Haigh Engineering are experts in waste processing and separation technology using fine particle maceration for biogas plants.
Haigh products are used in anaerobic digestion and biogas processes due to the output of smaller particles sized at 2-3mm and increasing the surface area available for the reaction.
Haigh equipment has been designed with longevity in mind; affording reliability and reducing the potential expense of down time in plant environments. Haigh macerators and liseps are also used to separate liquids and solids, and even solids and packaging – depending on the type, category and source of the collected waste.
Increasing the active surface area available for bacteria to act on is a well understood method of improving and optimising the anaerobic digestion process. Additionally, efficient maceration allows pumping and other subsequent mechanical processes to perform effectively with minimised risks of blockages or failures.
Haigh's range of controlled particle maceration and combined macerator / pumping products deliver a well proven method of processing the input feed into the anaerobic digestion process. By specifying the macerator cutting system hole sizes, the particle sizes can be tuned to the specific needs of the AD and biogas plant, typically from 10mm, down to below 2mm.
High efficiency drives allow the best combination of macerator performance to power consumption.
Within anaerobic digestion and biogas plants, the Haigh Lisep unit consists of a centrifugal dewaterer, removing particles down below 2mm from the process digestate. The remaining solids are fed into an integrated compaction auger which mechanically squeezes the remaining liquid from the solid resulting in an output with up to 40% dry solids content. The liquid portion can then be stored or pumped without risk of blocking pumps or excess solids settling out over time.
The liquid output is an ideal crop fertiliser or for use in any other application where a nutrient rich source is required. The solids are typically used for composting, or where this is not an option due to the digester feed stock, recycling or disposal. As the solids have been compacted, transportation costs are kept to an absolute minimum, making this unit highly cost effective.