Isotopic distribution of carbon from sewage sludge and eutrophication in the sediments and food web of estuarine ecosystems

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Environmental Science and Technology; (United States)

DOI:https://doi.org/10.1021/es00014a012· OSTI ID:5164152

Gearing, P J; Gearing, J N; Maughan, J T; Oviatt, C A ^[1]

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1. Univ. of Rhode Island, Narragansett (USA)

Stable isotope ratios ({delta}{sup 13}C) from samples of water, sediments, and biota traced the behavior of organic carbon for 3 summer months in estuarine mesocosms (three controls, three with added sewage sludge, three with added inorganic nutrients). Isotope ratios proved to be a useful quantitative tracer for sewage carbon as well as for the fresh phytoplanktonic carbon produced during nutrient fertilization. Sewage sludge sedimented within hours of its addition, and approximately 50% remained in sediments after 99 days. The sludge was not inert, but was biologically oxidized at rates similar to those of phytoplankton carbon. Its residence time in the water column was too short for uptake by zooplankton, but it was readily assimilated by some benthic organisms. Fresh phytoplanktonic carbon from nutrient-induced blooms was isotopically heavy and thus distinguishable from old primary production (fixed before the experiment). It flowed through the pelagic and benthic food webs more extensively and more uniformly than did sludge carbon.

• OSTI ID: 5164152
• Journal Information: Environmental Science and Technology; (United States), Vol. 25:2; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ESTUARIES
EUTROPHICATION
SEWAGE SLUDGE
ENVIRONMENTAL EFFECTS
AQUATIC ECOSYSTEMS
CARBON 13
EXPERIMENTAL DATA
ISOTOPE RATIO
MEASURING METHODS
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
CARBON ISOTOPES
DATA
ECOSYSTEMS
EVEN-ODD NUCLEI
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATERIALS
NUCLEI
NUMERICAL DATA
SEWAGE
SLUDGES
STABLE ISOTOPES
SURFACE WATERS
WASTES
540311* - Environment
Aquatic- Basic Studies- Radiometric Techniques- (1990-)
540211 - Environment
Terrestrial- Basic Studies- Radiometric Techniques- (1990-)