How long does a 6 cubic meter tank ferment biogas last?

Biogas fermentation, also known as anaerobic digestion, anaerobic fermentation and methane fermentation, refers to the complex biochemical process in which organic substances (such as human, livestock and poultry manure, straw, weeds, etc.) are metabolized by various microorganisms with different functions under certain moisture, temperature and anaerobic conditions, and finally form mixed gases such as methane and carbon dioxide (biogas).

Biogas fermentation is a complex microbiological process, and only by understanding the role and activity of various microorganisms in this process can biogas fermentation be established on a scientific basis. Only when there are a large number of biogas microorganisms and the microorganisms of various groups get the best growth conditions, all kinds of organic raw materials will be converted into biogas under the action of microorganisms.

The sufficient gas production time of biogas is determined as follows: 1. The volume of the biogas fermentation tank; 2. Biogas fermentation raw materials; 3. Biogas fermentation strains; 4. pH value of biogas fermentation broth; 5. The temperature in the biogas digester.

It needs to be calculated according to the specific shape.

If you want to know the shape and size of the fermenter, then you need to know its height and bottom area. Generally speaking, the fermenter has different shapes such as cylindrical, conical, spherical, etc., assuming that the fermenter is cylindrical, then its volume is equal to the bottom area multiplied by the height, i.e., v=pi r 2 h, where r is the radius and h is the height.

If you know the radius and height of the fermenter, then you can calculate its volume using this formula. For example, if the radius is 1 meter and the height is meters, then the volume is v=pi *1 2 *, and if you know the volume and radius of the fermenter, then you can use this formula to calculate its height. For example, if the volume is 20 cubic meters and the radius is 1 meter, then the height is h=v pi r2 =20 pi *1 2 (m).

Kilogram. The main component of biogas is methane, and the density of methane in the standard condition (1 standard atmosphere 20) is kilograms per cubic meter, so the storage weight of 20 cubic meters of biogas tank = 20 kilograms.

So a 20 cubic meter biogas tank can store kilograms of gas.

The daily gas production of 100 cubic meters of biogas digester is about 20 cubic meters.

Biogas contains a variety of gas components, the main component being methane (CH4). The process by which biogas bacteria decompose organic matter to produce biogas is called biogas fermentation. According to the role of various types of bacteria in the biogas fermentation process, biogas bacteria can be divided into two categories.

The first type of bacteria is called decomposers, which are used to break down complex organic matter into simple organic matter and carbon dioxide (CO2). Among them, there are those who specialize in breaking down cellulose, called fibrolytic bacteria; There are those that specialize in decomposing proteins, which are called proteolytic bacteria; There are those that specialize in decomposing fat, called lipolytic bacteria;

The second type of bacteria is called methane-containing bacteria, commonly known as methane bacteria, which oxidizes or reduces simple organic matter and carbon dioxide to methane.

Therefore, the process of turning organic matter into biogas is like the two processes of producing a product in a factory: first, the bacteria decompose and process complex organic matter such as manure, straw, and weeds into semi-finished products – compounds with simple structures; Then there's the methane bacteria that process simple compounds into products – methane.

The hydraulic biogas digester type has the following advantages:

The structure of the pool has good mechanical performance, and makes full use of the bearing capacity of the soil, so it saves labor and materials, and the cost is relatively low.

It is suitable for filling a variety of fermentation raw materials, especially a large number of crop straws, which is very beneficial to rural fertilizer.

In order to facilitate frequent feeding, toilets and pigsties can be built on top of the digester, and the manure can be cleaned into the tank at any time.

The biogas digester is in contact with the soil all around, which has a certain effect on the insulation of the pond body.

There are also some disadvantages of the hydraulic biogas digester type, the main ones are:

Because the air pressure varies repeatedly and generally varies between 4 16 kPa (i.e. 40 160 cm Hg). This has an adverse effect on the strength of the pool and the stability and improvement of the combustion efficiency of lamps and stoves.

Because there is no stirring device, the scum in the pool is easy to crust, and it is difficult to crush, so the utilization rate of fermentation raw materials is not high, and the gas production rate of the pool volume (that is, the gas production of one day and night per cubic meter of pool volume) is low, and the general gas production rate is only about 3 meters per day.

Because the diameter of the movable cover can not be increased, it is difficult to discharge large materials for the biogas digester with fermentation raw materials based on straw. Therefore, it is best to use discharging machinery when discharging.

If it is a biogas digester at room temperature, it can produce up to 35 cubic meters of biogas.

It is strictly forbidden to put highly toxic pesticides, various fungicides and inhibitors that have an impact on the biogas fermentation process into the biogas digester, so as not to destroy the normal fermentation or even stop gas production. If this happens, the fermentation broth in the tank should be completely removed, rinsed with clean water, and re-fed to start. It is forbidden to put calcium carbide into the pool so as not to kill the biogas fermentation bacteria in the pool and cause accidents.

Some agricultural and sideline products, such as rapeseed cake (oil cake), cottonseed cake, bone meal, superphosphate, etc., are easy to produce toxic gas - phosphine trihydrogen, so it is not suitable to enter the pool in large quantities. Strictly prevent surface water (including rainwater and ditch water) and eaves water from flowing into the biogas digester, flooding the gas storage room, diluting the concentration, reducing the pool temperature, and affecting gas production.