The perspective is that the Chitosan modified with some anionic polyelectrolytes will increase the capacity chelating or natural polymers that provide better
mechanical properties like, polyvinyl alcohol, mucilage, polyacrylamide, acrylic
acid, etc.
3.4 Conclusion
This study has shown the results of wastewater treatment in purification plants
within the UAQ, which is realized by several steps, biological treatment with
activated sludge, disinfection process with a photocatalytic material, and metal
removal with a natural polymer.
A growing volume from the activated sludge, which increases gradually as
demand grew in the UAQ for using water from the sanitary services to the laboratory demands, helps to consume organic matter faster; after the process is evident the significant reduction in total solids, pH, and total fecal coliform become
evident and necessary for a disinfection process to prevent disease spread.
The disinfection process was carried out with TiO 2 catalyst synthesized by the
sol–gel method, and doped with 0.1, 1, and 10 %w of Ag, which after XRD
analysis shows the presence of anatase phase and absence of rutile phase; with an
average crystal size of 29 nm for pristine TiO 2 and for doped material average
crystal size between 13 and 9 nm.
The material doped decreased the bandgap to 3.15 from 3.2, raw TiO 2 , which is
attributed to the presence of Ag and this significant change will lead us to propose
that the material can be activated with solar light. Thus, in this process for pristine
TiO2 there is a microorganism reduction of 50 % compared with the treated
Table 3.4 Deacetylation degree computed for the samples
Traditional method
Microwave method
NaOH
KOH
NaOH
KOH
73.57 ± 1.01
75.97 ± 0.70
62.93 ± 0.82
62.83 ± 0.37
Table 3.5 Chelate capacity from chitosan obtained for both ways
Sample
Concentration retained
(mgL
-1 )
Percentage
(%)
Blank
1.5857
31.94
Traditional with NaOH
0.9719
19.58
Traditional with KOH
0.9787
19.71
Microwave with NaOH
0.3589
7.23
Microwave with KOH
0.4136
8.33
94
L. Pérez-Sánchez et al.
mechanical properties like, polyvinyl alcohol, mucilage, polyacrylamide, acrylic
acid, etc.
3.4 Conclusion
This study has shown the results of wastewater treatment in purification plants
within the UAQ, which is realized by several steps, biological treatment with
activated sludge, disinfection process with a photocatalytic material, and metal
removal with a natural polymer.
A growing volume from the activated sludge, which increases gradually as
demand grew in the UAQ for using water from the sanitary services to the laboratory demands, helps to consume organic matter faster; after the process is evident the significant reduction in total solids, pH, and total fecal coliform become
evident and necessary for a disinfection process to prevent disease spread.
The disinfection process was carried out with TiO 2 catalyst synthesized by the
sol–gel method, and doped with 0.1, 1, and 10 %w of Ag, which after XRD
analysis shows the presence of anatase phase and absence of rutile phase; with an
average crystal size of 29 nm for pristine TiO 2 and for doped material average
crystal size between 13 and 9 nm.
The material doped decreased the bandgap to 3.15 from 3.2, raw TiO 2 , which is
attributed to the presence of Ag and this significant change will lead us to propose
that the material can be activated with solar light. Thus, in this process for pristine
TiO2 there is a microorganism reduction of 50 % compared with the treated
Table 3.4 Deacetylation degree computed for the samples
Traditional method
Microwave method
NaOH
KOH
NaOH
KOH
73.57 ± 1.01
75.97 ± 0.70
62.93 ± 0.82
62.83 ± 0.37
Table 3.5 Chelate capacity from chitosan obtained for both ways
Sample
Concentration retained
(mgL
-1 )
Percentage
(%)
Blank
1.5857
31.94
Traditional with NaOH
0.9719
19.58
Traditional with KOH
0.9787
19.71
Microwave with NaOH
0.3589
7.23
Microwave with KOH
0.4136
8.33
94
L. Pérez-Sánchez et al.