Simultaneous nutrient removal and biomass/lipid production by Chlorella sp. in seafood processing wastewater.
Sci Total Environ
; 640-641: 943-953, 2018 Nov 01.
Article
in En
| MEDLINE
| ID: mdl-30021327
ABSTRACT
Microalgae cultivation in wastewater has received increasing attention in recent years due to its many advantages. In this work, microalgae were cultured in seafood processing wastewater (SPW) for algal biomass and lipid production as well as nutrient removal. The biomass yield of Chlorella sp. achieved in the batch cultivation was 896â¯mgâ¯L-1, indicating that SPW contains a certain amount of nutrients which can be used for the growth of microalgae. However, the maximum specific growth rate of Chlorella sp. cultured in SPW throughout the whole cultivation period was only 0.040â¯d-1, suggesting that the growth of algal cells was inhibited during the culture process. High concentration of unionized ammonia in the SPW was found to be a factor inhibiting the growth of Chlorella sp. Aerated SPW (ASPW) and diluted SPW (DSPW) proved to be better culture media than SPW without pretreatment. The maximum specific growth rates of Chlorella sp. cultured in ASPW and DSPW during the culture interval were 0.156 and 0.091â¯d-1, respectively. Aeration pretreatment of SPW reduced the amount of toxic unionized ammonia, while most of the nutrients were retained in the wastewater. Therefore, higher biomass productivity (77.7â¯mgâ¯L-1â¯d-1) and higher lipid productivity (20.4â¯mgâ¯L-1â¯d-1) of microalgae were achieved in ASPW. Additionally, improved nutrient removal rates from ASPW were also achieved due to the faster growth of microalgae. The average nutrient removal rates in ASPW during the whole cultivation period were 4.98 and 1.91â¯mgâ¯L-1â¯d-1 for nitrogen and phosphorus, respectively.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Chlorella
/
Waste Disposal, Fluid
/
Seafood
Language:
En
Journal:
Sci Total Environ
Year:
2018
Document type:
Article