Proceedings of the Water Environment Federation, 2011
ABSTRACT This study investigated the changes of conventional parameters and selected microcontami... more 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.
In this work, the removal of arsenic (III) from contaminated water by means of electrospun nanofi... more In this work, the removal of arsenic (III) from contaminated water by means of electrospun nanofiber adsorptive membranes (ENAMs) has been reported. Polyvinylidene fluoride (PVDF) was used for preparation of the ENAMs incorporating titanium dioxide (TiO2)-halloysite nanotubes (HNTs) nanoparticles as adsorbents. Removal of arsenic (III) by the prepared ENAMs was studied at adsorbent to polymer ratios of 0, 0.25, and 0.5 w/w. The addition of TiO2-HNTs to the polymer left visible changes on the structural morphology and fibers properties of the membrane. The membrane samples were characterized by pure water permeability, contact angle measurement, TEM, SEM, XPS, and XRD. Results indicated that by increasing the TiO2-HNT content, the adsorption capacity of the membrane improved. A maximum of 31.2 mg/g of arsenic adsorption was achieved using TiO2-HNTto PVDF ratio of 0.5 w/w. The ENAMs were able to reduce the arsenic (III) concentration to less than 10 ppb, the level recommended by the W...
Several PPCPs/EDCs are being detected in surface drinking water sources, which is a great concern... more Several PPCPs/EDCs are being detected in surface drinking water sources, which is a great concern. The efficacy of ozonation in oxidizing 13 PPCPs/EDCs frequently detected in the Detroit River watershed was examined at pilot scale in the current study. Pilot-scale experiments ...
Proceedings of the Water Environment Federation, 2011
ABSTRACT This study investigated the changes of conventional parameters and selected microcontami... more 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.
In this work, the removal of arsenic (III) from contaminated water by means of electrospun nanofi... more In this work, the removal of arsenic (III) from contaminated water by means of electrospun nanofiber adsorptive membranes (ENAMs) has been reported. Polyvinylidene fluoride (PVDF) was used for preparation of the ENAMs incorporating titanium dioxide (TiO2)-halloysite nanotubes (HNTs) nanoparticles as adsorbents. Removal of arsenic (III) by the prepared ENAMs was studied at adsorbent to polymer ratios of 0, 0.25, and 0.5 w/w. The addition of TiO2-HNTs to the polymer left visible changes on the structural morphology and fibers properties of the membrane. The membrane samples were characterized by pure water permeability, contact angle measurement, TEM, SEM, XPS, and XRD. Results indicated that by increasing the TiO2-HNT content, the adsorption capacity of the membrane improved. A maximum of 31.2 mg/g of arsenic adsorption was achieved using TiO2-HNTto PVDF ratio of 0.5 w/w. The ENAMs were able to reduce the arsenic (III) concentration to less than 10 ppb, the level recommended by the W...
Several PPCPs/EDCs are being detected in surface drinking water sources, which is a great concern... more Several PPCPs/EDCs are being detected in surface drinking water sources, which is a great concern. The efficacy of ozonation in oxidizing 13 PPCPs/EDCs frequently detected in the Detroit River watershed was examined at pilot scale in the current study. Pilot-scale experiments ...
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