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## Water SA

*versão On-line* ISSN 0378-4738

#### Resumo

POLASEK, P. **Significance and determination of fraction of non-separable particles of impurities in water purification**.* Water SA* [online]. 2014, vol.40, n.1, pp. 89-95. ISSN 0378-4738.

The method to determine the quantity of non-separable particles in water, together with the calculations for the determination of the conditions of centrifugation under which the quantity of the non-separable particles can be determined, are dealt with in this paper. It is shown that for the determination of the quantity of non-separable particles it is beneficial to replace sedimentation in a gravity field with sedimentation in a centrifugal field. Reduction in the quantity of non-separable particles is characterised by the degree of destabilisation δ*,* which is proportional to the efficiency of the purification process. The development of separable aggregates is characterised by the degree of aggregation α* _{A}* which is proportional to the aggregation and separation efficiency of the system. The degree of destabilisation δ corresponds to the collision frequency factor α in the Smoluchowski equation for the perikinetic coagulation. The degree of aggregation α

*corresponds to the collision frequency factor α*

_{A}_{o}in the Smoluchowski equation for orthokinetic coagulation.

**Palavras-chave
:
**non-separable particles; number of non-separable particles; degree of destabilisation; degree of aggregation; centrifugation; collision frequeh as hydrncy factors.