Person: SEMERCİ, NESLİHAN
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SEMERCİ
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NESLİHAN
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Publication Metadata only Quantitative analysis of candidatus accumilibacter phosphatis on lab scale denitrifying phosphorus removal sequencing batch reactors(2012-08-19) KOCAMEMİ, BİLGE; SEMERCİ, NESLİHAN; Esen E., DİTYAPAK D., KURT H., Kumru M., KOCAMEMİ B., SEMERCİ N., AKARSUBAŞI A. T.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 Metadata only Evaluation of oxic and anoxic phosphate removal in a post-denitrification system(CURRENT BIOLOGY LTD, 2011) KOCAMEMİ, BİLGE; Semerci, Neslihan; Bakici, Nevin; Kocamemi, Bilge AlpaslanPublication Metadata only Combined and individual applications of ozonation and microwave treatment for waste activated sludge solubilization and nutrient release(ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2019) SEMERCİ, NESLİHAN; Cosgun, Sevil; Semerci, NeslihanThis study focused on the separate and combined applications of ozonation and microwave treatment to enhance the phosphorus and ammonia release from waste activated sludge. Twenty-six batch experiments were run with or without acidic (pH 2) and alkaline (pH 10) pretreatments and different ozone dosages. Also, microwave post treatments were applied to enhance phosphorus release efficiency. Results showed that ozonation is an effective technology for solubilization and release without any pre or post-treatment, reactive phosphorus content increased from 1.9 to 3.6 mg PO4-P/g MLSSin (89.5% increase) with 19.4% COD release. Alkaline pretreatment enhanced sludge solubilization and phosphorus release at most (23.9% COD release and 152.6% PO4-P increase); however, decreases in ammonia, calcium and magnesium concentrations pointed out a loss of a part of released phosphorus, due to struvite or apatite precipitation. Acidic pretreatment reduced the sludge solubilization during ozonation (10% COD release) but prevented the uncontrolled precipitation and enhanced the phosphorus release (115.8% PO4-P increase). For microwave treatment, acid pretreated sludge showed higher release than alkaline pretreated or neutral sludge. Among different process combinations, acid pretreatment/ozonation/microwave experiments have shown the highest sludge solubilization and nutrient release (48% COD release and 579% PO4-P increase); however, the difference between acid pretreatment/microwave and acid pretreatment/ozonation/microwave was not significant in terms of phosphorus release (479% PO4-P increase, p = 0.082). Thus, pH 2/microwave may be a cost-effective and feasible alternative for nutrient recovery from waste sludge. For struvite precipitation, pH 8.5 were determined as optimum level. Also using fine struvite particles as seed increased struvite precipitation efficiency.Publication Metadata only Inhibition of respiration and distribution of Cd, Pb, Hg, Ag and Cr species in a nitrifying sludge(ELSEVIER, 2010) SEMERCİ, NESLİHAN; Cecen, Ferhan; Semerci, Neslihan; Geyik, Ayse GuelThe study investigated the inhibitory effects of the heavy metals Cd, Pb, Hg, Ag and Cr (as Cr3+ and Cr6+) on a nitrifying sludge. The aim was to assess the IC50 concentrations leading to 50% inhibition. The method is based on respiration of nitrifying sludge in the presence of these metals. Both O-2 consumption and CO2 production were taken into account. The order of the inhibitory effect was Ag > Hg > Cd > Cr3+ = Cr6+. Metal speciation was calculated in terms of free metal, inorganic metal complexes and bound metal. Pb largely precipitated and 50% inhibition was never reached. Ag was always in the form of the free ion or labile complexes. Hg had apparently a lower toxicity than Ag, since most of it was initially highly complexed with ammonia. Cd was present in the form of free ion and complexes which caused inhibition although a large part of them were precipitated. The inhibitory effects of trivalent chromium (Cr3+) and hexavalent chromium (Cr6+) were similar. The latter was present in the form of the anion CrO42- and was not taken up by biomass. The study highlighted that IC50 values alone do not have an explanatory power of inhibition unless speciation is also considered. (C) 2010 Elsevier B.V. All rights reserved.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 Quantitative analysis of candidatus accumilibacter phosphatis on lab scale denitrifying phosphorus removal sequencing batch reactors(2012-08-19) SEMERCİ, NESLİHAN; KOCAMEMİ, BİLGE; Ergal İ., SEMERCİ N., KOCAMEMİ B., Kurt H., AKARSUBAŞI A. T.Publication Metadata only Effects of nitrite, oxygen and initial pH on biological phosphorus removal in a post-denitrification system(ELSEVIER SCIENCE BV, 2010) SEMERCİ, NESLİHAN; Semerci, Neslihan; Bakici, Nevin; Kocamemi, B. AlpaslanPublication Open Access Anammox start-up strategies: the use of local mixed activated sludge seed versus Anammox seed(IWA PUBLISHING, 2018-12-19) KOCAMEMİ, BİLGE; Kocamemi, Bilge Alpaslan; Dityapak, Duygu; Semerci, Neslihan; Keklik, Esra; Akarsubasi, Alper; Kumru, Mert; Kurt, HalilThe start-up period of Anammox systems is still a big challenge due to the unavailability of large volumes of slowly growing Anammox seed locally in most countries. This study aims to evaluate the effects of seeding strategy on the start-up and enrichment period of Anammox systems by monitoring both process performance and microbial population dynamics. Two different seeding strategies, the use of mixed activated sludge culture from a local STP and the use of enriched Anammox culture transported from abroad, were comparatively studied in SBR systems operated for 410 days. The enriched Anammox seed from abroad inhibited seriously during transportation. Anammox activity re-started after 195 days' recovery period. An active Anammox culture was successfully enriched within 95 days from a local activated sludge source without seeding any Anammox. The Anammox population reached levels of 10(11) copies/ng at the end of 410 days' enrichment period. Based on FISH, Ca. Brocadia anammoxidans and Ca. Scalindua species were dominant in the enriched culture. The maximum TNRR was observed as 430 mg N/day. DGGE analyses revealed a drastic change in the microbial community (56%) with Anammox enrichment. Phylogenetic analysis demonstrated a significant decrease in phylotype Proteobacteria and increase in phylotypes Planctomycetes, Chloroflexi and Acidobacteria with enrichment.Publication Metadata only Evaluation of pH, ORP and conductivity profiles in an Anammox reactor started-up using municipal activated sludge seed(CURRENT BIOLOGY LTD, 2011) KOCAMEMİ, BİLGE; Kocamemi, Bilge Alpaslan; Dityapak, Duygu; Semerci, Neslihan