Harvest Residue Methane Fermentation for Soil Fertility

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Solution Overview

Problem

Existing methods for processing agricultural harvest residues, such as rice straw and wheat straw, are inefficient and lead to environmental issues like greenhouse gas emissions and air pollution.

Innovation Solution

A resource recycling method that involves collecting harvest residues, storing them in multiple dispersed locations under varying conditions, and then undergoing methane fermentation to produce biogas and fermentation residues, which are returned to the agricultural field as compost or fertilizer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If harvest residues are plowed back into the soil as organic fertilizer, then soil fertility is improved, but greenhouse gas emissions increase due to methane production from anaerobic decomposition

Engineering Contradiction:
Improvesoil fertilityVSAvoidgreenhouse gas emissions
Core Design Contradiction:
Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the harmful methane gas produced during anaerobic decomposition of harvest residues by implementing controlled anaerobic fermentation in fermentation tanks. The methane is collected and utilized as energy through combustion engines, while the fermented residues are applied to soil. This separates the harmful emission aspect from the beneficial fertilizer aspect, eliminating greenhouse gas pollution while maintaining soil fertility improvement.

Inventive Principle:
Principle #2Taking out (Extraction)

2Loss of substance

If harvest residues are incinerated at the agricultural field, then volume reduction is achieved, but air pollution and odor problems occur

Engineering Contradiction:
Improvevolume reductionVSAvoidair pollution
Core Design Contradiction:
Loss of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent converts the previously harmful incineration process into a beneficial energy production process. Instead of open-field burning that causes air pollution, the harvest residues are subjected to controlled anaerobic fermentation to produce methane gas, which is then combusted in a controlled environment to generate electricity. The harmful methane emission is transformed into a useful energy source, while the fermentation residues provide valuable fertilizer, completely eliminating air pollution and odor problems.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If a large amount of harvest residues is collected and stored in a single location, then processing efficiency is improved, but transportation costs and site requirements increase

Engineering Contradiction:
Improveprocessing efficiencyVSAvoidtransportation cost
Core Design Contradiction:
ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the centralized storage system into multiple distributed storage locations across different regions. Each location stores harvest residues locally after collection, eliminating the need for long-distance transportation to a single central facility. The fermentation facilities are also distributed at these locations, allowing local processing of residues. This segmentation maintains processing efficiency by enabling continuous operation at multiple sites while dramatically reducing transportation costs and site requirements.

Inventive Principle:
Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method efficiently utilizes a large amount of harvest residues, reduces farming costs, and minimizes environmental impact by converting residues into valuable energy and fertilizer resources.

Implementation Method 1

an anaerobic treatment step of causing the harvest residues collected in the harvest residue collection step to undergo methane fermentation

Methodology Applied
Scientific EffectMethane fermentation: Anaerobic Digestion

Data Source

PatentUS20250163476A1Resource recycling method and resource recycling management method
Publication Date: 2025.05.22 KUBOTA CORP
  • US20250163476A1 patent drawing
  • US20250163476A1 patent drawing
  • US20250163476A1 patent drawing

AI summary

A resource recycling method that can efficiently utilize a large amount of harvest residues produced in agricultural fields as resources wherein the method includes: a harvest residue collection step of collecting harvest residues produced in an agricultural field; an anaerobic treatment step of causing the harvest residues collected in the harvest residue collection step to undergo methane fermentation; and a returning step of returning fermentation residues produced in the anaerobic treatment step to the agricultural field. The harvest residues collected in the agricultural field are caused to undergo methane fermentation, and the produced methane gas is recovered and effectively utilized as energy, and the fermentation residues are returned to the agricultural field as a compost or fertilizer.