The maximum P adsorption capacity as determined by the
Langmuir equation of the Al-WTR used in the study range from 10.2
to 31.9 mg P g1, compared to an adsorption capacity range of 0.09–
0.62 mg P g1 obtained for the four substrates in the study by Tang
et al. (2008). In our previous studies (Yang et al., 2006), we have
shown that the driving force of P removal by the Al-WTR is
considered to be the abundant aluminium ions in its matrix and
this is also in agreement with other authors (Ippolito et al., 2003;
Makris et al., 2005). The abundant aluminium ions in the Al-WTR
greatly influence its adsorption behaviour and capacity through the
ligand exchange mechanism. Furthermore, the Al-WTR has
a greater capacity for P adsorption than most of the other substrates
based on the evaluation of the maximum P adsorption capacity
using the Langmuir model (see Section 3.3.1). This would therefore
facilitate rapid P removal in the systems. The greater k values
obtained in the current study and the comparatively greater Al-
WTR adsorption capacity suggest its use in engineered wetlands
systems as a very promising and practical solution to remove
P from P-rich wastewaters.
The maximum P adsorption capacity as determined by the
Langmuir equation of the Al-WTR used in the study range from 10.2
to 31.9 mg P g1, compared to an adsorption capacity range of 0.09–
0.62 mg P g1 obtained for the four substrates in the study by Tang
et al. (2008). In our previous studies (Yang et al., 2006), we have
shown that the driving force of P removal by the Al-WTR is
considered to be the abundant aluminium ions in its matrix and
this is also in agreement with other authors (Ippolito et al., 2003;
Makris et al., 2005). The abundant aluminium ions in the Al-WTR
greatly influence its adsorption behaviour and capacity through the
ligand exchange mechanism. Furthermore, the Al-WTR has
a greater capacity for P adsorption than most of the other substrates
based on the evaluation of the maximum P adsorption capacity
using the Langmuir model (see Section 3.3.1). This would therefore
facilitate rapid P removal in the systems. The greater k values
obtained in the current study and the comparatively greater Al-
WTR adsorption capacity suggest its use in engineered wetlands
systems as a very promising and practical solution to remove
P from P-rich wastewaters.
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