WO2014170924A1 - Installation et procédure de récupération d'alcool polyvinylique d'un bain de lavage dans l'industrie textile - Google Patents

Installation et procédure de récupération d'alcool polyvinylique d'un bain de lavage dans l'industrie textile Download PDF

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Publication number
WO2014170924A1
WO2014170924A1 PCT/IT2014/000110 IT2014000110W WO2014170924A1 WO 2014170924 A1 WO2014170924 A1 WO 2014170924A1 IT 2014000110 W IT2014000110 W IT 2014000110W WO 2014170924 A1 WO2014170924 A1 WO 2014170924A1
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WO
WIPO (PCT)
Prior art keywords
station
pva
liquid
filtering
plant
Prior art date
Application number
PCT/IT2014/000110
Other languages
English (en)
Inventor
Massimiliano PREVIDI
Original Assignee
EURO MEC S.r.I.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EURO MEC S.r.I. filed Critical EURO MEC S.r.I.
Priority to EP14739953.9A priority Critical patent/EP2986569A1/fr
Publication of WO2014170924A1 publication Critical patent/WO2014170924A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/149—Multistep processes comprising different kinds of membrane processes selected from ultrafiltration or microfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/22—Treatment of water, waste water, or sewage by freezing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/147—Microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Definitions

  • the present invention relates to a plant and procedure for the recovery of Polyvinyl Alcohol from the washing bath in the textile industry particularly suitable to separate the Polyvinyl Alcohol (PVA) from the wastewater in the thread washing bath.
  • PVA Polyvinyl Alcohol
  • PVA is used in the textile industry to make the thread more compact so that the different strands, of which it is made up, are grouped together making the thread more resistant and easier to use in the spinning process.
  • the PVA is discharged together with the other waste into the water, which is then conveyed to the treatment process.
  • the washing bath containing PVA is generally discharged in the wastewater treatment plants and the presence of this substance considerably worsens the chemical-physical characteristics and often makes the water difficult to treat or even makes it unbeatable, since PVA is poorly biodegradable and is not compatible with the treatment plants that are generally of the biological type.
  • PVA has a very high COD (chemical oxygen demand) level therefore it is considered a major pollutant and its presence in processing waste has always generated serious plant management problems as it causes, for example in biological plants, the growth of filamentous bacteria that are difficult to separate; this results in a significant increase in plant management operating costs.
  • COD chemical oxygen demand
  • PVA undermines the treatment plants as the waste must be chemically treated before being discharged into the environment, but such treatments do not give the expected results and moreover they create many problems.
  • the technologies mainly adopted concern the recovery of dyeing wastewater, downstream of the activated sludge biological treatment; the most limiting factor however for the use of these technologies is the concentration of PVA that makes biological systems difficult to manage, also due to the high operating costs resulting from the considerable consumption of electricity. Furthermore, the presence of PVA makes it difficult to adopt processes that employ membrane filtration downstream of biological treatment systems.
  • the object of the present invention is substantially to solve the problems of the known technique overcoming the above mentioned difficulties by means of a plant and procedure for the recovery of polyvinyl alcohol from the washing bath in the textile industry, which enables the recovery of water in order to obtain hot clean water at a temperature of 70-80° C.
  • a second object of the present invention is to achieve a plant and procedure for the recovery of polyvinyl alcohol from the washing bath in the textile industry, which enables the separation of the PVA from the water and its gelification, to take it to a solid state so that it can be reused in other industrial processes.
  • Another object of the present invention is to achieve a plant and procedure for the recovery of polyvinyl alcohol from the washing bath in the textile industry that enables wastewater, with a considerably lower concentration of pollutants, to be sent to the centralised treatment plant, with a reduction in management and plant costs.
  • a further object of the present invention is to achieve a plant and procedure for the recovery of polyvinyl alcohol from the washing bath in the textile industry that enables the recovery, upstream of the centralised treatment plant, of hot water, resulting in a substantial recovery in energy and consequently in lower plant and operating costs.
  • FIG. 1 shows a diagram of a plant for the recovery of polyvinyl alcohol from the washing bath in the textile industry that is the object of the present invention for the development of the PVA recovery process.
  • the plant 1 substantially consists of a number of stations, of which the first station 2 comprises a screening and accumulation section, the second station 3 comprises a filtering section and the third station 4 comprises a gelification section.
  • the plant 1 of which the first station 2 consists of the screening and accumulation section comprises a series of grilles 20 foreseen to carry out a first filtering phase to prevent suspended solids, such as threads, from entering and passing into the following stations of the system creating mechanical problems to the system, and comprises an accumulation tank 21 with the task of collecting the liquids from the thread washing bath. More in detail, the tank 21 is made of concrete with plastic or epoxy protection or made of fibreglass or plastic material or stainless steel with the task of maintaining a constant flow of water to the following filtering station.
  • the material collected by the grilles 20 is conveyed towards the waste and disposed of.
  • the second station 3 consisting of the filtering section comprises a first pumping station 30, envisaged to send the liquids to be treated to a first filtering unit 31, of the microfiltration type, which has the task of removing any fibres or any suspended solids present in the liquid, with a more accurate filtering action with respect to the grilles 20 and to a second filtering unit 32 of the ultrafiltration type.
  • the second filtering unit 32 consists of at least one module comprising an ultrafiltration apparatus 32 and a second pumping station 33 envisaged for the recirculation of the liquid.
  • the ultrafiltration apparatus 32 consists of tubular ceramic membrane elements with the task of removing the P VA and separating it from the water through different phases until a permeate of clean water is obtained.
  • the recirculation of the liquid is carried out to maintain a high tangential velocity of the liquid on the membranes and therefore to constantly clean them and the filtering surface to prevent them from getting dirty quickly.
  • the various recirculations are determined according to the features of the membranes used.
  • the passage through the ceramic membrane elements generates on one side a flow of clean water (permeate) which is sent to a tank 26 for reuse and, on the other side, a flow (concentrate) that is sent to the following gelification station 4.
  • the first pumping station 30 is made of stainless steel or marine bronze and supplies the filtering section.
  • the first filtering unit 31 is made of plastic or stainless steel and has a filtering level of 250 ⁇ .
  • the second pumping station 33 is made of stainless steel or marine bronze and makes the liquid circulate on the membrane elements.
  • the ultrafiltration apparatuses 32 are located in stainless steel containers and include tubular ceramic membrane elements that guarantee the separation of the PVA from the water through high temperature filtering. As previously mentioned, the ultrafiltration modules operate at a high temperature and the permeate is sent at a temperature of 70-80° C to an insulated storage tank 26 to avoid heat dispersion.
  • the plant in question 1 features a filtering unit 32 consisting of a series of ultrafiltration modules 32, shown in figure 1, each of which features its own pumping station 33.
  • the said plurality of modules and the different passages of the liquid through the ceramic membrane have the task of further separating the PVA from the water, concentrating it in an increasingly smaller amount of liquid.
  • the number of elements varies according to the quantity of clean water and of PVA separated from the water to be obtained and according to the size and capacity that the plant must have.
  • clean water is discharged from the various stages and passages, which is sent to the tank 26, while the remaining water is increasingly loaded with PVA.
  • second pumping station 33 is envisaged for the recirculation and pressurisation of the liquid, to favour a high tangential velocity of the liquid, similarly to what occurs in the pumping station 30.
  • the plant features the third station 4 that comprises a PVA gelification section that consists of a PH control device 40 made up of one or more dosing pumps and of a tank for acid made of plastic material.
  • the adjustments of the PH of the concentrate is carried out by a dedicated pump of the proportional type which adjusts the PH by dosing the sulphuric acid to bring the concentrate to a neutral state.
  • the gelification section includes a concentrate collection tank 41 made of concrete with plastic or epoxy protection or made of fibreglass or plastic material or stainless steel, a pumping station 42 to supply a gelification device 43 that comprises gelification cylinders in which the PVA is cooled and passes from a liquid to a solid state.
  • the plant comprises a fourth station that is the membrane cleaning section that features a washing tank, which is the tank 26 made of plastic or stainless steel, foreseen to clean the membranes, in which dedicated pumps are used, or the supply pumps of the respective sections.
  • a washing tank which is the tank 26 made of plastic or stainless steel, foreseen to clean the membranes, in which dedicated pumps are used, or the supply pumps of the respective sections.
  • the cleaning of the membranes is carried out using chemical substances duly diluted in the special tank and fluxed according to a particular procedure through the membranes to obtain complete cleaning thereof through the elimination by removal of the substances deposited on them.
  • the plant 1 features a series of instruments such as flow meters of the permeate and concentrate, also according to the supply, located on the lines in the first and second station, pressure gauges at the input and output of the membranes, temperature gauges in each tank and a concentrate pH meter.
  • instruments such as flow meters of the permeate and concentrate, also according to the supply, located on the lines in the first and second station, pressure gauges at the input and output of the membranes, temperature gauges in each tank and a concentrate pH meter.
  • a further characteristic of the plant according to the present invention is a particular system that allows the plant to be completely emptied if there is a sudden power cut, avoiding that the PVA, cooling down, clogs the ceramic membrane elements and the pumping stations and filtering stations in general.
  • the plant 1 has the task of separating the PVA present in the thread washing baths from the water, to recover clean water and energy and to recover the PVA for other uses in a variety of other production processes, such as, for example, paper production, asphalt production, etc.. and / or for other purposes.
  • the plant does not overload and put a strain on discharge treatment plants since the effluent sent to the centralised treatment plant has a considerably lower load of highly polluting substances.
  • the plant and the procedure developed with the plant according to the present invention allow the costs of the centralised treatment plant to be contained but, above all, the operating costs are reduced and considerable savings are obtained on the consumption of water used in the various processes.
  • the plant according to the present invention allows the following process to be performed to recover the PVA molecules from the thread washing baths as schematically shown in figure 1.
  • the PVA recovery procedure includes the following operational phases:
  • the flow rate of the permeate is guaranteed, managed and controlled by the back pressure generated by the pump 30 and by a valve installed on the concentrate recirculation line.
  • a part of the permeate (clean water) is continuously tapped and sent to the tank 26, while the concentrate continues into the ultrafiltration unit.
  • the separation and recovery procedure continues with the following stages: adjustment of the PH of the liquid by dosing of sulphuric acid, sending of the concentrate to a storage tank 41 , - pumping of the concentrate through a cooling and gelification system in which the PVA passes from a liquid state to gel through the reduction of temperature recovery and reuse of the PVA.
  • the liquid When washing operations of the threads for textiles are complete and the bath is drained, the liquid must be treated to eliminate and recover the PVA it contains, so the water can be reused in subsequent stages and the PVA can be used in other industrial processes.
  • a high temperature treated water is obtained that is reused in subsequent processes, as well as a quantity of concentrate composed of PVA gel that is stored to be subsequently used in other sectors such as, for example, paper production, asphalt production, etc.
  • the effluent sent to the centralised treatment plant has a considerably lower load of polluting substances.
  • the plant for the separation and recovery of PVA in the thread bleaching process in question allows a recovery of over 90% of water perfectly free from PVA, decolorized and with a low salt content and still at a high temperature (70-80 0 C), which can be reused in the production process.
  • the plant offers the possibility to send to the centralised treatment plant an effluent with a considerably lower load of polluting substances, with lower system and operating costs.
  • the plant according to the present invention allows the recovery, downstream of the centralised treatment plant, of a greater amount of water at lower costs.
  • the plant and procedure allow the polyvinyl alcohol to be separated and recovered in gel form, upstream of the treatment plants, which was not previously possible.
  • the overall PVA recovery factor is between 90-100 % and what is recovered can be reused in various manufacturing processes in other sectors.
  • the residual wastewater obtained has a high concentration of PVA which cannot be discharged in wastewater treatment plants or disposed of, so it is recovered or even sold at an affordable cost.
  • Another advantage of the plant derives from the fact that the system in question can be used at high temperatures, avoiding the risk of gelification of PVA that would clog every type of membrane making it unusable, hot-separates the PVA molecules making them available in a concentrated state and then obtains a solid product that can be reused both in the textile industry and in other industrial processes.
  • the plant and procedure in question prevent the problems that effluent treatment plants previously had; in fact, previously, when the PVA was discharged there was an immediate and sudden increase of COD, which was difficult to manage and forced the workers to close down the plants to clean them.
  • the plant and procedure provide greater recovery and recycling of water, which can then be used in the process at lower cost.
  • a further advantage of the plant is that it meets a growing need, which is the increasing demand for the recovery of substances through efficient and reliable processes. Furthermore, over time, the plant offers savings on the management costs of the bleaching process because the cost of the recovery of PVA from the wastewater, which was exorbitant, is drastically reduced.
  • a further but not final advantage of the present invention is that it proves remarkably easy to use and to manufacture and works well.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne une installation et une procédure de récupération d'alcool polyvinylique (PVA) d'un bain de lavage dans l'industrie textile. Le système comporte plusieurs stations, la première station (2) comprenant une section de tri et d'accumulation, la deuxième station (3) comprenant une section de filtre qui génère d'un côté un écoulement d'eau propre (perméat) envoyé vers un réservoir isolé (26) et de l'autre côté un écoulement concentré envoyé vers une troisième station (4) qui comprend une section de gélification du PVA, le PVA passant de l'état liquide à l'état solide par abaissement de la température.
PCT/IT2014/000110 2013-04-15 2014-04-15 Installation et procédure de récupération d'alcool polyvinylique d'un bain de lavage dans l'industrie textile WO2014170924A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14739953.9A EP2986569A1 (fr) 2013-04-15 2014-04-15 Installation et procédure de récupération d'alcool polyvinylique d'un bain de lavage dans l'industrie textile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMN2013A000004 2013-04-15
IT000004A ITMN20130004A1 (it) 2013-04-15 2013-04-15 Impianto e processo per il recupero del poli vinil alcool dal bagno di lavaggio nel settore tessile.

Publications (1)

Publication Number Publication Date
WO2014170924A1 true WO2014170924A1 (fr) 2014-10-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2014/000110 WO2014170924A1 (fr) 2013-04-15 2014-04-15 Installation et procédure de récupération d'alcool polyvinylique d'un bain de lavage dans l'industrie textile

Country Status (3)

Country Link
EP (1) EP2986569A1 (fr)
IT (1) ITMN20130004A1 (fr)
WO (1) WO2014170924A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1468928A (en) * 1973-05-10 1977-03-30 Union Carbide Corp Ultrafiltration apparatus and process for the treatment of liquids
US4200533A (en) * 1978-06-28 1980-04-29 Brandon Craig A Hyperfiltration apparatus and method of fluid treatment
US4734097A (en) * 1981-09-25 1988-03-29 Nippon Oil Company, Ltd. Medical material of polyvinyl alcohol and process of making
WO2013035123A1 (fr) * 2011-09-07 2013-03-14 EURO MEC S.r.L Installation et procédure pour la récupération de saumure usée à partir de cuves de teinture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1468928A (en) * 1973-05-10 1977-03-30 Union Carbide Corp Ultrafiltration apparatus and process for the treatment of liquids
US4200533A (en) * 1978-06-28 1980-04-29 Brandon Craig A Hyperfiltration apparatus and method of fluid treatment
US4734097A (en) * 1981-09-25 1988-03-29 Nippon Oil Company, Ltd. Medical material of polyvinyl alcohol and process of making
WO2013035123A1 (fr) * 2011-09-07 2013-03-14 EURO MEC S.r.L Installation et procédure pour la récupération de saumure usée à partir de cuves de teinture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PORTER J J: "Recovery of polyvinyl alcohol and hot water from the textile wastewater using thermally stable membranes", JOURNAL OF MEMBRANE SCIENCE, ELSEVIER SCIENTIFIC PUBL.COMPANY. AMSTERDAM, NL, vol. 151, no. 1, 9 December 1998 (1998-12-09), pages 45 - 53, XP004152782, ISSN: 0376-7388, DOI: 10.1016/S0376-7388(98)00236-1 *

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Publication number Publication date
EP2986569A1 (fr) 2016-02-24
ITMN20130004A1 (it) 2014-10-16

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