Preoxidation-coagulation algae removing method based on in-situ generation of double coagulants

An in-situ generation and pre-oxidation technology, which is applied in the fields of oxidized water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of lack of relevant structures, high investment, and high operating costs, and achieves easy operation and operation. The effect of low cost and simple construction operation process

Active Publication Date: 2013-12-11
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air flotation or floating sink process is the best algae removal process, but most of the water plants do not have relevant structures, and it takes a lot of investment to carry out engineering transformation
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

[0030] Eutrophic pollution occurred in the water source of a water plant, the concentration of algae cells reached 100,000 / ml, the turbidity of raw water was 20NTU, and 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 10mg / 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 20mg / L, and the treatment effect was still unsatisfactory. The efficiency is only 80%, and the filtration cycle of the filter is shortened to 21 hours.

[0031] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0032] 1) Mix ozone and aluminum chloride with water and dissolve under sufficient stirring to obtain an aqueous solution...

Embodiment 2

[0037] Eutrophic pollution occurred in the water source of a water plant, the concentration of algae cells reached 1.2 million / ml, the turbidity of raw water was 50 NTU, and the flocculant used in the water plant was aluminum sulfate. When there is no eutrophication pollution in the water source, the dosage of flocculant is 15mg / 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 30mg / L, and the treatment effect was still unsatisfactory. The efficiency is only 75%, and the filter cycle is shortened to 20 hours.

[0038] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0039] 1) Mix calcium hypochlorite and aluminum sulfate with water, dissolve under sufficient stirring to obtain aqueous solutions of calcium hypochlorite and a...

Embodiment 3

[0043] Eutrophication pollution occurred in the water source of a water plant, the concentration of algae cells reached 5 million / ml, the turbidity of raw water was 180NTU, and the flocculant used in the water plant was aluminum sulfate. When there is no eutrophication pollution in the water source, the dosage of flocculant is 15mg / 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 the flocculant was increased to 50mg / L, and the treatment effect was still unsatisfactory. The efficiency is only 50%, and the filter cycle is shortened to 18 hours.

[0044] Adopt the method of the present invention to strengthen algae removal to the above-mentioned water source polluted by eutrophication:

[0045] 1) Mix potassium permanganate with water and dissolve under sufficient stirring to obtain an aqueous solution of potassium permanganate; mix polym...

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Abstract

The invention belongs to the technical field of drinking water treatment, and particularly relates to a preoxidation-coagulation alga removing method based on in-situ generation of double coagulants. Aiming at the eutrophication pollution of lake, reservoir and other surface water sources, the invention provides a method of sequentially feeding an oxidant, a ferrite, an aluminum salt and the like, wherein a preoxidant is used for inactivating algae cells, the ferrite is used for terminating preoxidation to control the continuous release of organic matters in the algae cells, and at the same time, the ferrite is oxidized to generate new-state ferric iron and aluminum salt to be used as double coagulants; and the coagulation of the preoxidized algae cells is enhanced. The method is mainly applied to purification in drinking water plants, and can also be applied to landscape water treatment with landscape water reclamation as the aim, and water source pretreatment of eutrophicated water to inhibit the growth of the algae cells.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, in particular to a pre-oxidation-coagulation algae removal method based on in-situ generation of double coagulants. Background technique [0002] Lakes, reservoirs, etc. are commonly used surface water sources. For example, my country's Beijing, Shanghai, Harbin, the city group around Taihu Lake, and the 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 cause algal blooms in the water under suitable environmental conditions. It has become an important hidden danger affecting the water treatment process and the safety of drinking water quality. In recent years, there have been many algae outbreaks in drinking water sources in my c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/72
Inventor 曲久辉马敏刘锐平刘会娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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