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Author Palmeiro-Sanchez, T.; Fra-Vazquez, A.; Rey-Martinez, N.; Campos, J.L.; Mosquera-Corral, A.
Title Transient concentrations of NaCl affect the PHA accumulation in mixed microbial culture Type
Year 2016 Publication Journal Of Hazardous Materials Abbreviated Journal J. Hazard. Mater.
Volume (down) 306 Issue Pages 332-339
Keywords Inhibition; Microbial mixed culture; Polyhydroxyalkanoates; Sodium chloride; Volatile fatty acids
Abstract The present study explores the feasibility of the accumulation of polyhydroxyalkanoates (PHAs) under the presence of transient concentrations of added sodium chloride, by means of a mixed microbial culture (MMC). This culture was enriched on a mixture of volatile fatty acids (VFAs) containing 0.8 g Na+/L, as NaOH. This MMC presented a maximum PHA accumulation capacity of 53 wt% with 27 Cmol% HV. Accumulation experiments performed with added NaCI at concentrations of 7, 13 and 20 g/L shown that this salt provoked a decrease of the biomass PHA production rate, with an IC50 value close to 7 g NaCl/L. The accumulated PHA was lower than the corresponding value of the assay without the addition of salt. Furthermore, the composition of the biopolymer, in terms of HB:HV ratio, changed from 2.71 to 6.37 Cmol/Cmol, which means a HV decrease between 27 and 14 Cmol%. Summarizing, the PHA accumulation by a MMC non-adapted to saline conditions affected the polymer composition and lead to lower production yields and rates than in absence of added NaCl. (C) 2015 Elsevier B.V. All rights reserved.
Address [Palmeiro-Sanchez, T.; Fra-Vazquez, A.; Rey-Martinez, N.; Mosquera-Corral, A.] Univ Santiago de Compostela, Inst Technol, Dept Chem Engn, Rua Lope Gomez de Marzoa S-N, E-15705 Santiago De Compostela, Spain, Email: tania.palmeiro@usc.es
Corporate Author Thesis
Publisher Elsevier Science Bv Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0304-3894 ISBN Medium
Area Expedition Conference
Notes WOS:000374803400036 Approved
Call Number UAI @ eduardo.moreno @ Serial 616
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Author Palmeiro-Sanchez, T.; Campos, J.L.; Mosquera-Corral, A.
Title Bioconversion of Organic Pollutants in Fish-Canning Wastewater into Volatile Fatty Acids and Polyhydroxyalkanoate Type
Year 2021 Publication International Journal of Environmental Research and Public Health Abbreviated Journal Int. J. Environ. Res. Public Health
Volume (down) 18 Issue 19 Pages 10176
Keywords acidogenic fermentation; fish-canning wastewater; mixed culture; polyhydroxyalkanoates (PHAs); saline conditions; volatile fatty acids (VFAs)
Abstract The wastewater from the cookers of a tuna-canning plant was used as feedstock for the process. It was acidified in a continuous stirred tank reactor (CSTR) of 1.5 L to produce a mixture of volatile fatty acids (VFAs). The effluent contained 28.3 & PLUSMN; 8.7 g CODS/L and 25.0 & PLUSMN; 4.6 g CODVFA/L, 4.4 & PLUSMN; 1.6 g NH4+/L, and 10.9 & PLUSMN; 4.0 g Na+/L, which corresponds to about 28 g NaCl/L approximately. This was used to feed a PHA production system. The enriched MMC presented a capacity to accumulate PHAs from the fermented tuna wastewater. The maximum PHA content of the biomass in the fed-batch (8.35 wt% PHA) seemed very low, possibly due to the variable salinity (from 2.2 up to 12.3 g NaCl/L) and the presence of ammonium (which promoted the biomass growth). The batch assay showed a PHA accumulation of 5.70 wt% PHA, but this is a much better result if the productivity of the reactor is taken into account. The fed-batch reactor had a productivity of 10.3 mg PHA/(L h), while the batch value was about five times higher (55.4 mg PHA/(L h)). At the sight of the results, it can be seen that the acidification of fish-canning wastewater is possible even at high saline concentrations (27.7 g NaCl/L). On the other hand, the enrichment and accumulation results show us promising news and which direction has to be followed: PHAs can be obtained from challenging substrates, and the feeding mode during the accumulation stage has an important role to play when it comes to inhibition.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1660-4601 ISBN Medium
Area Expedition Conference
Notes WOS:000709111100001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1479
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