A method for removing heavy metals by biochar-based microalgae composite adsorbent

A composite adsorption and biochar technology, applied in the field of water pollution control, can solve the problems of secondary environmental pollution by sediments and toxic compounds, insignificant water source effect, and high operating costs, achieve good adsorption effect, extensive removal and recovery, and improve The effect of adsorption rate

Inactive Publication Date: 2018-08-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional heavy metal remediation methods include physical remediation, chemical remediation, and phytoremediation for heavy metals in soil, and chemical reduction, precipitation, ion exchange, solvent extraction, chelation, and membrane filtration for heavy metal-contaminated water sources. However, these methods generally have high operating costs and low economic efficiency. They are not effective in treating water sources with low heavy metal concentrations (0-100mg / L) such as paddy field water, are difficult to put into practical use, and are prone to produce sediment and toxic compounds. cause secondary environmental pollution

Method used

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  • A method for removing heavy metals by biochar-based microalgae composite adsorbent
  • A method for removing heavy metals by biochar-based microalgae composite adsorbent
  • A method for removing heavy metals by biochar-based microalgae composite adsorbent

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Experimental program
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Effect test

Embodiment 1

[0041] (1) After pulverizing the stems and leaves of sun-dried water hyacinth, pyrolyze 210S at a pyrolysis power of 1100W and a pyrolysis temperature of 500℃. After cooling to room temperature, grind and sieve to obtain biochar with a particle size of 3mm. Take 0.1g for single adsorption and 0.02g for mixed adsorption with microalgae; dry it in an oven at 105°C for 24 hours for use;

[0042] (2) The algae species are selected from the freshwater algae species bank of the Institute of Hydrobiology, Chinese Academy of Sciences Scenedesmus dimorphus ,,Cultivation light intensity 120 µmol photons / m 2 / s, pH is 7, temperature is 26 5℃, after 8 days of culture, the biomass concentration DW2 in the stock solution of microalgae is 0.82 g / L, and the volume of algae solution is 122ml (corresponding to the quality of microalgae is 0.1g). The volume of 97ml (corresponding to the mass of microalgae is 0.08g) is mixed with biochar to form a mixed adsorbent of 0.1g;

[0043] (3) Add 0.02g of bi...

Embodiment 2

[0050] (1) After taking sun-dried rice husks and pulverizing, cracking 210S under the working conditions of cracking power of 800W and cracking temperature of 600°C, after cooling to room temperature, grinding and sieving to obtain biochar with a particle size of 2mm, respectively 0.1g Used for single adsorption (0.1BC), take 0.06g for single adsorption (0.06BC) and mixed adsorption of microalgae; dry in an oven at 105°C for 24 hours for use;

[0051] (2) Chlorella selected from the freshwater algae species bank of the Institute of Hydrobiology, Chinese Academy of Sciences Chlorella vugaris , The cultivation light intensity is 200 µmol photons / m 2 / s, pH is 8, temperature is 26 5 ℃, after 16 days of culture, the biomass concentration DW2 in the stock solution of microalgae is 1.5 g / L, and the volume of algae solution is 66ml (corresponding to the mass of microalgae is 0.1g) for adsorption and 26ml (corresponding to the microalgae mass is 0.04g) separate adsorption and biochar fo...

Embodiment 3

[0057] (1) After pulverizing the stems and leaves of sun-dried water hyacinth, the pyrolysis power is 1100W and the pyrolysis temperature is 500℃. After cooling to room temperature, it is ground and sieved to obtain biochar of different particle sizes (1mm, 3mm, 5mm), take 0.02g for mixed adsorption with microalgae; dry it in an oven at 105°C for 24 hours for use;

[0058] (2) Chlorella selected from the freshwater algae species bank of the Institute of Hydrobiology, Chinese Academy of Sciences Chlorella vugaris , The cultivation light intensity is 120 µmol photons / m 2 / s, pH is 7, temperature is 26 5 ℃, the biomass concentration DW2 in microalgae stock solution is 1 g / L after 10 days of culture, and the volume of algae solution is 100ml (corresponding to the microalgae mass is 0.1g) and 80ml ( The corresponding microalgae mass is 0.08g) mixed with biochar;

[0059] (3) Add 0.02g of biochar of various particle sizes (1mm, 3mm, 5mm) to 80ml of algae, mix with a turbo shaker, shake...

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Abstract

The invention provides a heavy metal removing method using biochar as the substrate material and fixing microalgae to the biochar carrier to form a composite absorbent. The method is characterized in that extracellular polymeric substances secreted by the microalgae under an inhibition condition are used as the binder, and micro-grade algae cells are attached to the surfaces of the multiple pores of the biochar to form the composite absorbent; the composite absorbent utilizes the advantage that the biochar can absorb the heavy metals fast and uses the live algae cells to absorb the heavy metals through metabolism in a long-term and effective manner so as to increase the absorption effect on water with high-concentration heavy metals. Accordingly, the method is high in heavy metal removing rate, easy in recycling and low in application cost.

Description

Technical field [0001] The invention relates to the field of water pollution control, and in particular to a method for removing heavy metals from a biochar-based microalgae composite adsorbent. Background technique [0002] Traditional heavy metal remediation methods include physical remediation, chemical remediation, phytoremediation, etc. for heavy metals in the soil, and chemical reduction, precipitation, ion exchange, solvent extraction, chelation, and membrane filtration for heavy metal polluted water sources. However, these methods generally have high operating costs and low economic efficiency. They have no obvious effect on the treatment of water sources with low heavy metal concentrations (0-100mg / L) such as rice field water, and are difficult to put into practical use, and are easy to produce sediments and toxic compounds. Cause secondary environmental pollution. [0003] Biochar is a new type of carbon-containing, stable, and highly aromatized new environmental functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24C02F1/28B09C1/00B09C1/08C02F101/20
CPCB01J20/20B01J20/24B09C1/00B09C1/08B09C1/105C02F1/288C02F2101/20
Inventor 沈英朱雯喆王莎陈剑峰谢友坪
Owner FUZHOU UNIV
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