Low flow water quality in rivers; septic tank systems and high-resolution phosphorus signals

Katrina Macintosh, Philip Jordan, R. Cassidy, Joerg Arnscheidt, C. Ward

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Rural point sources of phosphorus (P), including septic tank systems, provide a small part of the overall phosphorus budget to surface waters in agricultural catchments but can have a disproportionate impact on the low flow P concentration of receiving rivers. This has particular importance as the discharges are approximately constant into receiving waters and these have restricted dilution capacity during ecologically sensitive summer periods. In this study, a number of identified high impact septic systems were replaced with modem sequential batch reactors in three rural catchments during a monitoring period of 4 years. Sub-hourly P monitoring was conducted using bankside-analysers. Results show that strategic replacement of defective septic tank systems with modern systems and polishing filters decreased the low flow P concentration of one catchment stream by 0.032 mg TP L(-1) (0.018 mg TRP L(-1)) over the 4 years. However two of the catchment mitigation efforts were offset by continued new-builds that increased the density of septic systems from 3.4 km(-2) to 4.6 km(-2) and 13.8 km(-2) to 172 km(-2) and subsequently increased low flow P concentrations. Future considerations for septic system mitigation should include catchment carrying capacity as well as technology changes. (C) 2011 Elsevier B.V. All rights reserved.
LanguageEnglish
Pages58-65
JournalScience of the Total Environment
Volume412
DOIs
Publication statusPublished - Dec 2011

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low flow
catchment
phosphorus
water quality
river
mitigation
agricultural catchment
monitoring
carrying capacity
point source
dilution
replacement
filter
surface water
septic tank
summer
water

Cite this

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title = "Low flow water quality in rivers; septic tank systems and high-resolution phosphorus signals",
abstract = "Rural point sources of phosphorus (P), including septic tank systems, provide a small part of the overall phosphorus budget to surface waters in agricultural catchments but can have a disproportionate impact on the low flow P concentration of receiving rivers. This has particular importance as the discharges are approximately constant into receiving waters and these have restricted dilution capacity during ecologically sensitive summer periods. In this study, a number of identified high impact septic systems were replaced with modem sequential batch reactors in three rural catchments during a monitoring period of 4 years. Sub-hourly P monitoring was conducted using bankside-analysers. Results show that strategic replacement of defective septic tank systems with modern systems and polishing filters decreased the low flow P concentration of one catchment stream by 0.032 mg TP L(-1) (0.018 mg TRP L(-1)) over the 4 years. However two of the catchment mitigation efforts were offset by continued new-builds that increased the density of septic systems from 3.4 km(-2) to 4.6 km(-2) and 13.8 km(-2) to 172 km(-2) and subsequently increased low flow P concentrations. Future considerations for septic system mitigation should include catchment carrying capacity as well as technology changes. (C) 2011 Elsevier B.V. All rights reserved.",
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Low flow water quality in rivers; septic tank systems and high-resolution phosphorus signals. / Macintosh, Katrina; Jordan, Philip; Cassidy, R.; Arnscheidt, Joerg; Ward, C.

In: Science of the Total Environment, Vol. 412, 12.2011, p. 58-65.

Research output: Contribution to journalArticle

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T1 - Low flow water quality in rivers; septic tank systems and high-resolution phosphorus signals

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AU - Cassidy, R.

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AB - Rural point sources of phosphorus (P), including septic tank systems, provide a small part of the overall phosphorus budget to surface waters in agricultural catchments but can have a disproportionate impact on the low flow P concentration of receiving rivers. This has particular importance as the discharges are approximately constant into receiving waters and these have restricted dilution capacity during ecologically sensitive summer periods. In this study, a number of identified high impact septic systems were replaced with modem sequential batch reactors in three rural catchments during a monitoring period of 4 years. Sub-hourly P monitoring was conducted using bankside-analysers. Results show that strategic replacement of defective septic tank systems with modern systems and polishing filters decreased the low flow P concentration of one catchment stream by 0.032 mg TP L(-1) (0.018 mg TRP L(-1)) over the 4 years. However two of the catchment mitigation efforts were offset by continued new-builds that increased the density of septic systems from 3.4 km(-2) to 4.6 km(-2) and 13.8 km(-2) to 172 km(-2) and subsequently increased low flow P concentrations. Future considerations for septic system mitigation should include catchment carrying capacity as well as technology changes. (C) 2011 Elsevier B.V. All rights reserved.

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