Hydrothermal method lanthanum modified constructed wetland biochar matrix and preparation method thereof

A technology of biochar matrix and constructed wetland, applied in the direction of water pollutants, chemical instruments and methods, and other chemical processes, can solve the problems of weak combination, uneven load, and many operating steps, so as to promote the recycling of resources , Optimize the effect of phosphorus removal, and the effect of simple process

Active Publication Date: 2021-01-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing lanthanum loading method is prone to problems such as weak bonding and uneven loading, and there are many operating steps, so it cannot be synthesized in one step.

Method used

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  • Hydrothermal method lanthanum modified constructed wetland biochar matrix and preparation method thereof
  • Hydrothermal method lanthanum modified constructed wetland biochar matrix and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Disclosed is a preparation method of a hydrothermal lanthanum-modified constructed wetland biochar substrate, comprising:

[0034] (1) Dry the stalk of the wetland plant reed, wash it, dry it, cut it into small pieces of 1-2cm, put it in a hydrothermal reaction kettle, add ammonia water with a mass ratio of 1:0.3, and the mass ratio is 1: 0.1 lanthanum element, pure water with a mass ratio of 1:10.

[0035] (2) The reaction system of step (1) is subjected to hydrothermal carbonization treatment in an oxygen-limited environment, the reaction temperature is 240 ° C, and the reaction time is 10 hours. After the reaction is completed, filter and separate the precipitate, wash with deionized water, and Dry at 75°C to constant weight to obtain lanthanum-loaded wetland plant biochar.

Embodiment 2

[0037] Disclosed is a preparation method of a hydrothermal lanthanum-modified constructed wetland biochar substrate, comprising:

[0038] (1) Dry the stalk of the wetland plant reed, wash it, dry it, cut it into small pieces of 1-2cm, put it in a hydrothermal reaction kettle, add ammonia water with a mass ratio of 1:0.6, and the mass ratio is 1: 0.1 lanthanum, pure water with a mass ratio of 1:10.

[0039] (2) The reaction system of step (1) is subjected to hydrothermal carbonization treatment in an oxygen-limited environment, the reaction temperature is 240 ° C, and the reaction time is 10 hours. After the reaction is completed, filter and separate the precipitate, wash with deionized water, and Dry at 75°C to constant weight to obtain lanthanum-loaded wetland plant biochar.

Embodiment 3

[0041] Disclosed is a preparation method of a hydrothermal lanthanum-modified constructed wetland biochar substrate, comprising:

[0042] (1) Dry the stalk of the wetland plant reed, wash it, dry it, cut it into small pieces of 1-2cm, put it in a hydrothermal reaction kettle, add ammonia water with a mass ratio of 1:1, and the mass ratio is 1: 0.1 lanthanum, pure water with a mass ratio of 1:10.

[0043] (2) The reaction system of step (1) is subjected to hydrothermal carbonization treatment in an oxygen-limited environment, the reaction temperature is 240 ° C, and the reaction time is 10 hours. After the reaction is completed, filter and separate the precipitate, wash with deionized water, and Dry at 75°C to constant weight to obtain lanthanum-loaded wetland plant biochar.

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Abstract

The invention discloses a hydrothermal method lanthanum modified constructed wetland biochar matrix and a preparation method thereof. The preparation method comprises the following steps: airing, cleaning, drying and chopping straws of wetland plants, putting the chopped straws into a hydrothermal reaction kettle, and adding a mixed aqueous solution of ammonia water and lanthanum chloride; carrying out hydrothermal carbonization treatment on the hydrothermal reaction kettle in an oxygen-limited environment; and after the hydrothermal carbonization treatment reaction is finished, filtering andseparating precipitates, washing with deionized water, and drying to constant weight to obtain the hydrothermal method lanthanum modified constructed wetland biochar which is used as a constructed wetland matrix.

Description

technical field [0001] The disclosure belongs to the technical field of sewage treatment and waste plant recycling, and in particular relates to a hydrothermal lanthanum-modified constructed wetland biochar matrix and a preparation method thereof. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The problem of eutrophication in water bodies is becoming more and more common and intensified. The so-called eutrophication refers to the phenomenon of water quality pollution caused by excessive nitrogen, phosphorus and other plant nutrients in lakes, rivers, reservoirs and other water bodies. As a limiting nutrient element in eutrophic water bodies, the removal of phosphorus has always been a key issue that needs to be studied. The eutrophication concentration of phosphorus (>0.01~0.02ppm) is far lower than the standard concentration of sewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F1/28B01J20/20B01J20/30C02F101/10
CPCC02F3/28C02F1/283B01J20/20B01J20/0207C02F1/281C02F2305/06C02F2101/105
Inventor 胡振尚振欣王玉茹张建梁爽
Owner SHANDONG UNIV
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