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Method for preparing biochar from bottom mud and garden waste and application of biochar

A technology of garden waste and biochar, applied in the direction of chemical instruments and methods, biofuels, water pollutants, etc., can solve the problems of reducing water environment maintenance costs, difficult disposal of sediment and garden waste, and reducing the amount of plant fertilization, etc., to achieve Avoiding large-scale occupation of land, realizing resource utilization, and avoiding the effect of eutrophication

Active Publication Date: 2021-07-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochar prepared by the invention can effectively absorb nitrogen and phosphorus in the water body, and provide nutrients to plants in situ, reduce the amount of fertilization of plants, realize waste recycling, and simultaneously solve the problem of difficult disposal of sediment and garden waste and high phosphorus concentration in water bodies problems, forming a virtuous cycle of various substances in the water environment, which greatly reduces the maintenance cost of the water environment

Method used

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  • Method for preparing biochar from bottom mud and garden waste and application of biochar
  • Method for preparing biochar from bottom mud and garden waste and application of biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 A kind of method utilizing bottom mud and garden waste to prepare biochar

[0054] 1. Preparation method

[0055] S1. Clean up and dry the bottom mud and the plant residue produced by Zhu Jin, and crush it to 60 mesh;

[0056] S2. According to the mass ratio of 1:2, take 10g of bottom mud and 20g of plant residues produced by Zhu Jin, add 100mL of water, mix them evenly with a shaker at 25°C and a speed of 60r / min for 3h, and then dry at 105°C dry to obtain mixture A;

[0057] S3. Pyrolyzing the mixture A at 450° C. in an environment with an oxygen concentration lower than 4% for 3 hours to obtain a mixture B;

[0058] S4. With FeCl 3 As a modifier, take the modifier at a mass ratio of 1:10 to the mixture A, and then add 50 mL of water to the mixture B obtained in step S3 and shake it with a shaker at a speed of 60 r / min for 3 h at 25 ° C. After mixing evenly, dry at 105° C. to obtain the biochar.

[0059] 2. Use effect

[0060] Add 0.05g of the prepa...

Embodiment 2

[0063] Embodiment 2 A kind of method utilizing bottom mud and garden waste to prepare biochar

[0064] 1. Preparation method

[0065] With the method of embodiment 1, the difference is that NaOH is used as modifier.

[0066] 2. Use effect

[0067] Add 0.05g of the prepared biochar to 200mL of NH (ammonia nitrogen) wastewater with a concentration of 6mg / L, the adsorption capacity of NH is 9.92mg / g 生物炭 , the removal rate was 41.33%; adding 0.5g of the prepared biochar to 200mL of NH wastewater with a concentration of 80mg / L, the adsorption capacity of NH was 13.72mg / g 生物炭 , and the removal rate was 42.89%.

Embodiment 3

[0068] Embodiment 3 A kind of method that utilizes bottom mud and garden garbage to prepare biochar

[0069] 1. Preparation method

[0070] The method is the same as in Example 1, the difference is that bamboo is used instead of Zhu Jin, and the modifier is taken at a mass ratio of 1:15 to the mixture A, step S2 is dried at 100°C, and step S4 is dried at 110°C Dry.

[0071] Second, the use effect,

[0072] Add 0.05g of the prepared biochar to 200mL of TP wastewater with a concentration of 1mg / L, and the adsorption capacity of TP is 2.15mg / g 生物炭 , the removal rate was 53.78%; adding 0.5g of the prepared biochar to 200mL of TP wastewater with a concentration of 10mg / L, the adsorption capacity of TP was 1.77mg / g 生物炭 , and the removal rate was 44.32%.

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Abstract

The invention provides a method for preparing biochar from bottom mud and garden waste and application of the biochar. The preparation method comprises the following steps: cleaning and drying bottom mud and garden waste, crushing for later use, taking the bottom mud and the garden waste according to a mass ratio of 1:(0.25-4), adding water, uniformly mixing, drying to obtain a mixture A, pyrolyzing the mixture A at 300-700 DEG C for 1-5 hours to obtain a mixture B, adding water into NaOH or FeCl3 serving as a modifier, uniformly mixing with the mixture B, and drying to obtain the biochar. The biochar can adsorb nitrogen and phosphorus in a water body to be used by landscape plants, and nutrients are provided for the plants to reduce the fertilizing amount of the plants, so that waste recycling is achieved, the problems that bottom mud and garden waste are difficult to dispose, and the concentration of phosphorus in the water body is high are effectively solved, a virtuous circle of multiple substances in the water body environment is formed, and the maintenance cost of the water body environment is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of landscape water body ecological restoration. More specifically, it relates to a method for preparing biochar from sediment and garden waste and its application. Background technique [0002] Garden waste, also known as green waste or garden plant waste, mainly refers to the plant residues produced by the natural fall of garden plants or artificial pruning, mainly including leaves, grass clippings, tree and shrub cuttings, etc. With the development of economy and society, the area of ​​urban landscape water environment is getting larger and larger, and landscape plants, as an important part of urban landscape water environment, naturally produce more and more garden waste, and in order to maintain plant landscape, Fertilization uses nitrogen and phosphorus to enter the landscape water body, resulting in eutrophication of the landscape water body, further aggravating the deterioration of the water environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C10B53/00C10B53/02C10B57/04C10B57/10C02F1/28C02F101/10C02F101/16C02F101/30C02F101/38
CPCB01J20/20B01J20/3078C10B53/00C10B53/02C10B57/10C10B57/04C02F1/283C02F2101/105C02F2101/16C02F2101/38C02F2101/30Y02E50/10
Inventor 李萍熊涛管秀娟
Owner GUANGDONG UNIV OF TECH
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