Impact of Wastewater Treatment Process Configuration on Effluent Chemistry and Biological Responses
Abstract:This study investigated the changes of conventional parameters and selected microcontaminants (MCs) in effluents from three activated sludge (AS) systems including conventional AS (CAS), nitrifying AS (CAS-N) and biological nutrient removal (CAS-BNR) processes at pilot scale. The effluents were also characterized with a suite of biological assays and lifecycle investigations. The biological assays tests included rainbow trout acute lethality (96-h), Daphnia magna acute lethality (48-h), fathead minnow survival and growth (7-d), Ceriodaphnia dubia survival and reproduction (7-d), duckweed growth inhibition (7-d) and algal growth inhibition (72-h). Other tests included receptor binding tests (yeast estrogenic screening (YES), yeast androgenic screening (YAS) and thyroid transport receptor (T4/hTTR)) and whole organism tests (fathead minnow lifecycle exposure test, zebrafish reproduction test). For most chemistry endpoints and long-term fish health endpoints, the CAS-BNR process was the most effective in reducing contaminant concentration levels and toxic effects.
Document Type: Research Article
Publication date: January 1, 2011
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