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All about the production and use of biogas, anaerobic digesters and similar technologies

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farm size Biogas Plant

Puxin Biogas Plant

Puxin family size and medium size biogas systems.

Biog Ltd – Breivika Industrivei 57 – 6018 Ålesund – Norway – Tel: 004797521288 – Email:

Biog & Puxin Biogas Plants

We have our superiority in consummate hydraulic pressure biogas system and convenient construction solutions, as we have developed a new type gas plant featuring easy operation, easy maintenance, fast initial gas producing. Our plants are well reputed in the biogas industry with durable quality of products, excellent safety and the low cost.

The following are the biogas system.

1. Puxin medium size biogas system: The medium size biogas system is composed of one or a group of 100 m3 biogas plants formed into a unit, the pipes system, the gas purification system and the appliances or electricity generator. The medium size biogas system is mainly applied to the livestock (pig, cow, etc.) plants to treat the waste, or applied to public buildings (hotel, apartment, etc.) to treat sewage and organic food waste.

2. Puxin family size biogas system: The family size biogas system is composed of one or several 10 m3 biogas plants formed into a unit, the pipe system, the gas purification devices and the appliances. The family size biogas system is mainly applied to family house to treat sewage and organic food waste.

For those two type biogas systems we sell all the equipments and products needed to build the biogas system to our customers, train the technicians for them, and we or our customers can build the biogas application system themselves. Our products for building a biogas plant include: the steel mould that is equipment used to build the concrete digester of the 10m3 biogas plant, the glass fiber gasholder that is a component of the 10m3 Puxin biogas plant, the pipeline, the biogas appliances (stove, water heater, rice cooker, lamp etc.) and small power biogas generators.

The steel mould is composed of a number of steel mounding boards. By using a steel mould a 6 or 10 m3 biogas digester can be build in two days, or 150 in a year. The steel mould is reusable and can be used over 2000 times and lasts over ten years.

The glass fiber reinforced plastic gasholder is 1.0-1.2 m3 that is one of the main components of the Puxin biogas plant, and it can last over 10 years.

The Structure

Puxin Biogas Plant is of the hydraulic pressure biogas plant type, and is composed of a concrete digester and a glass fibre reinforced plastic gasholder. The digester has a capacity of 6 or 10 cubic meters, and is constituted by a stomach, a neck an inlet and an outlet. The gasholder is 1.6 m in diameter, 1 or 1.2 cubic meter in capacity. The gasholder is installed within the digester neck, fixed by a component; the gasholder and the digester are sealed up with water.

Comparing with the traditional fixed dome type hydraulic Biogas plant, Puxin Biogas Digester has the following distinct advantages:

Easy to build and 100% success rate: The construction of Puxin Biogas Plant is exempt from the difficult airtight craft, so the technical difficulty is greatly decreased, and the construction perriod is greatly shortened. To build a Puxin Biogas Digester successfully, the constructers are only required to master how to assemble and disassemble the steel mould. Any workman can learn to build Puxin Biogas Digester within a day and with 100% success rate.

Part one Preparation

Choosing location

The digester should be constructed near and below the lavatory and hog pen or cowshed, so that the waste can flow into the digester automatically.

Step 2
Preparing construction materials

Cement (grade above 325) 1200kgs; Sand: 3.0m³; Scree : 3.0m³; Brick(60×120×240mm)200 pieces;
Reinforced steel bar(?6-8mm)20kg.%%c150MM PVC pipe (L1350MM 1pc, L1250MM 1pc

Step 1 Dig a hole in the ground (diameter 3.0m and depth 3.1m)
Step 2 Cast the basement (thickness 10cm)
Step 3 Assemble the stomach mould
Step 4 Assemble the vault mould Install the top and bottom rings
Step 5 Cast the digester stomach
Attention: Make the mould soggy before casting. Cast evenly and symmetrically.
Step 7 Assemble the neck outer mould
Attention: The neck outer mould is composed of two parts (upper and lower),
The upper and lower must be connected in dislocation.
Step 8 Cast the digester neck
Attention: A hole for the gas pipe pass through, and three cavities used to fix the gas holder must be left in the neck of the digester.
Step 8
Step 9 Disassemble the mould
Attention: The neck mould is allowed to disassemble, only after at least 24 hours of the finish of the casting. First disassemble the neck outer mould, and then disassemble the neck inner mould. The vault and stomach mould are to be disassembled, after at least 48 hours of the finish of the casting. First disassemble the vault mould, and then disassemble the stomach mould.

Step 10 Install the inlet and outlet pipes
Attention: The joints between the stomach and the inlet and outlet pipe must be sealed with cement to stop water leaking.

Step 11 Build the inlet and outlet
Attention: The inlet and outlet is build with bricks, and the faces inside the inlet and
outlet must be covered with a layer of cement of 1CM thickness. The inlet is at least 20CM higher than the outlet, so that the waste can automatically flow into the digester through the inlet and flow out from the digester through the outlet by gravity.

Step 12 Paint the digester
Paint the face inside the digester over with liquid cement 1-2 times made sure there is no small hole on the face.

Step 13 Install the gas pipe system and the appliances

Part three checking

Step 1
Water leaking test
After three days of the completion of the digester, fill the digester with water, if the digester is leaking, get the water out from the digester, find out the leaks and seal them with cement.

Step 2
Gas leaking test
Fix the gasholder in the digester neck, the pump air into the gasholder until the
gasholder is full of air. If there is no air bubble from the gasholder, the gasholder is OK. If the gasholder is leaking, find out the leaks and seal them with resin glue inside the gasholder.

Biogas appliances and fittings

Double burner biogas stove
Large burner Biogas stove ?For restaurant use?
Biogas rice cooker
Pressure gage
Biogas lamp
Biogas generator (600W)
Flow meter
Biogas Valve
Desulpharize ?family-size?
Big size desulpharize (PX-?)
Big size desulpharize (PX-?)
Big size dehydration

Why our customers choose Puxin Biogas Plants

They are suitable for vast rapid construction: The steel mould and the glass fibre reinforced plastic gasholder can be mass-produced in factories, so that any place or country can build the Puxin Biogas Plant on a vast scale

Convenient to replace solid fermentation material; suitable for straw and other solid organic material: The gasholder is only 30 kg in weight, and can eliminate the atmospheric pressure. So it is effortless to take out the gasholder from the digester, and easy to replace solid material through the digester neck (1.5m in diameter).

Easy to maintain and a long service life: When the gasholder is leaking, the leak can be found immediately, and can be repaired on ground. The concrete digester can last over 30 years ? and the glass fibre reinforced plastic gasholder over 10 years. When the gasholder is worn out, a new one is replaceable, so that the biogas plant can last over 30 years

Excellent airtight function and the high rate of biogas production: The glass fibre reinforced plastic gasholder sealed up by water is 100% airtight. Since replacing the fermentation material is easy, the digester can sustain sufficient fermentation material, so can the biogas plant have a high rate of biogas production.

Excellent safety and easy operation: When the gasholder is taken out, no biogas is left in the digester. The digester neck (1.5m in diameter) is large enough to keep sufficient fresh air in the digester. So it is safe both to repair the digester inside and to replace fermentation material. When the gas pressure reaches its limit, there will be automatic gas leak, hence no damage to the plant.

If you would like to know more about Puxin Biogas Plants, please do not hesitate to contact us.
Biog Ltd – Breivika Industrivei 57 – 6018 Ålesund – Norway – Tel: 004797521288 – Email:

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