Drinking water electrochemical preoxidation device and method

A pre-oxidation and electrochemical technology, which is applied in the oxidation water/sewage treatment, electrolysis components, electrolysis process, etc., can solve the problems of unsatisfactory odor and odor removal, insufficient iron active sites, and high cost of chemicals, and achieves enhanced pre-oxidation. The effect of improving the oxidizing ability, improving the pre-oxidizing energy, and improving the coagulation effect

Active Publication Date: 2012-10-24
PIPE NETWORK MANAGEMENT BRANCH OF BEIJING WATERWORKS GRP CO LTD +1
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Problems solved by technology

The cost of prechlorination is low, the sterilization effect is good, and the effect of coagulation and turbidity can be significantly improved, but it is easy to produce chloroform, bromodichloromethane, bromoform, monobromoacetic acid, dichloroacetic acid, Disinfection by-products such as dibromoacetic acid and trichloroacetic acid, and the removal of odor and taste is not ideal
[0003] Ozone can effectively kill microorganisms, algae and oxidatively degrade many organic pollutants. However, when bromide ions are contained in water, ozone will oxidize bromide ions into bromate and hypobromite, which are more toxic disinfection by-products. In addition, currently used Ozone needs to be prepared on site, and the cost is high, which also limits its wide application
Potassium permanganate has a certain effect in removing trace organic matter and peculiar smell in water, and controlling chlorinated disinfection by-products, but if the dosage is not properly controlled, there will be secondary pollution of manganese
The oxidizing and bactericidal ability of chlorine dioxide is significantly higher than that of chlorine gas, but the price is high and not stable enough. When the volume ratio of chlorine dioxide is more than 10%, it may explode when it is subjected to strong light or strong vibration, and it is not safe for transportation and use.
Chinese patent CN200510009889.0 "O 3 /H 2 o 2 Pre-oxidation and conventional water treatment process syne

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  • Drinking water electrochemical preoxidation device and method
  • Drinking water electrochemical preoxidation device and method
  • Drinking water electrochemical preoxidation device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: electrochemical generation hydrogen peroxide

[0037] Using tap water in the laboratory, the test of electrochemically generating hydrogen peroxide was carried out without adjusting the pH value of the raw water and without adding electrolyte. Electrolysis conditions: electrode spacing 1cm, electrode inclination θ=60°, current density: 1.99mA / cm 2 , the amount of air introduced: 0.1m 3 / h, the water-gas volume ratio converted to air intake is 1:10~1:30, and the water flow corresponding to the applied current per ampere is 9~45L / h. The anode is a titanium ruthenium iridium mesh electrode, the cathode is a graphite felt cathode, and the apparent area of ​​the electrodes is 160cm 2 . Sampling at the outlet of the electrolyzer to monitor the concentration of hydrogen peroxide in the water. Under different water flow conditions, the concentration of hydrogen peroxide in water is shown in Table 1.

[0038] Table 1 The variation of the concentration of elect...

Embodiment 2

[0041] Embodiment 2: Generation experiment of hydroxyl free radical under neutral condition

[0042] Test method: Under certain electrolysis conditions, the benzoic acid solution is electrolyzed and tested after passing through the iron-silicon filter column. Electrode inclination θ=60°, current density: 2mA / cm 2 , flow rate: 25mL / min, gas volume: 0.05m 3 / h, the water-gas volume ratio of air intake is about 1:30, the water flow rate corresponding to the applied current per ampere is about 5L / h, and the pole spacing: 1cm. Electrolyte: benzoic acid solution, initial concentration of benzoic acid: 20mg / L, pH=7. The filling height of the iron-silicon filter material is about 30cm, and the diameter of the filter column is 3cm. Sampling and testing method: benzoic acid concentration and fluorescence photometric test after 20 minutes of electrolysis on-line sampling, ① Determination of benzoic acid concentration: UV spectrophotometry, the maximum absorption wavelength is 221nm; ②...

Embodiment 3

[0044] Example 3: Using electrochemical direct pre-oxidation technology to purify raw water

[0045] Experimental conditions: the titanium ruthenium iridium mesh electrode is used as the anode, the graphite felt is used as the cathode, and the apparent area of ​​the electrodes is 160cm 2 , the electrode inclination angle θ=60°, the water flow rate is 100-400mL / min, and the ventilation volume is 0.1-0.5m 3 / h, the current density is 0.5~20mA / cm 2 , the volume ratio of water and air into the water is 1:4~1:17, and the water flow rate corresponding to the applied current per ampere is 9~75L / h. Table 2 shows the water quality parameters tested after the effluent from the electrolyzer was coagulated and precipitated, clarified and filtered. The coagulation parameters are as follows: add 30 mg / L polyaluminum chloride (PAC) to the water sample, first stir at a speed of 100 r / min for 1 min, then stir at a speed of 50 r / min for 15 min, and take the supernatant liquid after standing f...

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Abstract

The invention relates to a method for raw water preoxidation with an electrochemical preoxidation device, which includes a hydrogen peroxide electroproduction appratus and a hydroxyl free radical generating apparatus. Raw water flows through the hydrogen peroxide electroproduction apparatus taking a graphite felt electrode as a negative electrode and a reticular ruthenium-iridium plated titanium electrode as a positive electrode, and air is introduced from the bottom of the apparatus for electrolysis to produce hydrogen peroxide and other active oxygen free radicals, so that the bacteria, turbidiness, odor and smell and the like of a water body can be eliminated. If the raw water has a high organic substance content and turbidiness, the water can further flow through the hydroxyl free radical generating apparatus. With no need for any additional chemical reagent, the device and method of the invention can reduce the total bacteria, turbidiness, odor and smell of the raw water, and avoid the problem of generation of a large number of disinfection by-products from prechlorination, thus being able to serve as a preoxidation technology for a water supply plant or a water treatment means for other purposes.

Description

technical field [0001] The invention relates to a device and method for electrochemically treating slightly polluted drinking raw water, which can be used as a pre-oxidation treatment means for drinking water. Specifically, it is a kind of strong oxidizing substances such as hydrogen peroxide and hydroxyl radicals produced by electrochemical method for sterilization and disinfection, preventing water plant equipment pollution, removing precursors of disinfection by-products, improving coagulation effect, and removing odor and taste. Method and reaction device thereof. Background technique [0002] In the waterworks, after the raw water with poor water quality enters the plant, it is usually pre-oxidized first to sterilize, kill algae, kill plankton, prevent water plant equipment from being polluted, oxidize and decompose organic matter, and improve the effect of coagulation and turbidity reduction . Pre-oxidation treatment is referred to as pre-oxidation. The chemicals ad...

Claims

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Application Information

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IPC IPC(8): C02F1/72C25B1/30
Inventor 万平玉初必旺刘永康赵顺萍陈咏梅苗杰杨扬杨晓进杨春玲刘小光
Owner PIPE NETWORK MANAGEMENT BRANCH OF BEIJING WATERWORKS GRP CO LTD
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