High-solid anaerobic treatment method for kitchen waste

A technology for kitchen waste and anaerobic treatment is applied in the field of kitchen waste treatment and high-solid anaerobic digestion and treatment of kitchen waste to achieve the effects of increasing solid content, low operating energy consumption and overcoming large volume.

Pending Publication Date: 2022-03-22
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no research report on alkali pretreatment with a solid content higher than 8% in conjunction with bentonite anaerobic digestion. The present invention complements the addition of additives and alkali treatment to synergistically promote high-solid anaerobic digestion of kitchen waste

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] The food waste with a solid content of 22.5% is pulverized and directly enters the pretreatment tank for dry alkali pretreatment. The pretreatment material is 3% CaO, the temperature is 25°C, and the solid residence time is 1 day; The food waste after alkali pretreatment is diluted to a solid content rate of 12%, and then anaerobic digestion is performed. The reaction temperature is 35°C, the solid residence time is 35 days, and the methane yield is 140.1CH 4 / g-VSadd, the methane yield increased by 232.8% compared with the untreated and no bentonite, and the stagnation period of gas production was 4 days, which was shortened by 9 days.

Embodiment 2

[0026] The food waste with a solid content of 25.3% is pulverized and directly enters the pretreatment tank for dry alkali pretreatment. The pretreatment material is 4% CaO, the temperature is 25°C, and the solid residence time is 1 day; it is diluted to contain After the solid rate was 12%, bentonite was added at 0.6g / g-VS for anaerobic digestion, the reaction temperature was 37°C, the solid residence time was 40 days, and the methane yield was 153.0mL CH 4 / g-VSadd, the methane yield increased by 261.7%, and the COD removal rate was 82.2%, an increase of 7.2%.

Embodiment 3

[0028] The food waste with a solid content of 25.3% is pulverized and directly enters the pretreatment tank for dry alkali pretreatment. The pretreatment material is 2% CaO, the temperature is 25°C, and the solid residence time is 1 day. After the solid rate was 12%, bentonite was added at 0.6g / g-VS for anaerobic digestion, the reaction temperature was 37°C, the solid residence time was 40 days, and the methane yield was 178.9mL CH 4 / g-VSadd, the methane yield increased by 322.9%, and the COD removal rate was 80.0%, an increase of 5.0% compared with the untreated and no bentonite.

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Abstract

The invention belongs to the technical field of organic waste treatment and energy regeneration, and relates to a high-solid anaerobic digestion treatment method of kitchen waste, which comprises the following steps: crushing the kitchen waste with the solid content of 20-25%, directly feeding the kitchen waste into a pretreatment tank, adding an alkaline substance accounting for 1-4% of the mass of the waste to be treated, uniformly stirring, and carrying out alkali pretreatment at the reaction temperature of 25 + / -5 DEG C, the solid staying time is 24-48 hours; the kitchen waste subjected to alkali pretreatment enters a mixing pool, 0.2-1 g / g-VS additive is added, and the kitchen waste and the VS additive are mixed to be uniform; inoculating the homogenized kitchen waste with sludge, diluting with water until the solid content is 10-18%, and carrying out high-solid anaerobic digestion; and carrying out solid-liquid-gas separation after anaerobic digestion. Compared with low-solid anaerobic digestion, the method provided by the invention overcomes the bottlenecks of large volume of a reaction tank, high heating energy consumption and investment cost, difficulty in treatment of biogas slurry and biogas residues and the like; and compared with the existing high-solid anaerobic digestion, the solid content is further improved, the defects of long methane production stagnation period and low methane yield are overcome, and the stability and continuity of the anaerobic digestion process are improved.

Description

technical field [0001] The invention belongs to the technical field of organic waste treatment and energy conversion, and relates to kitchen waste treatment, in particular to a high-solid anaerobic digestion treatment method for kitchen waste. Background technique [0002] Food waste has a high water content and is rich in organic pollutants, which is easily spoiled and acidified, breeding pathogenic bacteria and pathogenic microorganisms, and endangering human health. If it is not handled properly, the leachate produced by the kitchen waste will seep down, pollute the soil and groundwater, and seriously endanger the ecological environment. In addition, food waste contains a large amount of hydrocarbon-containing organic substances, which is a potential resource. Reasonable treatment and disposal of food waste can recover energy. Anaerobic digestion is a green and economical treatment process, which can recover biogas while processing food waste, and can realize the reducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C10L3/08
CPCC12P5/023C10L3/08Y02E50/30
Inventor 胡玉瑛张世豪王鑫戴红玲彭小明汪楚乔魏杨单莉莉
Owner EAST CHINA JIAOTONG UNIVERSITY
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