Method for promoting rapid preparation of methane from organic waste by utilizing exogenous hydrogen

A technology for organic waste and methane production, applied in waste fuel, fermentation, etc., can solve the problems of unbalanced distribution, unsuitable scale, complicated operation, etc., shorten anaerobic digestion cycle, increase methane bacteria activity, and reduce CO2 concentration Effect

Inactive Publication Date: 2011-09-14
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Although there are many methods for increasing methane production reported at present, there are the following problems: 1. The promotion effect is not obvious, and some additives can only increase about 5-10% of methane due to loss or inability to distribute evenly; 2. The operation is complicated and difficult control
Although two-phase anaerobic fermentation can control the conditions of the methanogenic stage to the best, adjusting the parameters of the fermentation stage is a huge project for a device or site with

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  • Method for promoting rapid preparation of methane from organic waste by utilizing exogenous hydrogen
  • Method for promoting rapid preparation of methane from organic waste by utilizing exogenous hydrogen
  • Method for promoting rapid preparation of methane from organic waste by utilizing exogenous hydrogen

Examples

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Example Embodiment

[0021] Example 1

[0022] After the household garbage with a moisture content of 50-60% is simply crushed, 12 samples of household garbage are weighed, each 0.070kg. At the same time, prepare sludge with a moisture content of 60-80%, and weigh 12 portions, each 0.030g. Take 1 part each of domestic garbage and sludge and mix them thoroughly and put them into 200 mL plastic test bottles. In this experiment, a total of 12 mixed experimental samples were placed in 12 test bottles, divided into 6 groups, each with two parallel samples. The VS content of the mixed experimental sample is about 20%, and the moisture content is about 65%. Nitrogen was introduced so that the test bottle contained no other impurity gases, and it was sealed and placed in a constant temperature chamber at 37°C to simulate anaerobic fermentation. Add 0, 1, 3, 5, 7, 10 mL of pure H from the lower end of the test bottle with a syringe under a pressure of 3.3 MPa 2 (0 mL is the blank group for comparison; sinc...

Example Embodiment

[0023] Example 2

[0024] See attached Figure 4 .

[0025] If acid accumulation occurs during the anaerobic decomposition of garbage, that is, the pH drops, the rate of methane production will be greatly reduced, and the process of garbage decomposition will also slow down. The hydrogen addition amount is selected as 0, 3mL and 5mL, and the rest is the same as in Example 1. The solid sample is sampled within one cycle of the reaction (7-14 days), and the pH is measured with a mixture of solid sample: water = 1:3. The results are shown in Figure 4 . by Figure 4 It can be seen from the pH of the system that the pH of the blank group has dropped below 6.4. Such a downward trend will greatly inhibit the activity of methanogens and hinder the decomposition of garbage and the production of methane. After adding hydrogen, the pH of the anaerobic fermentation process is stable at 6.5-7.8, which effectively prevents the accumulation of volatile fatty acids, which is beneficial to the su...

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Abstract

The invention relates to a method for promoting the rapid preparation of methane from organic waste by utilizing exogenous hydrogen. The method comprises the following steps of: mixing sludge and domestic garbage in a weight ratio of 1:(2-4), wherein the content of volatile substances (VS) in the mixture is 20 to 65 percent, and the water content is 18 to 68 percent; and performing anaerobic fermentation reaction on the mixture for a period of 7 to 14 days at the temperature of between 35 and 37 DEG C and at the pH value of between 6.5 and 7.5, and introducing exogenous pure hydrogen under the pressure of between 1.1 and 5.5MPa from the bottom of the mixture in the second day of each period, wherein the maximum daily output of the methane can reach 3.65L/kg.d when the introducing amount is 50 to 150mL H2/kg VS, and is 2.81 times the yield of the methane when the hydrogen is not added. The concentration of the methane can be improved from 33.2 percent to 75.5 percent. The cost is low, the method is easy to operate, the problem of environmental pollution of municipal refuse and greenhouse gas is solved, and the clean energy is also provided, so that the method has good social benefit and economic benefit. The method can be widely applied to the rapid preparation of the methane from the organic waste in middle and small-sized landfill sites.

Description

technical field [0001] The invention relates to a method for using exogenous hydrogen to promote rapid methane production of organic waste, and belongs to the technical field of solid waste recycling and pollution prevention and control. Background technique [0002] With the sustainable development of the economy and the steady improvement of residents' living standards, the annual output of municipal solid waste in my country has reached 150 million tons (per capita daily output is 0.9-1.2 kg), and it is increasing at a rate of 8-10% every year. Landfill is still the main way to deal with domestic waste in most cities in my country. During the landfill process, a large amount of methane greenhouse gas will be released, with a content as high as 50-60%. In large-scale landfills, landfill gas will be collected through pipelines and special gas-collecting devices, but for small and medium-sized landfills, due to unstable gas production, low total gas volume, and low comprehen...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 赵由才韩丹
Owner TONGJI UNIV
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