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Rancidity-prone waste biogas utilization method based on in-subarea inoculation and quick start

A waste and biogas technology, applied in biological sludge treatment, waste fuel, fermentation, etc., can solve the problems of increased reactors, increased production costs, and difficulty in starting the waste gas production process, and achieves the effect of promoting degradation and avoiding loss.

Active Publication Date: 2012-06-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) The large-scale mixing of raw materials and digested solid-phase products will inevitably lead to a substantial increase in the number of reactors required
And even if a large amount of inoculated sludge is mixed, it is difficult to start the gas production process of the garbage; when the garbage falls into rancidity, the gas production stops quickly, and even if a large amount of inoculated sludge is mixed, it is difficult to resume
3) The process of solid-liquid separation treatment requires an additional large-volume wastewater methanation reactor and solid-liquid separation facilities, resulting in a substantial increase in production costs; and the methanation reactor can only allow liquids with a very low solid concentration to enter methane fermentation Can
The latter two methods above all need to set up a separate methane-producing reactor, and the production cost is relatively high

Method used

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  • Rancidity-prone waste biogas utilization method based on in-subarea inoculation and quick start
  • Rancidity-prone waste biogas utilization method based on in-subarea inoculation and quick start
  • Rancidity-prone waste biogas utilization method based on in-subarea inoculation and quick start

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 - quick start of biogas utilization of kitchen waste

[0059] (1) From the feed port 12 to the garbage filling area 05, start-up liquid containing nutrient salts and a small amount of organic matter is pumped in once until it exceeds the liquid level of the discharge pump 13; the solid concentration of the material in the garbage filling area does not exceed 5%.

[0060] (2) Close the self-circulation loop 17 and the discharge 02; control the flow of the return pipe 16 at a certain flow rate, and spray it into the microbial agent loading area 18 through the material distribution pipe 08 to start the microbial agent 22 inside the microbial agent filling ball 06 Biomass-producing activity, as well as flushing the possible residual particulate organic matter inside the microbial agent filled ball 06. After more than 10 days of backflow spraying, the domestication and growth of methanogens were completed. For the present invention, before starting to start the bi...

Embodiment 2

[0065] Example 2 - Biogas Utilization of Batch Feed MSW

[0066] The processing raw material in this embodiment is municipal solid waste.

[0067] (1) Municipal solid waste should be pretreated by sorting, crushing and screening to remove large-sized components (greater than 2cm) and biodegradable inert components and impurities in the garbage, so as to obtain smaller-sized and more homogeneous rubbish (less than 2cm);

[0068] (2) Disposable pumping into the garbage filling area 05 to below the liquid level 10; close the discharge 02 and the self-circulation loop 17; municipal solid waste is hydrolyzed and acidified in the garbage filling area. In the present embodiment, the conditions for hydrolysis and acidification are: The pH value is 6-7.5, the temperature is 42°C, the residence time is 3 days, and the operating range of solid concentration is 25%-35%;

[0069] (3) In an intermittent or semi-continuous manner, control the return pipe 15 with a certain flow rate (the fl...

Embodiment 3

[0072] Example 3 - Biogas Utilization of Continuous Feed Fruit and Vegetable Garbage

[0073] The processing raw material of this embodiment is fruit and vegetable waste.

[0074] (1) Fruit and vegetable waste should be pretreated by sorting, crushing, and screening to remove large-size components (greater than 2 cm) and biodegradable inert components and impurities in the waste, so as to obtain smaller and more homogeneous waste. Garbage (less than 2cm);

[0075] (2) Disposable pump into the garbage filling area 05 to below the liquid level 10; close the discharge 02 and the self-circulation loop 17; the fruit and vegetable garbage is hydrolyzed and acidified in the garbage loading area. In the present embodiment, the condition for hydrolysis and acidification is: pH The value is 5.5-7, the temperature is 35°C, the residence time is 3 days, and the operating range of solid concentration is 17%-25%;

[0076] (3) In an intermittent or semi-continuous manner, control the retur...

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Abstract

The invention belongs to the technical field of solid waste pollution control, and relates to a method for making biogas from waste, which comprises the following steps: (1) pretreating the waste; (2) feeding the waste into a waste loading area for hydrolysis and acidification; (3) feeding the material subjected to hydrolysis and acidification in step (2) into a microbial inoculum loading area, and performing biogas production reaction under the effect of the microbial inoculum; (4) flowing out the material treated in step (3) from the microbial inoculum loading area, and returning to the waste loading area for further hydrolysis and acidification; and (5) repeating the cycle from step (2) to step (4) multiple times until the conversion of the waste into biogas is maximized. The invention overcomes the disadvantages of high rancidity possibility, long gas production start time, low gas production yield and gas production rate and the like of the waste conventional biogas utilization system, can greatly accelerate the gas production process of the rancidity-prone waste with a small amount of microbial inoculum, increases the gas production yield of the waste, lowers the amounts of leavings and waste liquids, and decreases the volume of a reactor and the operating cost.

Description

technical field [0001] The invention belongs to the technical field of solid waste pollution control, and relates to a method for producing biogas by using garbage. Background technique [0002] Anaerobic digestion with methane as the final product is an important technology to realize waste treatment and resource utilization. Not only can clean and renewable energy be obtained from it, but also its technical process is relatively mature, and it has been industrialized on a considerable scale and has broad application prospects. However, in actual engineering, there are problems such as low utilization rate of reactor volume and unstable digestion process. How to control the process stability of the digestion process and improve the digestion efficiency is the main direction of the development of this technology at present. [0003] Anaerobic digestion refers to the process in which various organic substances that constitute solid waste are decomposed by microorganisms in ...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 何品晶吕凡郝丽萍吴铎张春燕邵立明
Owner TONGJI UNIV
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