Anaerobic Digester Cleaning Plant

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 which settle in the digester tank, reducing the capacity in the tank and therefore decreasing its efficiency. Not only that, but grit is highly abrasive and causes attrition and wear on downstream processes. This results in the need for regular maintenance and replacement of parts.

Solution

Digester tanks 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. Hengyang's mobile, in-line grit removal technology allows for grit to be removed from the anaerobic digestion processes, without the need to shut digester tanks down. The HENGYANG uses vibrating platform screen technology in a mobile screening & classification system to efficiently remove grit, rag and other troublesome solids from a waste stream.

The HENGYANG can be easily moved around a number of sites if required, facilitating processing in-situ at a variety of locations. This minimises the transport movements required to bring waste material to a processing site.

The HENGYANG mobile solution can be used to screen and dewater material from other tanks including:

sludge holding tanks

primary tanks

storm detention tanks

pumping stations and culverts

Result

Our solution makes tank cleaning more efficient and more cost-effective for operators as they're able to recover more grit without needing to shut the digester tanks off

Maximum dewatering ensures the rag material going to landfill is now drier and easier to manage. The HENGYANG recovers up to 90% of grit can be used in a number of further applications:

nutrient rich soil or composting additive

backfill and pipe bedding

generation of biosolids