Closing Domestic Nutrient Cycles Using Microalgae.
Environ Sci Technol
; 49(20): 12450-6, 2015 Oct 20.
Article
em En
| MEDLINE
| ID: mdl-26389714
ABSTRACT
This study demonstrates that microalgae can effectively recover all P and N from anaerobically treated black water (toilet wastewater). Thus, enabling the removal of nutrients from the black water and the generation of a valuable algae product in one step. Screening experiments with green microalgae and cyanobacteria showed that all tested green microalgae species successfully grew on anaerobically treated black water. In a subsequent controlled experiment in flat-panel photobioreactors, Chlorella sorokiniana was able to remove 100% of the phosphorus and nitrogen from the medium. Phosphorus was depleted within 4 days while nitrogen took 12 days to reach depletion. The phosphorus and nitrogen removal rates during the initial linear growth phase were 17 and 122 mg·L(-1)·d(-1), respectively. After this initial phase, the phosphorus was depleted. The nitrogen removal rate continued to decrease in the second phase, resulting in an overall removal rate of 80 mg·L(-1)·d(-1). The biomass concentration at the end of the experiment was 11.5 g·L(-1), with a P content of approximately 1% and a N content of 7.6%. This high algal biomass concentration, together with a relatively short P recovery time, is a promising finding for future post-treatment of black water while gaining valuable algal biomass for further application.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Fósforo
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Chlorella
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Eliminação de Resíduos Líquidos
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Microalgas
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Nitrogênio
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article