Person: SEMERCİ, NESLİHAN
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SEMERCİ
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NESLİHAN
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Publication Open Access Performance and characteristics of dynamic membranes for dairy wastewater treatment under anaerobic conditions(2023-01-01) SEMERCİ, NESLİHAN; Paçal M., SEMERCİ N.© 2023, The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University.The aim of this study was to treat dairy wastewater by using an anaerobic dynamic membrane bioreactor equipped with a 20-µm polyester mesh filter and at organic loading rate of 8.1 ± 1.5 kg COD/(m3 day). The dynamic membrane was formed in 42 d, and the operation was continued for additional 50 days. In order to prevent membrane fouling and to ensure efficient cake layer formation, a wide range of cross flow velocity ranging from 5 m/h to 54 m/h was applied until a stable cake layer was formed. The chemical oxygen demand removal efficiency was 85 ± 9% in the dynamic membrane formation period (Day 0–42). In the stable operational period, the chemical oxygen demand removal improved by more than 10% owing to the well-developed Dynamic Membrane. Carbon, calcium, phosphorus, oxygen, and sulfur elements were detected in selected points of the dynamic membrane layer. Proteins and polysaccharides were detected in the dynamic membrane layer as organic compounds. The inorganic compounds in dynamic membrane layer were detected and found as 1.16% sodium, 1.50% magnesium, 0.76% potassium, 3.34% calcium, and 0.41% iron in mass concentration. The analysis results showed that organic and inorganic materials led to the formation of a strict/dense cake layer.Publication Open Access Phosphate recovery from sewage sludge supernatants using magnetic nanoparticles(ELSEVIER, 2021-04) SEMERCİ, NESLİHAN; Gulyas, Anett; Genc, Seval; Can, Zehra Semra; Semerci, NeslihanPhosphorus removal and recovery from synthetic solutions and sewage sludge supernatants by using magnetic nanoparticles (MNP) were investigated through batch adsorption experiments. The adsorption kinetics and isotherms on the removal of phosphate have been studied using different MNP doses, contact time, pH, and initial P concentrations. Reusability of the MNP and the enrichment of phosphate in desorption solution from dewatering supernatants were tested in a series of adsorption-desorption cycles. The removal efficiency was between 29 and 97 % after 24 h depending on the P concentrations and adsorbent concentrations. This efficiency was detectable in pH similar to 3-5 but decreased in case of increased pH levels. Intra particle (IP) diffusion model kinetic tests demonstrated that the adsorption process was controlled by a multi-step mechanism and the reaction equilibrium was reached after 120 min. Besides phosphate, ammonium, magnesium and calcium ions were adsorbed on MNP to a lesser extent. Surface characterization and adsorption mechanism were discussed based on XRD, SEM and FTIR analyses. MNP can be very effective for both ammonia and phosphate removal and recovery from dewatering supernatant solutions.Publication Metadata only Comparison of dried sludge and sludge ash for phosphorus recovery with acidic and alkaline leaching(WILEY, 2021) SEMERCİ, NESLİHAN; Semerci, Neslihan; Ahadi, Saifurahman; Cosgun, SevilNowadays, the recovery of phosphorus has been in the spotlight due to its importance for food security and depleting sources. In this study, phosphorus recovery from dried sewage sludge and sludge ash by acid and alkaline leaching was evaluated. Optimum extraction time and temperature were determined as two hours and ambient temperature. Results showed the superiority of strong acidic conditions for leaching; 75 ml/g with 0.4N HCl and 25 ml/g with 0.6N HCl were determined as optimum conditions to achieve efficient phosphorus dissolution from sludge ash (94.6%) and dried sludge (91.1%), respectively, with the lower heavy metal concentrations. Lower L/S ratio put forward the dried sludge as a more advantageous resource for phosphorus extraction. Besides, by alkaline leaching of sludge ash and dried sludge, 60.3 and 70.3% phosphorus dissolutions were achieved with 75 ml/g and 1N NaOH; and the leachate was a suitable product for phosphorus precipitation due to its high pH.Publication Open Access Biological recovery of phosphorus from waste activated sludge via alkaline fermentation and struvite biomineralization by Brevibacterium antiquum(2022-04-01) SEMERCİ, NESLİHAN; Cosgun S., Kara B., Kunt B., Hur C., SEMERCİ N.Struvite biomineralization is a promising method for phosphorus recovery from wastewater treatment plant streams, and the growth of responsible microorganisms in mixed cultures is one of the most critical points for applying this process in pilot and full-scale. This study aimed to investigate the growth and bio-struvite production of Brevibacterium antiquum in mixed sludge culture. Alkaline fermentation was applied at different pH conditions to enhance the phosphorus content of sludge for an efficient recovery, and pH 8 was determined as the most feasible considering the phosphorus release and sludge characteristics. Growth optimization studies showed that NaCl\"s presence decreases the growth rate of Brevibacterium antiquum and bio-struvite production. At the same time, pH in the range of 6.8-8.2 did not alter the growth significantly. In addition, studies showed the ability of Brevibacterium antiquum in unsterilized fermented sludge centrate to grow and recover the phosphorus as struvite. Thus, our results indicated the potential of struvite biomineralization in full-scale wastewater treatment plants.