The floating cover of digester is made of reinforced PVC membrane or coated fabric. The edges are double-sided welded, crossed by iron wire or plastic tube to be fixed at bottom of digester.
Household type digester is always in the dimensions of diameter 1~3 m with height 1~1.5 m, cylinder or rectangular shaped; Industrial type is 3~4m width, arch height at 1~1.6m and length at 4~15m, single or multiple numbers in parallel.
Characteristics of floating soft digester:
1. Excellent heat absorption
Fermentation temperature is the key factor, at least 15 degree.C required by this technology. This modified membrane could absorb heat from sunshine for improvement of biogas production.
2, Strong pressure resistance
For digester of reinforced PVC membrane, operation pressure could be up to 3 kPa; For PVC coated fabric, it can reach 8 kPa; What's more that the digester is equipped with pressure protecting mechanism.
3, Good air tightness
The floating cover is hot-welded by multi-functional high frequency welding machine, with perfect performance of air tightness, in line with the requirements of anaerobic fermentation.
4, Perfect stretchability
The reinforced PVC membrane is flexible, enables floating cover to expand about 10% larger.
5, Strong weather appliability
The membrane chose is a kind of modified PVC alloy material, with good stability, can be antifreeze (-25 Degree.C) and anti-exposure(+50 Degree.C). It is also acid&alkali resistance, lightning protection, earthquake resistance and tear resistance. Life-time can reach 12~15 years.
6, Easy operation&maintenance
It is easy to learn and master the complete processes. Short time of training enables worker to achieve a comprehensive grasp how to operate and maintain the whole digester.
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