CN114684881A - Method for utilizing activated persulfate to reduce VOCs entering photo-thermal distillation condensation to desalinate water - Google Patents
Method for utilizing activated persulfate to reduce VOCs entering photo-thermal distillation condensation to desalinate water Download PDFInfo
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- CN114684881A CN114684881A CN202210270740.1A CN202210270740A CN114684881A CN 114684881 A CN114684881 A CN 114684881A CN 202210270740 A CN202210270740 A CN 202210270740A CN 114684881 A CN114684881 A CN 114684881A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000004821 distillation Methods 0.000 title claims abstract description 72
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical class S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 title claims abstract description 56
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009833 condensation Methods 0.000 title claims abstract description 11
- 230000005494 condensation Effects 0.000 title claims abstract description 11
- 239000013535 sea water Substances 0.000 claims abstract description 40
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- 239000011358 absorbing material Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000012774 insulation material Substances 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 42
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 19
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 19
- IWDCLRJOBJJRNH-UHFFFAOYSA-N p-cresol Chemical compound CC1=CC=C(O)C=C1 IWDCLRJOBJJRNH-UHFFFAOYSA-N 0.000 claims description 17
- -1 polyethylene Polymers 0.000 claims description 14
- 239000006229 carbon black Substances 0.000 claims description 13
- WXNZTHHGJRFXKQ-UHFFFAOYSA-N 4-chlorophenol Chemical compound OC1=CC=C(Cl)C=C1 WXNZTHHGJRFXKQ-UHFFFAOYSA-N 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 2
- 229940090668 parachlorophenol Drugs 0.000 claims 1
- 238000010612 desalination reaction Methods 0.000 abstract description 7
- 238000005286 illumination Methods 0.000 abstract description 6
- 238000010525 oxidative degradation reaction Methods 0.000 abstract description 2
- FHHJDRFHHWUPDG-UHFFFAOYSA-L peroxysulfate(2-) Chemical compound [O-]OS([O-])(=O)=O FHHJDRFHHWUPDG-UHFFFAOYSA-L 0.000 description 27
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000002957 persistent organic pollutant Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000460 chlorine Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000012452 mother liquor Substances 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
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- 239000007791 liquid phase Substances 0.000 description 2
- 150000004976 peroxydisulfates Chemical class 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005185 salting out Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
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- 238000003915 air pollution Methods 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention discloses a method for utilizing activated persulfate to reduce VOCs (volatile organic compounds) to enter photothermal distillation condensation desalination water, which comprises the steps of placing an integrated distillation assembly on seawater, adding 0.5-1mmol/LPDS or 0.1mmol/LPMS into the seawater, and then carrying out illumination distillation to desalinate the seawater, wherein the integrated distillation assembly comprises a photothermal conversion material, a water absorption material, a heat insulation material and a baffle; the baffle is fixed on the upper surface of the first heat-insulating material, through holes are formed in the baffle and the first heat-insulating material, the water absorbing material is fixed in the through holes, one end of the water absorbing material is flatly laid on the surface of the baffle, the other end of the water absorbing material extends out of the first heat-insulating material, the second heat-insulating material is wrapped and fixed on the periphery of the baffle and the first heat-insulating material, one end of the water absorbing material is fixed between the baffle and the second heat-insulating material, and the photothermal conversion material is fixed on the water absorbing material on the surface of the baffle. The invention greatly improves the oxidative degradation efficiency and reduces the VOCs entering the condensed desalted water.
Description
Technical Field
The invention belongs to the field of drinking water treatment, and particularly relates to a method for reducing Volatile Organic Compounds (VOCs) entering condensed desalinated water by utilizing multi-medium synchronous activation persulfate of high temperature-high salt-illumination-photo-thermal materials formed on the surface of a distillation assembly in a photo-thermal distillation seawater desalination process, so that the water quality of the chilled desalinated water is improved.
Background
Desalination of sea water is considered to be one of the most effective methods to solve global water resource shortages. The existing seawater desalination process adopts a membrane method (such as reverse osmosis) and a thermal method (such as multi-effect distillation and multi-stage flash evaporation) which are high in energy consumption, not only has high water production cost, but also can cause air pollution, and is not suitable for islands with short power supply. Researches on the theory and application of the photo-thermal distillation seawater desalination technology based on gas-liquid interface heating are made around 2014 at home and abroad, and the method is widely concerned due to the characteristics of high seawater evaporation rate, simple process flow, low energy consumption, low cost and the like, and is considered to be one of effective methods for solving the problem of island fresh water supply shortage.
At present, the research on the desalination of seawater by photothermal distillation mainly centers on the development of photothermal conversion efficiency, salt resistance effect, long-acting operation, quality control of desalinated water and the like. Generally speaking, the higher the gas-liquid interface temperature is, the more favorable the seawater evaporation is, the higher the yield of the desalinated water is, but the more easily organic pollutants in the seawater, especially VOCs, are volatilized and escape and are condensed into the desalinated water, so that the risk of water quality safety is caused. Therefore, there is a need to cut VOCs into condensed desalinated water by related art means.
Disclosure of Invention
Aiming at the technical problems in the prior art, the application provides a method for utilizing activated persulfate to reduce VOCs (volatile organic compounds) to enter photothermal distillation condensation to desalinate water.
In a first aspect, the present application provides an integrated distillation assembly comprising a light-to-heat conversion material, a water absorbent material, a thermal insulation material, and a baffle; the baffle is fixed on the upper surface of the first heat-insulating material, through holes are formed in the baffle and the first heat-insulating material, the water absorbing material is fixed in the through holes, one end of the water absorbing material is flatly laid on the surface of the baffle, the other end of the water absorbing material extends out of the first heat-insulating material, the second heat-insulating material is wrapped and fixed on the periphery of the baffle and the first heat-insulating material, one end of the water absorbing material is fixed between the baffle and the second heat-insulating material, and the photothermal conversion material is fixed on the water absorbing material on the surface of the baffle.
As a further improvement scheme, the photothermal conversion material is obtained by loading carbon black on dust-free cloth; the water absorbing material is dust-free paper.
As a further improvement scheme, the heat insulation material adopts polyethylene foam EPE and polytetrafluoroethylene PTFE.
As a further improvement, the baffle adopts a polytetrafluoroethylene plate.
In a second aspect, the present application provides a distillation apparatus comprising an integrated distillation assembly as described above.
In a third aspect, the application provides a method for desalinating water by reducing VOCs (volatile organic compounds) by using activated persulfate and entering photothermal distillation condensation, which is characterized in that: the integrated distillation assembly is placed on seawater, 0.5-1mmol/LPDS or 0.1mmol/LPMS is added into the seawater, and then illumination distillation is carried out to desalt the seawater.
Finally, the application also provides an application of reducing VOCs in seawater into photothermal distillation condensation desalinated water by using the activated PDS or PMS.
As a further improvement scheme, the dosage of PDS is 1mmol/L, and the PMS content is 0.1 mmol/L.
As a further improvement scheme, the VOCs are phenol, p-cresol and p-chlorophenol.
The present application is described in further detail below:
the invention ensures higher evaporation rate and salt resistance by assembling the integrated distillation component polyethylene foam/polytetrafluoroethylene plate/dust-free paper/dust-free cloth/carbon black (EPE/PTFE/ALP/ALC/CB), and fully utilizes the light, heat and light-heat conversion materials on the surface of the distillation component and 4 mediums of chloride ions in seawater to synchronously activate the Peroxymonosulfate (PMS) and the Peroxydisulfate (PDS) to reduce VOCs (volatile organic chemicals) to enter condensed desalted water.
Carbon Black (CB) loaded by dust-free cloth (ALC) is used as a photothermal conversion material (ALC/CB), dust-free paper (ALP) is used as a water absorbing material, polyethylene foam (EPE) and a polytetrafluoroethylene Plate (PTFE) are used as heat insulating materials, the polytetrafluoroethylene Plate (PTFE) is used as a baffle plate to place the materials to prevent the materials from being oxidized by persulfate, and an integrated distillation assembly EPE/PTFE/ALP/ALC/CB is assembled. Placing the assembly in artificial simulated seawater, adding persulfate (PDS or PMS) into the artificial seawater, conveying the seawater and persulfate to the position below a photothermal conversion material ALC/CB by using dust-free paper ALP, and distilling the light, heat and photothermal material formed on the surface of EPE/PTFE/ALP/ALC/CB in seawater desalination by using photothermal distillation and Cl in seawater-And synchronously activating persulfate by 4 media to reduce Volatile Organic Compounds (VOCs) to enter the condensed desalted water.
The principle that the persulfate and the distillation assembly are adopted to reduce the VOCs is that light, heat and carbon-based materials and chloride ions in seawater can activate the persulfate, and the light, heat and light and heat materials formed by photo-thermal distillation are fully utilized to synchronously activate the Persulfate (PS) to reduce volatile phenol to enter condensed desalted water. The surface temperature of a distillation component in the interface solar distillation process reaches (40-70 ℃), and the PS can be activated by utilizing the formed heat; the illumination intensity of the surface is 1000w/m2, and PS can be activated by UV in sunlight; photothermal materials such as carbon-based materials, black oxides, etc. may also activate PS; in addition, chloride ions in seawater have also been shown to promote the degradation of organic materials by persulfate systems.
Compared with the prior art, the invention has the beneficial effects that:
(1) no report is found yet for reducing the VOCs in seawater into photothermal distillation condensation desalted water by adopting a persulfate activation method.
(2) In the photo-thermal distillation process, 4 media of illumination, high temperature and photo-thermal conversion materials formed on the surface of the distillation assembly and chloride ions in seawater are synchronously activated persulfate, so that the oxidative degradation efficiency is greatly improved, and VOCs are reduced to enter condensed desalted water.
(3) Compared with PDS, the amount of PMS added is less when the effect of reducing VOCs entering condensed desalted water is the same, and halogenated byproducts formed in the condensed desalted water are less, so that the application potential is greater.
Drawings
FIG. 1 is a schematic diagram of the concentration of phenol in the desalinated condensed water obtained by adding monosulfate to degrade phenol, (a: the concentration of a phenol mother liquor; b: the concentration of phenol in the desalinated condensed water after 4 hours of distillation under 1 sunlight intensity; c: the concentration of phenol in the desalinated condensed water after 4 hours of distillation under 2 sunlight intensities; and d: the concentration of phenol in the desalinated condensed water after 4 hours of distillation under 4 sunlight intensities);
FIG. 2 is a schematic diagram showing the concentration of phenol in the condensed desalted water obtained by adding peroxydisulfate to degrade phenol, (a: the concentration of a phenol mother liquor; b: the concentration of phenol in the condensed desalted water after 4 hours of distillation under 1 sunlight intensity; c: the concentration of phenol in the condensed desalted water after 4 hours of distillation under 2 sunlight intensity; d: the concentration of phenol in the condensed desalted water after 4 hours of distillation under 4 sunlight intensity);
FIG. 3 is a schematic diagram of the concentration of volatile organic pollutants in condensed desalted water obtained by adding peroxymonosulfate to degrade the volatile organic pollutants, (a: the concentration of mother liquor of the volatile organic pollutants; b: the concentration of phenol in the condensed desalted water after 4 hours of distillation under 1 sunlight intensity; c: the concentration of p-cresol in the condensed desalted water after 4 hours of distillation under 1 sunlight intensity; d: the concentration of p-chlorophenol in the condensed desalted water after 4 hours of distillation under 1 sunlight intensity);
FIG. 4 is a schematic diagram of the concentration of volatile organic pollutants in condensed desalted water obtained by adding peroxydisulfate to degrade the volatile organic pollutants, (a: the concentration of mother liquor of the volatile organic pollutants; b: the concentration of phenol in the condensed desalted water after 4h of distillation under 1 sunlight intensity; c: the concentration of p-cresol in the condensed desalted water after 4h of distillation under 1 sunlight intensity; d: the concentration of p-chlorophenol in the condensed desalted water after 4h of distillation under 1 sunlight intensity);
FIG. 5 is a schematic diagram of the concentration of phenol in condensed desalted water prepared by adding persulfate to degrade actual seawater to prepare phenol, (a: the concentration of a phenol mother liquor, (b: the concentration of phenol in condensed desalted water after PMS is added and distilled for 4 hours under 1 sunlight intensity, c: the concentration of phenol in condensed desalted water after PDS is added and distilled for 4 hours under 1 sunlight intensity));
FIG. 6 is a schematic diagram showing the amount of persulfate added to achieve the same phenol removal rate, (a: concentration of phenol mother liquor; b: concentration of phenol in the condensate desalted water after distillation of 0.1mmol/L Peroxymonosulfate (PMS) for 4 hours under 1 sunlight intensity; c: concentration of phenol in the condensate desalted water after distillation of 1mmol/L Peroxymonosulfate (PDS) for 4 hours under 1 sunlight intensity);
FIG. 7 is a schematic diagram showing the total organochlorine content produced by persulfate addition, (a: PMS addition produces the total organochlorine concentration, b: PDS addition produces the total organochlorine concentration);
FIG. 8 is a diagram of the EPE/PTFE/ALP/ALC/CB anti-salting out integrated distillation assembly process of the present application example.
Detailed Description
Firstly, the application provides an integrated distillation assembly, which comprises a photothermal conversion material 1, a water absorption material 2, a heat insulation material and a baffle 3, wherein the photothermal conversion material 1 is carbon black loaded by dust-free cloth, and the heat insulation material comprises a first heat insulation material 4 and a second heat insulation material 5; the baffle 3 is fixed on the upper surface of the first heat-insulating material 4, through holes are formed in the baffle and the first heat-insulating material, the water-absorbing material is fixed in the through holes, one end of the water-absorbing material is flatly laid on the surface of the baffle, the other end of the water-absorbing material extends out of the first heat-insulating material 4, the second heat-insulating material is wrapped and fixed on the periphery of the baffle and the first heat-insulating material, one end of the water-absorbing material is fixed between the baffle and the second heat-insulating material, and the photothermal conversion material 1 is fixed on the water-absorbing material on the surface of the baffle. When the integrated distillation component is manufactured, the baffle 3 and the first heat-insulating material 4 are fixed, through holes are formed in the baffle 3 and the first heat-insulating material 4, the water absorbing material 2 penetrates into the through holes, one end of the water absorbing material is unfolded and flatly laid on the surface of the baffle 3, the other end of the water absorbing material 2 extends out of the first heat-insulating material 4, the second heat-insulating material 5 is wrapped and fixed on the peripheries of the baffle 3 and the first heat-insulating material 4, one end of the water absorbing material is fixed between the baffle and the second heat-insulating material, then the photothermal conversion material 1 is fixed on the water absorbing material 2, the integrated distillation component is formed, and the integrated distillation component is placed in the distiller 6.
In some embodiments, the water-absorbing material is dust-free paper, and the first and second heat-insulating materials are polyethylene foam and polytetrafluoroethylene, and the polytetrafluoroethylene has the function of avoiding improving the persulfate oxidation resistance of the distillation assembly besides the heat-insulating function. The baffle adopts a polytetrafluoroethylene plate. The water absorbing material is dust-free paper.
The application also provides a distillation apparatus comprising the above-described integrated distillation assembly.
The application relates to a method for utilizing activated persulfate to reduce VOCs (volatile organic compounds) and enter photo-thermal distillation condensation to desalinate water, which comprises the steps of placing the integrated distillation assembly in the embodiment on seawater, adding 0.5-1mmol/LPDS or 0.1mmol/LPMS into the seawater, and then carrying out illumination distillation to desalinate the seawater. Preferably, the PDS is 1 mmol/L.
The embodiment of the application also provides the application of reducing VOCs in seawater into photothermal distillation condensation desalted water by using activated PDS or PMS, wherein the content of PDS is 1mmol/L, and the content of PMS is 0.1 mmol/L. The VOCs are phenol, p-cresol and p-chlorophenol.
The photothermal distillation test in this application is divided into the following four steps, including: firstly, weighing a certain amount of NaCl and VOCs, uniformly mixing, preparing VOCs salt solution with a certain concentration, and collecting 1mL of VOCs salt solution in a liquid phase vial; pouring the VOCs salt solution into a distiller, and covering an EPE/PTFE/ALP/ALC/CB anti-salting-out integrated distillation component on the solution; thirdly, placing the distiller under a solar simulator, and adjusting the height of the solar simulator according to the required illumination intensity; and fourthly, collecting the condensed desalted water in the distiller after 4h of distillation in a liquid phase small bottle, and respectively measuring the model pollutant concentrations in the initial solution and the distilled water by using high performance liquid chromatography.
Example 1
A laboratory is used for artificially simulating seawater (containing 1mg/L phenol and 3.5 wt% of NaCl) containing volatile organic pollutants as experimental water, 0.1mmol/L of Peroxymonosulfate (PMS) or 0.5mmol/L of Peroxydisulfate (PDS) is added, the removal effect of persulfate on VOCs in condensate desalted water after photo-thermal distillation is examined, and the results are respectively shown in a graph 1 and a graph 2. As is obvious from figure 1, under the irradiation of 1 sunlight intensity, after PMS is added, the concentration of phenol in the condensed and desalted water is 0.17mg/L and is far lower than that of the phenol stock solution. The phenol concentration in the distilled water was further decreased at 2 suns and 4 suns, which were 0.1mg/L and 0.04mg/L, respectively. As can be seen from FIG. 2, the phenol concentrations in the condensed and desalted water after PDS is added under 1, 2, 4 sunlight intensities are respectively 0.22, 0.2, 0.17 mg/L. The method for adding persulfate is proved to effectively reduce phenol entering condensed desalted water.
Example 2
The results of examining the removal effect of persulfate on VOCs in the condensate desalted water after the photothermal distillation using artificial simulated seawater (3.5 wt% NaCl) containing 1mg/L of phenol, p-cresol, and p-chlorophenol as experimental water and adding 0.1mmol/L of Peroxymonosulfate (PMS) or 1mmol/L of Peroxydisulfate (PDS) are shown in FIGS. 3 and 4, respectively. As can be seen from figure 3, under the irradiation of 1 sunlight intensity, after PMS is added, the concentrations of phenol, p-cresol and p-chlorophenol in the condensed desalted water are respectively 0.17mg/L, 0.11mg/L and 0.05mg/L which are far lower than the respective stock solution concentrations. As can be seen from FIG. 4, after PDS is added, the concentrations of phenol, p-cresol and p-chlorophenol in the condensed and desalted water are 0.2mg/L, 0.005mg/L and 0 mg/L. The method for adding persulfate can effectively reduce phenol, p-cresol and p-chlorophenol from entering the condensed desalted water, and the method has universality and can reduce other VOCs from entering the desalted water.
Example 3
The actual raw water containing 1mg/L of phenol was prepared from the sea water in the east China sea, 0.1mmol/L of Peroxymonosulfate (PMS) or 1mmol/L of Peroxydisulfate (PDS) was added, and the removal effect of the persulfate on VOCs in the condensed desalted water after photo-thermal distillation was observed, and the result is shown in FIG. 5. Under the irradiation of 1 sunlight intensity, the addition of PMS or PDS has a good reduction effect on phenol prepared in actual seawater, and the concentrations of condensed and desalted water are 0.012 and 0.16mg/L respectively, which shows that the method can effectively reduce VOCs in actual seawater.
Example 4
The seawater containing volatile organic pollutants (containing 1mg/L phenol and 3.5 wt% of NaCl) is artificially simulated in a laboratory to serve as experimental water, different amounts of PMS and PDS are respectively added, the influence of the adding amount of different types of persulfate on the phenol removal rate is examined, and the result is shown in figure 6, wherein the adding amount of 0.1mmol/LPMS is approximately the same as the adding amount of 1mmol/LPDS in the removal rate. And the determination of the total organic chlorine in the distilled water of the seawater (containing 10mg/L phenol and 3.5 wt% of NaCl) containing volatile organic pollutants by adding persulfate is researched, the result is shown in figure 7, the total organic chlorine generated by adding PMS is 0.5mg/L, and the total organic chlorine generated by adding PDS is 3.7mg/L, which indicates that the chlorine-containing by-products generated by PMS are less, and indicates that the adding of PMS is more appropriate from the aspects of adding amount and generating the chlorine-containing by-products in the method.
Claims (9)
1. An integrated distillation assembly characterized by: comprises a photothermal conversion material, a water absorption material, a heat insulation material and a baffle; the baffle is fixed on the upper surface of the first heat-insulating material, through holes are formed in the baffle and the first heat-insulating material, the water absorbing material is fixed in the through holes, one end of the water absorbing material is flatly laid on the surface of the baffle, the other end of the water absorbing material extends out of the first heat-insulating material, the second heat-insulating material is wrapped and fixed on the periphery of the baffle and the first heat-insulating material, one end of the water absorbing material is fixed between the baffle and the second heat-insulating material, and the photothermal conversion material is fixed on the water absorbing material on the surface of the baffle.
2. The integrated distillation assembly of claim 1, wherein: the photothermal conversion material is obtained by loading carbon black on dust-free cloth; the water absorbing material is dust-free paper.
3. The integrated distillation assembly of claim 1, wherein: the heat insulating material adopts polyethylene foam EPE and polytetrafluoroethylene PTFE.
4. The integrated distillation assembly of claim 1, wherein: the baffle adopts a polytetrafluoroethylene plate.
5. A distillation apparatus, characterized by: comprising the integrated distillation assembly of any of claims 1-4.
6. A method for utilizing activated persulfate to cut VOCs into photothermal distillation condensation to desalinate water is characterized by comprising the following steps: comprising placing the integrated distillation assembly of any of claims 1-4 on seawater, adding 0.5-1mmol/LPDS or 0.1mmol/LPMS to the seawater, and then performing light distillation to desalinate the seawater.
7. The application of reducing VOCs in seawater into photo-thermal distillation condensation desalinated water by using activated PDS or PMS.
8. Use according to claim 7, characterized in that: the dosage of PDS is 1mmol/L, and the PMS content is 0.1 mmol/L.
9. Use according to claim 7, characterized in that: the VOCs are phenol, paracresol and parachlorophenol.
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