Sustainable OneWorld Technologies C.I.C. (SOWTech)
The Flexigester System is an anaerobic digestion system that can take materials such as animal manures, waste food, human waste and plants and convert them, over a period of several weeks, into natural Biofertiliser and Biogas. The system is delivered in a box, it is small and light, yet it has a capacity of 10 tonnes and above.
Systems distributed in Africa include Flexi Biogas BG5, Simgas GesiShamba, MBSA Biogas Plant.
Designed for small communities and farming groups.
Owning a Flexigester System can turn the user into “business entrepreneur”. Depending on the community needs there may be opportunities to sell any excess biogas or biofertiliser, accept other peoples waste for treatment or even start a service to collect waste.
The system also has the advantage that it can be set up quickly for places such as refugee camps.
On a per demand basis.
Butyl Products Ltd is the sole manufacturer.
DESIGN: The Flexigester is made from butyl rubber which is impervious to both liquids and gases. This stops waste water soaking into the ground and polluting soil and water courses and controls odours from rotting waste.
INSTALLATION: The Flexigester V10 System can be installed in a few hours. A shallow trench (12 m long 1.5 m wide and 0.75 m deep) is lined with the base membrane and the Flexigester body is unrolled into it. The gas pipe is cut to the required length and is used to connect the Flexigester to the Gas pressure regulator and then to the Biogas storage bag using the push and clip fittings provided. The Flexigester is then ready for use.
OPERATION: Waste materials are added to the digester by gravity feed or using a simple roller pump. Two separate input pipes allow different types of waste to be introduced into the Flexigester. The waste may be blended with water prior to addition to make them pourable. The waste materials are not exposed to the atmosphere which prevents flies and vermin living and breeding on them. Once the digester is full, the level is maintained as the Biofertiliser output pipe acts as an overflow. The material that comes out of the digester may either be piped to another location by gravity or held in the Biofertiliser collector depending on the local circumstances. The Biogas collects in the Biogas storage bag and from here it can be piped directly to the kitchen for use.
– FLEXIGESTER BODY:
– – The anaerobic digester for the treatment of waste with 2 inlet pipes, 2 biogas pipes and 2 biofertiliser outlet pipes.
– – Capacity:10t;
– – Length: 10m;
– – Diameter: 1.6m;
– – Material: Butyl rubber
– BIOGAS STORAGE BAG:
– – For the collection and storage of biogas prior to use.
– – Capacity: 3.4m3;
– – Length: 3m;
– – Width: 2m;
– – Material: Butyl rubber
– BIOGAS PRESSURE REGULATOR:
– – To maintain a set pressure in the Flexigester.
– – Size: 40 x 45 cm;
– – Material: PVC
– BIOFERTILISER COLLECTOR:
– – For the collection and storage of biofertiliser prior to use.
– – Size: 120 x 80 47 cm;
– – Material: PVC lined wooden crate
– BASE MEMBRANE:
– – To line the trench under the Flexigester to protect it from sharp objects.
– – Size: 4 x 2 m 6 off;
– – Material: Geotextile
– GAS PIPE AND FITTINGS:
– – To connect the Flexigester to the Biogas Pressure Regulator and storage bag.
– – Length: 10m
– COMPLETE SYSTEM:
– – Packed dimensions: 120 x 80 x 47 cm;
– – No of crates: 1;
– – Approx. weight: 135 kg
Process: Flexigester systems perform anaerobic digestions. Anaerobic digestion is the breakdown of organic material by micro-organisms in the absence of oxygen. It produces biogas, a methane-rich gas that also contains carbon dioxide with trace amounts of other gases; and digestate, a source of nutrients that can be used as a fertilizer. The digestion process begins with bacterial hydrolysis of the input material in order to break organic polymers into smaller molecules that finally become methane and carbon dioxide after acidogenesis and methanogenesis.
Technical support provided on field.
The Flexigester is made from Butyl, which is a resilient and robust material, and which can be maintained with simple hand tools. Butyl products have been in use for periods well in excess of 10 years in tropical and subtropical.
Minimum retention time: 30 days
Biogas output: up to 8 m3/day, equivalent to up to 9-17 kg wood/day
There are some potential dangers to running the biogas plant: noise, hazardous waste material disposal, etc. Adequate ventilation, appropriate precautions, good work practices, and adequate personal protective equipment will minimize the dangers associated with biogas.
The Flexigester is available in a variety of sizes from 10 to 80 m3 allowing it to be used in a variety of different situations.
Flexigester distributes another product, Flexigester Sewage Isolation Bag (SIB), designed for the containment, control and treatment of sewage in temporary camps. It is an alternative to open sewage pits / lagoons to hold sewage waste in temporary camps. It captures the raw sewage direct from pour-flush / flush latrines and isolates it from the environment thereby preventing smells, fly infestation and the spread of disease.
Expert advisors have indicated that flexible biogas plants are much cheaper than masonry plants, but have shorter lifetimes. They have expressed concerns about butyl rubber digesters, as their price is seen as high compared to other types.
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