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SAKIN, AHMET EGEMEN

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SAKIN

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AHMET EGEMEN

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2020 - 20212
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    Publication
    Effects of hydrogen peroxide and temperature on removal of polycyclic aromatic hydrocarbons (Pahs) from soil during photodegradation applications
    (Taylor, 2021-01-07) Sengül, Burcu; Eker Sanlı, Gizem; Sakin, Ahmet Egemen; ŞENGÜL, BURCU; EKER ŞANLI, GİZEM; SAKIN, AHMET EGEMEN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü; 0000-0003-0877-402X; 0000-0002-0513-0520; AAZ-1166-2020; AAH-3216-2021; AAH-3216-2021
    This study investigated the removal of polycyclic aromatic hydrocarbons (PAHs) from soils around a cement factory in Bursa-Turkey. UVA and UVA-H2O2 applications were carried out with the particular apparatus. The evaporated PAHs were collected with the polyurethane foam (PUF) column in this apparatus. UVA applications were carried out simultaneously at two temperatures (18 degrees C and 35 degrees C) to determine the effect of temperature on PAHs' removal. Evaporated PAH amounts and PAH removal efficiencies were calculated. In UVA applications (without using H2O2), n-ary sumation (12) PAH removal efficiency was calculated as 90%, and this value increased to 95% with the use of H2O2. The highest PAH removal ratio (95%) was obtained with UVA-H2O2 (1% H2O2) application. An increase in temperature did not contribute significantly to the removal of PAHs (except for 20% H2O2). During the experiments, the amount of evaporated PAHs from soil to air increased depending on the temperature. It was observed that 80% of evaporated PAHs were formed 3 ring compounds (Phe, Ant) at 35 degrees C. It was concluded that only low H2O2 dose (1%) was effective on the removal of PAHs from soils at 18 degrees C and 35 degrees C.
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    Determination of fluxes and mass transfer coefficients of polychlorinated biphenyls (PCBs)
    (Türk Milli Komitesi Hava Kirliliği Araştırma ve Kontrol, 2020-08-01) Sakin, Ahmet Egemen; Taşdemir, Yücel; SAKIN, AHMET EGEMEN; TAŞDEMİR, YÜCEL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü; 0000-0002-0513-0520; 0000-0002-6192-8609; AAG-9468-2021; GDE-4908-2022
    This study evaluated a modified water surface sampler (MWSS) in terms of deposition characteristics of atmospheric polychlorinated biphenyls (PCBs). Water was employed as a collection surface for the atmospheric PCBs. The main difference between the MWSS and previous WSSs was its cover which prevented the deposition of particles and minimized wind effects. Therefore, lower particle-phase deposition fluxes were observed. Moreover, preventing wind from the water surface, which was the collection surface, caused lower dissolved phase fluxes and mass transfer coefficients (MTCs). Forty-eight flux and ambient air samples were taken by using an MWSS and a high volume air sampler (HVAS), respectively. The average dissolved phase PCB fluxes were 5.92 +/- 5.37 ng/m(2)-day. Particle phase PCB fluxes were also determined by attaching a filter to the sampler. The particle phase flux ratio was 14% of the total flux, which was much smaller than previously reported ones. This difference was mainly due to the cover layer which minimized the wind effects. 4- CBs and lower chlorinated PCBs were dominant in the samples. Homolog groups obtained from both the MWSS and HVAS were highly correlated. This result indicated that both samplers collected similar atmospheric PCBs. Then, MTCs were calculated for each PCB congener. To calculate the MTCs, dissolved phase PCB fluxes were divided by gas-phase PCB concentration. The average MTC was determined to be 0.25 +/- 0.23 cm/s which was smaller than the previously reported MTCs. This result illustrated that the MWSS configuration allowed us to determine the minimum MTCs and gas transfers to the water.