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Method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation

A hydraulic cavitation and micro-bubble technology, applied in the field of water treatment, can solve problems such as filter bed blockage, affecting water quality of water purification plants, and increased coagulant consumption

Inactive Publication Date: 2014-05-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low density of algae and poor sedimentation effect, it brings many hazards to the drinking water treatment using lakes and reservoirs as water sources [5]. When algae multiply extremely, even if the dosage of coagulant, coagulant and disinfectant is increased, the drinking water quality cannot meet the standard[6]. A major issue facing
Coagulation is the basic unit operation of water treatment, which can remove algae well, but the consumption of coagulant is greatly increased, which causes adverse consequences such as increased costs and increased by-products
[0004]Hydraulic cavitation technology has the advantages of high efficiency, cleanliness, and economy, and it must have broad application prospects in the field of algae removal. Research on algae removal, and there is no application of combining hydraulic cavitation technology with the existing process of the water plant

Method used

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  • Method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation
  • Method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation
  • Method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 (hydraulic cavitation directly removes algae)

[0026] The implementation steps of this embodiment:

[0027] (1) First prepare a device for generating microbubbles using a gas-liquid mixing pump.

[0028] (2) Add algal liquid with an algae density of about 2×109 cel / L into the water tank, turn on the device, and act for 10 minutes, then place the treated algae liquid and the blank control group without hydrodynamic cavitation into light The incubator is normally cultivated, the density of algae is measured every 12 hours, and the chlorophyll content is measured once a day.

[0029] After the microbubble hydraulic cavitation treatment, the algae density continued to decrease during the 72-hour observation period. After 72 hours, the algae density was only 7.3% of the original, and the removal rate was as high as 92.7%. Without hydrocavitation The algae density of the control algae liquid did not change substantially.

[0030]

Embodiment 2

[0031] Example 2 (hydraulic cavitation enhanced coagulation algae removal)

[0032] The implementation steps of this embodiment:

[0033] (1) First prepare a device for generating microbubbles using a gas-liquid mixing pump.

[0034] (2) Add algae liquid with an algae density of about 2×109 cel / L into the water tank, turn on the device, and act for a certain period of time, and then conduct coagulation and sedimentation experiments on the treated algae liquid and the blank control algae liquid respectively. Polyaluminum chloride (PAC) is selected, and the dosage is 0mg / L, 1mg / l, 2mg / L, 3mg / L, 5mg / L respectively. Coagulation conditions: rapid stirring at 150r·min-1 for 2min, slow stirring at 50r·min-1 for 10min, after 30min of static settling, sampling at 2cm below the liquid surface and determination of algae density.

[0035] In order to obtain the best working condition of hydraulic cavitation enhanced coagulation, the single factor variable method was adopted to examine t...

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Abstract

The invention relates to a method for removing blue-green algae by using microbubble hydrodynamic cavitation enhanced coagulation. The method comprises the following steps: (1) selecting a universal microbubble hydrodynamic cavitation generation device; (2) putting algae liquid into a water tank of the microbubble hydrodynamic cavitation generation device, starting a water pump to produce a hydrodynamic cavitation effect, breaking cell walls through a mechanical effect and a heating effect based on hydrodynamic cavitation, killing fronds, and degrading intracellular and extracellular secreta through superstrong oxidization, thus realizing the purification of water; (3) after hydrodynamic cavitation pretreatment, carrying out coagulation so as to achieve a hydrodynamic cavitation enhanced coagulation effect. The invention discloses the method for removing algae by using a microbubble hydrodynamic cavitation technology for the first time. Compared with other algae removal methods such as a chemical agent method, the method is relatively high-efficient and clean; according to the method, the hydrodynamic cavitation technology and coagulation sedimentation are combined so as to improve algae removal efficiency and reduce the dosage of a coagulant.

Description

Technical field: [0001] The invention belongs to the technical field of water treatment, and relates to a method for removing blue-green algae in eutrophic water bodies by utilizing mechanical effects, thermal effects, free radical effects and the like generated in a hydraulic cavitation process. Background technique [0002] Hydrodynamic cavitation is a physical phenomenon that occurs when fluid flows through a constriction device such as a geometric orifice [1]. When the liquid flows through the orifice plate or other cavitators, due to throttling, the flow rate increases sharply and the pressure drops sharply. When the pressure drops to the cavitation incipient pressure (generally the saturated vapor pressure at the corresponding temperature), it will A large number of cavitation microbubbles [2]. When the microbubbles flow with the liquid, when the surrounding pressure increases, the volume will shrink or collapse sharply. The collapse process occurs in an instant (micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 李攀宋源于水利
Owner TONGJI UNIV
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