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Method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion

A technology of hydrothermal carbonization and anaerobic digestion, which is applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., and can solve problems such as difficult treatment of biogas residue and biogas slurry, acidification of anaerobic environment, and impact on treatment efficiency , to achieve the effect of realizing resource utilization, obvious application effect and increasing methane production

Active Publication Date: 2019-01-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention directly performs anaerobic digestion on the solid phase, which will lead to acidification of the anaerobic environment caused by high load, which will affect the treatment efficiency, and the large amount of biogas residue and biogas slurry produced are difficult to handle

Method used

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  • Method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion
  • Method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion
  • Method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion

Examples

Experimental program
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Embodiment 1

[0059] This embodiment provides a method for hydrothermal carbonization coupling anaerobic digestion to treat food waste, wherein, the method adopts such as Figure 4 Described processing system realizes, and this method comprises the following specific steps:

[0060] (1) Pretreatment of kitchen waste

[0061] After the food waste is collected and transported, it is first subjected to rough sorting to separate out substances that cannot undergo hydrothermal carbonization reactions, such as glass, metal, stone, etc.; then, centrifugal deoiling is carried out in the deoiling tank 1 to separate the oily phase The solid phase and oil phase are sent to process biodiesel, and the solid phase enters the next crushing system 2 for crushing; after the crushing is completed, it enters the preheating tank 3 for stirring and preheating, and the preheating temperature is 80-90°C.

[0062] (2) Hydrothermal carbonization of kitchen waste

[0063] The preheated food waste is sent to the hy...

Embodiment 2

[0070] This embodiment provides a method for reusing the liquid phase obtained after hydrothermal carbonization of kitchen waste to increase the solid phase yield and calorific value, which includes the following steps:

[0071] (1) After the food waste is collected and transported, it is firstly sorted to separate substances that cannot undergo hydrothermal carbonization reaction, such as glass, metal, stone, etc.; then, centrifugal deoiling is carried out to separate the oil phase and solid phase , the oil phase is sent to process biodiesel, and the solid phase enters the next crushing system for crushing; after the crushing is completed, it enters the preheating tank for stirring and preheating, and the preheating temperature is 80-90°C.

[0072] Wherein, the kitchen waste described in step (1) includes meat, rice, steamed buns, fruits and vegetables and the like.

[0073] (2) Get 50g of the kitchen waste (moisture content 80%) gained in step (1) and mix it with 25mL deioni...

Embodiment 3

[0079] This embodiment provides a method for fermenting hydrothermal charcoal, hydrothermal liquid, and a mixture of hydrothermal charcoal and hydrothermal liquid obtained after the hydrothermal carbonization reaction to increase gas production, which includes the following steps:

[0080] (1) Experimental group A: The fermentation raw material is the hydrothermal charcoal prepared in Example 1, the fermentation concentration is 10g / L (calculated based on the total volume of the inoculum used), the total reaction volume is 250mL, and the inoculum is the biogas from the landfill. Liquid, such as biogas slurry from Asuwei Landfill (Changping District, Beijing), does not add any accelerator.

[0081] (2) Experimental group B: The fermentation raw material is the hydrothermal solution prepared in Example 1, the fermentation volume is 100mL / L (calculated based on the total volume of the inoculum used), the total reaction volume is 250mL, and the inoculum is the biogas from the landf...

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Abstract

The invention provides a method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion. The method comprises the following steps: (1) carrying out a hydrothermal carbonization reaction on crushed kitchen wastes, separating the hydrothermal carbonization reaction product to obtain a hydrothermal solution and a solid product, and drying the solid product to obtain hydrothermal carbon; and (2) carrying out anaerobic digestion treatment on the hydrothermal carbon and the hydrothermal solution obtained in the step (1) or a mixture of the hydrothermal carbon and the hydrothermal solution. According to the method for treating kitchen wastes by hydrothermal carbonization coupled anaerobic digestion, provided by the invention, a hydrothermal carbonization technology and an anaerobic digestion technology are coupled to treat the kitchen wastes, so that the recycle, harmlessness and reduction of the kitchen wastes can be realized.

Description

technical field [0001] The invention relates to a method for hydrothermal carbonization coupled with anaerobic digestion to treat kitchen waste, and belongs to the technical field of resource utilization of waste organic matter and production and application of clean energy. Background technique [0002] Food waste refers to food residues in canteens, households and catering industries, mainly including steamed bread, rice, fruit peels, vegetables, oil and water, etc. The chemical composition mainly includes starch, protein, inorganic salts, lipids, cellulose, etc. High water content, organic matter, salt and oil content are relatively high. With the growth of the economy and the rapid development of the catering industry, the food waste is also increasing rapidly. According to statistics, the national food waste production in 2017 was as high as 99.72 million tons. In the early stage, the country has started large-scale food waste treatment facilities. The pilot constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/40
Inventor 李叶青赵坤江皓周红军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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