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Method using biochar-based microalgae composite absorbent to remove heavy metals

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: 2016-11-09
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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  • Method using biochar-based microalgae composite absorbent to remove heavy metals

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) After crushing the stems and leaves of sun-dried water hyacinth, crack them for 210 seconds under the conditions of cracking power of 1100W and cracking temperature of 500°C. After cooling to room temperature, grind and sieve to obtain biochar with a particle size of 3mm. Take 0.1g for separate adsorption and 0.02g for mixed adsorption with microalgae; dry in an oven at 105°C for 24 hours for later use;

[0042] (2) The algae species were selected from the freshwater algae species bank of the Institute of Hydrobiology, Chinese Academy of Sciences Scenedesmus dimorphus ,, culture light intensity 120 µmol photons / m 2 / s, pH is 7, temperature is 26 After culturing at 5°C for 8 days, the biomass concentration DW2 in the microalgae stock solution was measured to be 0.82 g / L. The volume of the algae solution was 122ml (corresponding to the mass of the microalgae being 0.1g), and the volume of the algae solution was 97ml (corresponding to the mass of the microalgae bein...

Embodiment 2

[0050] (1) Take sun-dried rice husks and crush them, then crack them for 210 seconds under the conditions of cracking power of 800W and cracking temperature of 600°C. After cooling to room temperature, grind and sieve to obtain biochar with a particle size of 2mm. Take 0.1g respectively 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 later use;

[0051] (2) The algae species are Chlorella from the Freshwater Algae Species Bank of the Institute of Hydrobiology, Chinese Academy of Sciences Chlorella vugaris , culture light intensity 200 µmol photons / m 2 / s, pH is 8, temperature is 26 5°C, after 16 days of culture, the biomass concentration DW2 in the microalgae stock solution was measured to be 1.5 g / L, and the volume of the algae liquid was 66ml (corresponding to the mass of the microalgae being 0.1g) for separate adsorption and 26ml (corresponding to the mass of the microal...

Embodiment 3

[0057] (1) After the stems and leaves of dried water hyacinth were crushed, they were cracked for 210 seconds at a cracking power of 1100W and a cracking temperature of 500°C. After cooling to room temperature, they were ground and sieved to produce biochar with different particle sizes (1mm, 3mm, 5mm), take 0.02g for mixed adsorption with microalgae; dry in an oven at 105°C for 24 hours for later use;

[0058] (2) The algae species are Chlorella from the Freshwater Algae Species Bank of the Institute of Hydrobiology, Chinese Academy of Sciences Chlorella vugaris , culture light intensity 120 µmol photons / m 2 / s, pH is 7, temperature is 26 After 10 days of culture at 5°C, the biomass concentration DW2 in the microalgae stock solution was measured to be 1 g / L. Take 100ml of the algae liquid (corresponding to 0.1g of microalgae mass) and 80ml (corresponding to 0.08g of microalgae mass) with the biological charcoal for mixing;

[0059] (3) Add 0.02g of biochar of various par...

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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, in particular to a method for removing heavy metals by a biochar-based microalgae composite adsorbent. Background technique [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. [0003] Biochar is a kind of carbon-containing, stable and highly aromatized new environmental functional material obtained ...

Claims

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Application Information

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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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