Resource utilization method for combined production of biogas and cultivation matrix through utilizing tobacco stalk fermentation

A cultivation substrate and resource utilization technology is applied in the field of using biomass waste to produce biogas and cultivation substrates. And the effect of high transportation cost and high labor consumption

Inactive Publication Date: 2013-01-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Unstable production raw materials: At present, conventional production raw materials mainly include crop straw, animal manure, human excrement, domestic waste, etc., which have extensive production, difficult control of nutrient content, unstable raw material sources, different product properties, and easy transmission of pathogenic bacteria. Problems such as parasites and pests
[0006] 2. Scattered production raw materials: At present, conventional production raw materials are mostly scattered in fields, farmers, and various living groups, which is difficult to concentrate and is not conducive to large-scale production
[0007] 3. The cost of raw materials is high: the centralized collection, acquisition and transportation of scattered raw materials will invest a lot of manpower and material resources, which will increase production costs
[0008] 4. The physical and chemical properties of raw materials are not suitable: the existing raw materials have different particle sizes, lengths, dryness and wetness, and the carbon-nitrogen ratio varies greatly
Hundreds of thousands of tons of tobacco stem waste are produced every year in my country's tobacco processing. Due to ineffective utilization, a large amount of inventory is backlogged, or incinerated, landfilled and destroyed, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 10,000kg of waste tobacco stems produced by the threshing and re-baking plant, add 2,000kg of swamp sludge and 8,000kg of water, mix well and send them to the biogas digester, and stack them for 2-4 days. When the temperature of the material rises to 40-60°C, add water to make The solid content of the material is 10%, and then the tank is sealed for fermentation. After 2 to 5 days after sealing, you can ignite and test the gas. Biogas is purified to make clean fuel or used for power generation. After 40 days of fermentation, the gas production decreased and feeding was started. The raw material concentration is controlled to be 8% to 10%, and the feeding amount is about 0.8 kg of dry tobacco stem per cubic meter of biogas digester per day. At the same time, start to discharge; the volume of the discharge is equivalent to the volume of the feed. In this way, the system can maintain long-term equilibrium and stable gas production. It has been measured that the ga...

Embodiment 2

[0054] Carry out biogas fermentation according to the method of embodiment one. After one year of stable operation of the system, the feeding is stopped, and a major refueling is carried out after 20 days. Take out 3 / 4 of the old material from the biogas digester, send it to the solid-liquid separator to separate the tobacco stem residue and biogas slurry; pump the biogas slurry back to the fermentation tank for recycling, and then send 7500kg of tobacco stem new material into the fermentation tank, and add an appropriate amount The water, then seal the pond, and carry out the next round of fermentation operation. Dry the separated tobacco stem biogas residue to a moisture content of 25%, and send it to a soft silk machine to disperse it. The rotating speed of the knife (hammer) is 1000-1500 rpm (without a sieve plate), and a fluffy fiber shape is obtained. Tobacco stem cultivation substrate.

[0055] Part of the tobacco stem cultivation substrate is evenly mixed with natura...

Embodiment 3

[0058] Equip a biogas dry fermentation system near the threshing and redrying plant. Send the waste tobacco stems produced by the threshing and redrying plant into the raw material premixing device, and add 20% of the swamp sludge (the last batch of tobacco stems and biogas residues can also be used) and 2.15 times the weight of water, so that the solid content of the material is About 30%. The uniformly mixed materials are sent to the biogas fermentation tank for dry fermentation, and the fermentation temperature is maintained at 35-55°C. After 3 days of sealed fermentation, the gas production gradually increased. During the second to third months of fermentation, the gas production was maintained at the peak. During the 4th to 6th month of fermentation, the gas production gradually increased and decreased to a critical value, completing a fermentation cycle. The generated biogas is purified by the purification device and then input to the generator set for power generatio...

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Abstract

The invention provides a resource utilization method for the combined production of a biogas and a cultivation matrix through utilizing tobacco stalk fermentation. The method comprises the following steps: carrying out anaerobic fermentation of a main fermentation raw material which is waste tobacco stalks generated in the tobacco threshing redrying line to produce the biogas; carrying out solid-liquid separation of a biogas slurry and the tobacco stalks to obtain a tobacco stalk biogas residue and a biogas slurry; purifying the biogas to prepare clean fuels or to be used for electricity generation to provide partial energy for a plant area; and decomposing the tobacco stalk biogas residue, and carrying out dry molding to prepare the cultivation matrix, wherein the biogas slurry returns to a fermentation system to be recycled or to be used as a liquid organic fertilizer. The method provided by the invention has the advantages of simple production operation, concentrated and stable raw material, scale production benefiting, low production cost, realization of no pollution, zero discharge and cycle utilization of waste tobacco stalk resources of a threshing redrying plant, and generation of good economic, ecological and social benefits.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of agricultural biomass waste, in particular to the technology of producing methane and cultivation substrate by using biomass waste. In more detail, it relates to a resource utilization method for co-producing biogas and cultivation substrate by fermentation of waste tobacco stems. Background technique [0002] In the world of the 21st century, the problem of energy shortage is increasing day by day, and energy development has become an important development strategy of all countries. Biomass fermentation produces biogas (biogas). Biogas fermentation is one of the most important technologies for biomass energy conversion. It can effectively process organic waste, produce fuel biogas and fertilizer, and play an important role in solving rural energy consumption problems, improving rural environmental sanitation, and cleaning up industrial pollutants. Biomass that can be convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C05F5/00C05F7/00C05G3/00F02B43/08F02B63/04
CPCY02T10/32Y02E50/343Y02A40/20Y02E50/30Y02T10/30Y02W30/40
Inventor 朱大恒席宇朱润琪
Owner ZHENGZHOU UNIV
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