Fulya Aydın Temel

Removal of lead (II) from aqueous solution by batch adsorption on various inexpensive adsorbents using experimental design

AbstractThis study focuses on adsorption of lead (II) using various inexpensive adsorbents, such as dried activated sludge, diatomite, and sepiolite, through the batch process. The data were evaluated using three types of isotherm models to determine the design parameters. Additionally, the adsorption kinetics was analyzed using first- and second-order kinetics. The regression coefficient (R2) quantitatively evaluates the correlation between the experimental data and the predicted responses. The Box–Behnken design of three factors at three levels was used to determine the important parameters affecting the adsorption of lead (II) by different adsorbents and the results showed that pH, initial concentration, and type of adsorbent in these experiments are the important factors. The Freundlich isotherm model fits for all adsorbents, as indicated by the R2 values of 0.992, 0.997, and 0.997 for Pb2+ adsorption onto dried activated sludge, diatomite, and sepiolite at pH 3, respectively. The adsorption capacity ...

Full scale horizontal subsurface flow constructed wetlands to treat domestic wastewater by Juncus acutus and Cortaderia selloana

ABSTRACT In the present study, a full scale horizontal subsurface flow constructed wetland was designed, constructed and operated to treat domestic wastewater of Kızılcaören village in Samsun city of Turkey. The total surface area of HSFCW was divided into equal parts. The effects of Juncus acutus L. and Cortaderia selloana (Schult.Schult.f.)Asch.&Graebn. on pollutants removal in HSFCWs were evaluated with the meteorological factors. The average removal efficiencies of J. acutus and C. selloana were determined as 60.3–57.7% for BOD; 24.2–38.9% for TN; 31.4–49.8% for OM; 35.4–43.3% for TP; 18.9–27.1% for orthophosphate; 24.4–28.7% for NH4-N; 29.5–37.2% for TSS; and 35.3–44.3% for TSM. Two-way ANOVA was applied to determine any difference for the removal of all parameters between the plant types and months on the mean values of contaminant removal. A correlation matrix of all parameters was determined. Subsurface flow constructed wetland was found quite efficient for the treatment of domestic wastewater in rural settlements. HSFCW is also more economical to install and maintain than a conventional wastewater treatment system while enhancing ecosystem services.

Endüstriyel Sızıntı Suyundan Pb(II) Giderimi İçin Genleştirilmiş Perlit Kullanımı: Kinetik Çalışmalar

Geliş 08 Aralık 2017 Kabul 17 Ocak 2018 Bu çalışmada, genleştirilmiş perlit kullanılarak endüstriyel sızıntı suyundan adsorpsiyon yöntemi ile Pb(II) gidermi araştırılmıştır. Pb(II) gideriminde pH, temas süresi ve adsorbent miktarının etkisi değerlendirilmiştir. Adsorpsiyon mekanizmasını değerlendirmek için Elovich modeli, partikül içi difüzyon (Weber-Morris) ve yalancı ikinci derece reaksiyon kinetiği modeli olmak üzere üç kinetik model test edilmiştir. Sonuç olarak, genleştirilmiş perlit üzerine Pb(II) adsorpsiyonu için en iyi uyum gösteren kinetik model olarak yalancı ikinci derece reaksiyon kinetiği modeli tanımlanmıştır (R>0.99). Kimyasal adsorpsiyon, endüstriyel sızıntı suyundan kütle transferi yerine adsorpsiyon işleminin belirleyici aşamasıdır. Partikül içi difüzyon modelinden elde edilen verilere göre, adsorpsiyon birden fazla adımdan oluşmaktadır. Son kısımdaki adsorpsiyonun partiküller arası difüzyon olduğu gerçeğine dayanırken birinci bölümdeki adsorpsiyon film difüzyonudur. Pb(II)’nin genleştirilmiş perlit üzerindeki adsorpsiyonunda film difüzyonu ve partikül içi difüzyon işlemleri anlamlıdır. Bu çalışmadan elde edilen sonuçlar, genleştirilmiş perlitin endüstriyel sızıntı suyundan adsorpsiyon yoluyla Pb(II)’nin giderilmesi için etkili bir alternatif adsorbent olduğunu göstermektedir. Anahtar Kelimeler: Genleştirilmiş perlit Adsorpsiyon Kurşun Arıtım Kinetik.In this study, the removal efficiency of Pb(II) from industrial leachate was investigated by using expanded perlite by adsorption. The effects of pH, contact time, and adsorbent dosage were examined on the Pb(II) removal. The adsorption kinetics were tested to understand the adsorption mechanism using three kinetic models, i.e., Elovich, intraparticle diffusion, and the pseudo second order reaction kinetic models. As the result, the best conformity kinetic model for Pb(II) adsorption on expanded perlite was described as the pseudo second-order (R2>0.99). It is indicated that chemisorption is the determining step of adsorption process rather than mass transfer from industrial leachate. According to the data obtained from intraparticle diffusion model, the adsorption is composed of more than one step. This can be attributed to the fact that the adsorption in the final portion was the intraparticle diffusion while the adsorption in the first portion was the film diffusion. Both film diffusion and intraparticle diffusion processes in the adsorption of Pb(II) on expanded perlite are significant. This study indicated that expanded perlite was an influential alternative adsorbent for the removal of Pb(II) by adsorption from industrial leachate.