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Preparation method and application of shell-straw-based calcium-rich biochar

A technology of biochar and straw, which is applied in carbon preparation/purification, chemical instruments and methods, water pollutants, etc., can solve the problem of low adsorption capacity of adsorbents

Pending Publication Date: 2021-04-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a preparation method and application of shell-straw-based calcium-enriched biochar in order to solve the technical problem that the adsorption capacity of the existing adsorbents used for phosphorus-containing wastewater treatment and phosphorus recovery in water is not high

Method used

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  • Preparation method and application of shell-straw-based calcium-rich biochar
  • Preparation method and application of shell-straw-based calcium-rich biochar

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Embodiment 1

[0026] Embodiment 1: The preparation method of a shell-straw-based calcium-rich biochar of this embodiment is carried out according to the following steps:

[0027] Step 1. Soak and clean the straw and shells with distilled water, then dry them naturally, pass through a 40-mesh sieve after grinding, and obtain shell powder and straw powder respectively;

[0028] Step 2. Mix 10g of shell powder and 90g of straw powder evenly, then add 150mL of deionized water, and stir for 12h under magnetic stirring at 100rpm to obtain a mixed gel;

[0029] Step 3. Dry the mixed gel at 105°C, then put it into a corundum crucible, place it in a muffle furnace under a nitrogen atmosphere, raise the temperature to 600°C at a heating rate of 5°C / min, and keep it at this temperature 1h for roasting treatment;

[0030] Step 4, after roasting, cool naturally to room temperature, then wash with distilled water until the pH value does not change, then dry at 110°C, grind and pass through a 100-mesh si...

Embodiment 2

[0031] Embodiment 2: The preparation method of a shell-straw-based calcium-rich biochar of this embodiment is carried out according to the following steps:

[0032] Step 1. Soak and clean the straw and shells with distilled water, then dry them naturally, pass through a 40-mesh sieve after grinding, and obtain shell powder and straw powder respectively;

[0033] Step 2: Mix 5g of shell powder and 95g of straw powder evenly, then add 150mL of deionized water, and stir for 12h under magnetic stirring at 100rpm to obtain a mixed gel;

[0034] Step 3. Dry the mixed gel at 105°C, then put it into a corundum crucible, place it in a muffle furnace under a nitrogen atmosphere, raise the temperature to 600°C at a heating rate of 5°C / min, and keep it at this temperature 1h for roasting treatment;

[0035] Step 4, after roasting, cool naturally to room temperature, then wash with distilled water until the pH value does not change, then dry at 110°C, grind and pass through a 100-mesh sie...

Embodiment 3

[0036] Embodiment 3: The preparation method of a shell-straw-based calcium-rich biochar of this embodiment is carried out according to the following steps:

[0037] Step 1. Soak and clean the straw and shells with distilled water, then dry them naturally, pass through a 40-mesh sieve after grinding, and obtain shell powder and straw powder respectively;

[0038] Step 2: Mix 1g of shell powder and 99g of straw powder evenly, then add 150mL of deionized water, and stir for 12h under magnetic stirring at 100rpm to obtain a mixed gel;

[0039] Step 3. Dry the mixed gel at 105°C, then put it into a corundum crucible, place it in a muffle furnace under a nitrogen atmosphere, raise the temperature to 600°C at a heating rate of 5°C / min, and keep it at this temperature 1h for roasting treatment;

[0040] Step 4, after roasting, cool naturally to room temperature, then wash with distilled water until the pH value does not change, then dry at 110°C, grind and pass through a 100-mesh sie...

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Abstract

The invention discloses a preparation method and application of shell-straw-based calcium-rich biochar. The invention belongs to the technical field of phosphorus-containing wastewater treatment and recycling. The invention aims to solve the technical problem of low adsorption capacity of an existing adsorbent for treating phosphorus-containing wastewater and recycling phosphorus in water. The preparation method comprises the following steps: step 1, soaking, cleaning, airing, grinding and sieving straws and shells; step 2, uniformly mixing shell powder and straw powder, adding deionized water, and magnetically stirring to obtain mixed gel; step 3, drying the mixed gel, and then carrying out roasting treatment in a nitrogen atmosphere; and step 4, naturally cooling to the room temperature, cleaning, drying, grinding and sieving to obtain the shell-straw-based calcium-rich biochar. The prepared calcium-rich biochar has a remarkable effect on phosphate adsorption, the adsorption capacity of the adsorbent reaches 102.5 mg / g through Ca-P precipitation, hydrogen bonds and electrostatic attraction, and phosphorus-containing wastewater is effectively treated.

Description

technical field [0001] The invention belongs to the technical field of phosphorus-containing wastewater treatment and resource utilization, and in particular relates to a preparation method and application of shell-straw-based calcium-enriched biochar. Background technique [0002] Phosphorus is a very important basic element in agricultural production and widely exists in various organisms. Phosphorus is a non-renewable resource, and the existing phosphorus resources will be exhausted within 100 years. Nevertheless, there are still a large amount of phosphorus resources flowing into some natural water bodies. The loss of these phosphorus resources not only causes waste of phosphorus resources, but also causes eutrophication of water bodies and endangers the ecological environment. Therefore, the treatment of phosphorus-containing wastewater and the recovery and utilization of phosphorus in water are a topic of great significance. At present, there are biological methods, ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C01B32/05C02F101/10
CPCB01J20/20C02F1/283C01B32/05B01J2220/4825B01J2220/4881C02F2101/105
Inventor 卜凡冯德鑫咸漠
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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