Method for quickly targeted eradication of cyanobacteria bloom in situ by algae-catching micron bubbles

A technology of micro-bubbles and cyanobacteria blooms, applied in chemical instruments and methods, water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems of water blooms that cannot be solved quickly and efficiently, the impact of water environment ecosystems, Long-term cycle and other problems, to achieve the effect of reducing the cost of algae removal, reducing secondary pollution, and good treatment effect

Inactive Publication Date: 2019-08-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to add a large amount of chemical reagents to the water body, the chemical method has treated the cyanobacteria to a certain extent, but at the same time introduced a large amount of chemical reagents into the water body environment, which is likely to cause secondary pollution
The application of biological methods requires a long period of time, which cannot solve the problem of algal blooms quickly and efficiently, and will also affect the ecosystem of the water environment
The physical method of treating cyanobacteria blooms uses filtration and fishing methods to intuitively and obviously remove algae in the water body, but it takes a long time and costs high, and it only works on local water bodies, and cannot fundamentally solve the problem

Method used

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  • Method for quickly targeted eradication of cyanobacteria bloom in situ by algae-catching micron bubbles
  • Method for quickly targeted eradication of cyanobacteria bloom in situ by algae-catching micron bubbles
  • Method for quickly targeted eradication of cyanobacteria bloom in situ by algae-catching micron bubbles

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Experimental program
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Effect test

Embodiment 1

[0037] A method for in-situ rapid target eradication of algae-catching micro-bubbles according to this embodiment comprises the following steps:

[0038] (1) In the algae trapping device, the flow meter is controlled to mix the coagulant and the surfactant cetyltrimethylammonium bromide in a certain proportion to obtain the bubble generation liquid;

[0039] (2) Stir the bubble generating liquid under the condition that the stirring rate is 5000-8000rpm to obtain algae trapping micro-bubbles;

[0040] (3) Use a pump to pass algae-catching micro-bubbles into the water treatment area for rapid and targeted algae removal;

[0041] (4) Start the algae residue collecting device to collect the algae residue floating to the water surface;

[0042] (5) Solid-liquid separation is carried out on the collected algae residue.

[0043] (6) Monitor the treated algae bloom area to see if algae regeneration occurs.

[0044] i. Algae capture micro-bubble air flotation: at OD 680 In the wat...

Embodiment 2

[0050] i. Algae capture micro-bubble air flotation: at OD 680 In the water bloom of 0.260, the 4-CTAB (cetyltrimethylammonium bromide) storage tank, 5-Al 2 (SO 4 ) 3 (Aluminum sulfate) Surfactant (aqueous solution form, concentration 1.0mol / L) and coagulant (aqueous solution form, concentration 0.1mol / L as Al) in the storage tank are added to the 3-bubble generator and mixed to obtain bubble generation liquid (in which the concentration of the coagulant in terms of Al is 0.5mmol / L, and the concentration of the surfactant is 0.1mmol / L), after stirring at a speed of 6000rpm for 90s, the micron bubbles produced are pumped into the 1- Bubble release device, the flow meter controls the flow rate of algae-catching micro-bubbles at 1-4L / min at a ship speed of 1-3m / min and releases them at a depth of 0.10m underwater. After 3 minutes, take a suspension at a depth of 0.10m underwater to measure relevant indicators. The results are shown in the table 2. At the same time, the algae r...

Embodiment 3

[0055] i. Algae capture micro-bubble air flotation: at OD 680 In the water bloom of 0.050, by controlling 8-pumps and 9-flow meters, the surface activity in 4-CTAB (cetyltrimethylammonium bromide) storage tanks and 5-PAS (polyaluminum sulfate) storage tanks is controlled. Agent (aqueous solution form, concentration 1.0mol / L) and coagulant (aqueous solution form, concentration 0.1mol / L as Al) are added in the 3-bubble generator and mixed to obtain bubble generating liquid (wherein the coagulant is calculated as Al The concentration is 0.4mmol / L, the concentration of the surfactant is 0.1mmol / L), after stirring for 90s at a speed of 6000rpm, the micron bubbles produced are pumped into the 1-bubble releaser with a pump, and the boat speed is 1-3m / The flow meter controls the flow rate of algae-catching microbubbles at 1-4L / min and releases them at 0.10m underwater. After 3min, the suspension at 0.10m underwater is taken to measure related indicators. The results are shown in Tabl...

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Abstract

The invention provides a method for rapidly targeted eradication of cyanobacteria bloom in situ by algae-capturing micro-bubbles. In the method, a bubble generating solution prepared by compounding acoagulant and a surfactant for high-speed stirring generates a large number of micro-bubbles. As the surface of the micro-bubbles is positively charged, the micro-bubbles can be firmly combined with negatively charged algae cells through electrostatic force and flocculation in a short time to achieve the aim of targeted removal of cyanobacteria, algae density monitoring is carried out on a treatedbloom area for 8 to 10 days, no risk of water bloom re-eruption is found, and since the method and the device have better treatment effects on water bodies with different algae densities, the methodand the device can be used for treating the water bloom in early warning period, initial period and outbreak period.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of water treatment, and in particular relates to a method for rapidly targeting and eradicating cyanobacteria blooms in situ by using algae-catching micro-bubbles. [0003] (2) Background technology [0004] Currently, blue-green bacteria blooms are causing widespread freshwater blooms. It has been reported that the average time of algal blooms will gradually increase from the current 7 days per year, to about 16-23 days in 2050, and about 18-39 days in 2090. The occurrence of algal blooms has attracted worldwide attention. It not only has a bad impact on the aquatic ecological environment, but also poses a threat to people's health and the water environment. Therefore, be badly in need of a kind of effective method to suppress algae bloom. [0005] At present, common water bloom treatment methods are mainly divided into chemical methods, biological methods and physical methods. Because the chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24C02F1/72C02F1/52C02F1/56
CPCC02F1/24C02F1/5245C02F1/56C02F1/72C02F2303/20
Inventor 张明王亚峰潘响亮张道勇
Owner ZHEJIANG UNIV OF TECH
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