Pubblicazione scientifica

Coagulant plus ballast technique provides a rapid mitigation of cyanobacterial nuisance

FILONE TECNOLOGICO	TEMA
produzione e raccolta

RIASSUNTO

Cyanobacteria blooms are a risk to environmental health and public safety due to the potent toxins certain cyanobacteria can produce. These nuisance organisms can be removed from water bodies by biomass flocculation and sedimentation. Here, we studied the efficacy of combinations of a low dose coagulant (poly-aluminium chloride—PAC—or chitosan) with different ballast compounds (red soil, bauxite, gravel, aluminium modified zeolite and lanthanum modified bentonite) to remove cyanobacterial biomass from water collected in Funil Reservoir (Brazil). We tested the effect of different cyanobacterial biomass concentrations on removal efficiency. We also examined if zeta potential was altered by treatments. Addition of low doses of PAC and chitosan (1–8 mg Al L-1) to the cyanobacterial suspensions caused flock formation, but did not settle the cyanobacteria. When those low dose coagulants were combined with ballast, effective settling in a dose-dependent way up to 99.7% removal of the flocks could be achieved without any effect on the zeta potential and thus without potential membrane damage. Removal efficacy was influenced by the cyanobacterial biomass and at higher biomass more ballast was needed to achieve good removal. The combined coagulant-ballast technique provides a promising alternative to algaecides in lakes, ponds and reservoirs.

DATA

Data di pubblicazione: 09/06/2017

AUTORI

NOYMA NATALIA P
DE MAGALHAES LEONARDO
MIRANDA MARCELA
MUCCI MAIRA
VAN OOSTERHOUT FRANK
HUSZAR VERA L M
MARINHO MARCELO M
LIMA EDUARDO R A
LURLING MIQUEL

ENTE DI AFFERENZA

LAB OF ECOLOGY & PHYSIOLOGY OF PHYTOPLANKTON DEPT PLANT BIOLOGY UNIV RIO DE JANEIRO STATE RIO DE JANEIRO BRAZIL
AQUATIC ECOLOGY & WATER QUALITY MGMT GROUP DEPT ENVIRONMENTAL SCIENCES WAGENINGEN UNIV WAGENINGEN NETHERLANDS
MUSEU NATL FEDERAL UNIV RIO DE JANEIRO RIO DE JANEIRO BRAZIL
CHEMISTRY INST UNIV RIO DE JANEIRO STATE RIO DE JANEIRO RIO DE JANEIRO BRASIL
DEPT AQUATIC ECOLOGY NETHERLANDS INST ECOLOGY NIOO KNAW WAGENINGEN NETHERLANDS
NATURAL ENVIRONMENT RSCH COUNCIL UK

RIVISTA

PLoS ONE, 12(6), e0178976

IMPACT FACTOR

2,870

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