Average concentrations of toxic organic contaminants in sediments from 20 locations were
96.7 ng TEQ/kg dry matter for PCDD/Fs, 1.84 ng TEQ/kg dry matter for dioxin-like PCBs, 29.1 lg/kg dry
matter for PBDEs, 411 lg/kg dry matter for nonylphenols, 1021 lg/kg dry matter for fecal sterols, and
928 lg/kg dry matter for PAHs. Concentrations of all the organic contaminants and fecal sterols varied
widely and there was a clear decrease in concentration gradients with increasing distances from the
WWTP outfall. This result suggests that WWTP activities contribute to contamination by organic chemicals.
A survey of benthic organisms showed the dominance of a few polychaete species, indicating a deterioration
of the macrobenthic community by the WWTP discharge. Non-parametric multidimensional
scaling (MDS) ordination and Spearman correlation analyses showed that organic contamination is associated
with the benthic community structure. For polychaete species, the sensitive species for organic
contaminants was Paraprionospio pinnata, while contaminant-tolerant species were Spiochaetopterus
koreana and Capitella capitata. BIOENV analyses of all locations suggested PCDDs and PCDFs as the major
contaminants influencing the structure of the macrobenthic community. The present study highlights
that continuous WWTP discharges contribute to severe organic contamination and risks for the benthic
community in an aquatic ecosystem.
Average concentrations of toxic organic contaminants in sediments from 20 locations were96.7 ng TEQ/kg dry matter for PCDD/Fs, 1.84 ng TEQ/kg dry matter for dioxin-like PCBs, 29.1 lg/kg drymatter for PBDEs, 411 lg/kg dry matter for nonylphenols, 1021 lg/kg dry matter for fecal sterols, and928 lg/kg dry matter for PAHs. Concentrations of all the organic contaminants and fecal sterols variedwidely and there was a clear decrease in concentration gradients with increasing distances from theWWTP outfall. This result suggests that WWTP activities contribute to contamination by organic chemicals.A survey of benthic organisms showed the dominance of a few polychaete species, indicating a deteriorationof the macrobenthic community by the WWTP discharge. Non-parametric multidimensionalscaling (MDS) ordination and Spearman correlation analyses showed that organic contamination is associatedwith the benthic community structure. For polychaete species, the sensitive species for organiccontaminants was Paraprionospio pinnata, while contaminant-tolerant species were Spiochaetopteruskoreana and Capitella capitata. BIOENV analyses of all locations suggested PCDDs and PCDFs as the majorcontaminants influencing the structure of the macrobenthic community. The present study highlightsthat continuous WWTP discharges contribute to severe organic contamination and risks for the benthiccommunity in an aquatic ecosystem.
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