Method for phyisochemical enhanced algae removal

A technology for killing algae and algae cells, which is applied in the field of drinking water treatment, and can solve problems such as cell wall structure damage, difficulty in destabilization, and algae outbreaks, and achieves the effects of simple operation, low cost, and simple method

Inactive Publication Date: 2015-09-23
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

[0002] Due to the discharge of nutrient sources such as nitrogen and phosphorus, many water sources such as rivers, lakes and reservoirs that have the function of drinking water sources show different degrees of eutrophication trends, and may lead to algal blooms under suitable environmental factors, which has become an impact. Important hidden dangers in water treatment process and drinking water quality safety
[0003] The adverse effects of algae-containing water or high-algae water on drinking water treatment process and drinking water quality safety are mainly as follows: 1) Algae cells are electronegativity and are not easy to destabilize through coagulation, especially for surviving algae cells. Removal by coagulation and sedimentation units may cause algal cells to multiply in structures such as reaction tanks, sedimentation tanks, and filters, and may penetrate the filter membrane of the filter tank and enter the water distribution network; 2) penetrate the filter membrane of the filter tank The algae cells may further reproduce and grow in the water distribution pipes, household pipes, secondary water supply facilities, etc. of the water transmission and distribution network, which will consume the residual chlorine at the end of the pipe network and cause adverse effects such as microbial reproduction and sensory decline; 3) The pre-oxidation process inactivates algae cells, which is beneficial to the coagulation process, but under high chlorine dosage, pre-oxidation may also destroy the cell wall structure and cause the release of intracellular substances, which may cause greater water quality risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Eutrophication pollution occurred in the water source of a waterworks, and the concentration of algae cells reached 1.0×10 8 unit / L, the raw water turbidity is 15NTU, and the flocculant used in the water plant is aluminum sulfate. When there is no eutrophication pollution in the water source, the dosage of flocculant is 20mg / 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 30mg / L, and the treatment effect was still unsatisfactory. The efficiency is only 80%, and the filter cycle of the filter is shortened to 12 hours.

[0019] Adopt the method of the present invention to carry out strengthen algae killing to the above-mentioned source water polluted by eutrophication:

[0020] 1) mixing sodium hypochlorite with water to obtain an aqueous solution of sodium hypochlorite; mixing copper sulfate with...

Embodiment 2

[0024] A cyanobacteria bloom broke out in the water source of a water plant, and the concentration of algae cells reached 1.0×10 9 unit / L, the raw water turbidity is 40NTU, and the flocculant used in the water plant is aluminum sulfate. Before the outbreak of water bloom, the flocculant dosage is 20mg / L (calculated as aluminum) to achieve a good removal effect, and the filtration cycle of the filter is 24 hours. However, when water bloom occurs in the water source, the dosage of flocculant is increased to 40mg / L, and the treatment effect is still unsatisfactory. The turbidity of the water after sinking and filtration increases, and the removal rate of algae cells in the sinking water is only 70%. , The filter cycle is shortened to 10 hours.

[0025] Adopt the method of the present invention to carry out strengthen algae killing to the water source that above-mentioned algae bloom takes place:

[0026] 1) Calcium hypochlorite is mixed with water to obtain an aqueous solution ...

Embodiment 3

[0030] Eutrophication pollution occurred in the water source of a water plant, and the concentration of algae cells reached 5.0×10 9 unit / L, the raw water turbidity is 200NTU, and the flocculant used in the water plant is polyaluminum chloride. When eutrophication pollution does not occur, the flocculant dosage is 25mg / L (calculated as aluminum) to achieve a good removal effect, and the filtration cycle is 24 hours. However, after eutrophication pollution occurred, the dosage of flocculant was increased to 50mg / L, and the treatment effect was still unsatisfactory. The turbidity of water after sinking and filtration increased, and the removal rate of algae cells after sinking was only 40%. The filter cycle is shortened to 6 hours.

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

[0032] 1) Mix sodium hypochlorite with water to obtain an aqueous solution of sodium hypochlor...

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Abstract

The invention belongs to the technical field of drinking water treatment and discloses a method for phyisochemical enhanced algae removal. The method includes: aiming at eutrophic water bodies of surface water like lakes and reservoirs, adding copper salt and chlorine at the same time before water plant treatment. Chlorine free radical and chlorine can damage completeness of algae cell walls, and copper ions are facilitated to act on cytoplasm, so that algae cell activity and algae cell breeding amount are inhibited effectively. The method is mainly applied to water source pretreatment of the eutrophic water bodies and can be applied to landscape reserve water treatment targeting at landscape water body recycling.

Description

Technical field: [0001] The invention belongs to the technical field of drinking water treatment, in particular to a method for strengthening algae killing by combining copper salt and chlorine. Background technique: [0002] Due to the discharge of nutrient sources such as nitrogen and phosphorus, many water sources such as rivers, lakes and reservoirs that have the function of drinking water sources show different degrees of eutrophication trends, and may lead to algal blooms under suitable environmental factors, which has become an impact. It is an important hidden danger of water treatment process and drinking water quality safety. [0003] The adverse effects of algae-containing water or high-algae water on drinking water treatment process and drinking water quality safety are mainly as follows: 1) Algae cells are electronegativity and are not easy to destabilize through coagulation, especially for surviving algae cells. Removal by coagulation and sedimentation units m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/50
Inventor 兰华春苗时雨戚菁李建斐刘锐平刘会娟曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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