A method for removing heavy metals in wastewater and improving the quality of bio-oil by using waste biomass

A technology for waste biomass and heavy metals, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of complex operation, serious environmental pollution, low energy conversion rate, etc., and achieve simple operation and energy utilization The effect of high efficiency and huge ecological benefits

Active Publication Date: 2019-04-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These utilization methods have disadvantages such as low energy conver

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dry the waste rice straw, shear and grind it to a size of 180 mesh, take 5g of biomass powder and 25mL of Cu with a concentration of 5mg / L 2+ Mix and stir the polluted wastewater to form a slurry, pour it into a 250mL closed high-pressure reactor, the concentration of heavy metal ions in the wastewater is 10mg / L, raise the temperature to 200°C while stirring, keep it for 120min, pass tap water to cool to room temperature, and pour out the reaction mixture . After the solid-liquid separation of the product, the solid phase product is extracted and filtered with 150mL ethyl acetate, and the liquid phase is decompressed to distill the ethyl acetate liquid phase to obtain bio-oil, and ethyl acetate is recovered at the same time; a certain amount of water phase product is extracted with 150mL ethyl acetate Extraction and separation, the ethyl acetate liquid phase is distilled under reduced pressure to obtain bio-oil, and ethyl acetate is recovered at the same time. The tota...

Embodiment 2

[0017] Dry the discarded pine branches, cut and grind them to a size of 180 mesh, take 5g of biomass powder and 50mL of As with a concentration of 50mg / L 5+ Mix and stir the polluted wastewater to make a slurry, pour it into a 250mL closed high-pressure reactor, the concentration of heavy metal ions in the wastewater is 100mg / L, raise the temperature to 250°C while stirring, keep it for 90min, pass tap water to cool to room temperature, and pour out the reaction mixture . After the solid-liquid separation of the product, the solid phase product is extracted and filtered with 150mL ethyl acetate, and the liquid phase is decompressed to distill the ethyl acetate liquid phase to obtain bio-oil, and ethyl acetate is recovered at the same time; a certain amount of water phase product is extracted with 150mL ethyl acetate Extraction and separation, the ethyl acetate liquid phase is distilled under reduced pressure to obtain bio-oil, and ethyl acetate is recovered at the same time. ...

Embodiment 3

[0019] Dry the green waste willow leaves, cut and grind them to a size of 180 mesh, take 5g of biomass powder and 75mL of Hg with a concentration of 500mg / L 2+ Mix and stir the polluted wastewater to form a slurry, pour it into a 250mL closed high-pressure reactor, the concentration of heavy metal ions in the wastewater is 200mg / L, raise the temperature to 275°C while stirring, keep it for 50min, pass tap water to cool to room temperature, and pour out the reaction mixture . After the solid-liquid separation of the product, the solid phase product is extracted and filtered with 150mL ethyl acetate, and the liquid phase is decompressed to distill the ethyl acetate liquid phase to obtain bio-oil, and ethyl acetate is recovered at the same time; a certain amount of water phase product is extracted with 150mL ethyl acetate Extraction and separation, the ethyl acetate liquid phase is distilled under reduced pressure to obtain bio-oil, and ethyl acetate is recovered at the same time...

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Abstract

The invention relates to a method for removing heavy metal in wastewater by using abandoned biomass and improving the bio-oil quality. The method comprises the following steps that firstly, the abandoned biomass is cleanly washed, dried and smashed to obtain 40 to 180 meshes of biomass power; a mixed system of a water solution of the biomass power and heavy metal pollution with the solid-to-liquid ratio being 1:2-1:20 is poured into a high pressure reactor; stirring is performed, the temperature is raised to 100 to 450 DEG C and is maintained for 5 to 120min, the mixture is fast cooled to the room temperature, and the reaction mixture is collected; the mixture is leached and extracted by an organic solvent, organic phases are separated and filtered, and the organic solvent is removed to obtain the bio-oil. The bio-oil yield reaches 30.25 percent to 58.77 percent (accounting for the dry biological mass), and the heat value reaches 23.15 MJ/kg to 30MJ/k. The method has the advantages that the energy utilization rate is high; the operation is simple; the product separation is convenient; cleanness and no toxicity are realized, and the like. Meanwhile, the metal pollution wastewater is also reasonable and effectively treated; the effects of treating wastes by wastes and changing wastes into valuables are fully achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and new energy, and in particular relates to a method for removing heavy metals in water by using waste biomass and increasing the yield and calorific value of bio-oil by means of its catalysis. Background technique [0002] Abandoned agricultural and forestry biomass includes plant root powder, straw, leaves, wheat husks, feathers, peanut shells and other biomass rich in chitin, chitin and polysaccharides. A large amount of waste biomass is produced in the process of agricultural production every year, from a wide range of sources. Over the years, most of the biomass wastes have been directly incinerated, and because of the poor economy of comprehensive utilization and the low degree of industrialization, there have been regional, seasonal and structural surpluses of biomass, and a large amount of biomass resources have not been utilized, resulting in relatively high waste. Seri...

Claims

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Application Information

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IPC IPC(8): C02F1/28C10G1/00C02F101/20
CPCC02F1/286C02F2101/20C10G1/00C10G1/002C10G1/006C10G1/008C10G2300/1011
Inventor 张士成曹磊昌陈凯绯陈建民
Owner FUDAN UNIV
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