Abstract:To meet the strict requirements of reducing sulfur emission, more and more commercial ships have installed exhaust gas cleaning systems (EGCSs). However, wash water produced during cleaning process is discharged back to the marine environment. We investigated effects of the closed-loop scrubber (natrium-alkali method) wash water on three trophic species. Severe toxic effects were found when Dunaliella salina, Mysidopsis bahia and Mugilogobius chulae were exposed to 0.63-6.25, 0.63-10 and 1.25-20% concentration… Show more
“…Though studies on the harmful effects and analysis of PAHs in scrubber effluent have been recently introduced, a suitable process to degrade them remains undeveloped yet (Thor et al, 2021;Chen et al, 2022;Ji et al, 2022). Therefore, LPP was employed to degrade PAHs in real scrubber effluent and the performance was assessed.…”
Section: Application For Real Scrubber Effluentmentioning
confidence: 99%
“…In the field of marine environment, the number of studies on the hazards of PAHs from exhaust gas cleaning system (EGCS or scrubber) effluents has recently increased (Chen et al, 2022;Ji et al, 2022;Ytreberg et al, 2022). As the International Maritime Organization (IMO) has tightened the limits of sulfur emission (MARPOL, 2008), the number of vessels with scrubbers has sharply increased from 12 in 2011 to 4047 in 2020 (ICCT website).…”
Although the number of vessels with exhaust gas cleaning systems (EGCSs or scrubbers) has sharply increased to comply with strengthened regulations for marine environment, secondary pollutions are caused by discharged polycyclic aromatic hydrocarbons (PAHs) from scrubber effluent. Here, liquid-phase plasma (LPP) is employed to remediate water contaminated with PAHs. The increased frequency and pulse width enhanced the degradation efficiency, and 93.3, 90.7, 86.0, and 85.4% for naphthalene (Nap), acenaphthene (Ace), fluorene (Flu), and phenanthrene (Phe), respectively, are degraded at a frequency of 30 kHz and pulse width of 3 μs in 10 min. Considering physical condition of the plasma, long pulse width accelerated electrons, leading to increased generation of active species from intensified collision between electrons and surrounding molecules. Conversely, high frequency decelerated electrons due to the excessive changes in the polarity. However, the increased number of plasma discharges results in the generation of numerous active species. Generations of •OH and O radicals are confirmed by optical emission spectrometry and electron paramagnetic resonance. In addition, changes in functional groups which are corresponding to hydroxyl and oxygen groups are identified by Fourier transform infrared spectroscopy. Total PAHs in real scrubber are reduced from 1.1 to 0.4 μgL-1 with degradation efficiency of 63.6% after 10 min of LPP treatment. This study suggests LPP can be a promising method to protect diverse aqueous environments and provides optimal electrical discharge condition for degradation of organic pollutants.
“…Though studies on the harmful effects and analysis of PAHs in scrubber effluent have been recently introduced, a suitable process to degrade them remains undeveloped yet (Thor et al, 2021;Chen et al, 2022;Ji et al, 2022). Therefore, LPP was employed to degrade PAHs in real scrubber effluent and the performance was assessed.…”
Section: Application For Real Scrubber Effluentmentioning
confidence: 99%
“…In the field of marine environment, the number of studies on the hazards of PAHs from exhaust gas cleaning system (EGCS or scrubber) effluents has recently increased (Chen et al, 2022;Ji et al, 2022;Ytreberg et al, 2022). As the International Maritime Organization (IMO) has tightened the limits of sulfur emission (MARPOL, 2008), the number of vessels with scrubbers has sharply increased from 12 in 2011 to 4047 in 2020 (ICCT website).…”
Although the number of vessels with exhaust gas cleaning systems (EGCSs or scrubbers) has sharply increased to comply with strengthened regulations for marine environment, secondary pollutions are caused by discharged polycyclic aromatic hydrocarbons (PAHs) from scrubber effluent. Here, liquid-phase plasma (LPP) is employed to remediate water contaminated with PAHs. The increased frequency and pulse width enhanced the degradation efficiency, and 93.3, 90.7, 86.0, and 85.4% for naphthalene (Nap), acenaphthene (Ace), fluorene (Flu), and phenanthrene (Phe), respectively, are degraded at a frequency of 30 kHz and pulse width of 3 μs in 10 min. Considering physical condition of the plasma, long pulse width accelerated electrons, leading to increased generation of active species from intensified collision between electrons and surrounding molecules. Conversely, high frequency decelerated electrons due to the excessive changes in the polarity. However, the increased number of plasma discharges results in the generation of numerous active species. Generations of •OH and O radicals are confirmed by optical emission spectrometry and electron paramagnetic resonance. In addition, changes in functional groups which are corresponding to hydroxyl and oxygen groups are identified by Fourier transform infrared spectroscopy. Total PAHs in real scrubber are reduced from 1.1 to 0.4 μgL-1 with degradation efficiency of 63.6% after 10 min of LPP treatment. This study suggests LPP can be a promising method to protect diverse aqueous environments and provides optimal electrical discharge condition for degradation of organic pollutants.
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