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Eco-Solids Process wins battle against SAS

Posted: Friday 13th August 2010

Newly launched in the UK and Europe, the Eco-Solids Process is a continuous stabilisation process for treating all types of sewage sludge, including sludges that contain a proportion of hard to handle Surplus/Secondary Activated Sludge (SAS).

Available exclusively from Eco-Solids International, the process not only produces an enhanced treated biosolid and income-generating product (which exceeds European and U S regulatory requirements), but results in significant reductions in sludge volume, volatile solids (VS), total nitrogen and water extractable phosphates. Complete inactivation of microbiological activity is also achieved, as well as an improved percentage of solids of the product.

Already a proven technology in the U S, the small footprint Eco-Solids Process is readily adaptable to any operating sequence, commensurate with the dewatering cycle and availability of cake from centrifuges or belt presses. Individual systems, including mobile units, can be tailored to meet specific requirements at each site, and can include dewatering equipment.

From sludge volumes ranging from 2,500kg/hr up to 10,000kg/hr (wet cake), a single Eco-Solids Process unit ensures that a proportion of the treated material is recycled back into the feed hopper along with the other raw materials at the start of the process. This recycling increases the temperature of the raw feed material and can significantly reduce the amount of calcium oxide required in the process, which in turn means lower operating costs compared with conventional lime-based processes.

The result at the end of the process is a non-malodorous enhanced treated (Class A/EQ) biosolid, called Eco-Solid, which is placed into a container for disposal off-site. Being highly stable and low in odour, the Eco-Solid product does not require silo storage, giving further CAPEX savings for the overall scheme.

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