A method for reducing the formation of disinfection by-products in water treatment

A technology for disinfection by-products and water treatment, applied in the field of water treatment, can solve the problems of low redox potential and slow pre-oxidation speed, and achieve the effects of overcoming uneven mixing of water and gas, strong oxidizing ability and improving efficiency

Active Publication Date: 2016-06-08
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium permanganate, as a metal pre-oxidant, has the advantage of reducing the generation of disinfection by-products, but due to the low oxidation-reduction potential and slow pre-oxidation speed, a certain amount of purple remains in the water, so it is also limited to a certain extent.

Method used

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  • A method for reducing the formation of disinfection by-products in water treatment
  • A method for reducing the formation of disinfection by-products in water treatment
  • A method for reducing the formation of disinfection by-products in water treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The reaction was carried out in a tank containing 1L Microcystis aeruginosa cell suspension (7.32×10 7 cell / L) in the six-coagulation mixer, the specific steps are as follows:

[0031] (1) Pre-oxidation stage: add a certain dose of potassium ferrate (0.5-20mg / L) to the water, react quickly at a speed of 200r / min for 10min, and control the reaction pH at 6-12; Take 50mL sample at 2cm, quench with 0.5M sodium sulfite, filter with 0.45μm membrane, test dissolved organic carbon concentration (DOC), potassium ion concentration (K + ) and UV absorption value at 254nm (UV 254 ).

[0032] (2) Pre-oxidation-intensified coagulation and precipitation stage: Add coagulant polyaluminum chloride (PAC, 10mg / L) to the water sample obtained in step (1), and first stir rapidly at a speed of 200r / min for 3min , and then slowly stirred at 40r / min for 15min, then statically settled for 30min; after statically settling, take 50mL of water sample at 2cm underwater, quench with 0.5M sodium ...

Embodiment 2

[0037] The reaction was carried out in a tank containing 1L algae cell suspension (Microcystis aeruginosa (7.32×10 7 cell / L)) in the six-coagulation mixer, adding a certain dose of potassium ferrate (0, 0.5, 1.0, 2.0mg / L, 5.0mg / L, 10.0mg / L, 20.0mg / L) to the water L), react quickly with a rotating speed of 250r / min for 30min, and the pH is controlled at 6-12; Stir slowly at 40r / min for 15min (when the dosage of high iron is increased to above 5mg / L, the reaction time is based on the disappearance of the purple color of the solution as the reaction end time), then settle for 30min; Add sodium hypochlorite (12.8 mg / L as available chlorine) for chlorination, react in the dark for 3 days, and measure the chloroform concentration (TCMFP).

[0038] Such as figure 1As shown, compared with simple coagulation and precipitation, when the dosage of potassium ferrate was 0.5-20 mg / L, TCM was reduced by 10%, 26%, 38, 52, 78 and 82%, respectively. It can be seen that ferrate preoxidation-...

Embodiment 3

[0040] The reactions were carried out in 1L Microcystis aeruginosa (7.32×10 7 cell / L) cell suspension and Cyclotella menielis (2.06×10 7 cell / L) in the six-coagulation agitator of the cell suspension, add a certain dose of potassium ferrate (0, 0.5, 1.0, 2.0mg / L) to the water of different algae cell suspensions respectively, at 250r / L min speed reaction for 30 min; add coagulant polyaluminum chloride (PAC, 10mg / L), first stir quickly at 200r / min for 3min, then slowly stir at 40r / min for 15min, then settle for 30min; After sinking, take 100mL of water sample at 2cm below the water, add sodium hypochlorite (12.8mg / L in terms of available chlorine) for chlorination, react in the dark for 3 days, and measure its TCMFP.

[0041] Such as figure 2 It was shown that after adding ferrate, the precursors of TCM were effectively removed during the enhanced coagulation process of the two algae cells. Ferrate has strong oxidizing properties in water, can destabilize various algae, oxid...

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Abstract

The invention discloses a method for reducing disinfection by-products generated from water treatment. The method comprises the following specific steps: adding 0.5-20mg / L of ferrate to to-be-treated water, and stirring for 10-30 minutes at the rotating speed of 200-500r / min, wherein the pH range is 6-12; adding 5-15mg / L of coagulant, stirring for 3-5 minutes at the rotating speed of 150-250r / min, stirring for 10-30 minutes at the speed of 20-60r / min, and standing for 30-60 minutes to precipitate; sucking supernate at the position which is 1-3cm far away from the liquid level after precipitating; and adding a sodium hypochlorite solution to the supernate, and disinfecting, wherein the adding amount of sodium hypochlorite is 3-12.8mg / L. Compared with a conventional process, the method disclosed by the invention has the advantages that the content of the disinfection by-products can be greatly lowered by ferrate preoxidation enhanced coagulation and sodium hypochlorite disinfection under the premise that drinking water meets the disinfection effect; the method is simple to operate and low in investment; and large-scale reconstruction on an existing water works process is not required.

Description

technical field [0001] The invention relates to water treatment technology, in particular to a method for reducing the generation of disinfection by-products in water treatment. Background technique [0002] Due to my country's population growth and the acceleration of urbanization, the development of industry and agriculture, especially the extensive use of agricultural chemical fertilizers and pesticides, the nitrogen, phosphorus, potassium and other nutrients discharged into lakes and reservoirs have increased. A large-scale algae bloom occurred, causing a crisis in urban water supply. With the increasing environmental pollution, algae blooms occurred frequently in water supply sources in Fujian Province. [0003] The massive reproduction of algae in the water source seriously affects the quality of drinking water and threatens human health. Early studies have shown that algal cells will produce a large number of carbon-containing disinfection by-products (C-DBPs) during...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/50C02F1/5236C02F1/72C02F9/00C02F2301/08C02F2303/04
Inventor 苑宝玲廖晓斌刘津津何强杨名丽周真明
Owner HUAQIAO UNIVERSITY
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