on video I turn a trash can into a portable LPG gas

 I turn a trash can into a portable LPG gas cooker

Introduction

A biodigester is a technical solution for recovering organic waste used to produce combustible gas (biogas) and fertilizer (digestate). The particularity of the biodigester is that the degradation is carried out by bacteria in an oxygen-deprived environment, we speak of anaerobic fermentation.

Biogas is a gas mixture containing mainly methane, it can be used to supply a gas stove or boiler burner or as fuel for engines.

The methanogenic fermentation that occurs in the biodigester exists in nature. This is, for example, what happens in marshes when organic matter decomposes underwater. Will-o'-the-wisps are small biogas flares.

The domestication of biogas dates back to the beginning of the 19th century and the number and variety of biodigesters have continued to grow ever since. They are particularly present in the developing countries of the tropical belt where small farmers are self-sufficient in energy thanks to their production of gas with their organic waste. Heat being an important catalyst of fermentation, in these latitudes, small units are economically interesting.

In France and in certain countries, the cost of energy being very low compared to that of labour, few small digesters exist. However, many industrial installations equip wastewater treatment plants and large farms.

There are several types of biodigesters, continuous or discontinuous, and with production ranges depending on the temperature (psychrophilic: 15-25°C, mesophilic: 25-45°C or thermophilic: 45 – 65°C). We are going to study continuous mesophilic biodigesters at 38°C, the most widely used solutions in temperate zones.

  The main characteristic of this system is its resemblance to a digestive system. Like him, he cultivates bacteria, needs a certain temperature to be effective and receives regular food.

In compost, in an aerobic environment, the decomposition of organic matter leads to the formation of gases (H2S, H2, NH3) and significant heat production. Only decomposition in the absence of air leads to the formation of methane. This is one of the reasons why fermentation takes place in an airtight tank.

In this tutorial we will study the different constituent elements of a biodigester (material circuit and gas circuit) and how to use it.

This documentation produced with the Picojoule association traces the manufacture of one of their micro-methanization prototypes, it does not allow autonomy in cooking gas but is a good introduction to biodigestion. Hélie Marchand's semi-buried digester in Madagascar has a larger capacity: Biodigester

The explanations are largely inspired by the work of Bernard LAGRANGE in his books Biomethane 1 and 2, which we highly recommend!

This work is free and open, do not hesitate to clarify it and complete it with your knowledge and experience.

 I turn a trash can into a portable LPG gas cooker

Introduction

A biodigester is a technical solution for recovering organic waste used to produce combustible gas (biogas) and fertilizer (digestate). The particularity of the biodigester is that the degradation is carried out by bacteria in an oxygen-deprived environment, we speak of anaerobic fermentation.

Biogas is a gas mixture containing mainly methane, it can be used to supply a gas stove or boiler burner or as fuel for engines.

The methanogenic fermentation that occurs in the biodigester exists in nature. This is, for example, what happens in marshes when organic matter decomposes underwater. Will-o'-the-wisps are small biogas flares.

The domestication of biogas dates back to the beginning of the 19th century and the number and variety of biodigesters have continued to grow ever since. They are particularly present in the developing countries of the tropical belt where small farmers are self-sufficient in energy thanks to their production of gas with their organic waste. Heat being an important catalyst of fermentation, in these latitudes, small units are economically interesting.

In France and in certain countries, the cost of energy being very low compared to that of labour, few small digesters exist. However, many industrial installations equip wastewater treatment plants and large farms.

There are several types of biodigesters, continuous or discontinuous, and with production ranges depending on the temperature (psychrophilic: 15-25°C, mesophilic: 25-45°C or thermophilic: 45 – 65°C). We are going to study continuous mesophilic biodigesters at 38°C, the most widely used solutions in temperate zones.

  The main characteristic of this system is its resemblance to a digestive system. Like him, he cultivates bacteria, needs a certain temperature to be effective and receives regular food.

In compost, in an aerobic environment, the decomposition of organic matter leads to the formation of gases (H2S, H2, NH3) and significant heat production. Only decomposition in the absence of air leads to the formation of methane. This is one of the reasons why fermentation takes place in an airtight tank.

In this tutorial we will study the different constituent elements of a biodigester (material circuit and gas circuit) and how to use it.

This documentation produced with the Picojoule association traces the manufacture of one of their micro-methanization prototypes, it does not allow autonomy in cooking gas but is a good introduction to biodigestion. Hélie Marchand's semi-buried digester in Madagascar has a larger capacity: Biodigester

The explanations are largely inspired by the work of Bernard LAGRANGE in his books Biomethane 1 and 2, which we highly recommend!

This work is free and open, do not hesitate to clarify it and complete it with your knowledge and experience.