The document summarizes a study on cassava starch separation. It found that the concentration of slurry in settling channels during processing was typically between 0.1-6% and that discrete particle settling predominated for particles between 6.7-8.8 um, which were discharged into local water bodies and caused environmental problems.

2. Cassava Starch Separation
The parts:
-Background
-Purpose ando focus
-Methods
-Results
-Conclusions
Abstract: Cassava Starch Separation
Background:
The production of the cassava starch in Colombia comes
mainly from the nothern region of the Cauca
Departament in small agricultural industries know as
“rallanderias”, in wichi the settling of the slurry accurs in
channels.

3. Purpose and focus
It is important to evaluate the
sedimentation process performed in
rectangular channels (0.3 high; 0.4
wide; 165 m long), wich are generally
used in the region.

4. Methods
Two main components were evaluated:
determination of the change in the
concentration of the slurry entering the
settling zone and determination of the particle
size distribution in the settling zone.

5. Results
It was found that the concentracion of the
slurry during strainer operation was between
0.1 to 6% most of the time; the settling of
discrete particles, for wich to Stokes Law may
be applied, predominated.

6. Conclusions
Particles between 6.7 to 8.8 um were not
retained and were discharged into local bodies
of water, generating environmental problems

7. • Background
In Spain young people have their first
sexual intercourse at an earlier age than in
other countries.
Purpose and focus
Sexual practices and methods of protection
are analyzed depending on the age of sexual
debut among spanis adolescents who are
sexually experienced. The mean age was
15,9 years.

8. Methods
The early sexual debut
group reported further
mutual masturbation,
original intercourse and
oral sex with a higher
number of sexual patners
than the rest.

9. Results
Sexual debut before 15 years
old was associated with
increased risk of sexual
infections, deficit in condom
use and increased sexual
expore.
Conclusions
The findings of this estudy
suggest that the age of sexual
debut has implication for the
sexual health in young people.