Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works

P.H. Cruddas, K. Wang, D. Best, B. Jefferson, E. Cartmell, A. Parker, E.J. McAdam

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An anaerobic pond (AP) for treatment of temperate domestic wastewater has been studied as a small works sludge management strategy to challenge existing practice which comprises solids separation followed by open sludge storage, for up to 90 days. During the study, effluent temperature ranged between 0.1°C and 21.1°C. Soluble COD production was noted in the AP at effluent temperatures typically greater than 10°C and was coincident with an increase in effluent volatile fatty acids (VFA) concentration, which is indicative of anaerobic degradation. Analysis from ports sited along the AP's length, demonstrated VFA to be primarily formed nearest the inlet where most solids deposition initially incurred, and confirmed the anaerobic reduction of sludge within this chamber. Importantly, the sludge accumulation rate was 0.06m3capita-1y-1 which is in the range of APs operated at higher temperatures and suggests a de-sludge interval of 2.3-3.8 years, up to 10 times longer than current practice for small works. Coincident with the solids deposition profile, biogas production was predominantly noted in the initial AP section, though biogas production increased further along the AP's length following start-up. A statistically significant increase in mean biogas production of greater than an order of magnitude was measured between winters (t(n=19)=5.52, P<0.001) demonstrating continued acclimation. The maximum methane yield recorded was 2630mgCH4PE-1d-1, approximately fifty times greater than estimated from sludge storage (57mgCH4PE-1d-1). Anaerobic ponds at small works can therefore enable sludge reduction and longer sludge holding times than present thus offsetting tanker demand whilst reducing fugitive methane emissions currently associated with sludge storage, and based on the enhanced yield noted, could provide a viable opportunity for local energy generation. © 2014 Elsevier B.V.
Original languageEnglish
Pages (from-to)64-71
Number of pages8
JournalEcological Engineering
Volume63
DOIs
Publication statusPublished - 2014

Fingerprint

Ponds
Biogas
Wastewater
pond
sludge
Volatile fatty acids
wastewater
Effluents
Methane
biogas
Temperature
effluent
fatty acid
methane
Degradation
accumulation rate
acclimation
temperature
degradation
winter

Cite this

Cruddas, P.H. ; Wang, K. ; Best, D. ; Jefferson, B. ; Cartmell, E. ; Parker, A. ; McAdam, E.J. / Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works. In: Ecological Engineering. 2014 ; Vol. 63. pp. 64-71.
@article{88684330133b4eaebc31f06b77d173e5,
title = "Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works",
abstract = "An anaerobic pond (AP) for treatment of temperate domestic wastewater has been studied as a small works sludge management strategy to challenge existing practice which comprises solids separation followed by open sludge storage, for up to 90 days. During the study, effluent temperature ranged between 0.1°C and 21.1°C. Soluble COD production was noted in the AP at effluent temperatures typically greater than 10°C and was coincident with an increase in effluent volatile fatty acids (VFA) concentration, which is indicative of anaerobic degradation. Analysis from ports sited along the AP's length, demonstrated VFA to be primarily formed nearest the inlet where most solids deposition initially incurred, and confirmed the anaerobic reduction of sludge within this chamber. Importantly, the sludge accumulation rate was 0.06m3capita-1y-1 which is in the range of APs operated at higher temperatures and suggests a de-sludge interval of 2.3-3.8 years, up to 10 times longer than current practice for small works. Coincident with the solids deposition profile, biogas production was predominantly noted in the initial AP section, though biogas production increased further along the AP's length following start-up. A statistically significant increase in mean biogas production of greater than an order of magnitude was measured between winters (t(n=19)=5.52, P<0.001) demonstrating continued acclimation. The maximum methane yield recorded was 2630mgCH4PE-1d-1, approximately fifty times greater than estimated from sludge storage (57mgCH4PE-1d-1). Anaerobic ponds at small works can therefore enable sludge reduction and longer sludge holding times than present thus offsetting tanker demand whilst reducing fugitive methane emissions currently associated with sludge storage, and based on the enhanced yield noted, could provide a viable opportunity for local energy generation. {\circledC} 2014 Elsevier B.V.",
author = "P.H. Cruddas and K. Wang and D. Best and B. Jefferson and E. Cartmell and A. Parker and E.J. McAdam",
note = "Export Date: 19 June 2018",
year = "2014",
doi = "10.1016/j.ecoleng.2013.12.011",
language = "English",
volume = "63",
pages = "64--71",
journal = "Ecological Engineering",
issn = "0925-8574",
publisher = "Elsevier",

}

Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works. / Cruddas, P.H.; Wang, K.; Best, D.; Jefferson, B.; Cartmell, E.; Parker, A.; McAdam, E.J.

In: Ecological Engineering, Vol. 63, 2014, p. 64-71.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works

AU - Cruddas, P.H.

AU - Wang, K.

AU - Best, D.

AU - Jefferson, B.

AU - Cartmell, E.

AU - Parker, A.

AU - McAdam, E.J.

N1 - Export Date: 19 June 2018

PY - 2014

Y1 - 2014

N2 - An anaerobic pond (AP) for treatment of temperate domestic wastewater has been studied as a small works sludge management strategy to challenge existing practice which comprises solids separation followed by open sludge storage, for up to 90 days. During the study, effluent temperature ranged between 0.1°C and 21.1°C. Soluble COD production was noted in the AP at effluent temperatures typically greater than 10°C and was coincident with an increase in effluent volatile fatty acids (VFA) concentration, which is indicative of anaerobic degradation. Analysis from ports sited along the AP's length, demonstrated VFA to be primarily formed nearest the inlet where most solids deposition initially incurred, and confirmed the anaerobic reduction of sludge within this chamber. Importantly, the sludge accumulation rate was 0.06m3capita-1y-1 which is in the range of APs operated at higher temperatures and suggests a de-sludge interval of 2.3-3.8 years, up to 10 times longer than current practice for small works. Coincident with the solids deposition profile, biogas production was predominantly noted in the initial AP section, though biogas production increased further along the AP's length following start-up. A statistically significant increase in mean biogas production of greater than an order of magnitude was measured between winters (t(n=19)=5.52, P<0.001) demonstrating continued acclimation. The maximum methane yield recorded was 2630mgCH4PE-1d-1, approximately fifty times greater than estimated from sludge storage (57mgCH4PE-1d-1). Anaerobic ponds at small works can therefore enable sludge reduction and longer sludge holding times than present thus offsetting tanker demand whilst reducing fugitive methane emissions currently associated with sludge storage, and based on the enhanced yield noted, could provide a viable opportunity for local energy generation. © 2014 Elsevier B.V.

AB - An anaerobic pond (AP) for treatment of temperate domestic wastewater has been studied as a small works sludge management strategy to challenge existing practice which comprises solids separation followed by open sludge storage, for up to 90 days. During the study, effluent temperature ranged between 0.1°C and 21.1°C. Soluble COD production was noted in the AP at effluent temperatures typically greater than 10°C and was coincident with an increase in effluent volatile fatty acids (VFA) concentration, which is indicative of anaerobic degradation. Analysis from ports sited along the AP's length, demonstrated VFA to be primarily formed nearest the inlet where most solids deposition initially incurred, and confirmed the anaerobic reduction of sludge within this chamber. Importantly, the sludge accumulation rate was 0.06m3capita-1y-1 which is in the range of APs operated at higher temperatures and suggests a de-sludge interval of 2.3-3.8 years, up to 10 times longer than current practice for small works. Coincident with the solids deposition profile, biogas production was predominantly noted in the initial AP section, though biogas production increased further along the AP's length following start-up. A statistically significant increase in mean biogas production of greater than an order of magnitude was measured between winters (t(n=19)=5.52, P<0.001) demonstrating continued acclimation. The maximum methane yield recorded was 2630mgCH4PE-1d-1, approximately fifty times greater than estimated from sludge storage (57mgCH4PE-1d-1). Anaerobic ponds at small works can therefore enable sludge reduction and longer sludge holding times than present thus offsetting tanker demand whilst reducing fugitive methane emissions currently associated with sludge storage, and based on the enhanced yield noted, could provide a viable opportunity for local energy generation. © 2014 Elsevier B.V.

U2 - 10.1016/j.ecoleng.2013.12.011

DO - 10.1016/j.ecoleng.2013.12.011

M3 - Article

VL - 63

SP - 64

EP - 71

JO - Ecological Engineering

JF - Ecological Engineering

SN - 0925-8574

ER -