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Method of removing and purifying microcystin in drinking water

A microcystin and drinking water technology, applied in the field of water treatment, can solve the problems of decreased toxicological safety and insufficient removal capacity of dissolved pollutants, and achieve high industrial application prospects, strong removal pertinence, and toxicological safety sex high effect

Inactive Publication Date: 2009-11-25
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional water treatment processes (coagulation, sedimentation, filtration, disinfection) can only remove suspended solids and colloidal particles in the water, but the ability to remove trace or even trace dissolved pollutants in polluted water sources is obviously insufficient
What's more serious is that organic substances such as humic acid, which are ubiquitous in source water, can easily react to form three-cause (inducing, teratogenic, and carcinogenic) substances and precursors (THMFP) after chlorine disinfection, which reduces the toxicological safety of water.

Method used

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  • Method of removing and purifying microcystin in drinking water
  • Method of removing and purifying microcystin in drinking water
  • Method of removing and purifying microcystin in drinking water

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Influence of Liquid Phase Ozone Concentration on Advanced Treatment of Raw Water

[0025] From figure 2 It can be seen that the removal rate of algae toxins increases with the increase of liquid phase ozone dosage. Under the same conditions, MC-LR has a removal rate of 80.3% for MC-LR at a reaction temperature of 25°C, a pH of 7.0, a reaction time of 30 min, and a liquid phase ozone concentration of 1 mg / L. The removal rate of MC-RR It was 77.6%; when the ozone concentration was increased to 3mg / L, the removal rate of MC-LR was 90.3%, and the removal rate of MC-RR was 85.7%; when the ozone concentration was increased to 5mg / L, the removal rate of MC-LR The rate is 95.7%, and the removal rate of MC-RR is 89.3%. In fact, the whole reaction is a fast and then slow process in the process of removing algae toxins. Taking 5mg / L ozone concentration as an example, the removal efficiency of MC-LR has reached 94.4% in the first 10 minutes of the reaction, and MC-RR The remova...

Embodiment 2

[0028] Effect of DOC on removal of algal toxins

[0029] Since there will inevitably be a lot of organic matter in surface water, the study of the effect of organic matter on the degradation of algal toxins is also very necessary. Taking humic acid with relatively large background content in water as a representative organic matter, the removal efficiency of ozone on algal toxins under different DOC concentrations was investigated. In the research on the influence of DOC, because there is a certain amount of organic interference in the algae culture concentration, the concentration of the amount of DOC added in the research process changes, so the present invention uses the extracted pure algae toxin as the research target. image 3 It shows the effect of different initial DOC concentrations on the degradation of algae toxins under the condition of ozone concentration of 3mg / L. With the increase of DOC concentration in the solution system, the degradation rate and efficiency o...

Embodiment 3

[0031] Free radical scavengers (NaHCO 3 ) on the removal of algal toxins

[0032] The removal of organic matter in water by ozone is the result of two different pathways: direct attack of ozone molecules and indirect free radical reaction. A certain amount of carbonate (CO 3 2- ) and bicarbonate (HCO 3 - ) ions, and these ions (mainly bicarbonate) are typical free radical inhibitors, they can capture the OH produced by ozone, thereby blocking the indirect reaction pathway of ozonation reaction and affecting the removal of organic matter in water by ozonation reaction Effect. The invention investigates the influence of bicarbonate ions in water body on the ozonated algae toxin. As shown in Table 1, free radical scavengers (NaHCO 3 ) will significantly reduce the removal efficiency of algal toxins. Therefore, NaHCO in water should be reduced as much as possible. 3 content in order to improve the removal effect of algal toxins

[0033] Table 1 The effect of free radical...

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Abstract

Method of removing and purifying microcystin in drinking water belongs to water treatment technology field. The invention uses ozone oxidation-activated carbon fiber combination to remove algae toxin in drinking water: 1) taking water from water source and reducing COD, SS regualr indicators in water source by pretreatment of mixed coagulating, depositing and filtering; 2) using ozone oxidation method to remove microcystin and reduce DOC in water, using jet mixing technology in the treatment to react completely, dosage of liquid ozone is 1-5 mg / L, pH 7.0, reacting at room temperature for 30 minutes to obtain more than 95% removal rate of microcystin and more than 80% DOC degradation rate; 3) after ozone oxidation the discharged water entering activated carbon fiber treatment process, using activated carbon fiber absorbtion method to remove incompletely degradated microcystin and small molecular organic compounds brought by ozone oxidation; the discharged water meeting the standard of national 2006 GB5749-2006.

Description

technical field [0001] The invention discloses a method for removing and purifying microcystin in drinking water, which belongs to the technical field of water treatment. Background technique [0002] The pollution of water environment in China is becoming more and more serious, and the safety of drinking water caused by it has received more and more attention. At present, the research on the cyanobacteria bloom caused by the eutrophication of the water body and the removal of algal toxins (mainly microcystins, MCs) has become a research hotspot in the field of water environment and water pollution. A large number of research results have shown that even at "acceptable" low concentrations, these pollutants can still cause significant impacts on humans and organisms. Therefore, the effective removal of MCs in drinking water has become an important problem to be solved urgently in terms of drinking water safety. [0003] The massive reproduction of algae in eutrophic water b...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78C02F1/28
Inventor 阮文权缪恒锋
Owner JIANGNAN UNIV
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