A method of combined aerobic composting and leaching technology to treat humus soil in stale landfill

Abstract

The invention discloses a method for treating humus soil in a stale garbage landfill by combining aerobic composting and leaching technology. Aerobic composting treatment; the humus soil treated with aerobic composting is sequentially treated with organic acid solution and water leaching, and then dried; this method can make the humus soil salt content, organic matter, heavy metals, etc. "(CJ / T 340‑2016) standard is of great significance for the large-scale resource utilization of humus soil.

Description

technical field

[0001] The invention relates to a treatment method for humus soil in old waste landfills, in particular to a method for treating humus soil in old waste landfills by combining aerobic composting and extraction technology to achieve organic matter degradation and heavy metal removal. The technical field of obsolete garbage disposal. Background technique

[0002] Stale waste, also called mineral waste, refers to municipal solid waste that has been landfilled or piled up for many years. Since the 1970s, my country has gradually begun to use the landfill method to dispose of municipal solid waste. With large-scale land development in recent years, these landfill sites have become scarce resources and have great development value. However, due to the lack of effective protective measures during the operation period of the informal landfill, the pollution of water, gas and odor produced not only seriously affected the lives of the surrounding residents, but also ...

Examples

Embodiment 1

[0029] Preparation of microbial inoculum: Inoculate Penicillium and Aspergillus fungi extracted and isolated from stale garbage on the slope, and culture at 28-35°C for 6 days. The shake flask culture solution is deionized water with 15% sucrose, 0.2% nitrate, 0.1% potassium dihydrogen phosphate, and 0.25% magnesium sulfate heptahydrate, and the container is shaken until the solute is dissolved, and then sterilized at high temperature. Rinse the slant with sterile water and inoculate the microorganisms into the shake flask culture solution, place them in a constant temperature shaking incubator, and cultivate them for 6 days. After expanded culture, the number of Penicillium and Aspergillus in the mixed bacterial solution reached 10 6 cfu / ml, and finally inoculated into humus in batches.

[0030] Application experiment: First, the stale garbage is plowed, dried, crushed and sieved to obtain humus soil with particle size ≤ 2mm. Add 1% manure + plant ash to the humus soil to a...

Embodiment 2

[0033] Preparation of microbial inoculum: Inoculate purchased Aspergillus niger strains on a slant and culture at 28-35°C for 5 days. The shake flask culture solution is deionized water with 15% sucrose, 0.2% nitrate, 0.1% potassium dihydrogen phosphate, and 0.25% magnesium sulfate heptahydrate, and the container is shaken until the solute is dissolved, and then sterilized at high temperature. Rinse the slant with sterile water and inoculate the microorganisms into the shake flask culture solution, place them in a constant temperature shaking incubator, and cultivate them for 5 days. After expanding the culture, the number of Aspergillus niger in the mixed bacterial solution reached 10 7 cfu / ml, and finally inoculated into humus in batches.

[0034] Application experiment: First, the stale garbage is plowed, dried, crushed and sieved to obtain humus soil with particle size ≤ 2mm. Add 1.5% manure + plant ash to the humus soil to adjust the C / N ratio in the humus soil to 20:1....

technical field

[0001] The invention relates to a treatment method for humus soil in old waste landfills, in particular to a method for treating humus soil in old waste landfills by combining aerobic composting and extraction technology to achieve organic matter degradation and heavy metal removal. The technical field of obsolete garbage disposal. Background technique

[0002] Stale waste, also called mineral waste, refers to municipal solid waste that has been landfilled or piled up for many years. Since the 1970s, my country has gradually begun to use the landfill method to dispose of municipal solid waste. With large-scale land development in recent years, these landfill sites have become scarce resources and have great development value. However, due to the lack of effective protective measures during the operation period of the informal landfill, the pollution of water, gas and odor produced not only seriously affected the lives of the surrounding residents, but also ...

Examples

Embodiment 1

[0029] Preparation of microbial inoculum: Inoculate Penicillium and Aspergillus fungi extracted and isolated from stale garbage on the slope, and culture at 28-35°C for 6 days. The shake flask culture solution is deionized water with 15% sucrose, 0.2% nitrate, 0.1% potassium dihydrogen phosphate, and 0.25% magnesium sulfate heptahydrate, and the container is shaken until the solute is dissolved, and then sterilized at high temperature. Rinse the slant with sterile water and inoculate the microorganisms into the shake flask culture solution, place them in a constant temperature shaking incubator, and cultivate them for 6 days. After expanded culture, the number of Penicillium and Aspergillus in the mixed bacterial solution reached 10 6 cfu / ml, and finally inoculated into humus in batches.

[0030] Application experiment: First, the stale garbage is plowed, dried, crushed and sieved to obtain humus soil with particle size ≤ 2mm. Add 1% manure + plant ash to the humus soil to a...

Embodiment 2

[0033] Preparation of microbial inoculum: Inoculate purchased Aspergillus niger strains on a slant and culture at 28-35°C for 5 days. The shake flask culture solution is deionized water with 15% sucrose, 0.2% nitrate, 0.1% potassium dihydrogen phosphate, and 0.25% magnesium sulfate heptahydrate, and the container is shaken until the solute is dissolved, and then sterilized at high temperature. Rinse the slant with sterile water and inoculate the microorganisms into the shake flask culture solution, place them in a constant temperature shaking incubator, and cultivate them for 5 days. After expanding the culture, the number of Aspergillus niger in the mixed bacterial solution reached 10 7 cfu / ml, and finally inoculated into humus in batches.

[0034] Application experiment: First, the stale garbage is plowed, dried, crushed and sieved to obtain humus soil with particle size ≤ 2mm. Add 1.5% manure + plant ash to the humus soil to adjust the C / N ratio in the humus soil to 20:1....

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