushed larvae and water mixture to prevent it from becoming rancid and thus losing its palatability. The tank (11) is maintained at temperature (between approximately 80 and 95 °C) by a double jacket in which hot water circulates without contact with the crushed larvae and water mixture. Maintaining the temperature prevents the fatty part from solidifying in the tank and maintains a temperature high enough to ensure good separation during subsequent treatment by a three-phase decanter, for example. Continuous operation

[0058] The treatment described in the above is advantageously carried out continuously and not in “batch” mode. Indeed, the characteristic times of hygienization are sufficiently short for it to be carried out continuously with equipment of reasonable size.

Claims

Claims

1. - Method for sanitizing arthropod larvae, and in particular insects and more specifically crushed Diptera, characterized in that a heat treatment is carried out on a continuous flow of a mixture of crushed larvae with glue water and / or water to reach a temperature above 100°C, between 100°C and 120°C and then maintaining it at this temperature for a period of between 45 seconds and 6 minutes, said heat treatment being carried out by circulating said continuous flow through a heat exchanger bringing the mixture to a temperature between 100°C and 120°C and then through a temperature maintenance chamber (9), said heat treatment being repeated on the mixture having passed through said chamber (9) in the event of non-compliance of the previous heat treatment.

2. - Method for sanitizing crushed larvae according to claim 1 or 2, characterized in that it comprises a subsequent step of cooling and storage in a thermostatically controlled tank.

3. - Method for sanitizing crushed larvae according to claim 1, characterized in that it comprises a preliminary pre-treatment step before crushing said crushed larvae, comprising soaking in a tank of hot water and cleaning for the separation of the frass.

4. - Method for sanitizing crushed larvae according to claim 1 characterized in that the pressure during the heat treatment phase is maintained between 0.5 and 9 barg to avoid vaporization in the pipes.

5. - Installation for the sanitization of ground arthropod larvae, in particular insects and more specifically Diptera, intended to carry out a heat treatment of a continuous flow of a mixture comprising ground larvae with glue water and / or water, in a temperature range strictly between 100°C and 120°C for a duration of between 45 seconds and 6 minutes, for the implementation of the method according to claim 1 characterized in that it: - a heat treatment exchanger (8) in which a mixture of arthropod larvae, and in particular insects and more specifically Diptera, ground with glue water and / or water, circulates in an internal tube constituting the primary circuit and in which superheated water circulates in the concentric space between the external tube and the internal tube and forming the secondary circuit - a chamber (9) for maintaining the temperature of the mixture of ground larvae with glue water and / or water from said heat exchanger (8).

6. - Installation for the sanitization of crushed larvae according to claim 5 characterized in that it comprises downstream of a cooler (10), a 3-way valve (14) to direct the flow of the mixture either towards a tank (11) or towards a launch tank (6).

7. - Installation for the sanitization of crushed larvae according to claim 5 characterized in that said primary circuit of the exchanger (8) comprises pressure sensors at the inlet and outlet of the exchanger (8) to detect fouling of the exchanger (8) by measuring the pressure difference between the inlet and the outlet of the exchanger (8).

8. - Installation for the sanitization of crushed larvae according to the preceding claim, characterized in that said chamber (9) is constituted by at least 2 sections, at least one part of which is bypassable, said chamber (9) being constituted by heat-insulated tubes, in which circulates the mixture of crushed larvae with glue water and / or water once it has reached its target temperature at the outlet of the heat exchanger.

9. - Installation for the sanitization of crushed larvae according to claim 10 characterized in that it comprises downstream of said chamber (9) a cooling means.

10. - Installation for the sanitization of crushed larvae according to the preceding claim, characterized in that said cooling means comprises a concentric tube exchanger (10) with cold water circulating around the mixture of crushed larvae with glue water and / or water, without contact.

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