between 80 and 95% depending on the influent concentration. Thus, the removal
efficiency was consistently high compared with the effectiveness found for other
MBR treatment. Diclofenac, as opposed to the previous substances, was resistant to
MBR treatment, demonstrating that DCF was only partially removed by the MBR
(21%).
IBU, NPX, and KTP are hydrophilic compounds, so their removal by adsorption
to biomass can be considered negligible [11, 40]. Several studies have attributed the
high removal effectiveness in MBR of these compounds to biodegradation. The high
biodegradability of these compounds causes the greater or lesser effectiveness in
elimination to depend on the operational variables of the biological treatment, one of
the most influential being sludge retention time.
7 Hollow Fiber Membrane
The hollow fiber membrane liquid-phase microextraction could be a good alternative
to extract nonsteroidal anti-inflammatory drugs from aqueous samples. It has been
reported that a supported liquid membrane in the pores in the wall of a small porous
hollow fiber can be used on bioanalytical and environmental chemistry, where
analytes are extracted through the supported liquid membrane by the application
of electrical potentials [41].
Liquid-phase membrane extraction is based on passive diffusion, and the flux of
analyte across the support liquid membrane is basically controlled by distribution
ratios. Recently, LPME was reported with a direct-current electrical potential difference across the SLM as the driving force for extraction based on electrokinetic
migration [42]. This technique was termed electromembrane extraction. For the
extraction of basic drugs, pH in the sample (300 L) and in the acceptor solution
(30 L) was adjusted to 2.0 with HCl to ensure full ionization of the target analytes.
Larsson et al. [33] developed a continuous flow system for the elimination of
NSAIDs by liquid-phase microextraction (SPME). In a Teflon tube, polypropylene
membranes placed 30 mm wall thickness, 240 mm id, and 0.1 mm by size. The tube
was fed by a flow of stock solution of each sample (ibuprofen, ketoprofen, naproxen,
and diclofenac) to 10 mgL
À1 and mixes of the four analytes diluted in water.
Ionizable analytes in neutral form were extracted through the membrane, and the
extraction was selectively tuned, depending mainly on pH in sample and extract.
272
R. M. Gómez-Espinosa and D. Arizmendi-Cotero
efficiency was consistently high compared with the effectiveness found for other
MBR treatment. Diclofenac, as opposed to the previous substances, was resistant to
MBR treatment, demonstrating that DCF was only partially removed by the MBR
(21%).
IBU, NPX, and KTP are hydrophilic compounds, so their removal by adsorption
to biomass can be considered negligible [11, 40]. Several studies have attributed the
high removal effectiveness in MBR of these compounds to biodegradation. The high
biodegradability of these compounds causes the greater or lesser effectiveness in
elimination to depend on the operational variables of the biological treatment, one of
the most influential being sludge retention time.
7 Hollow Fiber Membrane
The hollow fiber membrane liquid-phase microextraction could be a good alternative
to extract nonsteroidal anti-inflammatory drugs from aqueous samples. It has been
reported that a supported liquid membrane in the pores in the wall of a small porous
hollow fiber can be used on bioanalytical and environmental chemistry, where
analytes are extracted through the supported liquid membrane by the application
of electrical potentials [41].
Liquid-phase membrane extraction is based on passive diffusion, and the flux of
analyte across the support liquid membrane is basically controlled by distribution
ratios. Recently, LPME was reported with a direct-current electrical potential difference across the SLM as the driving force for extraction based on electrokinetic
migration [42]. This technique was termed electromembrane extraction. For the
extraction of basic drugs, pH in the sample (300 L) and in the acceptor solution
(30 L) was adjusted to 2.0 with HCl to ensure full ionization of the target analytes.
Larsson et al. [33] developed a continuous flow system for the elimination of
NSAIDs by liquid-phase microextraction (SPME). In a Teflon tube, polypropylene
membranes placed 30 mm wall thickness, 240 mm id, and 0.1 mm by size. The tube
was fed by a flow of stock solution of each sample (ibuprofen, ketoprofen, naproxen,
and diclofenac) to 10 mgL
À1 and mixes of the four analytes diluted in water.
Ionizable analytes in neutral form were extracted through the membrane, and the
extraction was selectively tuned, depending mainly on pH in sample and extract.
272
R. M. Gómez-Espinosa and D. Arizmendi-Cotero