Expanded clay containing sludge from the filtration process and treatment of water for human consumption

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Patent Details

Publication Number
PT102856
Priority Date
2002-10-17
Publication Date
2004-04-30
International Patent Classification
C02F11/00

Figures

figura
View of unfired (left) and fired (right) samples.

Abstract

The present invention relates to the use of sludge generated in the filtration process and treatment of water for human consumption, in expanded clay formulations.
The proper control of the operation of the filtration system and water treatment ensures reasonable consistency of properties, in terms of chemical composition and particle size distribution (generally below 0.2 mm).
The sludge has a moisture content greater than 50%, which is almost entirely removed by drying. However, it can be used as it is processed.
Formulations containing sludge amounts up to 25% (by weight), were tested.
Keeping unchanged normal manufacturing conditions, products with functional properties similar to their counterparts are obtained without the waste addition.
This solution also presents environmental added value, translated in the recycling of waste as raw material, thus saving significant natural resources.

Innovative aspects & main advantages

The present invention relates to the incorporation of sludge generated by the process of potable water filtration and clarification (WS) in formulations based on clay minerals and used to produce lightweight aggregates. Maximum incorporation rates reached 25 wt%, without visible and functional negative impact in the properties of the final product or in the running processing conditions. This solution also presents environmental advantages, translated in the recycling of an abundant inert waste that is currently landfilled.

Applications

The main application of this invention (the potential commercial/industrial sectors) is focused on the producers of sludge (as an alternative to landfill) and to lightweight producers. End users of the novel product are mortar and concrete producers.

Inventors

Batista, João

Our Inventors

foto João António Labrincha Baptista

João António Labrincha Baptista

Full professor

Applicant

Universidade de Aveiro

Groups Involved

G4 - Renewable Materials and Circular Economy

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