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Preparation method of composite potassium permanganate sustained-release agent

A potassium permanganate, composite technology, applied in the oxidation water/sewage treatment and other directions, can solve the problems of non-selective consumption and low utilization rate of oxidants, achieve good product stability, lasting pollutant removal, and reduce a large amount of The effect of releasing the risk

Inactive Publication Date: 2013-01-30
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low oxidant utilization rate, large non-selective consumption, and mass transfer of oxidant in the process of in-situ chemical oxidation of liquid and powder potassium permanganate to remove groundwater pollutants, the present invention provides a chlorinated olefin used in groundwater Preparation method of composite potassium permanganate sustained-release agent for pollutant remediation, to achieve the purpose of slow release, effective transmission and efficient oxidation of oxidants

Method used

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  • Preparation method of composite potassium permanganate sustained-release agent
  • Preparation method of composite potassium permanganate sustained-release agent
  • Preparation method of composite potassium permanganate sustained-release agent

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Fix 6g of potassium permanganate powder and 12g of quartz sand, and change the ratio of paraffin wax to quartz sand (wax-sand ratio) by adjusting the quality of paraffin. First, put sliced ​​paraffin wax of different quality into different beakers, heat it with an electric furnace until the paraffin wax is completely melted, then pour 12g of silica sand and stir evenly, after the silica sand is completely infiltrated by paraffin wax, pour 6g of potassium permanganate powder , Stir evenly, quickly pour into the mold while hot, tamp, cool and shape. Cut out a small section containing 1g of potassium permanganate from the slow-release body with a wax-sand ratio of 1:1, 1:2, 1:4, 1:6, 1:10, 1:15, and 1:20, and seal it with paraffin Put the two ends into Erlenmeyer flasks with 400ml of pure water respectively, seal them in a dark place, store them at room temperature (20-25°C), and take samples regularly. Sampling time: frequent sampling in the early stage, sampling at 0.5,...

Embodiment 2

[0026] Two proportions of slow-release bodies were used, and the percentage of potassium permanganate content in the slow-release body was changed by changing the content of paraffin and silica sand, and its slow-release curve in water was measured. The preparation protocol was as described previously. The ratio of wax to sand is 1:1 and 1:4, and the ratio of various mass ratios is shown in Table 2. The slow-release curve is as follows: figure 2 . from figure 2 It can be seen that the cumulative release of potassium permanganate in the water with the same proportion of slow-release body increases with the increase of potassium permanganate content, and the release rate also increases with the increase of potassium permanganate content. For the slow-release body with the same proportion, if the ratio of paraffin and sand remains unchanged, the porosity of the slow-release body will not change significantly, and the increase in the mass percentage of potassium permanganate m...

Embodiment 3

[0030] First put 3g of sliced ​​paraffin into a beaker, heat it with an electric furnace until the paraffin is completely melted, then pour 12g of silica sand and stir evenly, after the silica sand is completely infiltrated by paraffin, pour 6g of potassium permanganate powder, stir evenly, Quickly pour it into the mold while it is hot, tamp it tightly, take it out after cooling and forming for later use. Cut off 1.8g of potassium permanganate sustained-release body, put into 120mL Erlenmeyer flask with initial TCE concentration of 40mg / L. Use 0.1mol / L HCl and 0.1mol / L NaOH to adjust the pH value of the TCE solution to 6.8, shake the reaction in an oscillator, take samples at regular intervals, and then measure the remaining content of TCE. The removal rate of TCE reached 87% within 1 hour, and the removal rate of TCE was 100% after 4 hours.

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Abstract

The invention discloses a preparation method of a composite potassium permanganate sustained-release agent. According to the invention, paraffin is added into a vessel and is heated, until paraffin is completely molten; silica sand is added into paraffin, and the mixture is well mixed by stirring; when silica sand is completely infiltrated by paraffin, potassium permanganate powder is added, and the mixture is well mixed by stirring; when still hot, the mixture is rapidly poured into a mold, and is tamped; and the mixture is cooled and molded, such that composite potassium permanganate sustained-release systems with different sustained-release times can be prepared. The method provided by the invention aims at solving problems of low oxidant utilization rate, large non-selective consumption, oxidizing agent mass transfer and the like in processes of underground water pollutant removing through liquid and powdery potassium permanganate in-situ chemical oxidation. Therefore, oxidant sustained-release, effective transferring, and high-efficiency oxidation are realized.

Description

technical field [0001] The invention relates to a preparation method of a composite potassium permanganate slow-release agent used for repairing groundwater chlorinated olefin pollutants. Background technique [0002] With the development of society and economy, a large number of organic solvents are used by human beings in practice. The unreasonable discharge and improper treatment of these organic substances will cause them to enter the environment and pollute groundwater resources. Chlorinated solvents (vinyl chloride) have been widely used in metal processing, electronics, dry cleaning, electroplating, organic synthesis and other industries. Due to their widespread use and unreasonable treatment, they pollute the soil and groundwater environment, making them the most widely used solvents. one of the pollutants. For example, trichlorethylene (TCE) is a cumulative anesthetic, which has a strong inhibitory effect on the central nervous system and is carcinogenic. When the ...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 苑宝玲付明来曾秋生
Owner HUAQIAO UNIVERSITY
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