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Anaerobic Digestion (AD) is widely used in the UK for the treatment of sewage sludge and the recycling of food waste.
AD is a natural process during which micro-organisms break down organic matter into biogas and bio fertiliser. AD can be used for industrial or domestic purposes to reduce the quantities of sludge or food waste sent to landfill. The biogas produced can be used to generate heat and/or electric energy.
Grit is a major problem within anaerobic digestion.This type of material can include eggshells, bone lime, ash, glass and various other inert high-density materials. This grit, settles in the digester, reducing the capacity in the tank and therefore decreasing the digester’s efficiency.
Not only that but grit causes significant damage to PD pumps, rotors, stators, decanters and various other parts downstream.
Digesters require regular cleaning to increase the retention time of bio-solids in the tank as well as reduce the costs of heating it. Removing grit increases digestion and the life of the sludge pumps and other parts.
That being said, cleanouts can be both dangerous and costly. In-line grit-removal technology allows for grit to be removed from the AD processes, without the need to shut down.
Digester downtime normally takes between 20-40 days, meaning a significant loss in productivity. However, in-line technology removes this need, creating consistent efficiency across the AD processes. Our cyclone classification and high-frequency vibrating screens are used to prevent grit settling, and ensure the highest efficiency in AD processes.