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Sewage sludge

Digestate

 

Sewage sludge from waste water treatment plants is a resource that is sometimes difficult to exploit. Spreading it on fields as fertilizer is a way to take advantage of the nutrients, but many are reluctant to use sludge on their land. Covering dumps after long-term storage is another way to use the nutrients for new vegetation. In the future however, the period required to store the sludge before usage is likely to increase.

Through hygienization in QuantorXL®, you increase the possibilities to safely use sludge and achieve a faster, more flexible management. You get a quality compost that can be used for example in a municipality's own park management, or as a raw material in plant soil.

The solid, dried part of the sewage sludge may, after mixing it with structural materials, be composted. Preferably other available waste can be used, such as chipped park waste or dry horse manure that is collected locally. Thereby you create an efficient, complete solution for several different waste streams.

Not only is QuantorXL®  the first composting method that can guarantee hygienization of sludge, the closed, rapid process also minimizes problems with smell. In addition ECSAB provides system for further odour reduction if necessary.



Today most of the biowaste collected by municipalities goes to anaerobic digestion for biogas. The digestion residues remaining after the gas has been extracted (the digestate) may for example be used as a bio-fertilizer. If there is no demand for raw digestate an option is to complement the process with a composting phase to create a product with wider areas of use.

In this case, QuantorXL® does not offer any advantage by the hygienization since this is usually already achieved in the biogas processitself. However, the method is unique by its automated process, compared to other ways of composting. It makes it possible to easily integrate into an existing plant, without creating additional , unnecessary handling

Apart from being used as final step of the biogas process, it can also be used as complement to the biogas plant. If you receive waste less suitable for digestion, such as horse manure, it may be better to treat it separately. The you also have a solution that can be used to treat all types of waste if disruptions occur in the biogas process or you have fluctuations in quantity of waste received in relation to capacity. It is important to have a composting system that ensures hygienization so that the finished material wican be mixed with hygienized residues from the biogas process.

Read more about QuantorXL® and how it works

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