CN113480047A - Treatment method and treatment system for resin regeneration high-salinity wastewater - Google Patents
Treatment method and treatment system for resin regeneration high-salinity wastewater Download PDFInfo
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- 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
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- 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
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- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
Abstract
The invention belongs to the technical field of wastewater treatment, and provides a treatment method and a treatment system for resin regeneration high-salinity wastewater. In the invention, the resin regeneration high-salinity wastewater is quenched and tempered to obtain stable resin regeneration high-salinity wastewater; mixing the stable resin regenerated high-salinity wastewater with a flocculating agent, and then filtering with a multi-medium to obtain a filtered clear solution; carrying out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution is refluxed for tempering and circulation; carrying out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated liquid and sodium chloride; recycling the sodium chloride; and (4) refluxing the nanofiltration concentrated solution, tempering and circulating. The flocculant can precipitate large-particle organic matters; the multi-medium filtration can remove suspended matters, the ultrafiltration can remove large-particle colloids and suspended matters, and the nanofiltration can remove chroma and multivalent ions. The data of the embodiment shows that the method provided by the invention has high recovery rate of salt in the resin regeneration high-salinity wastewater and high COD removal rate.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment method and a treatment system for resin regeneration high-salinity wastewater.
Background
The sugar liquor is decolorized by ion exchange, and the waste liquid regenerated after the resin is saturated is also called resin regeneration high-salt wastewater, contains a large amount of pigments and organic matters, and is dark in color. The existing treatment methods for resin regeneration high-salinity wastewater generally comprise a lime milk (the concentration of calcium oxide in the lime milk is 100g/L) precipitation method and a Fenton (Fenton) advanced oxidation method. The Fenton advanced oxidation method degrades COD in the resin regeneration high-salinity wastewater by adding ferrous sulfate and hydrogen peroxide. The Fenton advanced oxidation method needs a large amount of medicament to be added, has high operation cost, and can not effectively treat the salt in the resin regeneration high-salinity wastewater.
The lime milk precipitation method can be used for regenerating large-particle organic matters in high-salinity wastewater by partially precipitating resin through adding medicines, and small-molecule organic matters are required to be treated by other treatment modes, and the mode can also generate a large amount of solid waste due to the fact that salt does not have treatment effect.
Therefore, it is necessary to develop and research a method for treating resin regeneration high-salinity wastewater with high organic matter treatment efficiency.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a system for treating high salinity wastewater generated by resin regeneration. The treatment method provided by the invention can be used for efficiently removing salt and organic matters.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a treatment method of resin regeneration high-salinity wastewater, which comprises the following steps:
hardening and tempering the resin regeneration high-salinity wastewater to obtain stable resin regeneration high-salinity wastewater;
mixing the stable resin regenerated high-salinity wastewater with a flocculating agent, and then filtering with a multi-medium to obtain a filtered clear solution;
carrying out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution is refluxed, tempered and circulated;
carrying out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated liquid and sodium chloride; recycling the sodium chloride;
the addition amount of the flocculating agent is 3-5 ppm.
Preferably, the conditioning mode is standing.
Preferably, the flocculant comprises polyacrylamide.
Preferably, the operating pressure of the multi-medium filtration is 0.3-0.5 MPa; the multi-medium filtering medium comprises a first quartz sand layer, a second quartz sand layer and a smokeless coal layer which are sequentially stacked and paved; the thickness of the first quartz sand layer is 400mm, and the particle size of quartz sand in the first quartz sand layer is 1-2 mm; the thickness of the second quartz sand layer is 400mm, and the particle size of quartz sand in the second quartz sand layer is 2-4 mm; the thickness of the smokeless coal bed is 400 mm; the particle size of anthracite in the smokeless coal bed is 4-6 mm; the smokeless coal seam is a bottom layer.
Preferably, the ultrafiltration membrane is made of polyether sulfone; the aperture of the ultrafiltration membrane is 0.01-0.03 mu m.
Preferably, the operating pressure of the ultrafiltration is 0.4-0.7 MPa.
Preferably, the nanofiltration membrane is made of polyether sulfone, and the aperture of the nanofiltration membrane is preferably 1-3 nm.
Preferably, the operating pressure of the nanofiltration is 1.2-1.8 MPa.
The invention also provides a system for treating the resin regeneration high-salinity wastewater, which comprises a water tank 1;
the first booster pump 2 is communicated with the water outlet of the water tank 1;
a multimedia filter 3 communicating with an outlet of the first booster pump 2;
an ultrafiltration device 4 in communication with the outlet of the multimedia filter 3;
an intermediate storage water tank 5 communicated with a clear liquid outlet of the ultrafiltration device 4;
a second booster pump 6 communicated with an outlet of the intermediate storage water tank 5;
a nanofiltration device 7 communicated with an outlet of the second booster pump 6;
a nanofiltration concentrated solution outlet of the ultrafiltration device 7 is communicated with the water tank 1;
a doser 8 is arranged on a pipeline communicated with the first booster pump 2 and the multi-medium filter 3;
and a concentrated solution outlet of the ultrafiltration device 4 is communicated with the water tank 1.
The invention provides a treatment method of resin regeneration high-salinity wastewater, which comprises the following steps: hardening and tempering the resin regeneration high-salinity wastewater to obtain stable resin regeneration high-salinity wastewater; mixing the stable resin regenerated high-salinity wastewater with a flocculating agent, and then filtering with a multi-medium to obtain a filtered clear solution; carrying out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution is refluxed for tempering and circulation; carrying out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated liquid and sodium chloride; recycling the sodium chloride; and (4) refluxing the nanofiltration concentrated solution, tempering and circulating. According to the invention, a flocculating agent is added to precipitate large-particle organic matters in the resin regeneration high-salinity wastewater; the multi-medium filtration can remove suspended matters, the ultrafiltration can remove large-particle colloids and suspended matters, and the nanofiltration can remove chroma and multivalent ions.
According to the data of the embodiment, the treatment method provided by the invention has high recovery rate of salt in the resin regeneration high-salinity wastewater and high COD removal rate.
The invention also provides a treatment system for the resin regeneration high-salinity wastewater, which is few in equipment, small in occupied area and suitable for industrial application.
Drawings
Fig. 1 is a treatment system of resin regeneration high-salinity wastewater provided by the invention, wherein 1 is a water tank, 2 is a first booster pump, 3 is a multi-medium filter, 4 is an ultrafiltration device, 5 is an intermediate storage water tank, 6 is a second booster pump, 7 is a nanofiltration device, and 8 is a doser.
Detailed Description
The invention provides a treatment method of resin regeneration high-salinity wastewater, which comprises the following steps:
hardening and tempering the resin regeneration high-salinity wastewater to obtain stable resin regeneration high-salinity wastewater;
mixing the stable resin regenerated high-salinity wastewater with a flocculating agent, and then filtering with a multi-medium to obtain a filtered clear solution;
carrying out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution is refluxed for tempering and circulation;
carrying out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated liquid and sodium chloride; recycling the sodium chloride; and (4) refluxing the nanofiltration concentrated solution, tempering and circulating.
In the present invention, the starting materials used in the present invention are preferably commercially available products unless otherwise specified.
According to the invention, the resin regeneration high-salinity wastewater is quenched and tempered to obtain the stable resin regeneration high-salinity wastewater. In the invention, the preparation method is preferably static, and the static time is preferably 2-3 h. The source of the resin regeneration high-salinity wastewater is not particularly limited, and the resin regeneration high-salinity wastewater obtained by the technical personnel in the field can be adopted. In the specific embodiment of the invention, the resin regeneration high-salinity wastewater has COD of 5000mg/L and salt content of 10 wt%.
In the invention, the function of tempering is to balance the components of the feed liquid and ensure the long-term stability of the system.
After the stable resin regeneration high-salinity wastewater is obtained, the stable resin regeneration high-salinity wastewater is mixed with a flocculating agent and then is subjected to multi-medium filtration to obtain a filtered clear solution.
In the invention, the addition amount of the flocculating agent is 3-5 ppm, preferably 4 ppm; the flocculant is preferably polyacrylamide. In the invention, the multi-medium filtering medium preferably comprises a first quartz sand layer, a second quartz sand layer and a smokeless coal layer which are sequentially stacked; the thickness of the first quartz sand layer is 400mm, and the particle size of quartz sand in the first quartz sand layer is 1-2 mm; the thickness of the second quartz sand layer is 400mm, and the particle size of quartz sand in the second quartz sand layer is 2-4 mm; the thickness of the smokeless coal bed is 400 mm; the particle size of anthracite in the smokeless coal bed is 4-6 mm; the smokeless coal seam is a bottom layer. In the invention, the operating pressure of the multi-media filtration is preferably 0.3-0.5 MPa, and more preferably 0.35-0.4 MPa.
In the invention, the addition of the flocculating agent can accelerate the flocculation of suspended matters; the multi-media filtration is capable of removing large particulate matter with turbidity less than 1.
After obtaining the filtered clear liquid, the invention carries out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid.
In the invention, the ultrafiltration membrane is preferably made of polyether sulfone; the aperture of the ultrafiltration membrane is preferably 0.01-0.03 mu m. In the invention, the operating pressure of the ultrafiltration is preferably 0.4-0.7 MPa, and more preferably 0.6 MPa.
In the invention, the ultrafiltration concentrated solution is refluxed, tempered and circulated.
In the present invention, the ultrafiltration can remove part of the pigments and colloidal substances.
After the ultrafiltration clear liquid is obtained, the invention carries out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated solution and sodium chloride.
In the invention, the nanofiltration membrane is preferably made of polyether sulfone; the aperture of the nanofiltration membrane is preferably 1-3 nm. In the invention, the operating pressure of nanofiltration is preferably 1.2-1.8 MPa, and more preferably 1.6 MPa.
In the invention, the sodium chloride is recycled; and (4) refluxing the nanofiltration concentrated solution for conditioning and circulating.
In the invention, the nanofiltration membrane can intercept divalent ions and COD, and the rejection rate of monovalent ions is very low; nanofiltration is able to remove 99% of pigments and multivalent ions.
The invention also provides a system for treating the resin regeneration high-salinity wastewater, which comprises a water tank 1; a first booster pump 2 communicated with an outlet of the water tank 1;
a multimedia filter 3 communicating with an outlet of the first booster pump 2;
an ultrafiltration device 4 in communication with the outlet of the multimedia filter 3;
an intermediate storage water tank 5 communicated with a clear liquid outlet of the ultrafiltration device 4;
a second booster pump 6 communicated with an outlet of the intermediate storage water tank 5;
a nanofiltration device 7 communicated with an outlet of the second booster pump 6;
a nanofiltration concentrated solution outlet of the ultrafiltration device 7 is communicated with the water tank 1;
a doser 8 is arranged on a pipeline communicated with the first booster pump 2 and the multi-medium filter 3;
and a concentrated solution outlet of the ultrafiltration device 4 is communicated with the water tank 1.
The system for treating resin regeneration high-salinity wastewater is described in detail below with reference to fig. 1.
The treatment system of resin regeneration high salt waste water that the invention provides comprises a water tank 1; the water tank 1 comprises a water outlet and a water inlet; the water inlet is used for the entering of resin regeneration high salt waste water.
The treatment system of resin regeneration high salt waste water provided by the invention comprises a first booster pump 2; the first booster pump 2 comprises an inlet and an outlet; and the inlet of the first booster pump 2 is communicated with the water outlet of the water tank 1.
The treatment system for resin regeneration high-salinity wastewater provided by the invention comprises a multi-media filter 3; the multi-media filter 3 comprises a water inlet and a filtered clear liquid outlet; and the water inlet of the multi-medium filter 3 is communicated with the outlet of the first booster pump 2. In the invention, the filter of the multi-media filter 3 comprises a smokeless coal layer, a second quartz sand layer and a first quartz sand layer which are arranged in a stacked mode; the smokeless coal seam is a bottom layer; the parameters of the second quartz sand layer and the first quartz sand layer are preferably consistent with the technical scheme, and are not described again.
The treatment system for resin regeneration high-salinity wastewater provided by the invention also comprises a doser 8; the doser 8 is arranged on a pipeline communicated with the first booster pump 2 and the multi-medium filter 3.
The treatment system of resin regeneration high salt waste water provided by the invention comprises an ultrafiltration device 4; the ultrafiltration device 4 comprises a water inlet, an ultrafiltration concentrated solution outlet and an ultrafiltration clear solution outlet; the water inlet of the ultrafiltration device 4 is communicated with the filtered clear liquid outlet of the multi-media filter 3. In the present invention, the ultrafiltration membrane is preferably polyethersulfone; the pore diameter of the ultrafiltration membrane is preferably 0.01. mu.m. In the invention, an ultrafiltration concentrated solution outlet of the ultrafiltration device 4 is communicated with the water tank 1.
The treatment system of resin regeneration high salinity wastewater provided by the invention comprises an intermediate water storage tank 5; the middle water storage tank 5 comprises a water inlet and a water outlet, and the water inlet of the middle water storage tank 5 is communicated with the ultrafiltration clear liquid outlet of the ultrafiltration device 4.
The treatment system for resin regeneration high-salinity wastewater provided by the invention comprises a second booster pump 6; and the second booster pump 6 comprises a water inlet and a water outlet, and the water inlet of the second booster pump 6 is communicated with the water outlet of the middle water storage tank 5.
The treatment system for the resin regeneration high-salinity wastewater comprises a nanofiltration device 7, wherein the nanofiltration device 7 comprises a water inlet and a nanofiltration concentrated solution outlet; a water inlet of the nanofiltration device 7 is communicated with a water outlet of the second booster pump 6; and a nanofiltration concentrated solution outlet of the ultrafiltration device 7 is communicated with the water tank 1.
The method for treating the resin regeneration high-salinity wastewater is described below by combining the system schematic diagram described in figure 1.
Placing the resin regeneration high-salinity wastewater into a water tank 1 for modulation to obtain stable resin regeneration high-salinity wastewater;
mixing the high-salinity wastewater regenerated by the stable resin and a flocculating agent introduced by a doser 8 in a pipeline through a first booster pump 2, and entering a multi-media filter 3 for multi-media filtration to obtain a filtered clear solution;
the filtered clear liquid enters an ultrafiltration device 4 for ultrafiltration to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution flows back to the water tank 1 for modulation and circulation;
after the ultrafiltration clear liquid flows into an intermediate water storage tank 5 for stabilization, the ultrafiltration clear liquid enters a nanofiltration device 7 through a second booster pump 6 to obtain sodium chloride and nanofiltration concentrated liquid; and the nanofiltration concentrated solution flows back to the water tank 1 for conditioning and circulation.
The method and system for treating high-salinity wastewater from resin regeneration provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The system setting is carried out according to the resin regeneration high-salinity wastewater treatment system shown in the figure 1, and the specific method comprises the following steps:
putting the resin regeneration high-salinity wastewater (wherein the COD content is 5000mg/L, the salt content is 10 wt%, and 99% of salt is sodium chloride) into a water tank for blending for 3 hours to obtain stable resin regeneration high-salinity wastewater;
mixing the high-salinity wastewater regenerated by the stable resin and a flocculating agent (polyacrylamide with the addition amount of 3ppm) introduced by a chemical feeder in a pipeline through a first booster pump, and enabling the mixture to enter a multi-media filter (the filler of the multi-media filter comprises a 4-6 mm smokeless coal bed (the thickness is 400mm), a 2-4 mm quartz sand layer (the thickness is 400mm) and a 1-2 mm quartz sand layer (the thickness is 400mm) which are sequentially laid in a stacking manner to perform multi-media filtration, wherein the smokeless coal bed is a bottom layer, and the operating pressure of the multi-media filtration is 0.35MPa, so that a filtered clear solution is obtained;
the filtered clear liquid enters an ultrafiltration device (the ultrafiltration membrane is made of polyether sulfone, and the aperture of the ultrafiltration membrane is 0.01 mu m) for ultrafiltration, and the operating pressure of ultrafiltration is 0.4MPa, so that ultrafiltration concentrated liquid and ultrafiltration clear liquid are obtained; the ultrafiltration concentrated solution flows back to the water tank 1 for modulation and circulation;
after the ultrafiltration clear liquid flows into an intermediate water storage tank for stabilization, the ultrafiltration clear liquid enters a nanofiltration device (the nanofiltration membrane is made of polyether sulfone, the aperture of the nanofiltration membrane is 1nm) through a second booster pump for nanofiltration, and the operating pressure of the nanofiltration is 1.6MPa, so that a sodium chloride solution and a nanofiltration concentrated liquid are obtained; and the nanofiltration concentrated solution flows back to the water tank for conditioning and circulation.
Determining the mass percentage content of sodium chloride in the obtained sodium chloride solution to be 9.85 percent; recrystallizing the obtained sodium chloride solution to obtain sodium chloride solid; the purity of the obtained sodium chloride solid was 99% as measured by potentiometric titration.
The content of COD in the nanofiltration concentrated solution is 25000 mg/L.
Example 2
The system setting is carried out according to the resin regeneration high-salinity wastewater treatment system shown in the figure 1, and the specific method comprises the following steps:
putting the resin regeneration high-salinity wastewater (the COD content is 5000mg/L and the salinity content is 10 wt%) into a water tank for blending for 2 hours to obtain stable resin regeneration high-salinity wastewater;
mixing the high-salinity wastewater regenerated by the stable resin and a flocculating agent (polyacrylamide with the addition amount of 3ppm) introduced by a chemical feeder in a pipeline through a first booster pump, and enabling the mixture to enter a multi-media filter (the filler of the multi-media filter comprises a 4-6 mm smokeless coal bed (the thickness is 400mm), a 2-4 mm quartz sand layer (the thickness is 400mm) and a 1-2 mm quartz sand layer (the thickness is 400mm) which are sequentially stacked for multi-media filtration, wherein the smokeless coal bed is a bottom layer, and the operating pressure of the multi-media filtration is 0.5MPa, so as to obtain a filtered clear solution;
the filtered clear liquid enters an ultrafiltration device (the ultrafiltration membrane is made of polyether sulfone, and the aperture of the ultrafiltration membrane is 0.03 mu m) for ultrafiltration, and the operating pressure of ultrafiltration is 0.4MPa, so that ultrafiltration concentrated liquid and ultrafiltration clear liquid are obtained; the ultrafiltration concentrated solution flows back to the water tank 1 for modulation and circulation;
after the ultrafiltration clear liquid flows into an intermediate water storage tank for stabilization, the ultrafiltration clear liquid enters a nanofiltration device (the nanofiltration membrane is made of polyether sulfone, the aperture of the nanofiltration membrane is 1nm) through a second booster pump for nanofiltration, and the operating pressure of the nanofiltration is 1.6MPa, so that a sodium chloride solution and a nanofiltration concentrated liquid are obtained; and the nanofiltration concentrated solution flows back to the water tank for conditioning and circulating.
Measuring to obtain 9.8 percent of sodium chloride in the sodium chloride solution; recrystallizing the obtained sodium chloride solution to obtain sodium chloride solid; the purity of the obtained sodium chloride solid was 98% as measured by potentiometric titration.
The content of COD in the nanofiltration concentrated solution is 2450 mg/L.
Example 3
The system setting is carried out according to the resin regeneration high-salinity wastewater treatment system shown in the figure 1, and the specific method comprises the following steps:
putting the resin regeneration high-salinity wastewater (the COD content is 5000mg/L and the salinity content is 10 wt%) into a water tank for blending for 3 hours to obtain stable resin regeneration high-salinity wastewater;
mixing the high-salinity wastewater regenerated by the stable resin and a flocculating agent (polyacrylamide with the addition amount of 3ppm) introduced by a doser in a pipeline through a first booster pump, and enabling the mixture to enter a multi-media filter (the filler of the multi-media filter comprises a 4-6 mm smokeless coal bed (the thickness is 400mm), a 2-4 mm quartz sand layer (400mm) and a 1-2 mm quartz sand layer (the thickness is 400mm) which are sequentially stacked for multi-media filtration, wherein the smokeless coal bed is a bottom layer, and the operating pressure of the multi-media filtration is 0.35MPa, so that a filtered clear solution is obtained;
the filtered clear liquid enters an ultrafiltration device (the ultrafiltration membrane is made of polyether sulfone, the aperture of the ultrafiltration membrane is 0.01 mu m) for ultrafiltration, and the operating pressure of the ultrafiltration is 0.6MPa, so that ultrafiltration concentrated liquid and ultrafiltration clear liquid are obtained; the ultrafiltration concentrated solution flows back to the water tank 1 for modulation and circulation;
after the ultrafiltration clear liquid flows into an intermediate water storage tank for stabilization, the ultrafiltration clear liquid enters a nanofiltration device (the nanofiltration membrane is made of polyether sulfone, the aperture of the nanofiltration membrane is 1nm) through a second booster pump for nanofiltration, and the operating pressure of the nanofiltration is 1.2MPa, so that a sodium chloride solution and a nanofiltration concentrated liquid are obtained; and the nanofiltration concentrated solution flows back to the water tank for conditioning and circulating.
Determining the mass percentage content of sodium chloride in the obtained sodium chloride solution to be 9.95 percent; recrystallizing the obtained sodium chloride solution to obtain sodium chloride solid; the purity of the obtained sodium chloride solid was 99.5% as measured by potentiometric titration.
The content of COD in the nanofiltration concentrated solution is 26000 mg/L.
As can be seen from example 1, the treatment method provided by the invention is simple to operate, and has high recovery rate of salt in the resin regeneration high-salinity wastewater and high COD removal rate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A treatment method of resin regeneration high-salinity wastewater is characterized by comprising the following steps:
hardening and tempering the resin regeneration high-salinity wastewater to obtain stable resin regeneration high-salinity wastewater;
mixing the stable resin regenerated high-salinity wastewater with a flocculating agent, and then filtering with a multi-medium to obtain a filtered clear solution;
carrying out ultrafiltration on the filtered clear liquid to obtain ultrafiltration concentrated liquid and ultrafiltration clear liquid; the ultrafiltration concentrated solution is refluxed, tempered and circulated;
carrying out nanofiltration on the ultrafiltration clear liquid to obtain nanofiltration concentrated liquid and sodium chloride; recycling the sodium chloride;
the addition amount of the flocculating agent is 3-5 ppm.
2. The processing method according to claim 1, wherein the conditioning is static.
3. The process of claim 1, wherein the flocculant comprises polyacrylamide.
4. The treatment method according to claim 1, wherein the operating pressure of the multi-media filtration is 0.3-0.5 MPa; the multi-medium filtering medium comprises a first quartz sand layer, a second quartz sand layer and a smokeless coal layer which are sequentially stacked and paved; the thickness of the first quartz sand layer is 400mm, and the particle size of quartz sand in the first quartz sand layer is 1-2 mm; the thickness of the second quartz sand layer is 400mm, and the particle size of quartz sand in the second quartz sand layer is 2-4 mm; the thickness of the smokeless coal bed is 400 mm; the particle size of anthracite in the smokeless coal bed is 4-6 mm; the smokeless coal seam is a bottom layer.
5. The treatment method according to claim 1, wherein the ultrafiltration membrane is made of polyethersulfone; the aperture of the ultrafiltration membrane is 0.01-0.03 mu m.
6. The treatment process according to claim 1 or 5, wherein the operating pressure of the ultrafiltration is 0.4 to 0.7 MPa.
7. The treatment method according to claim 1, wherein the nanofiltration membrane is made of polyethersulfone, and the pore diameter of the nanofiltration membrane is preferably 1-3 nm.
8. The treatment method according to claim 1 or 7, wherein the operating pressure of the nanofiltration is 1.2 to 1.8 MPa.
9. A treatment system for resin regeneration high-salinity wastewater is characterized by comprising a water tank (1);
the first booster pump (2) is communicated with a water outlet of the water tank (1);
a multi-media filter (3) communicated with an outlet of the first booster pump (2);
an ultrafiltration device (4) in communication with the outlet of the multimedia filter (3);
an intermediate storage water tank (5) communicated with a clear liquid outlet of the ultrafiltration device (4);
a second booster pump (6) communicated with an outlet of the intermediate storage water tank (5);
a nanofiltration device (7) communicated with an outlet of the second booster pump (6);
a nanofiltration concentrated solution outlet of the ultrafiltration device (7) is communicated with the water tank (1);
a doser (8) is arranged on a pipeline communicated with the first booster pump (2) and the multi-medium filter (3);
and a concentrated solution outlet of the ultrafiltration device (4) is communicated with the water tank (1).
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