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Ozone contact optimal dosing method in drinking water treatment and device thereof

A drinking water treatment and ozone contact technology, which is applied in the field of water treatment, can solve serious problems such as water pollution and water shortage, and achieve the effect of improving ozone mass transfer efficiency and pollutant removal rate

Inactive Publication Date: 2013-06-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] There are three main problems in my country's water resources: first, the severe water shortage in the northern region caused by the extremely unbalanced distribution of regional water resources; second, the pollution of water bodies is becoming more and more serious; third, the serious waste of water resources

Method used

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  • Ozone contact optimal dosing method in drinking water treatment and device thereof
  • Ozone contact optimal dosing method in drinking water treatment and device thereof
  • Ozone contact optimal dosing method in drinking water treatment and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) Miyun Reservoir water is used as raw water;

[0058] 2) if figure 1 As shown, the serial ozone contact reaction device includes 4 reaction columns 6 connected in series, the reaction columns are stainless steel columns, each stainless steel column is 2m high, the inner diameter is 100mm, and the water volume is 65L; The diameter is 30mm, the length is 50mm, the pore diameter is 0.2-100μm, and the porosity is 28-60%; the top is provided with an exhaust port; each steel column is provided with 4 sampling ports 7 for easy sampling, the interval is 400mm, and the lower part of the first-stage reaction column is provided There are downstream water inlets / countercurrent water outlets 3, and the upper part of the fourth-stage reaction column is provided with downstream water outlets / countercurrent water inlets 4. The gas outlet of the oxygen generator is connected to the gas inlet of the ozone generator, and the gas outlet of the ozone generator They are respectively conne...

Embodiment 2

[0062] Step 1)-3) with embodiment 1

[0063] 4) Import the raw water into the serial ozone contact reaction device through the downstream water inlet / countercurrent outlet, open the vent port, open the first and second stage aeration heads, and close the rest, HRT12min, total ozone dosage 2mg / L , choose 5 kinds of ozone dosing ratios, which are 1:1, 2:1, 3:1, 3:2 and 4:1, respectively, and investigate the influence of dosing ratios on ozone concentration along the process and mass transfer efficiency ( image 3 ). When the dosing ratio is 3:2, the ozone concentration at the highest point is the largest at 1.06mg / L, and the ozone concentration in the effluent is 0.71mg / L. As the dosage of the first-stage ozone increases, the mass transfer efficiency of ozone first increases and then decreases; when the dosage of the first-stage ozone is large, the ozone cannot fully react with water in a short time, and the ozone emission at the vent port Larger, the mass transfer efficiency ...

Embodiment 3

[0065] Step 1)-3) with embodiment 1

[0066] 4) Lead the raw water into the serial ozone contact reaction device through the downstream water inlet / countercurrent outlet, open the vent, open the first, second and third aeration heads, turn off the fourth stage, HRT12min, total ozone dosing The amount of ozone is 2mg / L, and 5 kinds of ozone dosing ratios are selected, which are 1:1:1, 3:2:1, 2:2:1, 3:3:1 and 2:1:1. By examining the dosing ratio Effects on ozone concentration and mass transfer efficiency along the course ( Figure 4 ). Under the above ozone dosing ratios, the ozone mass transfer efficiencies were 82.0%, 78.8%, 76.9%, 86.8% and 82.4%, respectively. When the ozone dosing ratio is 3:3:1, the ozone effluent concentration is 0.39mg / L, which will not affect the subsequent activated carbon process.

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Abstract

The invention discloses an ozone contact optimal dosing method in a drinking water treatment and a device thereof. The optimal ozone dosing method is determined by changing the number of the dosing points and a dosing ratio of ozone, and investigating the effects of ozone concentration changes along the way, ozone mass transfer efficiency, CT (Captive Test) values and a pollutant removal rate. Researches show that when aeration is generated at three points, and the dosing ratio of the ozone is 3:3:1, the ozone mass transfer efficiency reaches 86.8%, the UV (Ultraviolet) 254 removal rate is 52.9%, the effluent ozone concentration is 0.39mg / L, after KBr (potassium bromide) is added, bromate has the lowest production amount, and is the optimal ozone dosing ratio. The ozone contact optimal dosing method in the drinking water treatment and the device thereof have the advantages of obviously improving the ozone mass transfer efficiency and the pollutant removal rate by optimizing the ozone dosing method, effectively controlling the production of the bromate without increasing the total ozone dosing quantity, having no impact on a subsequent biological activated carbon process, and having safety and economy.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a treatment device for improving ozone mass transfer efficiency and pollutant removal rate by changing the number of ozone dosing points and the ozone dosing ratio of an ozone contact tank. Background technique [0002] There are three main problems in my country's water resources: first, the severe water shortage in the northern region caused by the extremely unbalanced distribution of regional water resources; second, the increasingly serious water pollution; third, the serious waste of water resources. Since July 1, 2007, the new "Drinking Water Hygienic Standard" has been implemented. This standard has strengthened the requirements for water quality organic matter, microorganisms and water quality disinfection, and the drinking water quality index has increased from 35 in the original standard to 106. item. The new standard clearly stipulates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78G01N21/78G01N21/33G01N30/02
Inventor 周北海袁蓉芳田烨花朵
Owner UNIV OF SCI & TECH BEIJING
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