CN114538691A - Water-based waterproof coating wastewater treatment process - Google Patents

Water-based waterproof coating wastewater treatment process Download PDF

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CN114538691A
CN114538691A CN202210245525.6A CN202210245525A CN114538691A CN 114538691 A CN114538691 A CN 114538691A CN 202210245525 A CN202210245525 A CN 202210245525A CN 114538691 A CN114538691 A CN 114538691A
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reverse osmosis
water
waterproof coating
based waterproof
emulsion
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CN114538691B (en
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常志
王勇
陈鸯飞
马伟伟
张冬冬
李超
王威
孟玉
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Hongyuan Waterproof Technology Group Co ltd
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Hongyuan Waterproof Technology Group Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B01D1/18—Evaporating by spraying to obtain dry solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D19/00—Degasification of liquids
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    • B01D19/04—Foam dispersion or prevention by addition of chemical substances
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    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
    • C02F1/12—Spray evaporation
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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    • 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
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    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/14—Paint wastes
    • 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
    • C02F2209/03—Pressure
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2303/16—Regeneration of sorbents, filters
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    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

The invention provides a water-based waterproof coating wastewater treatment process, which comprises the steps of plate-and-frame filter pressing, ceramic membrane filtration, powder drying, RO reverse osmosis concentration, colloid mill passing and spray drying; and (3) plate and frame filter pressing: introducing the water-based waterproof coating wastewater into a plate-and-frame filter press for filtering treatment to obtain a concentrated solution A and wastewater A; and (3) filtering by using a ceramic membrane: introducing the wastewater A subjected to the plate-and-frame filter pressing process into a ceramic membrane device for microfiltration, and performing microfiltration to obtain a concentrated solution B and wastewater B; and (3) RO reverse osmosis concentration: and (3) introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration to obtain pure deionized water and emulsion. And adding an anti-caking agent into the emulsion after the emulsion is subjected to colloid mill and spray drying to obtain the redispersible emulsion powder. And drying the concentrated solution A and the concentrated solution B to obtain the filler powder. The process of the invention has no waste generation and zero emission, and can obtain high-quality filler powder and redispersible emulsion powder.

Description

Water-based waterproof coating wastewater treatment process
Technical Field
The invention relates to a water-based waterproof coating wastewater treatment process, and belongs to the technical field of waterproof coatings.
Background
The water-based waterproof coating can generate a large amount of wastewater in the production process, and the source of the wastewater is mainly divided into two parts: firstly, cleaning wastewater of production equipment; second, the process effluent produced in the production run; these waste waters are collectively referred to as aqueous waterproofing coating waste waters.
Because the production scale of the coating industry is small, the variety is large, intermittent discharge is adopted, the fluctuation of water quality and water quantity is large, and the wastewater contains various high polymers and organic compounds which are difficult to be biochemically degraded. The wastewater belongs to high-concentration organic wastewater, and has high chroma, high turbidity and high Chemical Oxygen Demand (COD); in the treatment process of the wastewater, the problems that COD is continuously higher, complete demulsification cannot be realized, turbidity is difficult to reduce, wastewater discharge does not reach the standard and the like are often encountered.
The water-based waterproof paint wastewater contains a large amount of latex particles, organic additives, pigments, fillers and other components. The treatment difficulty of the coating wastewater is higher.
At present, the main treatment methods of waste water discharged by coating production at home and abroad are a coagulating sedimentation method, an adsorption method, a biological method, a small part of advanced oxidation method and the like, and although harmful waste water is treated to the discharge standard level, manufacturers consume a large amount of manpower and financial resources to treat the waste water, and finally need to discharge a large amount of waste water.
The prior art disclosed in the published documents cn201210100360.x, such as a method for recycling sludge from the production wastewater of water-based paint and a method for reprocessing the production wastewater of CN201210100367.1 water-based paint, cannot separate and effectively utilize components in the production wastewater of water-based paint, although the wastewater is purified to a certain extent, and has little production significance and low value.
Therefore, the development and research of the water-based waterproof coating wastewater treatment method which has strong removal rate, does not bring secondary pollution to water and can obtain a higher-quality product becomes the key point of research in the industry.
Disclosure of Invention
Aiming at the technical problems, the invention provides a water-based waterproof coating wastewater treatment process, which achieves the following aims: the water-based waterproof coating wastewater can be utilized by 100 percent, no wastewater is generated in the treatment process, zero emission is really realized, and the process is simple; the filler powder and the redispersible latex powder obtained by treatment have good quality and can be used as production raw materials of waterproof mortar.
In order to achieve the purpose of the invention, the following technical scheme is adopted:
a water-based waterproof coating wastewater treatment process comprises the following steps:
step 1, plate and frame filter pressing
Introducing the water-based waterproof coating wastewater (namely wastewater generated in the production process of the water-based waterproof coating) into a plate-and-frame filter press for filtering treatment, and controlling the pressure of the plate-and-frame filter press to be 0.1-0.16MPa to obtain a concentrated solution A and wastewater A.
The plate-and-frame filter press comprises: the filter cloth with the aperture of 30-50 microns is adopted and is made of polyacrylonitrile fiber with the surface coated with silicon nitride. The filter cloth can effectively intercept granular pigment and filler in the filter pressing process.
The specific filter cloth of this process cooperates with the frame pressure can carry out effective separation with pigment filler and latex particle simultaneously, does not hold back or the adhesion latex particle, effectively reduces the loss of latex particle. The process mainly has the function of effectively intercepting granular solid matters such as pigments, fillers and the like.
Step 2, ceramic membrane filtration
And (3) introducing the wastewater A subjected to the plate-and-frame filter pressing process into a ceramic membrane device for microfiltration, controlling the inlet pressure of the ceramic membrane device to be 3.5-4.0bar and the outlet pressure to be 1.0-1.4bar, and controlling the compression multiple of the microfiltration by the ceramic membrane device to be 15-20 times, thus obtaining a concentrated solution B and wastewater B after microfiltration.
The ceramic membrane device is provided with 4 groups of membrane stacks, the four groups of membrane stacks are completely the same, the aperture of the adopted ceramic membrane is 50-100nm, and the ceramic membrane mold core is a silicon carbide ceramic tube type ceramic membrane or an alumina tube type ceramic membrane; when wastewater A is guided into the ceramic membrane device for microfiltration, the wastewater flows through 3 groups of membrane stacks in sequence, and 1 group of membrane stacks are in a standby state.
This procedure removes the remaining impurities other than the latex particles and the trace of the adjuvant molecules.
Step 3, drying the powder
Mixing concentrated solution A and concentrated solution B obtained after plate-and-frame filter pressing and ceramic membrane filtration, and drying the mixed solid by a fluidized bed, wherein the air inlet temperature of the fluidized bed is 120-140 ℃ and the air outlet temperature is 50-65 ℃; crushing the dried solid by grinding equipment; and (3) screening the crushed solid by a vibrating screen to obtain a filler powder, wherein the vibrating screen comprises the following steps: the power of the vibration motor is 5.0 +/-0.5 kw, and the aperture of the vibration sieve is 200 meshes and 800 meshes.
Step 4, RO reverse osmosis concentration
Introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration, including primary reverse osmosis and secondary reverse osmosis; wherein: in the first-stage reverse osmosis, the membrane inlet pressure is less than or equal to 3.5MPa, the concentration ratio is more than 55 percent, and the solid content is controlled to be 50-55 percent. In the second-stage reverse osmosis, the membrane inlet pressure is less than or equal to 3.0MPa, the concentration ratio is more than 85 percent, and the solid content is controlled to be 48-52 percent. The wastewater is concentrated by reverse osmosis to obtain pure deionized water and emulsion (namely latex liquid).
The RO reverse osmosis concentration system adopts a plate-type reverse osmosis membrane, and the membrane core is made of modified polyamide, carbon nanotube grafted polyvinylidene fluoride (PVDF) and carbon fiber according to the weight ratio of 3-5: 3-5: 1.5-2.5, and processing after mixing.
The pure deionized water can be returned to the production process of the water-based waterproof coating for recycling.
Step 5, passing through a colloid mill
Adding a defoaming agent, a spray drying auxiliary agent, a bactericide and a protective colloid into the emulsion obtained in the RO reverse osmosis concentration process, then grinding and mixing in a colloid mill, discharging after a stable and uniform colloid is achieved, and obtaining a colloid concentrated solution.
The defoaming agent comprises the following components: the active component is high carbon aromatic alcohol, and the addition amount of the antifoaming agent is 4.5-5.5 per mill of the mass of the emulsion;
the spray drying auxiliary agent is glutaraldehyde modified polyvinyl alcohol, and the addition amount of the spray drying auxiliary agent is 1.8-2.2 per mill of the mass of the emulsion;
the bactericide is a benzimidazole bactericide or an isothiazolinone bactericide, and the addition amount of the bactericide is 1.8-2.4 per mill of the mass of the emulsion;
the protective colloid is guar gum grafted modified polyvinyl alcohol or xanthan gum grafted modified polyvinyl alcohol or a mixture of the guar gum grafted modified polyvinyl alcohol and the xanthan gum grafted modified polyvinyl alcohol, and the addition amount of the protective colloid is 4.5-5.5% of the mass of the emulsion.
Step 6, spray drying
Drying the colloid concentrated solution by spray drying equipment, wherein the inlet temperature of the spray drying equipment is 115-130 ℃, the outlet temperature of the spray drying equipment is 55-70 ℃, and the rotation speed of an atomizer is 20000-21000rpm, and drying to obtain the rubber powder.
Adding an anti-caking agent into the rubber powder obtained by spray drying, wherein the addition amount is 6-8% of the mass of the rubber powder, and uniformly mixing; and obtaining the redispersible latex powder.
The anti-caking agent is any one of kaolin, modified kaolin, diatomite and calcium carbonate; preferably a fluorosilicone modified kaolin. The fluorine-silicon modified kaolin: the kaolin particles are coated with fluorine-silicon copolymer resin on the surface, and the mass ratio of the kaolin to the fluorine-silicon copolymer resin is 40: 0.8-2.
The product of the invention comprises the filler powder obtained by drying the powder in the step 3 and the redispersible latex powder obtained in the step 6; can be used as a raw material for producing waterproof mortar and can be directly used for producing dry powder waterproof mortar.
The invention achieves the following beneficial effects:
1) outstanding environmental protection performance
The deionized water after the wastewater is treated can be reused for the production of the water-based waterproof coating; deionized water preparation: turbidity of 0 NTU, pH of 6.9-7.5, and conductivity of 4.6-4.8 us/cm. The pigment and the filler in the wastewater are used as raw materials of the dry powder waterproof mortar after being filtered, dried, crushed and sieved; the latex particles in the wastewater are concentrated and spray-dried to obtain the re-dispersible latex powder used as the raw material of the dry powder waterproof mortar. No secondary waste is generated in the whole wastewater treatment process, and the wastewater is reused by 100% after being treated, so that zero discharge is really realized.
2) Low investment in equipment and running cost
The process is simple, the equipment investment cost and the operation cost are low, the equipment is put into once, and no chemical reagent is added or strains are replaced in the operation process. Greatly reduces the investment of the company and lightens the environmental protection pressure of the company.
3) Creating a certain economic benefit
The purified water obtained by wastewater treatment can be reused, and the obtained filler powder and redispersible latex powder can be used as high-quality raw materials for producing dry powder waterproof mortar.
The filler powder prepared by the invention comprises the following components: the appearance is white or gray powder without agglomeration, the mesh number is 300-800 meshes, the moisture content is less than 0.5 percent, the ignition loss is 5-5.6 percent, and the oil absorption is 2.6-2.9 g/100 g. The redispersible latex powder prepared by the invention comprises the following components: white powder in appearance, particle size: the content of particles with the particle diameter of more than 400um is not more than 4 percent; the residue of ignition residue is less than or equal to 13 percent, the bulk density is 470-650 g/L, and the nonvolatile content is more than 98 percent. The filler powder and the redispersible latex powder obtained by the wastewater treatment of the invention can meet the requirements of preparing JC/T984-2011 'Polymer Cement waterproof mortar' single-component mortar (S type) on raw materials, and completely meet the preparation requirements of waterproof mortar. The filler powder and the redispersible latex powder obtained by the wastewater treatment of the invention can also be used for preparing related ceramic tile adhesives in JC/T547-2017 ceramic tile adhesive, and the performance can also completely meet the requirements of standard products on raw materials. In addition, thermal insulation mortar, repair mortar, self-leveling mortar and the like can also be used, and the application range is wide.
The method is beneficial to reducing the investment of manufacturers and improving the market competitiveness, and also meets the requirements of national green and low-carbon environmental protection policies. Moreover, if the process is reasonably set, the waste can be recycled, zero emission is really realized, and certain extra benefits are brought to manufacturers. This is particularly evident in the production process of water-based waterproof coatings.
Drawings
FIG. 1 is a flow chart of a wastewater treatment process for an aqueous waterproof coating material of the present invention.
Detailed Description
Example 1 Water-based waterproof coating wastewater treatment process
Taking the wastewater treatment in the production process of the polymer emulsion building waterproof coating as an example:
a water-based waterproof coating wastewater treatment process comprises the following steps:
step 1, plate and frame filter pressing
And (3) introducing the water-based waterproof coating wastewater into a plate-and-frame filter press for filtering treatment, and controlling the pressure of the plate-and-frame filter press to be 0.1MPa to obtain a concentrated solution A and wastewater A. The water-based waterproof coating wastewater: is the waste water produced in the production process of the polymer emulsion building waterproof coating.
The plate-and-frame filter press comprises: the filter cloth with the aperture of 50 microns is adopted, the filter cloth is made of polyacrylonitrile fibers with the surfaces coated with silicon nitride, and the coating thickness of the silicon nitride is 5 microns. The filter cloth can effectively intercept granular pigment and filler in the filter pressing process.
Step 2, ceramic membrane filtration
And (3) introducing the wastewater A subjected to the plate-and-frame filter pressing process into a ceramic membrane device for microfiltration, controlling the inlet pressure to be 3.5bar, the outlet pressure to be 1.0bar and the compression multiple of microfiltration to be 15 times, and performing microfiltration to obtain a concentrated solution B and wastewater B.
The ceramic membrane device is provided with 4 groups of membrane stacks, the four groups of membrane stacks are completely the same, the aperture of the adopted ceramic membrane is 100nm, and the ceramic membrane mold core is a silicon carbide ceramic tube type ceramic membrane; wherein 3 membrane piles are working membrane piles, 1 membrane pile is the washing membrane pile, and when leading-in ceramic membrane device of waste water A carries out the micro-filtration, waste water flows through 3 working membrane piles in proper order.
This procedure removes the remaining impurities other than the latex particles and the trace of the adjuvant molecules.
Step 3, drying the powder
Mixing concentrated solution A and concentrated solution B obtained by plate-and-frame filter pressing and ceramic membrane filtration, and drying the mixed solid by a fluidized bed, wherein the air inlet temperature of the fluidized bed is 120 ℃, and the air outlet temperature of the fluidized bed is 50 ℃; crushing the dried solid by grinding equipment; and (3) sieving the crushed solid to obtain filler powder, wherein the power of a vibration motor is 5.0kw, and the aperture of the vibration sieve is 280 meshes.
Step 4, RO reverse osmosis concentration
Introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration, including primary reverse osmosis and secondary reverse osmosis; wherein: in the first-stage reverse osmosis, the membrane inlet pressure is 3.5MPa, the concentration ratio is 58 percent, and the solid content is controlled to be 55 percent. In the secondary reverse osmosis, the membrane inlet pressure is 3.0MPa, the concentration ratio is 87 percent, and the solid content is controlled to be 52 percent. The wastewater is concentrated by reverse osmosis to obtain pure deionized water and latex liquid (namely emulsion).
RO reverse osmosis concentrated system, adopt board-like reverse osmosis membrane, the membrane core material is by modified polyamide, carbon nanotube grafting polyvinylidene fluoride (PVDF) and carbon fiber according to 4: 4: 2, and mixing the components in a mass ratio.
The pure deionized water can be returned to the production process of the water-based waterproof coating for recycling. And (3) carrying out water quality detection on the deionized water, wherein the detection result is as follows: turbidity was 0 NTU, pH 6.9 and conductivity 4.8 us/cm.
Step 5, passing through a colloid mill
Adding a defoaming agent, a spray drying auxiliary agent, a bactericide and a protective colloid into the latex liquid obtained in the RO reverse osmosis concentration process, then grinding and mixing in a colloid mill, discharging after a stable and uniform colloid is achieved, and obtaining a colloid concentrated solution.
The defoaming agent comprises the following components: the active component of the emulsion is high-carbon aromatic alcohol, and the addition amount of the antifoaming agent is 5 per mill of the mass of the emulsion;
the spray drying auxiliary agent is glutaraldehyde modified polyvinyl alcohol, and the addition amount of the spray drying auxiliary agent is 2 per mill of the mass of the emulsion;
the bactericide is a benzimidazole bactericide, and the addition amount of the bactericide is 2 per mill of the mass of the emulsion;
the protective colloid is guar gum graft modified polyvinyl alcohol, and the addition amount of the protective colloid is 5% of the mass of the emulsion.
Step 6, spray drying
Drying the colloid concentrated solution by spray drying equipment, setting the inlet temperature of the spray drying equipment at 115 ℃, the outlet temperature at 55 ℃ and the rotation speed of an atomizer at 20000rpm, and drying to obtain the rubber powder.
Adding an anti-caking agent into the rubber powder obtained by spray drying, wherein the adding amount is 6 percent of the mass of the rubber powder, and uniformly mixing; and obtaining the redispersible latex powder.
The anti-caking agent is diatomite.
The product prepared in this embodiment includes the filler powder obtained in step 3 and the redispersible latex powder obtained in step 6; the filler powder and the redispersible latex powder are detected, and the detection results are recorded as shown in the table 1-2:
TABLE 1 Filler powder Performance index test results
Figure 467083DEST_PATH_IMAGE001
TABLE 2 redispersible latex powder Performance test results
Figure 787819DEST_PATH_IMAGE002
As can be seen from tables 1-2, the filler powders prepared in this example: the appearance is white, no caking exists, the mesh number is 300 meshes, the moisture content is 0.5 percent, the loss on ignition is 5 percent, and the oil absorption is 2.6g/100 g. The redispersible latex powder prepared in this example: white powder in appearance, particle size: the content of particles with the particle diameter of more than 400um is 3.9 percent; the residue on ignition was 12.8%, the bulk density was 470g/L, and the nonvolatile content was 98.2%.
Example 2 Water-based waterproof coating wastewater treatment process
Taking the wastewater treatment in the production process of the metal roof acrylic acid high-elasticity waterproof coating as an example:
a water-based waterproof coating wastewater treatment process comprises the following steps:
step 1, plate and frame filter pressing
And (3) introducing the water-based waterproof coating wastewater into a plate-and-frame filter press for filtering treatment, and controlling the plate-and-frame pressure to be 0.14MPa to obtain a concentrated solution A and wastewater A. The water-based waterproof coating wastewater: is waste water produced in the production process of the metal roof acrylic acid high-elasticity waterproof coating.
The plate-and-frame filter press comprises: the filter cloth with the aperture of 40 microns is adopted, the filter cloth is made of polyacrylonitrile fibers with the surfaces coated with silicon nitride, and the coating thickness of the silicon nitride is 5 microns. The filter cloth can effectively intercept granular pigment and filler in the filter pressing process.
Step 2, ceramic membrane filtration
And (3) introducing the wastewater A subjected to the plate-frame filter pressing process into a ceramic membrane device for microfiltration, controlling the inlet pressure to be 3.8bar, the outlet pressure to be 1.2bar and the compression multiple of microfiltration to be 17 times, and performing microfiltration to obtain a concentrated solution B and wastewater B.
The ceramic membrane device is provided with 4 groups of membrane stacks, the four groups of membrane stacks are completely the same, the aperture of the adopted ceramic membrane is 80nm, and the ceramic membrane mold core is an alumina tube type ceramic membrane; wherein 3 membrane piles are working membrane piles, 1 membrane pile is the washing membrane pile, and when leading-in ceramic membrane device of waste water A carries out the micro-filtration, waste water flows through 3 working membrane piles in proper order.
This procedure removes the remaining impurities other than the latex particles and the trace of the adjuvant molecules.
Step 3, drying the powder
Mixing concentrated solution A and concentrated solution B obtained by plate-frame filter pressing and ceramic membrane filtration, and drying the mixed solid by a fluidized bed, wherein the air inlet temperature of the fluidized bed is 132 ℃, and the air outlet temperature of the fluidized bed is 56 ℃; crushing the dried solid by grinding equipment; and (3) sieving the crushed solid to obtain filler powder, wherein the power of a vibration motor is 5.5kw, and the diameter of a vibration sieve is 780 meshes.
Step 4, RO reverse osmosis concentration
Introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration, including primary reverse osmosis and secondary reverse osmosis; wherein: in the first-stage reverse osmosis, the membrane inlet pressure is 3.3MPa, the concentration ratio is 55 percent, and the solid content is controlled to be 50 percent. In the second-stage reverse osmosis, the membrane inlet pressure is 2.8MPa, the concentration ratio is 85 percent, and the solid content is controlled to be 48 percent. The wastewater is concentrated by reverse osmosis to obtain pure deionized water and latex liquid (namely emulsion).
RO reverse osmosis concentrated system, adopt board-like reverse osmosis membrane, the membrane core material is by modified polyamide, carbon nanotube grafting polyvinylidene fluoride (PVDF) and carbon fiber according to 4: 4: 2, and mixing the components in a mass ratio.
The pure deionized water can be returned to the production process of the water-based waterproof coating for recycling. And (3) carrying out water quality detection on the deionized water, wherein the detection result is as follows: turbidity was 0 NTU, pH 7.2 and conductivity 4.6 us/cm.
Step 5, passing through a colloid mill
Adding a defoaming agent, a spray drying auxiliary agent, a bactericide and a protective colloid into the latex liquid obtained in the RO reverse osmosis concentration process, then grinding and mixing in a colloid mill, discharging after a stable and uniform colloid is achieved, and obtaining a colloid concentrated solution.
The defoaming agent comprises the following components: the active component is high carbon aromatic alcohol, and the addition amount of the defoaming agent is 5 per mill of the mass of the emulsion;
the spray drying auxiliary agent is glutaraldehyde modified polyvinyl alcohol, and the addition amount of the spray drying auxiliary agent is 2 per mill of the mass of the emulsion;
the bactericide is a benzimidazole bactericide, and the addition amount of the bactericide is 2 per mill of the mass of the emulsion;
the protective colloid is xanthan gum graft modified polyvinyl alcohol, and the addition amount of the protective colloid is 5% of the mass of the emulsion.
Step 6, spray drying
Drying the colloid concentrated solution by spray drying equipment, setting the inlet temperature of the spray drying equipment at 120 ℃, the outlet temperature at 60 ℃ and the rotation speed of an atomizer at 21000rpm, and drying to obtain the rubber powder.
Adding an anti-caking agent into the rubber powder obtained by spray drying, wherein the adding amount is 7 percent of the mass of the rubber powder, and uniformly mixing; and obtaining the redispersible latex powder.
The anti-caking agent is fluorine-silicon modified kaolin. The fluorine-silicon modified kaolin: the kaolin particles are coated with fluorine-silicon copolymer resin, and the mass ratio of the kaolin to the fluorine-silicon copolymer resin is 40: 1.
The product prepared in this embodiment includes the filler powder obtained in step 3 and the redispersible latex powder obtained in step 6; the filler powder and the redispersible latex powder are detected, and the detection results are recorded as shown in tables 3-4:
TABLE 3 Filler powder Performance index test results
Figure 849447DEST_PATH_IMAGE003
TABLE 4 Performance test results of redispersible latex powder
Figure 572552DEST_PATH_IMAGE004
As can be seen from tables 3 to 4, the filler powders prepared in this example: the appearance is white, no caking exists, the mesh number is 800 meshes, the moisture content is 0.4 percent, the loss on ignition is 5.3 percent, and the oil absorption is 2.9g/100 g. The redispersible latex powder prepared in this example: white powder in appearance, particle size: the content of particles with the particle diameter of more than 400um is 3.6 percent; the residue of the ignition residue was 12%, the bulk density was 485g/L, and the nonvolatile content reached 98.4%.
Example 3 Water-based waterproof coating wastewater treatment technology
Take the wastewater treatment in the production process of the waterproof coating film used under the ceramic tile bonding layer as an example:
a water-based waterproof coating wastewater treatment process comprises the following steps:
step 1, plate and frame filter pressing
And (3) introducing the water-based waterproof coating wastewater into a plate-and-frame filter press for filtering treatment, and controlling the plate-and-frame pressure to be 0.16MPa to obtain a concentrated solution A and wastewater A. The water-based waterproof coating wastewater: is used for the waste water generated in the production process of the waterproof coating film under the ceramic tile bonding layer.
The plate-and-frame filter press comprises: the filter cloth with the aperture of 30 microns is adopted, the filter cloth is made of polyacrylonitrile fiber with the surface coated with silicon nitride, and the coating thickness of the silicon nitride is 5 microns. The filter cloth can effectively intercept granular pigment and filler in the filter pressing process.
Step 2, ceramic membrane filtration
And (3) introducing the wastewater A subjected to the plate-and-frame filter pressing process into a ceramic membrane device for microfiltration, controlling the inlet pressure to be 4.0bar, the outlet pressure to be 1.4bar and the compression multiple of microfiltration to be 20 times, and performing microfiltration to obtain a concentrated solution B and wastewater B.
The ceramic membrane device is provided with 4 groups of membrane stacks, the four groups of membrane stacks are completely the same, the aperture of the adopted ceramic membrane is 50nm, and the ceramic membrane mold core is a silicon carbide ceramic tube type ceramic membrane; wherein 3 membrane piles are working membrane piles, 1 membrane pile is the washing membrane pile, and when leading-in ceramic membrane device of waste water A carries out the micro-filtration, waste water flows through 3 working membrane piles in proper order.
This procedure removes the remaining impurities other than the latex particles and the trace of the adjuvant molecules.
Step 3, drying the powder
Mixing concentrated solution A and concentrated solution B obtained by plate-and-frame filter pressing and ceramic membrane filtration, and drying the mixed solid by a fluidized bed, wherein the air inlet temperature of the fluidized bed is 140 ℃ and the air outlet temperature of the fluidized bed is 65 ℃; crushing the dried solid by grinding equipment; and (3) sieving the crushed solid to obtain filler powder, wherein the power of a vibration motor is 4.5kw, and the aperture of the vibration sieve is 650 meshes.
Step 4, RO reverse osmosis concentration
Introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration, including primary reverse osmosis and secondary reverse osmosis; wherein: in the first-stage reverse osmosis, the membrane inlet pressure is 3.2MPa, the concentration ratio is 56 percent, and the solid content is controlled to be 52 percent. In the secondary reverse osmosis, the membrane inlet pressure is 2.9MPa, the concentration ratio is 86 percent, and the solid content is controlled to be 50 percent. The wastewater is concentrated by reverse osmosis to obtain pure deionized water and latex liquid (namely emulsion).
RO reverse osmosis concentrated system, adopt board-like reverse osmosis membrane, the membrane core material is by modified polyamide, carbon nanotube grafting polyvinylidene fluoride (PVDF) and carbon fiber according to 4: 4: 2, and mixing the components in a mass ratio.
The pure deionized water can be returned to the production process of the water-based waterproof coating for recycling. And (3) carrying out water quality detection on the deionized water, wherein the detection result is as follows: turbidity was 0 NTU, pH 7.5 and conductivity 4.6 us/cm.
Step 5, passing through a colloid mill
Adding a defoaming agent, a spray drying auxiliary agent, a bactericide and a protective colloid into the latex liquid obtained in the RO reverse osmosis concentration process, then grinding and mixing in a colloid mill, discharging after a stable and uniform colloid is achieved, and obtaining a colloid concentrated solution.
The defoaming agent comprises the following components: the active component is high carbon aromatic alcohol, and the addition amount of the defoaming agent is 5 per mill of the mass of the emulsion;
the spray drying auxiliary agent is glutaraldehyde modified polyvinyl alcohol, and the addition amount of the spray drying auxiliary agent is 2 per mill of the mass of the emulsion;
the bactericide is an isothiazolinone bactericide, and the addition amount of the bactericide is 2 per mill of the mass of the emulsion;
the protective colloid is xanthan gum graft modified polyvinyl alcohol, and the addition amount of the protective colloid is 5% of the mass of the emulsion.
Step 6, spray drying
Drying the colloid concentrated solution by spray drying equipment, setting the inlet temperature of the spray drying equipment at 130 ℃, the outlet temperature at 70 ℃ and the rotation speed of an atomizer at 21000rpm, and drying to obtain the rubber powder.
Adding an anti-caking agent into the rubber powder obtained by spray drying, wherein the adding amount is 8 percent of the mass of the rubber powder, and uniformly mixing; and obtaining the redispersible latex powder.
The anti-caking agent is fluorine-silicon modified kaolin. The fluorine-silicon modified kaolin: the kaolin particles are coated with fluorine-silicon copolymer resin, and the mass ratio of the kaolin to the fluorine-silicon copolymer resin is 40: 1.
The product prepared in this embodiment includes the filler powder obtained in step 3 and the redispersible latex powder obtained in step 6; the filler powder and the redispersible latex powder are detected, and the detection results are recorded as shown in tables 5-6:
TABLE 5 Filler powder Performance index test results
Figure 199974DEST_PATH_IMAGE005
TABLE 6 detection results of redispersible latex powder properties
Figure 163381DEST_PATH_IMAGE006
As can be seen from tables 5 to 6, the filler powders prepared in this example: the appearance is white, no caking exists, the mesh number is 700 meshes, the moisture content is 0.35 percent, the loss on ignition is 5.6 percent, and the oil absorption is 2.8g/100 g. The redispersible latex powder prepared in this example: white powder in appearance, particle size: the content of particles with the particle diameter of more than 400um is 3.5 percent; the residue on ignition was 12.3%, the bulk density was 476g/L, and the nonvolatile content was 98.3%.
Except for special description, the percentages are mass percentages, and the ratios are mass ratios.
The water-based waterproof coating wastewater treatment process has the obvious advantages of simple process, low equipment investment, utilization of hundreds of wastes, real realization of zero discharge, excellent performance of the obtained product and the like. It is clear that many variants are possible within the inventive idea, and that any changes made within the inventive idea shall be deemed to fall within the scope of protection of the invention.

Claims (10)

1. A water-based waterproof coating wastewater treatment process is characterized in that: the method comprises the steps of plate-and-frame filter pressing, ceramic membrane filtration, powder drying, RO reverse osmosis concentration, colloid mill passing and spray drying; and (3) plate and frame filter pressing: introducing the water-based waterproof coating wastewater into a plate-and-frame filter press for filtering treatment to obtain a concentrated solution A and wastewater A; and (3) filtering by using a ceramic membrane: introducing the wastewater A subjected to the plate-and-frame filter pressing process into a ceramic membrane device for microfiltration, and performing microfiltration to obtain a concentrated solution B and wastewater B; and (3) RO reverse osmosis concentration: and (3) introducing the wastewater B obtained after the ceramic membrane filtration into an RO reverse osmosis concentration system for two-stage reverse osmosis concentration to obtain pure deionized water and emulsion.
2. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: the plate-and-frame filter press comprises: the filter cloth with the aperture of 30-50 microns is adopted and is made of polyacrylonitrile fiber with the surface coated with silicon nitride.
3. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: and (3) microfiltration: controlling the inlet pressure to be 3.5-4.0bar, the outlet pressure to be 1.0-1.4bar, and the compression multiple of the microfiltration to be 15-20 times.
4. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: and (3) drying the powder: mixing concentrated solution A and concentrated solution B obtained by plate-and-frame filter pressing and ceramic membrane filtration, drying the mixed solid by a fluidized bed, and crushing the dried solid by grinding equipment; and (4) sieving the crushed solid by a vibrating sieve to obtain the filler powder.
5. The water-based waterproof coating wastewater treatment process according to claim 4, characterized in that: drying in a fluidized bed: the air inlet temperature of the fluidized bed is 120-140 ℃, and the air outlet temperature is 50-65 ℃.
6. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: the two-stage reverse osmosis concentration: comprises primary reverse osmosis and secondary reverse osmosis; the first-stage reverse osmosis has the membrane inlet pressure of less than or equal to 3.5MPa, the concentration ratio of more than 55 percent and the solid content of 50-55 percent; the two-stage reverse osmosis has the membrane inlet pressure of less than or equal to 3.0MPa, the concentration ratio of more than 85 percent and the solid content of 48 to 52 percent.
7. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: the RO reverse osmosis concentration system adopts a plate-type reverse osmosis membrane, and the membrane core is made of modified polyamide, carbon nanotube grafted polyvinylidene fluoride and carbon fiber according to the weight ratio of 3-5: 3-5: 1.5-2.5, and processing after mixing.
8. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: the colloid mill passing: adding a defoaming agent, a spray drying auxiliary agent, a bactericide and a protective colloid into the emulsion obtained in the RO reverse osmosis concentration process, and then grinding and mixing the emulsion in a colloid mill to obtain a colloid concentrated solution.
9. The water-based waterproof coating wastewater treatment process according to claim 8, characterized in that: the defoaming agent comprises the following components: the active component is high carbon aromatic alcohol, and the addition amount of the defoaming agent is 4.5-5.5 per mill of the mass of the emulsion; the spray drying auxiliary agent is glutaraldehyde modified polyvinyl alcohol, and the addition amount of the spray drying auxiliary agent is 1.8-2.2 per mill of the mass of the emulsion; the bactericide is a benzimidazole bactericide or an isothiazolinone bactericide, and the addition amount of the bactericide is 1.8-2.4 per mill of the mass of the emulsion; the protective colloid is guar gum grafted modified polyvinyl alcohol or xanthan gum grafted modified polyvinyl alcohol or a mixture of the guar gum grafted modified polyvinyl alcohol and the xanthan gum grafted modified polyvinyl alcohol, and the addition amount of the protective colloid is 4.5-5.5% of the mass of the emulsion.
10. The water-based waterproof coating wastewater treatment process according to claim 1, characterized in that: the spray drying comprises the following steps: drying the colloid concentrated solution by spray drying equipment to obtain rubber powder; adding an anti-caking agent into the rubber powder obtained by spray drying, and uniformly mixing; obtaining re-dispersible latex powder; the anti-caking agent is any one of kaolin, modified kaolin, diatomite and calcium carbonate.
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