Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: Effect of exposure time and concentration

S. Zahedi; P. Icaran; Z. Yuan; M. Pijuan

doi:10.1016/j.biortech.2016.06.038

Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: Effect of exposure time and concentration

S. Zahedi
, P. Icaran
, Z. Yuan
, M. Pijuan

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

69 Citations (Scopus)

Abstract

Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO₂/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO₂/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations. © 2016 Elsevier Ltd.

Original language	English
Pages (from-to)	870-875
Journal	Bioresource Technology
Volume	216
DOIs	https://doi.org/10.1016/j.biortech.2016.06.038
Publication status	Published - 1 Sept 2016
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This work was funded by CDTI (Centro para el Desarrollo Tecnológico Industrial, Spanish Government) through project Smart Green Gas (IDI-20141342). We would like to thank Mr. Jordi Palatsi from Lleida wastewater treatment plant for providing the mixed sludge and inoculum.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation

Research Keywords

Anaerobic digestion
Free-nitrous acid pre-treatment
Methane production
Mixed sludge
Sludge biodegradability

Access Output

10.1016/j.biortech.2016.06.038

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{9bc70e30bdb24a34bdc007001990c3c9,

title = "Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: Effect of exposure time and concentration",

abstract = "Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO2/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10\% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25\%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO2/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations. {\textcopyright} 2016 Elsevier Ltd.",

keywords = "Anaerobic digestion, Free-nitrous acid pre-treatment, Methane production, Mixed sludge, Sludge biodegradability",

author = "S. Zahedi and P. Icaran and Z. Yuan and M. Pijuan",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

year = "2016",

month = sep,

day = "1",

doi = "10.1016/j.biortech.2016.06.038",

language = "English",

volume = "216",

pages = "870--875",

journal = "Bioresource Technology",

issn = "0960-8524",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge

T2 - Effect of exposure time and concentration

AU - Zahedi, S.

AU - Icaran, P.

AU - Yuan, Z.

AU - Pijuan, M.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO2/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO2/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations. © 2016 Elsevier Ltd.

AB - Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO2/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO2/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations. © 2016 Elsevier Ltd.

KW - Anaerobic digestion

KW - Free-nitrous acid pre-treatment

KW - Methane production

KW - Mixed sludge

KW - Sludge biodegradability

UR - https://www.scopus.com/pages/publications/84974851987

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84974851987&origin=recordpage

U2 - 10.1016/j.biortech.2016.06.038

DO - 10.1016/j.biortech.2016.06.038

M3 - RGC 21 - Publication in refereed journal

C2 - 27318660

SN - 0960-8524

VL - 216

SP - 870

EP - 875

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: Effect of exposure time and concentration

Abstract

Bibliographical note

Funding

UN SDGs

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this