CUSTOM BUILT FOR YOUR FEEDSTOCK
Moore Biosystems do not adopt a ‘one size fits all’ approach to designing a biogas plant. We recognise that no two customers are the same and no two plants are the same. Each plant is designed and tailored for your requirements, including site layout, existing infrastructure and facilities, intended feedstock, customer spec preferences and future proofing.
Often we are asked what feedstock our plant uses. The answer is that we design the plant around the feedstock that is available not the other way around. We provide plants employing technology used in Denmark where many combinations of feedstock including by-product waste from creamery, bakery, drinks industry, abattoir in addition to slurry and energy crops such as grass, maize and sugar beet. The plant can run with a lot of slurry or no slurry at all.
A PRE-TREATMENT SYSTEM
A pre-treatment process is a key process often undervalued and therefore neglected in plant design and is an important process adopted in the Moore Biosystems plant. This process acts to combine, mix and homogenise the mixture before entering the digester. It also reduces particle size of the feedstock so that all particles are in small pieces and are uniform improving speed and consistency of digestion. The pre-treatment process removes considerable mixing responsibility from the digester tank making mixing in the tank easier and gas production more efficient. A special mixer is employed that prevents the formation of floating layers and crusts. It also aids biological stability in the digester and reduces fluctuations caused by feedstock straights entering the digester. Different levels of pre-treatment can be engineered into the plant to also aid hydrolysis (hydrolysis is the first step in the methane production process) including pre-heating. Having a pre-treatment is particularly effective at dealing with a grass silage system.
In UK and Ireland grass silage represents the best energy-crop for biogas production. If made and used correctly grass silage can be an extremely good biogas feedstock. However, grass silage is a bigger processing challenge than maize silage and many considerations need to be made when using grass silage.
Firstly, if grass silage is to be used in a biogas plant note that the process begins in the field! Different growing and cutting practises should be adopted than those for cattle feeding. Certain species and varieties can also be more appropriate with high D-value being of primary importance. Moore Biosystems can advise and provide professional agronomy support from an in house qualified grassland agronomist for the successful growing of grass-to-gas silage including seed mixture recommendations.
Appropriate pre-treatment, chopping and mixing considerations must also be made and we design each plant with that in mind.