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A method for preparing biochar from kitchen waste

A technology of kitchen waste and biochar, applied in the application, fertilizer mixture, organic fertilizer and other directions, can solve the problems of restricting the reproduction of microorganisms, affecting health, and outbreak of infectious diseases, saving agricultural production costs, improving resource utilization efficiency, Simple to use effects

Active Publication Date: 2017-11-17
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional treatment methods of food waste are mostly landfill or directly used as feed, which has potential harm to the environment, and can easily cause the outbreak of infectious diseases, seriously affect people's health, and bring huge damage to environmental protection work. pressure
Food waste contains high salt and oil, which seriously restricts the reproduction of microorganisms, and limits the anaerobic fermentation of food waste to produce methane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A method for preparing biochar from kitchen waste, the steps are as follows:

[0012] 1. Raw material treatment: air-dry the kitchen waste until the moisture content drops to 9.8%, and then crush it to 4mm particles for later use; 2. Pyrolysis and carbonization: fill the crushed food waste into the carbonization furnace, inject nitrogen, and open Heating device, after heating up to 250°C at a heating rate of 5°C / min, keep the temperature constant for 40 minutes; then raise the temperature to 450°C at a heating rate of 10°C / min, and keep the temperature constant for 2 hours; finally, cool down to 80°C under anoxic conditions Discharging; 3. Adjustment and screening: crush the product obtained in step 2 and pass through a 100-mesh sieve, soak and wash with deionized water for 8 minutes, filter and dry to obtain a pH value of 8.5, an organic matter content of 62%, and a nutrient content of 10-15%. , porosity 0.30cm 3 / g, pore size 25-40nm, average specific surface area 2...

Embodiment 2

[0015] A method for preparing biochar from kitchen waste, the difference from Example 1 is: in step 1, the food waste is air-dried until the moisture content drops to 8.5%; After the heating rate is raised to 250°C, the temperature is kept constant for 40 minutes; then the temperature is raised to 450°C at a heating rate of 10°C / min, and the temperature is kept constant for 2 hours; finally, the temperature is lowered to 80°C and the material is discharged under the condition of feeding nitrogen gas; obtained in step 3 pH 8.0, organic matter content over 55%, nutrient content 15%, porosity 0.32cm 3 / g, pore size 25-40nm, average specific surface area 220m 3 / g of biochar; after applying 1000kg per mu, the soil pH value increased by 0.45, the soil bulk density decreased by 10%, and the total porosity increased by 12%.

[0016] This embodiment is the best embodiment. When the water content is reduced to 8.5%, the performance is the best. When the water content is lower than 8.5...

Embodiment 3

[0018] A method for preparing biochar from kitchen waste, which differs from Example 1 in that: in step 1, the food waste is air-dried until the water content drops to 9.5%; in step 2, the temperature is raised to After 300°C, keep the temperature constant for 30 minutes; then raise the temperature to 500°C at a heating rate of 20°C / min, and keep the temperature constant for 1 hour; finally, cool down to 80°C under anoxic conditions and discharge; the pH value obtained in step 3 is 8.6, and the organic matter content 51%, nutrient content 5-10%, porosity 0.34cm 3 / g, pore size 30~40nm, average specific surface area 180m 3 / g of biochar; after applying 200kg per mu, the soil pH value increased by 0.18, the soil bulk density decreased by 6%, and the total porosity increased by 7%.

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Abstract

The invention discloses a method for preparing biological charcoal by utilizing kitchen waste. The method comprises the following steps: airing the kitchen waste until the moisture content is reduced to below 10%, adding crushed particles into a carbide furnace, introducing nitrogen and heating at the temperature rise speed of 2-10DEG C / min to 200-300DEG C, and keeping the constant temperature for 30-60min; heating at the temperature rise speed of 5-20DEG C / min to 350-500DEG C and keeping the constant temperature for 1-4h; then cooling to 80DEG C under anoxic condition and discharging; crushing and sieving with a 100-mesh sieve, to obtain biological charcoal. The method is simple to operate, the prepared biological charcoal is large in specific surface area, the property of soil can be improved after the method is used in the farmland, the soil fertility can be improved, agricultural production cost can be saved, and the polluted soil can be restored; the environment pollution caused by kitchen waste can be reduced, and the method provides a new approach for the disposition of the kitchen waste, leads the kitchen waste industry to low-carbon sustainable health development, and has wide popularization and application prospects.

Description

technical field [0001] The invention relates to a method for preparing biochar from kitchen waste, and belongs to the field of resource utilization of agricultural solid waste. Background technique [0002] With the shortage of energy and resources and the increasingly serious environmental pollution, the research on the utilization of biomass resources has attracted extensive attention. Kitchen waste is the solid waste generated by residents in the production and living process. It is a general term for the leftovers discarded by catering units and is the main component of urban organic domestic waste. With the continuous improvement of living standards, the amount of food waste generated continues to increase. However, the traditional treatment methods of food waste are mostly landfill or directly used as feed, which has potential harm to the environment, and can easily cause the outbreak of infectious diseases, seriously affect people's health, and bring huge damage to e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F9/00C05G3/04C05G3/80
CPCC05G3/80Y02A40/20
Inventor 辛言君杜海岩刘永萍陈清华
Owner QINGDAO AGRI UNIV