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Method for improving efficiency of producing methane through kitchen waste high-concentration anaerobic digestion

A technology for kitchen waste and anaerobic digestion, which is applied in fermentation, biological sludge treatment, sludge treatment and other directions, can solve the problems of unfavorable anaerobic digestion process, stable operation, easy acidification, and poor economic benefits.

Active Publication Date: 2016-03-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volumetric gas production rate is low, the economic benefit is poor, and a large amount of anaerobic wastewater will be produced after fermentation, which will bring serious hidden dangers of secondary pollution
The use of high-concentration or solid-state fermentation technology can significantly increase the volumetric gas production rate and reduce the generation of wastewater. However, the hydrolysis speed of food waste is fast, and it is easy to acidify under high-concentration conditions, resulting in fermentation failure, which is not conducive to the stable operation of the anaerobic digestion process.
Increasing the inoculum ratio of anaerobic fermentation of food waste can alleviate the acidification problem. The proportion of food in the system becomes smaller, the volumetric gas production rate becomes smaller, and the utilization rate of equipment decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Simply drain the collected food waste to make the water content ≤ 80%, and remove the non-fermentable substances.

[0034] 2) The kitchen waste obtained in 1) is removed and crushed to a size of ≤20 mesh.

[0035] 3) Mix the kitchen waste obtained in 2) with the anaerobic activated sludge according to the total volatile matter (VS) content ratio of 1:1.

[0036] 4) Cultivate E.cloacaeDSM16657 with gravy medium for 0.3 days to obtain a bacterial solution with an OD>1.0.

[0037] 5) The mixture obtained in 3) was adjusted to a total TS content of 11%, and distributed into fermentation bottles with an effective volume of 400ml.

[0038] 6) Add NaHCO to 5) 3 until the system alkalinity is 3000mg / CaCO 3 / L to keep the pH between 6.0-8.2 during anaerobic fermentation.

[0039] 7) On the first day of anaerobic fermentation, add 10% of the bacterial solution of 4) to 6), and mix well.

[0040] 8) Pass the air in the inert gas removal device into 7), and seal it.

[004...

Embodiment 2

[0044] 1) Simply drain the collected food waste to make the water content ≤ 80%, and remove the non-fermentable substances.

[0045] 2) The kitchen waste obtained in 1) is removed and crushed to a size of ≤20 mesh.

[0046] 3) Mix the kitchen waste obtained in 2) with the anaerobic activated sludge according to the total volatile matter (VS) content ratio of 1:0.5.

[0047] 4) Cultivate E.cloacaeDSM16657 with gravy medium for 1 day to obtain a bacterial solution with an OD>1.0.

[0048] 5) The mixture obtained in 3) was adjusted to a total TS content of 12%, and distributed into fermentation bottles with an effective volume of 400ml.

[0049] 5) Add NaHCO3 to 6) until the alkalinity of the system is 3000mg / CaCO 3 / L to keep the pH between 6.0-8.2 during anaerobic fermentation.

[0050] 7) On the third day of anaerobic fermentation, add 5% of 4) bacterial solution to 6), and mix well.

[0051] 8) Pass the air in the inert gas removal device into 7), and seal it.

[0052] 9...

Embodiment 3

[0055] 1) Simply drain the collected food waste to make the water content ≤ 80%, and remove the non-fermentable substances.

[0056] 2) The kitchen waste obtained in 1) is removed and crushed to a size of ≤20 mesh.

[0057] 3) The kitchen waste obtained in 2) was mixed with the anaerobic activated sludge according to the total volatile matter (VS) content ratio of 1:1.

[0058] 4) Cultivate E.cloacaeDSM16657 with gravy medium for 0.5 days to obtain a bacterial solution with an OD>1.0.

[0059] 5) The mixture obtained in 3) was formulated so that the total TS content was 13%, and it was dispensed into fermentation bottles with an effective volume of 400ml.

[0060] 5) Add NaHCO to 6) 3 until the system alkalinity is 3000mg / CaCO 3 / L to keep the pH between 6.0-8.2 during anaerobic fermentation.

[0061] 7) On the first day of anaerobic fermentation, add 20% of 4) bacterial solution to 6), and mix well.

[0062] 8) Pass the air in the inert gas removal device into 7), and se...

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Abstract

The invention discloses a method for improving efficiency of producing methane through kitchen waste high-concentration anaerobic digestion and belongs to the technical field of kitchen waste treatment. According to the method, pretreated kitchen waste is smashed and then mixed with anaerobic activated sludge to cultivate enterobacter cloacae and obtain bacterial liquid, the solid concentration and alkalinity of the mixture of the kitchen waste and the anaerobic activated sludge are blended, and enterobacter cloacae liquid is added and mixed uniformly to carry out anaerobic digestion. The method can ensure that the kitchen waste can ferment on the high-concentration condition, and meanwhile the high volume gas production rate can be obtained.

Description

technical field [0001] The invention relates to a method for improving the methane production efficiency of high-concentration anaerobic digestion of kitchen waste, and belongs to the technical field of kitchen waste treatment. Background technique [0002] Food waste is one of the main components of municipal solid waste, and the catering industry, households, and fruit and vegetable wholesale markets will generate a large amount of food waste. The main characteristics of food waste are high content of organic matter, easy to deteriorate and rot, and easy to breed bacteria and pathogens. If it is not handled properly, it will cause a series of environmental and social problems. Food safety issues such as "gutter oil" and "garbage pigs" once became the focus of social attention. Relevant statistics show that the production of food waste in my country in 2014 has exceeded 90 million tons, and the growth trend is obvious. Among the current kitchen waste treatment technologie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023Y02E50/30Y02W10/20
Inventor 李十中姜立张成明韩娅新陈雪兰
Owner TSINGHUA UNIV
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