Study of the effects of process parameters on electroforced sedimentation in solid–liquid separation using response surface methodology
Electroforced sedimentation (EFS) is a wellknown technique for enhancing the solid content of the final sludge cake. However, the parameters affecting the performance of EFS and quality of the resulting sludge cake, as well as the removed water, are not sufficiently studied. In this research, a...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Netherlands
2016
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/47254/ http://irep.iium.edu.my/47254/ http://irep.iium.edu.my/47254/ http://irep.iium.edu.my/47254/2/10.1007_s12649-015-9469-x.pdf http://irep.iium.edu.my/47254/10/47254-Study%20of%20the%20Effects%20of%20Process%20Parameters%20on%20Electroforced%20Sedimentation%20in_SCOPUS.pdf http://irep.iium.edu.my/47254/11/47254-Study%20of%20the%20Effects%20of%20Process%20Parameters%20on%20Electroforced%20Sedimentation%20in_WOS.pdf |
| Summary: | Electroforced sedimentation (EFS) is a wellknown
technique for enhancing the solid content of the
final sludge cake. However, the parameters affecting the
performance of EFS and quality of the resulting sludge
cake, as well as the removed water, are not sufficiently
studied. In this research, a mixture of zinc oxide (representing
sludge) and polyacrylamide (dewatering aid) were
used as experimental materials. The process parameters of
electroforced sedimentation were optimized using a design
of experiment software (Design Expert Version 7.0.0)
with a face-centered central composite design (FCCCD)
under response surface methodology. An optimization
study was carried out for the output response (sedimentation
velocity) based on three process factors and an
empirical model was developed. The optimized values for
current density, total solid volume per unit cross-sectional
area and polyacrylamide dose for the highest sedimentation
velocity (0.0199 cm/min) were 6.0 A/m2
, 7.74 mm and
1.53 % (based on the weight of zinc oxide), respectively.
The overall model was significant with Prob [F value of
0.0117 and R2 value of 0.8911 while the most significant
parameter was observed to be the current density with a
Prob [F value of 0.0004. Validation experiments were
conducted to confirm and measure the accuracy of the
models for the three set of parameters including optimum
parameters. The error was within the limit of prediction
accuracy, and the sedimentation velocity was enhanced by
the addition of 1.53 % PAM as dewatering aid. Thus, it
was concluded that EFS can be applied successfully for
materials having permanent charge. |
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