A comprehensive comparison between halophilic granular and flocculent sludge in withstanding short and long-term salinity fluctuations

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Abstract

The effects of salinity fluctuations on the activity of autochthonous halophilic bacteria in aerobic granular sludge (AGS) and flocculent activated sludge (FAS) reactors were investigated. The response of nitrifiers and denitrifiers activity to drastic and moderate salinity shocks in the short-term (ST) and long-term (LT) was examined. The BOD5removal efficiency decreased only in the reactors subjected to the drastic LT salinity increase. Nevertheless, stable performances were achieved 18 days after the shock in the AGS-R1 (90%), whereas after 27 days in the FAS-R1 (82%). The loss in nitritation efficiency was higher in the FAS reactors and was proportional to the shock intensity. Nitritation activity collapsed from approximately 3.8 mgNH4-N gVSS−1h−1to 0.73 mgNH4-N gVSS−1h−1and from 4.5 mgNH4-N gVSS−1h−1to 0.24 mgNH4-N gVSS−1h−1in the AGS-R1 and FAS-R1, respectively, even if the ammonium oxidation capacity did not completely disappeared. Denitritation activity decreased from 11.44 mgNO2-N gVSS−1h−1to 3.93 mgNO2-N gVSS−1h−1in the AGS-R1 at steady state, whereas in the FAS-R1, it decreased from 12.53 mgNO2-N gVSS−1h−1to 2.09 mgNO2-N gVSS−1h−1. Nitritation and denitritation were completely restored 5 days after ST shock. No significant effects were observed after the moderate shock. The changes in the total EPS content were lower than 10%, therefore, it was considered negligible. Only drastic shocks caused significant changes in the EPS structure, with an increase of the loosely-bound by 45% in the AGS and 55% in the FAS.
LinguaEnglish
Pagine265-275
Number of pages11
RivistaJournal of Water Process Engineering
Volume22
Publication statusPublished - 2018

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Salinity
Sewage
activated sludge
sludge
salinity
Ammonium Compounds
Shock
Bacteria
Oxidation
comparison
ammonium
Aerobic Bacteria
oxidation
bacterium
reactor

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Process Chemistry and Technology
  • Waste Management and Disposal
  • Safety, Risk, Reliability and Quality

Cita questo

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title = "A comprehensive comparison between halophilic granular and flocculent sludge in withstanding short and long-term salinity fluctuations",
abstract = "The effects of salinity fluctuations on the activity of autochthonous halophilic bacteria in aerobic granular sludge (AGS) and flocculent activated sludge (FAS) reactors were investigated. The response of nitrifiers and denitrifiers activity to drastic and moderate salinity shocks in the short-term (ST) and long-term (LT) was examined. The BOD5removal efficiency decreased only in the reactors subjected to the drastic LT salinity increase. Nevertheless, stable performances were achieved 18 days after the shock in the AGS-R1 (90{\%}), whereas after 27 days in the FAS-R1 (82{\%}). The loss in nitritation efficiency was higher in the FAS reactors and was proportional to the shock intensity. Nitritation activity collapsed from approximately 3.8 mgNH4-N gVSS{\^a}ˆ’1h{\^a}ˆ’1to 0.73 mgNH4-N gVSS{\^a}ˆ’1h{\^a}ˆ’1and from 4.5 mgNH4-N gVSS{\^a}ˆ’1h{\^a}ˆ’1to 0.24 mgNH4-N gVSS{\^a}ˆ’1h{\^a}ˆ’1in the AGS-R1 and FAS-R1, respectively, even if the ammonium oxidation capacity did not completely disappeared. Denitritation activity decreased from 11.44 mgNO2-N gVSS{\^a}ˆ’1h{\^a}ˆ’1to 3.93 mgNO2-N gVSS{\^a}ˆ’1h{\^a}ˆ’1in the AGS-R1 at steady state, whereas in the FAS-R1, it decreased from 12.53 mgNO2-N gVSS{\^a}ˆ’1h{\^a}ˆ’1to 2.09 mgNO2-N gVSS{\^a}ˆ’1h{\^a}ˆ’1. Nitritation and denitritation were completely restored 5 days after ST shock. No significant effects were observed after the moderate shock. The changes in the total EPS content were lower than 10{\%}, therefore, it was considered negligible. Only drastic shocks caused significant changes in the EPS structure, with an increase of the loosely-bound by 45{\%} in the AGS and 55{\%} in the FAS.",
keywords = "Aerobic granular sludge; FAS; Fish-canning wastewater; Salinity shocks; Shortcut nitrification/denitrification; Biotechnology; Safety, Risk, Reliability and Quality; Waste Management and Disposal; Process Chemistry and Technology",
author = "Gaspare Viviani and Marco Capodici and Michele Torregrossa and Corsino, {Santo Fabio}",
year = "2018",
language = "English",
volume = "22",
pages = "265--275",
journal = "Journal of Water Process Engineering",
issn = "2214-7144",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - A comprehensive comparison between halophilic granular and flocculent sludge in withstanding short and long-term salinity fluctuations

AU - Viviani, Gaspare

AU - Capodici, Marco

AU - Torregrossa, Michele

AU - Corsino, Santo Fabio

PY - 2018

Y1 - 2018

N2 - The effects of salinity fluctuations on the activity of autochthonous halophilic bacteria in aerobic granular sludge (AGS) and flocculent activated sludge (FAS) reactors were investigated. The response of nitrifiers and denitrifiers activity to drastic and moderate salinity shocks in the short-term (ST) and long-term (LT) was examined. The BOD5removal efficiency decreased only in the reactors subjected to the drastic LT salinity increase. Nevertheless, stable performances were achieved 18 days after the shock in the AGS-R1 (90%), whereas after 27 days in the FAS-R1 (82%). The loss in nitritation efficiency was higher in the FAS reactors and was proportional to the shock intensity. Nitritation activity collapsed from approximately 3.8 mgNH4-N gVSS−1h−1to 0.73 mgNH4-N gVSS−1h−1and from 4.5 mgNH4-N gVSS−1h−1to 0.24 mgNH4-N gVSS−1h−1in the AGS-R1 and FAS-R1, respectively, even if the ammonium oxidation capacity did not completely disappeared. Denitritation activity decreased from 11.44 mgNO2-N gVSS−1h−1to 3.93 mgNO2-N gVSS−1h−1in the AGS-R1 at steady state, whereas in the FAS-R1, it decreased from 12.53 mgNO2-N gVSS−1h−1to 2.09 mgNO2-N gVSS−1h−1. Nitritation and denitritation were completely restored 5 days after ST shock. No significant effects were observed after the moderate shock. The changes in the total EPS content were lower than 10%, therefore, it was considered negligible. Only drastic shocks caused significant changes in the EPS structure, with an increase of the loosely-bound by 45% in the AGS and 55% in the FAS.

AB - The effects of salinity fluctuations on the activity of autochthonous halophilic bacteria in aerobic granular sludge (AGS) and flocculent activated sludge (FAS) reactors were investigated. The response of nitrifiers and denitrifiers activity to drastic and moderate salinity shocks in the short-term (ST) and long-term (LT) was examined. The BOD5removal efficiency decreased only in the reactors subjected to the drastic LT salinity increase. Nevertheless, stable performances were achieved 18 days after the shock in the AGS-R1 (90%), whereas after 27 days in the FAS-R1 (82%). The loss in nitritation efficiency was higher in the FAS reactors and was proportional to the shock intensity. Nitritation activity collapsed from approximately 3.8 mgNH4-N gVSS−1h−1to 0.73 mgNH4-N gVSS−1h−1and from 4.5 mgNH4-N gVSS−1h−1to 0.24 mgNH4-N gVSS−1h−1in the AGS-R1 and FAS-R1, respectively, even if the ammonium oxidation capacity did not completely disappeared. Denitritation activity decreased from 11.44 mgNO2-N gVSS−1h−1to 3.93 mgNO2-N gVSS−1h−1in the AGS-R1 at steady state, whereas in the FAS-R1, it decreased from 12.53 mgNO2-N gVSS−1h−1to 2.09 mgNO2-N gVSS−1h−1. Nitritation and denitritation were completely restored 5 days after ST shock. No significant effects were observed after the moderate shock. The changes in the total EPS content were lower than 10%, therefore, it was considered negligible. Only drastic shocks caused significant changes in the EPS structure, with an increase of the loosely-bound by 45% in the AGS and 55% in the FAS.

KW - Aerobic granular sludge; FAS; Fish-canning wastewater; Salinity shocks; Shortcut nitrification/denitrification; Biotechnology; Safety, Risk, Reliability and Quality; Waste Management and Disposal; Process Chemistry and Technology

UR - http://hdl.handle.net/10447/283405

UR - http://www.journals.elsevier.com/journal-of-water-process-engineering/

M3 - Article

VL - 22

SP - 265

EP - 275

JO - Journal of Water Process Engineering

T2 - Journal of Water Process Engineering

JF - Journal of Water Process Engineering

SN - 2214-7144

ER -