Method for removing harmful algae in water body by adopting electro-Fenton

A water body and algae technology, applied in chemical instruments and methods, water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as time-consuming, low current efficiency, secondary pollution, etc., to avoid flocculation and precipitation, and reduce reaction time shortening, stable effect

Inactive Publication Date: 2011-02-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the problems of non-renewable ferrous ions in the traditional Fenton reaction and easy to produce a large amount of flocculation and precipitation, as well as the problems of low current efficiency, time-consuming and secondary pollution of traditional electrolytic algae removal, the present invention combines the above two methods, through Appropriate process flow and parameter control of the process to achieve rapid removal of algae pollution

Method used

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  • Method for removing harmful algae in water body by adopting electro-Fenton
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Examples

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Embodiment 1

[0022] Taking the treatment of high-concentration Microcystis aeruginosa liquid as an example, the process flow is as follows: figure 1 shown. The volume of algal liquid to be treated is 1.0 L, and the current density is 3.0 mA / cm 2 , the rotor speed is 200 r / min, and the initial cell density of algae liquid is 2.25×10 6 Individuals / mL, the concentration of ferrous sulfate is 1.0 mM, the concentration of hydrogen peroxide is 20.0 mM, and sodium sulfate is 50.0 mM as the electrolyte. The pH value is adjusted to 4.0 with dilute sulfuric acid. After electrolysis for 30 min, the effluent algae liquid becomes transparent and the algae cells are basically completely broken. removed, the algae cell density drops to 2.45×10 3 / mL, the removal rate reached 100%.

Embodiment 2

[0024] Taking the treatment of high-concentration Microcystis aeruginosa liquid as an example, the process flow is as follows: figure 1 shown. The volume of algal liquid to be treated is 1.0 L, and the current density is 3.0 mA / cm 2 , the rotor speed is 150 r / min, and the initial cell density of algae liquid is 2.25×10 6 A / mL, the concentration of ferrous sulfate is 1.5 mM, the concentration of hydrogen peroxide is 18.0 mM, and sodium sulfate is 55.0 mM as the electrolyte. The pH value is adjusted to 5.0 with dilute sulfuric acid. After electrolysis for 30 min, the effluent algae liquid becomes transparent and the algae cells are basically completely broken. removed, the algae cell density drops to 3.2×10 3 / mL, the removal rate was 100%.

Embodiment 3

[0026] Taking the treatment of high-concentration Microcystis aeruginosa liquid as an example, the process flow is as follows: figure 1 shown. The volume of algal liquid to be treated is 1.0 L, and the current density is 3.0 mA / cm 2 , the rotor speed was 200 r / min, the total amount of microcystin MCLR (intracellular and extracellular) in the initial algae fluid was 110.0 μg / L, the concentration of ferrous sulfate was 0.8 mM, the concentration of hydrogen peroxide was 25.0 mM, and sodium sulfate was 45.0 mM as The electrolyte was adjusted to pH 4.0 with dilute sulfuric acid and electrolyzed for 60 min. The total amount of microcystin MCLR in the effluent was about 13.0 μg / L, and the removal rate reached 88.2%.

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Abstract

The invention belongs to the technical field of environmental protection and in particular relates to a method for removing harmful algae pollution in water body by adopting electro-Fenton. Hydrogen peroxide and ferrous ions in a reactor react to generate hydroxyl radicals, at the same time, the ferrous ions are regenerated from iron ions and iron hydroxide in the cathode region for electrolysis through reduction, thus continuously generating vast hydroxyl radicals, efficiently inactivating algae cells, simultaneously rapidly carrying out oxidation degradation on the microcystins and effectively avoiding secondary pollution. The body part of the reactor comprises a power source, electrodes, an electrolytic bath and a magnetic stirrer. After the algae liquid to be treated is introduced to the electrolytic bath, the magnetic stirrer at the bottom of the electrolytic bath is used for ensuring the algae liquid to be uniformly distributed in the whole reactor. Under the set process parameters, the method can realize rapid inactivation of the harmful algae and simultaneously realize efficient degradation of the microcystins.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing harmful algal pollution in a water body by using an electric Fenton. Background technique [0002] In recent years, water eutrophication has become a hot environmental issue of global concern. Eutrophication directly leads to the massive growth of algae, resulting in the "bloom" phenomenon. The outbreak of algal blooms leads to a drop in dissolved oxygen in the water body, turbidity in the water body, blockage of water treatment pipelines, and serious damage to water treatment equipment. At the same time, some algae that produce "algae blooms" will produce toxins (Environmental Science and Technology, 2005, 28: 46~47). Among them, freshwater blue-green algae ( Cyanobacteria , Blue-green Algae) secreted Microcystin-LR (MCLR) is the most toxic and acutely harmful freshwater algae toxin. MCLR is a hepatotoxin and the strongest liver tumo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/461C02F1/58
Inventor 王祥荣任晶樊正球
Owner FUDAN UNIV
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