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Acta Limnologica Brasiliensia

versão impressa ISSN 0102-6712versão On-line ISSN 2179-975X

Resumo

ARAUJO, Fabiana; SANTOS, Hélio Rodrigues dos; BECKER, Vanessa  e  ATTAYDE, José Luiz. The use of polyaluminium chloride as a restoration measure to improve water quality in tropical shallow lakes. Acta Limnol. Bras. [online]. 2018, vol.30, e109.  Epub 06-Set-2018. ISSN 0102-6712.  http://dx.doi.org/10.1590/s2179-975x8416.

Aim

The aim of this study was to evaluate the performance of the coagulant Polyaluminium chloride (PAC) in water quality improvement of six eutrophic shallow lakes in Brazilian semiarid region.

Methods

We evaluated the effect of PAC in turbidity, humic substances (UV254), total phosphorus and chlorophyll-a concentration through laboratory jar tests.

Results

The results showed that PAC had a good performance in reducing total phosphorus concentrations and turbidity, with a reduced efficiency in removing chlorophyll-a and humic substances by sedimentation of flocks formed.

Conclusions

Addition of PAC is a potential tool for water quality improvement of eutrophic shallow lakes in Brazilian semiarid region but its efficiency depends on the pH and particulate and dissolved organic matter concentration in the lake or reservoir water.

Palavras-chave : coagulation; phosphorus removal; turbidity removal; lake restoration; semiarid region.

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