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Method for controlling growth of microcystis aeruginosa through combination of copper salt and chloramine

A technology of Microcystis aeruginosa and chloramine, which is applied in the field of drinking water treatment, can solve the problems of high operating cost, large investment, and lack of relevant structures, etc., and achieves the advantages of simple engineering construction operation process, low cost, and good algae inhibition effect Effect

Inactive Publication Date: 2013-03-20
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Air flotation or floating sink technology is the best algae removal technology, but most water plants do not have relevant structures, and engineering transformation requires a lot of investment
The use of membrane separation technology not only requires a large investment, but also higher operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Eutrophication pollution occurred in the water source of a water plant. The concentration of Microcystis aeruginosa cells reached 100,000 / ml, and the turbidity of raw water was 15 NTU. The flocculant used in the water plant was aluminum chloride. When there is no eutrophication pollution in the water source, the dosage of flocculant is 15 mg / L to achieve a good removal effect, and the filtration cycle of the filter is 24 hours. However, after the above-mentioned eutrophication pollution occurred in the water source, the dosage of flocculant was increased to 25 mg / L, and the treatment effect was still unsatisfactory. The removal rate is only 80%, and the filtration cycle of the filter is shortened to 22 hours.

[0021] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0022] Step 1: mixing liquid chlorine and ammonium sulfate with water, dissolving under sufficient stirring to obtain a...

Embodiment 2

[0028] Eutrophic pollution occurred in the water source of a water plant, the concentration of algae cells reached 1 million / ml, the turbidity of raw water was 40 NTU, and the flocculant used in the water plant was aluminum sulfate. When there is no eutrophication pollution in the water source, the flocculant dosage is 20 mg / L (calculated as aluminum) to achieve a good removal effect, and the filtration cycle of the filter is 24 hours. However, after the above-mentioned eutrophication pollution occurred in the water source, the dosage of flocculant was increased to 30 mg / L, and the treatment effect was still unsatisfactory. Only 70%, the filter cycle is shortened to 18 hours.

[0029] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0030] Step 1: mix calcium hypochlorite and ammonium chloride with water, dissolve under sufficient stirring, and obtain an aqueous solution of calcium hypochlo...

Embodiment 3

[0036] Eutrophication pollution occurred in the water source of a water plant. The concentration of Microcystis aeruginosa growth cells reached 5 million / ml, and the turbidity of raw water was 200 NTU. The flocculant used in the water plant was polyaluminum chloride. When eutrophication pollution does not occur, a good removal effect can be achieved with a flocculant dosage of 25 mg / L (calculated as aluminum), and a filtration cycle of 24 hours. However, after the occurrence of eutrophication pollution, the dosage of flocculant was increased to 50 mg / L, and the treatment effect was still unsatisfactory. The turbidity of the water after sinking and filtration increased, and the removal rate of algae cells after sinking was only 40%. , The filter cycle is shortened to 15 hours.

[0037] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0038] Step 1: Mix sodium hypochlorite and ammonium sulfate ...

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Abstract

The invention belongs to the technical field of treatment of drinking water, and provides a method for controlling growth of microcystis aeruginosa through combination of copper salt and chloramine, aiming at the pollution caused by the eutrophication of surface water sources such as lakes and reservoirs. The method comprises the following steps in sequence: mixing an aqueous solution containing active chlorine with an ammonium salt aqueous solution so that the pH (Potential of Hydrogen) is 8 to 10, wherein the mole ratio of hypochlorite to ammonium ion is 0.1 to 1.0; fully stirring for 20 to 40 minutes until active chlorine and the ammonium salt are completely reacted, so as to obtain the aqueous solution of chloramine; mixing the aqueous solution of copper salt and the aqueous solution of chloramine with the water containing microcystis aeruginosa at the same time; and processing for 1 to 20 days, wherein the mole ratio of the copper ion to the chloramine is 0.04 to 0.5; and the ratio of the chloramine to the frustule is 0.5 to 20mg:10<8> to 5x10<9> parts. By adopting the method, the integrity of frustule walls can be damaged, and the benefit is provided for the copper ion to act on the cytoplasm, so that the frustule can be further inactivated.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and in particular relates to a method for controlling the growth of Microcystis aeruginosa through the combined use of copper salt and chloramine. Background technique [0002] Lakes, reservoirs, etc. are commonly used surface water sources. For example, my country's Beijing, Shanghai, Harbin, the urban agglomeration around Taihu Lake, and cities along the Yellow River all use lake or reservoir water as their surface water source. However, due to the discharge of nutrient sources such as nitrogen and phosphorus, many lakes and reservoirs with the function of drinking water sources show different degrees of eutrophication trends, and may lead to algal blooms under suitable environmental conditions, becoming a source of water pollution. It is an important hidden danger in the process of plant treatment and the safety of drinking water quality. In recent years, there have been man...

Claims

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Application Information

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IPC IPC(8): C02F1/76C02F1/50
Inventor 张东孙静娴刘茵黄怡张国芳兰华春刘锐平马敏刘会娟
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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