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Method of using nitrogen-doped titanium dioxide to enhance algae coagulation while degrading algae-containing sediment under visible light

A sediment and algae technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as increasing the burden of the treatment process, reducing the algae removal efficiency, affecting human health, etc., to avoid problems such as Heavy metal pollution, small environmental impact, and the effect of reducing the content of heavy metals

Active Publication Date: 2020-05-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because algae have a certain degree of buoyancy, the flocs produced by it are not easy to settle, which reduces the removal efficiency of algae and increases the burden of subsequent treatment processes.
In addition, some harmful algae, such as Microcystisaeruginosa, can release microcystins and affect human health in the algal cells that have settled into the bottom mud
When discharging muddy water containing algae toxins, it will cause secondary pollution of the water body

Method used

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  • Method of using nitrogen-doped titanium dioxide to enhance algae coagulation while degrading algae-containing sediment under visible light
  • Method of using nitrogen-doped titanium dioxide to enhance algae coagulation while degrading algae-containing sediment under visible light
  • Method of using nitrogen-doped titanium dioxide to enhance algae coagulation while degrading algae-containing sediment under visible light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The algae-removing coagulant consists of the following components by weight: 50 parts by weight of N-TiO 2 powder (particle size 100 mesh) and 7.5 parts by weight of polyaluminum ferric chloride.

[0053] The Microcystis aeruginosa (Microcystisaeruginosa) used in the experiment was cultured in BG11 medium at a temperature of 25°C, 12 hours of light, 12 hours of darkness, and a light intensity of 2000 lux. It was cultivated to the logarithmic growth stage and used to prepare water sources containing algae for experiments.

[0054] Dilute the algae solution to 1×10 with deionized water 6 cells / mL, prepared as an experimental water source, the volume of the treated water sample is 1L, and the N-TiO 2 Mix 50 mg of powder and 7.5 mg of polyaluminum ferric chloride into each liter of experimental water source, stir at 250 rpm for 1 min, and stir at 30 rpm for 30 min to complete the coagulation process. During the coagulation process and within 2 hours after the completion o...

Embodiment 2

[0057] The algae-removing coagulant is composed of the following components by weight: 100 parts by weight of N-TiO 2 powder (particle size 100 mesh) and 7.5 parts by weight of polyaluminum ferric chloride.

[0058] The Microcystis aeruginosa (Microcystisaeruginosa) used in the experiment was cultured in BG11 medium at a temperature of 25°C, 12 hours of light, 12 hours of darkness, and a light intensity of 2000 lux. It was cultivated to the logarithmic growth stage and used to prepare water sources containing algae for experiments.

[0059] Dilute the algae solution to 1×10 with deionized water 6 cells / mL, prepared as an experimental water source, the volume of the treated water sample is 1L, and the N-TiO 2 Mix 100mg of powder and 7.5mg of polyaluminum ferric chloride into each liter of experimental water source, stir at 250rpm for 1min, and stir at 30rpm for 30min to complete the coagulation process. During the coagulation process and within 2 hours after the completion of...

Embodiment 3

[0062] The algae-removing coagulant consists of the following components by weight: 200 parts by weight of N-TiO 2 powder (particle size 100 mesh) and 7.5 parts by weight of polyaluminum ferric chloride.

[0063] The Microcystis aeruginosa (Microcystisaeruginosa) used in the experiment was cultured in BG11 medium at a temperature of 25°C, 12 hours of light, 12 hours of darkness, and a light intensity of 2000 lux. It was cultivated to the logarithmic growth stage and used to prepare water sources containing algae for experiments.

[0064] Dilute the algae solution to 1×10 with deionized water 6 cells / mL, prepared as an experimental water source, the volume of the treated water sample is 1L, and the N-TiO 2 Mix 200mg of powder and 7.5mg of polyaluminum ferric chloride into each liter of experimental water source, stir at 250rpm for 1min, and stir at 30rpm for 30min to complete the coagulation process. During the coagulation process and within 2 hours after the completion of th...

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Abstract

A method for enhancing algae coagulation using nitrogen-doped titanium dioxide and degrading algae-containing sediment in visible light simultaneously, comprising: (1) adding an algae-removing coagulant to the algae-containing water for stirring to complete coagulation, the algae-removing coagulant consisting of 50-400 parts by weight of N-TiO2 powder and 7.5 parts by weight of polyaluminum ferric chloride; (2) removing the algae in the supernatant after static sedimentation is conducted and algae-containing floc subsides to bottom; and (3) discarding the supernatant, keeping the algae-containing sediment at the bottom, and placing the algae-containing sediment in the visible light for irradiating and stirring, and after a certain time, degrading the algae and algal toxins. The method can reduce the usage amount of coagulant to enhance the coagulation effect and can degrade the algae and microcystic toxins in the sediment, and is applicable to treat water source of high algae density and sediment of high algal density.

Description

technical field [0001] The invention relates to the field of drinking water treatment, in particular to a nitrogen-doped titanium dioxide (N-TiO 2 ) A method for strengthening algae coagulation and simultaneously degrading algae-containing bottom sludge under visible light. Background technique [0002] In recent years, the phenomenon of eutrophication in freshwater lakes and reservoirs in my country has become increasingly serious, and algal blooms have formed in large numbers, which seriously affect the quality of raw water. The mass reproduction of algae changes the physical and chemical environment of the water body, reduces the transparency, emits a fishy smell, and reduces the dissolved oxygen, which not only affects the ecosystem of the aquaculture water area, water supply, tourism and ecological landscape, but also seriously interferes with the normal life of human beings. [0003] In the drinking water process, the removal of algae mainly depends on the coagulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F11/00
CPCC02F1/5236C02F11/00C02F2103/007
Inventor 裴海燕金岩张莎莎
Owner SHANDONG UNIV
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