Method for reducing VOCs entering photo-thermal distillation condensation desalinated water by using activated persulfate

A technology for distilling, condensing, and desalinating water. It is applied in chemical instruments and methods, oxidized water/sewage treatment, heating water/sewage treatment, etc. It can solve the problems of volatile desalinated water and water quality safety risks, and achieve high evaporation rate. , high salt resistance, and the effect of promoting degradation

Pending Publication Date: 2022-07-01
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the higher the temperature of the gas-liquid interface, the more favorable the evaporation of seawater to increase the yield of desalinated water, but the organic pollutants in seawater, especially VOCs, are more likely to volatilize, escape and condense into desalinated water, causing water quality safety risks

Method used

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  • Method for reducing VOCs entering photo-thermal distillation condensation desalinated water by using activated persulfate
  • Method for reducing VOCs entering photo-thermal distillation condensation desalinated water by using activated persulfate
  • Method for reducing VOCs entering photo-thermal distillation condensation desalinated water by using activated persulfate

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Experimental program
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Effect test

Embodiment 1

[0037] The laboratory artificially simulated seawater containing volatile organic pollutants (containing 1 mg / L phenol, 3.5 wt% NaCl) was used as the experimental water, and 0.1 mmol / L peroxymonosulfate (PMS) or 0.5 mmol / L peroxodisulfuric acid was added. Salt (PDS), to investigate the removal effect of persulfate on VOCs in condensed and desalinated water after photothermal distillation, and the results are as follows: figure 1 and figure 2 shown. from figure 1 It can be clearly seen that under the irradiation of one sunlight intensity, after adding PMS, the concentration of phenol in the condensed and desalinated water is 0.17 mg / L, which is far lower than the concentration of the phenol stock solution. When the light irradiation intensity was 2 suns and 4 suns, the concentration of phenol in distilled water decreased further, which were 0.1 mg / L and 0.04 mg / L, respectively. figure 2 It can be seen that at 1, 2, and 4 sunlight intensities, after adding PDS, the phenol c...

Embodiment 2

[0039] The artificial simulated seawater (3.5wt% NaCl) containing 1mg / L phenol, p-cresol and p-chlorophenol was used as experimental water, and 0.1mmol / L peroxymonosulfate (PMS) or 1mmol / L peroxodisulfate ( PDS) to investigate the removal effect of persulfate on VOCs in condensed and desalinated water after photothermal distillation, and the results are as follows: image 3 and Figure 4 shown. from image 3 It can be seen that under the irradiation of one sunlight intensity, after adding PMS, the concentrations of phenol, p-cresol and p-chlorophenol in the condensed and desalinated water are 0.17mg / L, 0.11mg / L and 0.05mg / L, respectively. much lower than their respective stock concentrations. from Figure 4 It can be seen that after adding PDS, the concentrations of phenol, p-cresol and p-chlorophenol in the condensed and desalinated water are 0.2 mg / L, 0.005 mg / L and 0 mg / L. It shows that the method of adding persulfate can effectively reduce the entry of phenol, p-creso...

Embodiment 3

[0041] Prepare raw water containing 1mg / L phenol with actual seawater from the East China Sea, and add 0.1mmol / L peroxymonosulfate (PMS) or 1mmol / L peroxodisulfate (PDS) to observe the condensation and desalination of persulfate after photothermal distillation. The removal effect of VOCs in water, the results are as follows Figure 5 shown. Under the irradiation of 1 sunlight intensity, adding PMS or PDS has a good reduction effect on the actual seawater configuration of phenol. VOCs in .

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Abstract

The invention discloses a method for reducing VOCs entering photo-thermal distillation condensation desalinated water by using activated persulfate, which comprises the following steps: placing an integrated distillation assembly on seawater, adding 0.5-1mmol / LPDS or 0.1 mmol / LPMS into the seawater, and then carrying out illumination distillation desalination on the seawater, the integrated distillation assembly comprises a photo-thermal conversion material, a water absorption material, a heat insulation material and a baffle plate; the baffle is fixed on the upper surface of the first heat insulation material, through holes are formed in the baffle and the first heat insulation material, the water absorption material is fixed in the through holes, one end of the water absorption material is flatly laid on the surface of the baffle, and the other end extends out of the first heat insulation material; the second heat insulation material is wrapped and fixed on the peripheries of the baffle and the first heat insulation material, so that one end of the water absorption material is fixed between the baffle and the second heat insulation material, and the photo-thermal conversion material is fixed on the water absorption material on the surface of the baffle. According to the invention, the oxidative degradation efficiency is greatly improved, and VOCs entering condensed desalinated water are reduced.

Description

technical field [0001] The invention belongs to the field of drinking water treatment, and in particular relates to the use of "high temperature-high-salt-light-light-photothermal material" multi-media synchronous activation of persulfate formed on the surface of a distillation component in the process of photothermal distillation of seawater desalination to reduce volatile organic compounds (VOCs) Enter the condensed desalinated water, thereby improving the water quality of the cold desalinated water. Background technique [0002] Desalination is considered to be one of the most effective ways to address global water shortages. The current seawater desalination processes, membrane methods (such as reverse osmosis) and thermal methods (such as multi-effect distillation, multi-stage flash evaporation) are high energy consumption processes, which not only cost high water production, but also cause air pollution, which is very important for islands with tight power supply. Not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/14C02F1/72C02F101/30C02F103/08
CPCC02F1/04C02F1/14C02F1/72C02F2101/30C02F2103/08Y02A20/212
Inventor 叶苗苗肖杨依张土乔李辰星
Owner ZHEJIANG UNIV
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