Method and device of treating algae-laden water by hydroxyl radicals

A free radical, high algae water technology, applied in water/sewage treatment, chemical instruments and methods, electrochemical water/sewage treatment, etc.

Active Publication Date: 2015-02-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From May to June 2007, severe cyanobacteria blooms broke out in Taihu Lake, Jiangsu, causing the water supply in Wuxi city to turn into stinky water almost overnight, resulting in serious consequences of water shortage in the entire city and difficulty in drinking water for millions of people
The main problems are: the time to kill algae is 20-120mins, the required dosage is large, and disinfection by-products such as halogenated substances are generated, and it is impossible to oxidize and degrade harmful and toxic organic pollutants such as algae toxins and smell-causing substances; CuSO 4 It is toxic and remains in the water for a long time; the ozone disinfection equipment is complex, with large investment, large power consumption and high operating costs
[0007] At present, high-algae water treatment is mostly used for the removal of algae in eutrophic water bodies, which requires a long treatment time and complicated treatment process, and is not suitable for large-scale and rapid treatment of high-algae source water

Method used

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  • Method and device of treating algae-laden water by hydroxyl radicals
  • Method and device of treating algae-laden water by hydroxyl radicals
  • Method and device of treating algae-laden water by hydroxyl radicals

Examples

Experimental program
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Effect test

Embodiment 1

[0058] As shown in Table 1, the test water comes from Tingxi Reservoir in Xiamen City, the water temperature is 28-30 ° C, the treatment capacity of the OH strong oxidation treatment system is 50 tons per hour, and different concentrations of Microcystis aeruginosa (Microcystis aeruginosa), Synedra sp. and Scenedesmus quadricauda were added to the reservoir water, and the concentration of algae was 40×10 4 , 20×10 4 , 10×10 4 , 1×10 4 Prototheca cells / mL. The processed samples were passed through the nucleic acid dye Green staining and observation with a fluorescence microscope to determine whether the algal cells are dead or alive. When the plasma membrane is damaged, the dye can enter the cell and bind to the cell DNA, and the nucleic acid emits green fluorescence under the excitation light of 488nm; for living cells, the dye cannot penetrate the cell membrane. Nucleic acids do not fluoresce under excitation light.

[0059] Table 1. Killing effect of hydroxyl radicals ...

Embodiment 2

[0066] Energy consumption test of hydroxyl radical solution preparation device.

[0067] The amount of OH generated by the hydroxyl radical generator is 25 to 50 m 3 / h, the total flow of water to be treated in the main pipeline is 400~500m 3 / h. Externally commissioned Dalian Energy Saving Technology Service Center to test the energy consumption of OH generators and the production of hydroxyl solution, and the Modern Analysis Center of Dalian Institute of Chemical Physics, Chinese Academy of Sciences to test the concentration of total oxidant (TRO) to calculate the energy consumption per ton of water treated and cost. The test results are shown in Table 3.

[0068] Energy consumption of OH generating device: power quality analyzer (model: FLUKE 435-II, accuracy level 0.5), detect voltage, current, power factor and electric energy at the power input terminal of OH device.

[0069] ·OH solution generation: intelligent electromagnetic flowmeter (model: LDBE-80, precision grad...

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Abstract

The invention discloses a method and device of treating algae-laden water by hydroxyl radicals. The method comprises the following steps: starting a power supply, introducing a raw material gas to a modularized array type oxygen plasma generating source to perform ionization and dissociation so as to generate an oxygen plasma gas, and introducing one part of the oxygen plasma gas into an oxygen plasma gas concentration detector from an outlet of the modularized array type oxygen plasma generating source, and then introducing the balance of the oxygen plasma gas to a high-pressure ejector; pumping to-be-treated algae-laden water into a filter, introducing part of the water that passes through the filter into a high-pressure jet gas-liquid mixer to mix with the oxygen plasma gas entering the high-pressure jet gas-liquid mixer to obtain a mixture, then, introducing the mixture into a liquid-liquid mixer to further mix, and thermally decomposing the oxygen plasma gas which is not dissolved in water into O2 by virtue of a gas-liquid separator and a residual gas eliminator to exhaust; and conveying part of outlet water that passes through the filter to the liquid-liquid mixer in a main pipeline to mix with a hydroxyl radical solution conveyed by a branch pipeline, and decomposing the residual .OH into O2 and H2O.

Description

technical field [0001] The invention belongs to the technical fields of gas discharge science, free radical biology and water treatment application, and in particular relates to a method and a device for treating high-algae water by hydroxyl radicals. Background technique [0002] At present, 75% of the lakes in the country are experiencing eutrophication to varying degrees. The famous Taihu Lake, Chaohu Lake, Dianchi Lake, East Lake and Dongting Lake, which were originally beautiful and pleasant lake waterscapes, have been reduced to inferior Class V surface water in the past 20 years. From May to June 2007, a severe algae bloom broke out in Taihu Lake, Jiangsu Province, causing the water supply of Wuxi city to turn into stinky water almost overnight, resulting in severe consequences of water supply cutoff for the entire city and difficulty in drinking water for millions of people. Chaohu Lake is a backup water source for drinking water in Hefei City. It is a eutrophic wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46
CPCC02F1/4606C02F2103/007
Inventor 白敏冬张芝涛田一平白敏菂郑琦琳李海燕
Owner XIAMEN UNIV
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