![](bg4.png)
Figure 3: Adsorption of phosphorus with respect to the
contact time.
3.4 Treatment Capacity
The correlation of treatment capacity and
concentration is given in Table 1. It can be seen that
the estimated effluent treatment capacity ranged
1.63-11.36 and 1.63–10.12 mg/g for
Bentonite/La
2
(CO
3
)
3
and Bentonite+La
2
(CO
3
)
3
,
respectively, which clearly indicates their removal
potential for phosphorus treatment. Owing to the
repulsion between the negatively charged PO
4
3−
species and negatively charged surface sites of
bentonite, it is difficult for bentonite itself to adsorb
phosphorus in domestic sewage effluent. Apart from
the samples without bentonite, the best performing
indicated the importance of cooperation between
lanthanum carbonate and bentonite for phosphorus
removal.
Table 1: Phosphorus treatment capacity at different
adsorbents concentration.
4 CONCLUSIONS
The results of this study indicate that combination of
lanthanum carbonate and bentonite is very good
adsorbents for phosphorus disposal in domestic
sewage effluent. The results obtained for the
phosphorus removal were compared and the findings
showed that Bentonite/La
2
(CO
3
)
3
and
Bentonite+La
2
(CO
3
)
3
have good potential for
removing phosphorus from domestic sewage
effluent as compared to La
2
(CO
3
)
3
. In this work,
89.6% and 93.6% removal of phosphorus were
obtained by using Bentonite/La
2
(CO
3
)
3
and
Bentonite+La
2
(CO
3
)
3
at the dose of 320 mg/L for
48hr in the resting experiment.
ACKNOWLEDGEMENTS
This work was financially supported by National
Science and Technology Major Special Project,
China (2018ZX07208009).
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