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| Sludge treatment |
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The treatment of washing gases, waste and drinking water generate sludge. When the sludge is dried out using a mechanical process, lime can be used, with various objectives, in the following phases:
Before filtering:
Conditioning is carried out by adding milk of lime to the liquid sludge, producing the following effects:
- Coagulation of solids, facilitating the dehydration process (a physical operation that aims to reduce the volume of sludge by concentration, reducing as far as possible its content and humidity).
- Increase in the size and weight of the “flakes”, as well as the dry material content.
- Improvement in the friability of the sludge.
- Hygienisation: blocking fermentation and eliminating pathogenic organisms by increasing the pH.
After filtering:
The drying and stabilisation effect is achieved by adding quicklime to the sludge with the result of:
- An increase in the dry material content due to the increase in temperature, caused by the exothermic reaction created by the union of the CaO molecule with the H2O, facilitating the drying-out of the sludge.
- Hygienisating the sludge by increasing the pH, reducing its acidity. |
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