Method for removing bromide ion out of bromide ion-containing drinking water

A bromide ion and drinking water technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as high investment costs, difficult technical management, and large impact of content, and reach the level of chemical consumption Less, strong adsorption capacity and water purification performance, strong acidification effect

Active Publication Date: 2013-07-24
常州通用自来水有限公司
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Problems solved by technology

[0004] Among the current treatment methods for bromide ions in water, chemical oxidation, silver-loaded activated carbon adsorption, ultrafiltration, nanofiltration, magnetic resin and other technologies can achieve better removal effects, but these methods have technical limitations in the application of drinking water treatment processes. Difficult management and high investment costs
In addition, some studies have used AlCl 3 As a coagulant, coagulation can remove bromide ions in water to a certain extent, but it is greatly affected by the content of organic matter, and the effect is not good when the pH is greater than 7

Method used

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  • Method for removing bromide ion out of bromide ion-containing drinking water
  • Method for removing bromide ion out of bromide ion-containing drinking water

Examples

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Embodiment 1

[0018] Embodiment 1 laboratory small test research

[0019] The method for removing bromide ions in drinking water containing bromide ions is carried out in the following steps:

[0020] (1) Add potassium permanganate to the raw water containing bromide ions (bromine concentration 100~1000μg / L, pH6~9) for pre-oxidation, the dosage is 0.5~1mg / L, six-way mixer (100r / min) Stir to fully mix the agent and raw water, pre-oxidize for 3~5min;

[0021] Add polyaluminum chloride, stir with a six-way mixer (200~300r / min) for 30s, then add ferric chloride, (the mass concentration ratio of polyaluminum chloride (calculated as Al) and ferric chloride (calculated as Fe) 3:2), the dosage of the total coagulant is 20~30mg / L (calculated as Al and Fe); 3. Coagulate and stir the raw water added with polyaluminum chloride and ferric chloride, First stir at 300r / min for 1min, then stir at 80r / min for 5min, and finally stir at 40r / min for 5min (simulating the coagulation process in a water plant);...

Embodiment 2

[0022] Example 2 Large-scale water plant experiment

[0023] Relying on the ozone-biological activated carbon process pilot plant of a water plant, the results of the bromide ion-containing raw water of the water plant were verified. figure 1 .

[0024] The parameters are as follows: raw water: water temperature 23°C, pH value 8.0, turbidity 21.4NTU, potassium permanganate index 3.73mg / L, TOC 4.540mg / L, bromide ion concentration 650mg / L. The total time of coagulation and sedimentation is 1h, the dosage of ozone is 2mg / L, the contact time is 15min, and the amount of chlorine added in the disinfection stage is 2mg / L.

[0025] The present invention removes the method for bromide ion in drinking water containing bromide ion:

[0026] (1) Before the coagulation process, add potassium permanganate to the raw water containing bromide ions, the dosage of potassium permanganate is 1 mg / L, and pre-oxidize for 4 minutes;

[0027] (2) Add polyaluminum chloride to the raw water after po...

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Abstract

The invention relates to a method for removing bromide ions out of bromide ion-containing drinking water. The method is characterized by comprises the following steps of: before the bromide ion-containing drinking water is treated by using an ozone-biologic activated carbon process, adding 0.5-1mg/L potassium permanganate into raw water, preoxidizing for 3-5 minutes, and then sequentially adding 12-18mg/L polymeric aluminum by Al and 8-12mg/L ferric trichloride by Fe for coagulating, wherein the mass concentration ratio of polymeric aluminum to ferric trichloride is 3:2. The method is simple to operate and safe and reliable, the bromide ion content (100-100mu g/L) of the raw water is reduced by 45-70%, and the purpose of controlling the bromine disinfection by-product generation in the later ozonation bromate and disinfection period is reached; therefore, the method has wide application prospects.

Description

technical field [0001] The invention relates to a method for controlling and removing bromide ions in raw water containing bromide ions, which belongs to the drinking water treatment process. Background technique [0002] In recent years, with the deterioration of raw water quality and the gradual improvement of drinking water quality hygiene standards, ozone-biological activated carbon technology, which has unique water purification advantages, has been more and more applied to the field of drinking water treatment. However, at present, many water sources are affected by natural factors such as salt tide immersion or human factors such as fish farming and baiting. If there is a certain concentration of bromide ions in the raw water, bromide ions will generate 2B in the ozone oxidation process of the ozone-biological activated carbon process in the water plant. Bromate, a potential hereditary carcinogen, is difficult to be effectively and stably removed by the subsequent bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/52C02F101/12
Inventor 陈卫林涛周悦
Owner 常州通用自来水有限公司
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