Person: KOCAMEMİ, BİLGE
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KOCAMEMİ
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BİLGE
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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 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 Real-time process dynamics monitoring in Anammox reactors(IWA PUBLISHING, 2014) KOCAMEMİ, BİLGE; Kocamemi, B. Alpaslan; Dityapak, D.Process dynamics in Anammox systems were evaluated through continuous monitoring of pH, oxidation reduction potential (ORP) and conductivity in two separate newly started-up sequencing batch reactors, one seeded with an enriched Anammox sludge and the other seeded with mixed activated sludge. The pH and ORP profiles exhibited characteristic patterns depending on the process dynamics during early start-up, start-up and enrichment phases of the operational period of 410 days. The simultaneously continuing processes of the start-up period showed apparent indicative trend lines in pH and ORP profiles. Conductivity profiles were consistent with the process dynamics in all phases. During the enrichment phase, conductivity decreases could quantitatively be related to process removal efficiencies and all real-time profiles exhibited specific break-points which coincided with the end of Anammox in each cycle. The end of Anammox was observed as an 'apex' on pH profiles and a 'valley' on ORP profiles. The 'apex' and 'valley' points exactly coincided with the end point of the linear decrease in the conductivity profiles. The overall findings suggested a great potential in using real-time pH, ORP and conductivity measurements for quick and reliable monitoring of Anammox systems during start-up and enrichment periods.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 Overcoming challenges in mainstream Anammox applications: Utilization of nanoscale zero valent iron (nZVI)(ELSEVIER, 2019) KOCAMEMİ, BİLGE; Erdim, Esra; Ozkan, Zeynep Yucesoy; Kurt, Halil; Kocamemi, Bilge AlpaslanAlthough Anammox process is a proven technology for sidestream nitrogen removal, the process faces challenges for mainstream applications in sewage treatment plants (STPs). The aim of this study was to investigate the effect of zero valent iron nanoparticles (nZVI) on process performance to eliminate confronts for mainstream applications. An SBR (sequencing batch reactor) system was fed with various nZVI concentrations (0.04-5000 ppb) within 310 days of operation. Ammonium (NH4+N) and nitrite (NO2-N) removal rates showed 58% increase in daily measurements and 73% increase in instant measurements. Specific Anammox Activity (SAA) was noticeably higher on the days the system was exposed to nZVI compared to the unexposed days. EPS secretion, which enhances granulation of Anammox bacteria was favored by nZVI. Despite lower sludge retention time (SRT) values, the fraction of Anammox bacteria in total bacteria reached to 91-92% implying a boosting effect of nZVI on growth rate of Anammox bacteria. High Resolution Melting (HRM) analyses showed that four distinct clades were present in the reactor. (C) 2018 Elsevier By. All rights reserved.Publication 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, NeslihanPublication Metadata only Biological removal of the xenobiotic trichloroethylene (TCE) through cometabolism in nitrifying systems(ELSEVIER SCI LTD, 2010) KOCAMEMİ, BİLGE; Kocamemi, B. Alpaslan; Cecen, F.In the present study, cometabolic TCE degradation was evaluated using NH(4)-N as the growth-substrate. At initial TCE concentrations up to 845 mu g/L, WE degradation followed first-order kinetics. The increase in ammonium utilization rate favored the degradation of TCE. This ensured that biological transformation of TCE in nitrifying systems is accomplished through a cometabolic pathway by the catalysis of non-specific ammonia oxygenase enzyme of nitrifiers. The transformation yield (T(y)) of TCE, the amount of TCE degraded per unit mass of NH(4)-N, strongly depended on the initial NH(4)-N and TCE concentrations. In order to allow a rough estimation of TCE removal and nitrification at different influent TCE and NH(4)-N concentrations, a linear relationship was developed between 1/T(y) and the initial NH(4)-N/TCE ratio. The estimated T(y) values lead to the conclusion that nitrifying systems are promising candidates for biological removal of TCE through cometabolism. (C) 2009 Elsevier Ltd. All rights reserved.Publication Metadata only Accelerating biofilm formation in a single stage mainstream deammonification moving bed biofilm reactor (MBBR): The use of nZVI and polymers(2019-10-01) ERKEN, ESRA; KOCAMEMİ, BİLGE; ÇELİK S., YETGİN S., ERKEN E., KOCAMEMİ B.Publication Metadata only Cometabolic degradation and inhibition kinetics of 1,2-dichloroethane (1,2-DCA) in suspended-growth nitrifying systems(TAYLOR & FRANCIS LTD, 2010) KOCAMEMİ, BİLGE; Kocamemi, B. Alpaslan; Cecen, F.Cometabolic degradation of 1,2-dichloroethane (1,2-DCA) and its inhibitory impact on nitrification were investigated by the use of a mixed suspended-growth culture enriched for nitrifiers. 1,2-DCA was found to be cometabolically degradable by the nitrifier culture. This degradation rate was found to be dependent on the initial 1,2-DCA level. The first-order 1,2-DCA degradation rate constants ranged between 0.42 and 0.87 L (g VSS)(-1) h(-1). Increase in NH4-N utilization favoured cometabolic degradation of 1,2-DCA. The amount of 1,2-DCA degraded per unit mass of NH4-N strongly correlated with initial NH4-N and 1,2-DCA concentrations, ranging between 50 mg L-1 and 200 mg L-1 and 1600 mu g L-1 and 100,000 mu g L-1, respectively. The presence of 1,2-DCA caused inhibition of oxygen uptake and NH4-N utilization. In spite of the adverse effect of 1,2-DCA on the nitrifying biomass, the system had a high capacity for cometabolic removal of this compound even at inhibitory concentrations. 1,2-DCA had mainly mixed inhibitor characteristics, but at low concentrations (<25,000 mu g/L) it acted rather as a competitive inhibitor. The inhibition constants belonging to 1,2-DCA, K-ic (the dissociation constant of the enzyme-inhibitory compound complex) and K-iu (the dissociation constant of the enzyme-substrate-inhibitory compound complex) were determined to be 6000-8000 mu g L-1 and 188,000200,000 mu g L-1, respectively.