Two-phase wet-type anaerobic digestion treatment method of food waste

A technology of food waste and anaerobic digestion, which is applied in the field of food waste treatment and two-phase wet anaerobic digestion treatment of food waste, which can solve the problems of low VFA yield, high processing cost, and large power consumption.

Inactive Publication Date: 2010-10-20
上海派升环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods of separate treatment of food waste are mainly composting and making feed, but composting food waste and making feed can easily cause secondary pollution
In addition, some food waste generating units directly use biochemical waste disposers, but the use of biochemical waste disposers (for example: ZL021509721.7, ZL02254957.9, ZL00228327.1, ZL98231038.2) consumes a lot of power, and the processing cost is high. The carbon dioxide gas produced will aggravate the greenhouse effect
[0005] Research on anaerobic fermentation of kitchen waste has been on the rise in recent years, but there are few specialized research reports on this aspect. The physical properties were studied, the CSTR (fully mixed flow) reactor was used, the optimal hydraulic retention (HRT) was 30 days, and the yield of VFA (volatile fatty acid) was 22.54g VFA / kgTS.d
Simply using this process, the hydraulic retention time is too long, and the yield of VFA is not high

Method used

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  • Two-phase wet-type anaerobic digestion treatment method of food waste
  • Two-phase wet-type anaerobic digestion treatment method of food waste
  • Two-phase wet-type anaerobic digestion treatment method of food waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the garbage in the canteen of the North District of Shanghai Jiao Tong University as an example. Generally speaking, food waste mainly contains three types of substances: carbohydrates, fats and proteins. The garbage used in this embodiment contains more carbohydrates, and the water content is 55% to 65%. After adding water and pulverizing, the solid content is 30% to 50%. Dilution is performed to adjust the feed solid content to 15% to 21%. The carbon dioxide absorption device is equipped with sodium hydroxide absorption liquid, and the concentration of the absorption liquid is determined according to the carbon dioxide content in the gas obtained from the test.

[0023] What adopted in the present embodiment is medium temperature (35 DEG C), adopt the method of the present invention, not only can reduce operating cost, and the stability of process operation and treatment effect are all better than existing two-phase anaerobic digestion treatment method, TS (solid...

Embodiment 2

[0028] Take the garbage of Shanghai Wisteria Hotel as an example. There is a certain difference between hotel garbage and student canteen garbage, which contains more oily substances, accounting for 50-70% of the total solids. use as figure 1 In the process flow shown, the garbage is crushed first, and then diluted before entering the acidification reactor to make its solid content 5-10%. Since oil is more difficult to degrade than carbohydrates, a longer solid retention time is adopted. time.

[0029]

Embodiment 3

[0031] Take the kitchen waste of the Lingering Garden Hotel in Shanghai Jiaotong University as an example. After sampling and testing, it was found that the protein content in the food waste of Lingering Garden Hotel was relatively high, accounting for 45-60% of the total solid content. figure 1 In the process shown, the temperature of the acidification phase in this embodiment is 55°C, the temperature of the methane phase is 35°C, and the temperature, pH and oxidation-reduction potential (ORP) in the reactor are tracked and detected, and the operating results are as follows:

[0032]

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Abstract

The invention relates to a two-phase wet-type anaerobic digestion treatment method of food waste, which adopts an intermittent two-stage wet-type anaerobic digestion process aiming at food waste treatment characteristics: the solid-liquid separation is simultaneously achieved when crushed food waste is put in a hydrolysis acidification reactor to carry out acidification, acidified liquid enters into a methane-phase reactor to carry out continuous digestion, digested gas passes through a methane and carbon dioxide detector and a carbon dioxide absorber in sequence and finally enters into a gas collection device, and effluent water digestion liquid of a methane phase is recycled to an acidification phase. In the invention, the solid-liquid separation is simultaneously realized in the hydrolysis acidification process, therefore, the production ratio of volatile fatty acid is increased, and the hydraulic retention time of the acidification phase is reduced; effluent water of the methane phase is recycled to the acidification phase so as to dilute the input concentration and be capable of adjusting the pH value of the acidification reaction, therefore, the operation cost is saved, the pH value is easy to control, and the acidification effect is remarkably enhanced.

Description

technical field [0001] The invention relates to a treatment method for kitchen waste, in particular to a two-phase wet anaerobic digestion treatment method for kitchen waste, which solves the problem of low hydrolysis and acidification efficiency of kitchen waste, and belongs to the field of environmental protection. Background technique [0002] With the development of urban economy, the amount of domestic waste generated in China continues to increase, and the composition of domestic waste also changes with the changes in consumption structure and energy structure, but it still shows high organic matter content, high water content, and the calorific value of mixed collected waste Low salient features, the proportion of kitchen waste in domestic waste can be as high as 70%. [0003] Food waste directly comes from food waste and waste cooking oil generated in activities other than residents’ daily life, such as food processing, catering services, and unit meals, and is easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 史红钻
Owner 上海派升环保科技有限公司
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