Method for recycling waste from industrial plant producing pigments, dyes, anianides and touchanizers and use of treated sludge, resin or

Abstract

The present disclosure relates to a method for recycling waste from industrial treatment plants producing pigments, dyes, anilines and toners and the use of treated sludge, residue or petrochemical sludge. The present invention relates generally to the technical field of recycling of aqueous chemical waste for providing colours in industrial processes, and more particularly to a process for recycling and reusing liquid, semi-solid or solid waste obtained as waste from its source process or precipitates commonly referred to as wastewater treatment plants, processes for use in similar industrial fields reuse them to provide color, uniform fiber coloration, and improvements in existing processes.

Description

[0001] This application is a divisional application of a Chinese invention patent application with an application date of November 27, 2020, national application number 202080082751.6, and invention name “Method for recycling waste from treatment plants of industries producing pigments, dyes, aniline and color enhancers, and use of treated sludge, residues or petrochemical sludge”.

[0002] Technical field of the invention

[0003] This relates to an invention covering a group of industries that are interrelated so as to constitute a single inventive concept. Recycling and use of chemical wastes that produce colors in aqueous media and produce their wastes at any stage of their life cycle, which are different from other references because they are produced biologically or physically and chemically at water treatment plants, producing residues, inks and paints, dispersions, pigments, dyes or anilines produced by production, beneficiation, processing or conversion plants that exceed their service life, such as: textile factories, screen printing plants, dyeing plants and food factories. More specifically, this relates to a method for recycling and reuse of liquids, pastes, or solid wastes (commonly referred to as wastes, solid wastes, sludges, residues, or petrochemical sludges) obtained from industrial processes or water treatment stations, for restoring them to their preservation state for new formulations or as supplements to paints, dyes, pigments and inks for flexographic printing, substrate surface agents, screen printing, decoration, dispersions and color equalizers in fabrics and knitted fabrics (such as cotton).

[0004] Wastes are obtained by exploring their lifespan, contamination from waste generated during treatment during their manufacture, or use in the production process. The so-called "residues" obtained from excess dyes, incompletely reacted dyes, and washing equipment used in the development laboratories for the production of inks and paints; or even water used for washing printing cylinders, or from laundries, dry cleaners and dye shops, shoe manufacturing, and food, in addition to factories manufacturing or using color-enhancing products that pollute their liquid waste treatment plants. Background Art

[0005] Until recently, about 80% of dyes were returned to the process via water treatment in the above industries, the other 20% was chemical waste (called residues) that was not recycled and was simply stored next to the treatment station or sent to landfill. Some projects are underway to recycle this water for civil construction. However, the usage is only a small percentage compared to the daily production of these wastes.

[0006] These technologies lead to operational problems, such as the need for storage space; commercial problems, such as high inventory and landfill costs; and environmental problems, such as the unpleasant odor of waste that does not decompose. Instead, they turn into spongy sludge after a few years, which seeps out of the landfill after a few years, causing soil contamination and making it unusable.

[0007] This situation changed with the advent of patent BR 10 2017 014575 1, held by the applicant who also filed the present application. This proposes a waste recycling process involving physical and chemical methods, in which up to 30% of the formulation is replaced by a treated residue, which can be the ink or paint itself without additives. After the introduction of additives, the product becomes a colorant for knitwear and, in the process, replaces part of the ink or paint formulation.

[0008] Novelty and Purpose of the Invention

[0009] The present invention is an improvement of the project disclosed in the patent BR 10 2017 014575 1. Its purpose is to expand the solution of wastes that generate colors, generated by any industrial plant at different stages of the life of the process and the product, which constitutes the novel aspect of the present procedure. In it, with wastes from liquid waste treatment stations, using biological or physico-chemical treatments for wastes such as inks and paints, dispersions, pigments or dyes that have aged during storage, exceeded their useful life or are in a state of organic decomposition, the environmental damage currently caused by their disposal in landfills by traditional methods is extracted and eliminated. Waste means, for example, sludge, residues, or petrochemical sludge.

[0010] In the upgrading process described herein, up to 100%, preferably 0.01% to 100%, of the used dye is replaced by treated sludge, residue, or petrochemical sludge, which can be the actual color enhancer in the recycling process such as textile dyes, paints and inks and can be selected as a new product to be included because it becomes a colorant after addition. For example, it can be used as a color equalizer for cotton knitted fabrics, replacing the methods used today. DETAILED DESCRIPTION

[0011] The generation of color wastes in any plant and at different process stages and points during the life of the product is a novel aspect of the present method, where the wastes come from liquid waste treatment stations, paints, inks, dispersions, pigments or dyes treated biologically or physico-chemically, aged in storage, past their use-by date, or aged in organic composting stations

[0012] As proposed by the present specification, the waste recycling method described in the present specification and resulting from the treatment of water used to formulate dyes, pigments and dispersions includes a liquid waste treatment and recovery station. For the purpose of the present invention, liquid waste will be understood as generated during industrial processes, characterized by dyes, prints and other sediments used in the textile dyeing process.

[0013] At the treatment and recovery station, chemical products are added to the liquid waste so that particles and dyes settle at the bottom of the decantation bucket. The treatment begins with the addition of chlorine to the water to accelerate the removal of organic matter and metals, followed by a pre-alkalization step in which lime or soda is added to adjust the pH; a coagulation stage when aluminum sulfate, ferric chloride or some other coagulant is added, followed by rapid stirring of the water to cause electrical destabilization of the dirt particles for faster agglomeration. After this procedure, a flocculation step is performed, which is slowly mixed into the water and causes the formation of flocs with particles. A decantation step is then performed in which the water flows through a large trough to decant the dirt flocs formed in the flocculation stage, followed by a filtration step in which the water passes through a trough with a bed of stones, sand, and charcoal, which captures any dirt that slips through the decantation stage. At the end of the method, liquid waste is obtained.

[0014] The waste generated is directed to a drying box and after drying, these chemical wastes are sent to the method proposed by the invention, which upgrades them for return to the production of inks and lacquers. The treated waste will be able to constitute up to 100% of the dye or color balancer used.

[0015] The method described herein comprises the following steps:

[0016] - providing, in liquid, paste or solid form, sludge, residues or petrochemical sludge resulting from the biological, chemical or physico-chemical treatment of said waste;

[0017] - drying the sludge, residue, or petrochemical sludge; and

[0018] -Introduction of antimicrobial additives;

[0019] wherein the treated sewage sludge, residue, or petrochemical sludge is fully utilized; and

[0020] Therein, treated sewage sludge, residues, or petrochemical sludge is added directly to the formulation during dyeing, is used in its own production chain, or is used for another use to be explored.

[0021] In a preferred embodiment, the antimicrobial additive is any compound that causes the formation of formaldehyde during the process.

[0022] The residue (waste) is completely used and added directly to the formulation during dyeing. In other words, the residue becomes a product added directly from drying (processing) to the dyeing equipment without other changes to the process and does not need to be a pre-treatment for dyeing, thus shortening the time and eliminating the risk of errors.

[0023] In an embodiment of the present invention, the method further comprises adding a compound selected from the selected group of silver nanomolecules, surfactants, wetting agents or mixtures thereof to the residue after the residue has been dried and the antimicrobial additive has been introduced.

[0024] In a preferred embodiment of the present invention, the surfactant and / or wetting agent is surface active.

[0025] In an even more preferred embodiment of the present invention, the surface active surfactant and / or wetting agent is selected from the group comprising:

[0026] (a) Cationic agents - such as quaternary ammonium,

[0027] b) anionic agents - such as sodium lauryl phosphate; or

[0028] c) Nonionics - such as uncharged hydrophilic groups or amphoteric - N-alkyl and C-alkyl betaines and sultaines, and aminophosphatidyl alcohols, or salts thereof, attached to a fatty chain.

[0029] These compounds transform waste into products that do not lose their colorimetric properties before reuse.

[0030] In an alternative embodiment, no further compound is added and the process is carried out in an acidic medium with a pH below 5, or in an alkaline medium with a pH above 8.5.

[0031] As a color equalizer it is used completely in the cotton wash state, meaning 100%, preferably 0.01% to 100%, being able to use the dyes obtained by our process to replace the entire process with a single dyeing stage as an alternative to the very expensive and highly polluting current process.

[0032] In the textile industry, it is used as a dye as well as an additive that will help provide color during the dyeing stage, helps reduce salts in formulations, and also as a pigment during the printing process in the textile industry, as a color-blocking additive.

[0033] It is also used in the textile industry as a final dye for fibers and knitted fabrics.

[0034] It also serves as a dye with microbiological properties, which will allow for better sales, use and advantages of the dye presented after [comparison] of the present invention with the first used dyes.

[0035] This specification describes an invention having industrial applicability, novelty, and inventive step, which meets all requirements prescribed by law for obtaining the claimed privileges.

Claims

1. A method for recycling waste from treatment plants of industries producing pigments, dyes, anilines and toners, characterized in that The method comprises: - providing, in liquid, paste or solid form, sludge, residue or petrochemical sludge resulting from the biological, chemical or physico-chemical treatment of said waste; - drying the sludge, residue, or petrochemical sludge; and - adding an antimicrobial additive, wherein the antimicrobial additive is silver nanomolecules; wherein the treated sewage sludge, residue, or petrochemical sludge is fully utilized; and The treated sludge, residue or petrochemical sludge is added directly to the preparation during dyeing, used in its own production chain or in the use link to be explored.

2. The method according to claim 1, characterized in that The method comprises adding a compound selected from the group consisting of silver nanomolecules, surfactants, wetting agents or mixtures thereof.

3. The method according to claim 2, characterized in that The surfactants and / or wetting agents are surface active.

4. The method according to claim 3, characterized in that The surface active surfactant and / or wetting agent is selected from the group consisting of cationic, anionic and nonionic options.

5. The method according to claim 4, characterized in that The cationic surface-active surfactant and / or wetting agent is a quaternary ammonium.

6. The method according to claim 5, characterized in that The anionic surfactant and / or wetting agent is sodium lauryl acid or its salt.

7. The method according to claim 4, characterized in that The surface-active nonionic surfactants and / or wetting agents are uncharged hydrophilic groups or amphoteric N-alkyl and C-alkyl betaines and sultaines, amino alcohol phosphatidyls, or salts thereof attached to fatty chains.

8. The method according to claim 1, characterized in that The process is carried out in an acidic medium with a pH below 5, or in an alkaline medium with a pH above 8.

5.

9. Use of treated sewage sludge, residue or petrochemical sludge as defined in any one of claims 1 to 8, characterized in that It is similar to a color equalizer in fibers, completely replacing the lacquer from 0.01% to 100%, depending on the amount required for each fiber.

10. Use of treated sewage sludge, residue or petrochemical sludge as defined in any one of claims 1 to 8, characterized in that It is similar to the color enhancing additives used in the textile industry.

11. The use according to claim 10, characterized in that It is a reactive color enhancing dye, in which case it is used in an amount of up to 100% of the total dye used.

12. The use according to claim 10 or 11, characterized in that It is a direct color enhancing dye, in which case it is used in an amount of up to 100% of the total dye used.