Browsing by Author "Yildiz E."

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Ammonia stripping using a continuous flow jet loop reactor: mass transfer of ammonia and effect on stripping performance of influent ammonia concentration, hydraulic retention time, temperature, and air flow rate
(2021-06-01) Değermenci N.; Yildiz E.
When wastewater containing ammonia is discharged into the receiving environment without any kind of treatment, it causes both environmental problems and negatively affects human health. In this study, the aim was to strip ammonia using air in a continuous flow jet loop reactor (JLR) and investigate the effects of ammonia concentration, hydraulic retention time (HRT), air flow rate, and temperature on ammonia removal within this scope. By changing the ammonia concentration in the influent, no significant change was observed in ammonia removal efficiency. With air flow rate 45 L min−1, temperature 50 °C, pH 11, and HRT 7.5 h, mean 88.1% ammonia removal was achieved. Increasing the HRT, air flow rate, and temperature increased the ammonia removal efficiency. Later the ammonia stripping process in the continuous flow JLR was modeled and the volumetric mass transfer coefficient (KLa) for each parameter was calculated from the model equation. While the experimental parameters of air flow rate and temperature had a significant effect on the mass transfer coefficient, influent ammonia concentration and HRT were determined to have no effect.
Comparison of phenol removal with ozonation in jet loop reactor and bubble column
(2020-10-01) Barlak M.S.; Degermenci N.; Cengiz I.; Ucun Özel H.; Yildiz E.
This study aimed to remove phenol with ozonation in a jet loop reactor (JLR) and a bubble column (BC). In the first stage of the study, the mass transfer properties of JLR were determined and superiority over BC reactors were shown, and in the second stage, these reactors were used in phenol removal studies. At the same conditions, the volumetric mass transfer coefficient of JLR was 0.540 min-1, while this value was determined as 0.246 min-1 in the BC reactor. In phenol removal, the effects of initial phenol concentration, ozone dosage and pH on phenol and chemical oxygen demand (COD) removal were determined for both JLR and BC. While the pseudo-first rate constant for phenol removal in JLR at 221 mg/min ozone dosage was 0.1756 min-1, this value was only calculated as 0.1157 min-1 in the BC reactor. As a result, it has been shown that JLRs can achieve higher ozone gas transfer with lower energy consumption and perform more effective phenol and COD removal than BC reactors, especially at low pH and high ozone dosages.
COVID-19 History Increases the Anxiety of Mothers with Children in Intensive Care during the Pandemic in Turkey
(2022-10-01) Yildiz E.; Koc Apaydin Z.; Alay B.; Dincer Z.; Cigri E.
This study aimed to examine the mental status of mothers whose children were hospitalized during the COVID-19 pandemic, especially in places where risk factors are higher such as pediatric intensive care units, and to contribute to the development of psychological health policies, especially for these high-risk groups in epidemic situations. Method: This descriptive cross-sectional study was conducted between January 2021 and July 2021. The population of the study was mothers whose children were hospitalized in the pediatric intensive care unit during the study period. Data collection was carried out via a face-to-face interview method by experienced nurses working in pediatric clinics using a sociodemographic data form, the Beck Anxiety Inventory, the Beck Depression Inventory, the Fear of COVID-19 Inventory, and the Coronavirus Anxiety Inventory. Results: The median age of the participants was 33 (min: 21, max: 50). The Beck Anxiety score was affected by the child’s diagnosis, location, and history of COVID-19 (* P = 0.011, ** P = 0.018, and *** P = 0.002, respectively). Similarly, the Beck Depression score was affected by the child’s diagnosis and history of COVID-19 in a relative (* P = 0.034 and ** P = 0.037, respectively). The Coronavirus Anxiety score was affected by a history of COVID-19 in a relative and work status (* P = 0.040 and ** P = 0.005, respectively), while the Fear of COVID-19 score was not significantly affected by any variable. In a logistic regression model, previous COVID-19 experience was independently associated with anxiety; a history of COVID-19 increased the risk of developing anxiety by approximately 15 times (odds ratio: 14.915, 95% CI: 2.075–107.192). Conclusion: When children of mothers with a history of COVID-19 are hospitalized, special attention should be given to their mothers concerning psychological support and assistance.
Drinking water treatment in submerged hollow fiber microfiltration: Effect of backwashing
(2016-01-01) Yildiz E.; Cengiz I.; Kop A.; Degermenci N.; Nuhoglu A.
Epidemiologic and clinical characteristics of neonates with late-onset COVID-19: 1-year data of Turkish Neonatal Society
(2022-05-01) Akin I.M.; Kanburoglu M.K.; Tayman C.; Oncel M.Y.; Imdadoglu T.; Dilek M.; Yaman A.; Narter F.; Er I.; Kahveci H.; Erdeve O.; Koc E.; Yildiz E.; Melekoglu N.A.; Okulu E.; Toptan H.H.; Surmeli O.; Can E.; Yilmaz F.H.; Ozkan H.; Caner I.; Cömert S.; Uygun S.S.; Akbay S.; Memisoglu A.; Anik A.; Arcagok B.C.; Karagol B.S.; Ates M.; Bulut M.; Akin M.A.; Demir N.; Ozdemir R.; Arayici S.; Kader S.; Zubarioglu A.U.; Oktem A.; Bulbul A.; Hekimoglu B.; Ataoglu E.; Baser D.O.; Yalinbas E.E.; Imamoglu E.Y.; Ozlu F.; Bilgin L.; Kefeli M.; Arslan M.K.; Akar S.; Bezirganoglu H.; Bozdag S.; Gurpinar R.; Ciftdemir N.A.; Ozdemir O.M.
The literature on neonates with SARS-CoV-2 is mainly concerned with perinatal cases, and scanty data are available about environmentally infected neonates. To fill knowledge gaps on the course and prognosis of neonatal cases, we analyzed 1-year data from the Turkish Neonatal Society in this prospective cohort study of neonates with postnatal transmission. Data from 44 neonatal intensive care units (NICUs), of neonates with positive RT-PCR results at days 5–28 of life, were extracted from the online registry system and analyzed. Of 176 cases, most were term infants with normal birth weight. Fever was the most common symptom (64.2%), followed by feeding intolerance (25.6%), and cough (21.6%). The median length of hospitalization was 9 days, with approximately one quarter of infants receiving some type of ventilatory support. Myocarditis (5.7%) was the most common complication during follow-up. Among the clinical findings, cough (odds ratio [OR]: 9.52, 95% confidence interval [CI]: 4.17–21.71), tachypnea (OR: 26.5, 95% CI: 9.59–73.19), and chest retractions (OR: 27.5, 95% CI: 5.96–126.96) were associated with more severe clinical disease. Also, there were significant differences in the C-reactive protein level, prothrombin time (PT), partial thromboplastin time, international normalized ratio, and days in the NICU (p = 0.002, p = 0.012, p = 0.034, p = 0.008, and p < 0.001, respectively) between patients with mild-moderate and severe-critical presentations. A PT above 14 s was a significant predictor of severe/critical cases, with a sensitivity of 64% and specificity of 73%. Conclusions: Our data showed that late-onset COVID-19 infection in neonates who need hospitalization can be severe, showing associations with high rates of ventilatory support and myocarditis. Cough, tachypnea, and retractions on admission suggest a severe disease course. Trial registration: ClinicalTrials.gov identifier: NCT04401540.What is Known:• Neonatal cases of COVID-19 infection are mainly reported as perinatal COVID-19 cases.• Neonates with perinatal transmission have a mild course and favorable prognosis.What is New:• Among symptomatic neonates with late-onset COVID-19 infection, fever was the most common symptom, and almost one quarter of hospitalized cases needed some type of respiratory support. Myocarditis was the most common complication.• The presence of cough, tachypnea, retractions, and a PT above 14 s were associated with an increased risk of severe COVID-19.
High-speed treatment of low strength domestic wastewater for irrigation water production in pilot-scale classical, moving bed and fixed bed hybrid MBRs
(2022-11-15) Tuluk B.; Yildiz E.; Nuhoglu A.; Tataroglu N.S.; Gulluce E.; Cengiz I.; Degermenci N.; Angin I.
To evaluate the treatability of domestic wastewater under conditions of low hydraulic retention time and high organic loadings, 3 pilot-scale automatically controlled membrane bioreactors (MBRs) as classical (C-MBR), moving bed (MB-MBR), and fixed bed (FB-MBR) were established and operated for a total of 268 days. Established pilot plants were compared in terms of treatment performance, membrane fouling, irrigation water criteria, and power consumption values. Results obtained have shown that all three systems were able to achieve more than 93% removal of chemical oxygen demand (COD) in an average hydraulic retention time (HRT) of 1 hour, and MB-MBR and FB-MBR were superior in terms of total nitrogen (TN) and total phosphorus (TP) removals. It has been determined that MB-MBR and FB-MBR are also advantageous in terms of power consumption. Especially it has been found that FB-MBR can produce better quality irrigation water with 40% lower power consumption than C-MBR under the same conditions. It was concluded that biofilm-supported hybrid systems could be a practical application in the fight against increasing water scarcity and global warming, both in obtaining clean water with less power consumption and in protecting human and environmental health.
Investigation of Mass Transfer of Ozone in Jet Loop Reactor
(2024-03-01) Cengiz I.; Değermenci N.; Yildiz E.; Barlak M.S.
Performance investigation of a jet loop membrane bioreactor for the treatment of an actual olive mill wastewater
(2016-12-15) Değermenci N.; Cengiz İ.; Yildiz E.; Nuhoglu A.
In this study, following the pre-treatment of olive mill wastewater (OMW), its treatment in a jet loop membrane bioreactor (JLMBR) was investigated. Among the pre-treatment options, the configuration composed of physical settling, cartridge filter and ceramic membrane showed the best performance in terms of investigated parameters. For the JLMBR that was fed by pretreated OMW, up to 93 and 87% removal efficiencies were achieved for the chemical oxygen demand (COD) and total phenol, respectively, at volumetric organic load (VOL) of 17.8 kg COD/m3 day. The calculated specific oxygen uptake rate (SOUR) values were in the range 7.7–34.7 g O2/kg MLVSS h. When even hydraulic retention times (HRT) values decreased by a factor of 1:24, system performance in terms of COD and total phenol removal remained almost stable. Decreasing the sludge retention time (SRT) to three days made considerable perturbations for the system performance, increasing the effluent COD and total phenol values in 900 and 80 mg/L, respectively. The JLMBR showed a high overall performance for the treatment of an actual OMW under the evaluated operational conditions.
The effect of education given to Turkish adolescents with Familial Mediterranean fever on anxiety, depression, and quality of life
(2023-01-01) Kaçan H.; Kaş Alay G.; Yildiz E.
To examine the effects of individual education given to Turkish adolescents with Familial Mediterranean fever (FMF) on anxiety, depression, and quality of life. The randomized controlled experimental study was performed on 70 adolescents aged 12–18 years who were diagnosed as having FMF between October 2021 and April 2022 in Turkey. The disease management education was offered individually to adolescents in the intervention group with a booklet entitled “FMF is under my control;” no intervention was applied to adolescents in the control group. The training booklet was prepared by the researchers in a multidisciplinary team and was finalized by taking expert opinions. In the data collection process, a personal information form, the State-Trait Anxiety Inventory for Children (STAI-CH), the children’s depression inventory (CDI), and the Pediatric Quality of Life Inventory (PedsQL) were used. After applying the scales specified in the pretest, individual training was given and the posttest was performed 2 months later using the same scales. After the education, there was a statistically significant decrease in the mean CDI score of the intervention group (p < 0.05), whereas there were statistically significant increases in mean scores obtained on PedsQL and its sub-scales (p < 0.05). However, the decrease in the mean STAI-CH score of the intervention group was not statistically significant (p > 0.05). There was no statistically significant difference in the mean STAI-CH, CDI, and PedsQL scores of the control group after the education (p > 0.05). Conclusion: The effectiveness of the individual education program for adolescents with FMF in improving quality of life and reducing levels of depression within the scope of disease management has been confirmed. It is recommended that all health professionals working with children with FMF regularly provide individual or group-planned education programs.What is Known:• The unpredictability of FMF attacks has a very negative effect on adolescents.• Individual education programs on FMF focus on children with a holistic approach.What is New:• To the best of our knowledge, this study is the first study to evaluate disease management education given to adolescents with FMF.• This is a pioneering study of the use of nurses in the education of adolescents with FMF and in fulfilling their educational roles.