Sludge treatment: thickening and dewatering


In both the biological and physico-chemical wastewater treatment there is (excess of) sludge generated which has to be separated from the treated waste water in order to be subsequently removed from the system.

The disposal of sludge is a major operating cost and includes transportation and processing. The lower the dry matter content of this sludge the more there is to be paid for the drainage of water. In addition the lowering of the water content of the sludge may be a requirement for transport, incineration, composting, odor removal or from decay.

In order to significantly reduce the cost of sludge disposal sludge thickening is needed. In many cases this is preferable prior to extensive sludge thickening, sludge dewatering, and / or sludge drying. Various properties of the sludge such as the organic matter or heavy metal content, shear stress and free water content determines which technique is most appropriate in order to keep the overall costs low while keeping the reliability high.

Schedule sludge treatment

Approach Trevi

Trevi initially aims to minimize the sludge production. For this we look both to a reduction of the pollution load from the production as well as optimization of the water treatment plant (load, chemical use). We then investigate in function of the amount and type of sludge if there's an economic advantage to be gained via sludge thickening, sludge dewatering and sludge drying, and if so by what technique.

Possible techniques sludge thickening:

Possible techniques slude dewatering:

Possible technique sludge drying: