FR2909659A1 - Processing water before spraying it with phytosanitary treatment product for agriculture and arboriculture, market gardening or viticulture to destroy bad weed, comprises mixing product and processed water from bore, well or spring - Google Patents

Abstract

The method of processing water before spraying it with phytosanitary treatment product for agriculture and arboriculture, market gardening, viticulture or cereal growing to destroy bad weed, comprises mixing the phytosanitary treatment product and the processed water from a bore, a well or a spring, partially or totally removing a cationic and/or metallic minerals, whose presence alter an efficiency of the phytosanitary product, and adjusting a pH of the water before the mixing step. The step of processing the water is carried out using a demineralization bed. The method of processing water before spraying it with phytosanitary treatment product for agriculture and arboriculture, market gardening, viticulture or cereal growing to destroy bad weed, comprises mixing the phytosanitary treatment product and the processed water from a bore, a well or a spring, partially or totally removing a cationic and/or metallic minerals, whose presence alter an efficiency of the phytosanitary product, and adjusting a pH of the water before the mixing step. The step of processing the water is carried out using a demineralization bed formed by associating a cationic ion exchange resin and a zeolite. The cationic ion exchange resin is a type of sodium amberlite. The zeolite is a type of hydrated silicon aluminum sodium calcium. Independent claims are included for: (1) a water treatment device; and (2) a demineralization bed.

Description

The invention relates to a process for the preparation before spreading a

  phytosanitary treatment product. The invention also relates to a device for implementing such a method, as well as a demineralizing bed.

  The invention relates to the fields of the preparation before spreading the phytosanitary treatment products and the treatment of water for the needs of agriculture. Farmers and in particular arborists, market gardeners, winegrowers and grain growers use plant protection products to destroy weeds, eradicate various diseases or destroy insects causing serious damage to their crops. According to phytosanitary product manufacturers' recommendations, these chemical treatment products should not be sprayed pure but diluted in water so that they are spread evenly over the soil, foliage or fruit of the plants. The water used is generally well water, well or spring, or, more rarely, urban water. Depending on their origin, the composition of these waters is variable especially in its content of mineral elements. Approved doses of plant protection products, recommended by manufacturers and distributors, 25 correspond to the maximum authorized doses, which it is forbidden to exceed. At the registered dose, a phytosanitary product is supposed to be effective. However, this does not take into account the actual composition of the farmer's water, which, being mixed with plant protection products, can have an impact on the effectiveness of the said plant protection products. One of the objects of the invention is therefore to propose a solution for improving the efficacy of plant protection products prepared for spreading by mixing them with water.

The waters used in agriculture are also variable in their pH, considered acidic for a pH below 7 and alkaline or basic for a pH greater than 7. The pH of the water used also has an influence at the level, this time , hydrolysis phenomena of the active substances according to certain chemical properties of these active substances, such as their pKa or their solubility in water. It is thus another object of the invention to provide farmers with perfect control of certain parameters of the water used, so as to allow optimum efficacy of the phytosanitary products to be mixed therewith. The invention relates to a process for the preparation before spreading of a phytosanitary treatment product, consisting in mixing a phytosanitary treatment product with water, in particular drilling, well or source, characterized in that prior to mixing, the water is treated to remove, partially or completely, cationic species of mineral and / or metal origin likely to alter the presence of the efficacy of said phytosanitary product. Advantageously, a pH adjustment step of the water is also carried out before mixing. According to an advantageous embodiment, at least one of the Cal +, Mg 2+, Mn 2 +, A 13 +, Zn 2 +, Fe 2 +, Fei + cations is removed either alone or in any combination between them. According to another feature of the invention, the treatment of water is carried out by passing the water on a demineralizing bed formed by the combination of a cationic ion exchange resin and at least one zeolite.

The invention also relates to a water treatment device for implementing the method, in the form of a treatment unit comprising a water supply to be treated, said water being derived in particular from a borehole, a well or a source, and an evacuation of the treated water, and demineralization means of the water to be treated, characterized in that the demineralization means are constituted by a demineralizing bed formed by the combination of a cationic ion exchange resin and at least one zeolite. Advantageously, the water treatment device according to the invention further comprises means for adjusting the pH of the water. The invention also relates to a demineralising bed formed by the combination of a cationic ion exchange resin and at least one zeolite. The invention thus makes it possible to use the phytosanitary products at their optimum efficiency, ultimately making it possible to reduce the doses of phytosanitary products used while guaranteeing the maintenance of the same efficacy on the crops as compared with the previous results, which constitutes a double economic and ecological advantage.

Other objects and advantages of the present invention will become apparent from the following description, illustrated for its understanding with the aid of the attached drawing, schematically showing a water treatment device for carrying out the method according to the invention. the invention.

The present invention relates to the field of water treatment for agricultural purposes, particularly for the preparation before spreading of phytosanitary treatment products. During laboratory studies, it appeared an impact of the proven content of mineral elements, in the form of cationic elements, on the degradation of the active substances constituting phytosanitary products. Cationic elements responsible for such degradation have been identified as Cal +, Mg2 +, Mn2 +, A13 +, Zn2 +, Fe2 +, Fe3 + cations. On the basis of this finding, a solution has been devised for improving the efficacy of plant protection products to be mixed with water for their application.

Thus, the invention relates, more particularly, to a process for the preparation before spreading of a phytosanitary treatment product. This method provides for the mixing of a phytosanitary treatment product with water, in particular drilling, well or source, with a preliminary step of treating the water to remove, partially or entirely, the species. cationic agents of mineral and / or metal origin likely to alter by their presence the efficacy of said phytosanitary product. For this, and as visible in the accompanying drawing, a water treatment device is used, in the form of a treatment unit 1 comprising a water supply to be treated, said water being derived in particular from a borehole. , a well or a source, or even the urban network, and water evacuation of treated water, and demineralization means 2 of the water to be treated. These demineralization means 2 consist of a demineralizing bed 2 formed by the combination of a cationic ion exchange resin and at least one zeolite. It is the ion exchange cationic resin which retains the elements Cal + and Mg2 +, the zeolite or zeolites retaining the elements Mn2 +, A13 +, Zn2 +, Fe2 +, Fei -. The hold is partially carried out for the ion exchange cationic resin and completely for the zeolite (s). Advantageously, the cationic ion exchange resin used is of the Amberlite Na + type and the hydrated SiAlNaCa type zeolite. Ideally, the proportions used are of the order of 80% cationic ion exchange resin and 20% zeolite. The method according to the invention further provides a step of adjusting the pH of the water before mixing. Indeed, in order to avoid the phenomenon of hydrolysis of the active substances constituting the phytosanitary products used, it is advisable for the farmer to be able to match the pH of the water used according to the stability ranges of the active substances. . In this way the process according to the invention makes it possible to further improve the effectiveness of the phytosanitary products used. In order to fulfill this objective, the treatment unit 5 still has means 3 for adjusting the pH of the water. In this regard, it has been established that the pH of the water at the outlet of the demineralization means 2, situated between 6.7 and 7.4, is sufficient to prevent hydrolysis of the active substances formed by neutral or alkaline molecules. .

However, the pH of the water must be adjusted to obtain a pH around 4.5 in order to preserve the active substances formed by acidic molecules. Thus, a system of pH adjustment by addition of sulfuric acid H2SO4 was chosen. It will be natural for one skilled in the art to use other acidifying substances for such purpose. In the same manner, the skilled person can easily consider all the means necessary to vary the pH including other values or more basic values.

If the addition of H2SO4 can be envisaged by a manual operation of the farmers, the security recommends the realization of this operation by an automated system. The adjustment means 3 for the pH of the water are thus constituted by a dispensing metering pump 4. This is coupled to a volumetric meter 5 at the outlet of the demineralization means 2. Finally, the metering dispensing pump 4 is designed capable of injecting into the water a measured quantity of H2SO4 for an adjustment of the pH to a determined value, preferably 4.5, the volume of H2SO4 to be injected being data recorded by the volumetric meter 5. In order to avoid the fouling of the resins, the treatment unit further comprises means 6 for retaining solid particles suspended in water. These holding means 6, located upstream of the demineralization means 2, consist of a sand and silt filter.

In particular, a 400 μm to 100 μm disk filter is used to remove coarse sand and silt, and / or a 20 μm cartridge filter to remove fine silt.

The processing unit 1 still has means 7 for controlling the flow of water inside the processing unit 1. These control means 7 are advantageously constituted by an electronic head with a solenoid valve at the inlet demineralization means 2, to ensure the automation of the treatment unit and an instantaneous flow rate of 7 to 24 m3 / hour of the installation. The processing unit 1 is further provided with cleaning means 8 for the cationic resin. This is done through the passage of brine water, rich in Na + and Cl- ions, at the level of the cationic resin, the Na + ions being used to regenerate the cationic resin by competition. Chloride evacuation resulting from the cleaning is provided. The treatment unit 1 still has means 9 for controlling the pressure of the water, in the form of a booster. 20 25

Claims (10)

  1) Process for the preparation before spreading of a phytosanitary treatment product, comprising mixing a phytosanitary treatment product with water, in particular drilling, well or source, characterized in that, prior to mixing , the water is treated to remove, partially or completely, cationic species of mineral and / or metal origin likely to alter the presence of the efficacy of said phytosanitary product.   2) Process according to claim 1, characterized in that one carries out in addition a step of adjusting the pH of the water before mixing.   3) Process according to one of claims 1 or 2, characterized in that at least one of Cal +, Me, Mn2 +, A13 +, Zn2 +, Fe2 +, Fei + is taken alone or in any combination. between them.   4) Method according to one of claims 1 to 3, characterized in that the treatment is carried out by passing the water on a demineralizing bed (2) formed by the combination of an ion exchange resin cationic material and at least one zeolite.   5) Method according to one of claims 1 to 4, characterized in that the cationic ion exchange resin is Amberlite Na + type.   6) Method according to one of claims 1 to 5, characterized in that the zeolite is hydrated SiAlNaCa type.   7) water treatment device for carrying out the method according to one of claims 1 to 6, in the form of a treatment unit (1) comprising a water supply 30 to be treated, said water being issued in particular a well, a well or a source, and an evacuation of the treated water, and demineralization means (2) of the water to be treated, characterized in that the demineralization means are constituted by a demineralising bed formed by the combination of a cationic ion exchange resin and at least one zeolite. 5   8) water treatment device according to claim 7, characterized in that it further comprises means (3) for adjusting the pH of the water.   9) A water treatment device according to claim 8, characterized in that the means (3) for adjusting the pH of the water to be treated consist of a metering pump (4) coupled to a volumetric meter ( 5), and designed to inject a measured amount of H2SO4 into water to adjust the pH to a determined value.   10) demineralizing bed characterized in that it is formed by the combination of a cationic ion exchange resin and at least one zeolite.