Effects of hydraulic residence time on metal uptake by activated sludge

Date

2005-01-01

Author

Ozbelge, TA
Özbelge, Hilmi Önder
Tursun, M

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

186
views

0
downloads

The combined uptake Of Cu2+ and Zn2+ by activated sludge (biomass) was investigated at steady state in an activated sludge process (ASP) without recycle (namely, once-thro ASP), for different values of influent metal concentrations and hydraulic residence time in the range of 2.5-40 h. The experiments were performed at a constant pH of 7 and temperature of 25 degreesC. The results showed that the percentage removal of both copper and zinc by activated sludge increased with the increasing residence time; moreover, the percent metal uptakes were higher for both metals at the low level of influent metal concentrations [rho(Cu2+) = 1.5 mg/L and rho(Zn2+) = 9 mg/L], than those at the higher level of concentrations [rho(Cu2+) = 4.5 mg/L and rho(Zn2+) = 27 mg/L]. The least represented forms of both Cu2+ and Zn2+ in activated sludge were their sulfides, and the dominant metal forms were found to be 'organically bound' for both of the metals, Zn2+ and Cu2+.

Subject Keywords

Industrial and Manufacturing Engineering, Process Chemistry and Technology, Energy Engineering and Power Technology, General Chemistry, General Chemical Engineering

URI

https://hdl.handle.net/11511/51523

Journal

CHEMICAL ENGINEERING AND PROCESSING

DOI

https://doi.org/10.1016/j.cep.2004.04.004

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Effect of Midsynthesis Addition of Silica to the Synthesis Medium on the Properties of MFI-Type Zeolite Membranes Soydas, Belma; Kalıpçılar, Halil; Culfaz, Ali (American Chemical Society (ACS), 2010-06-02) Thin zeolite membranes of MFI type were prepared on alpha-Al2O3 supports by midsynthesis addition of silica in a recirculating flow system at 95 degrees C The synthesis was started with the batch composition of 80SiO(2): 30TPAOH:1500H(2)O which was changed to 80SiO(2)center dot 9TPAOH:1500H(2)O by addition of silica Mkt 24, 48, or 72 h Compared to synthesis at constant composition. it is possible to affect the rates of nucleation and crystal growth to obtain membranes with better quality by changing the ove...
Effects of operational parameters and ultrasonic pretreatment on supercritical CO2 extraction of diesel fuel from soil Guvenc, A; Mehmetoglu, U; Mehmetoglu, T (Informa UK Limited, 2004-01-01) Supercritical fluid extraction (SFE) using CO2 was performed on soil material artificially contaminated with diesel fuel. Raising the temperature from 313 K to 343 K caused the recovery efficiency to increase from 52 to 76%. Pressure and CO2 flow rate were found to be less important. As expected, increasing extraction time resulted in higher recoveries. Ultrasonic pretreatment of the soil material was found to be very effective, possibly due to disrupting the strong interaction bonding between soil matrix a...
Effect of hydrogen ion-exchange capacity on activity of resin catalysts in tert-amyl-ethyl-ether synthesis Boz, N; Doğu, Timur; Murtezaoglu, K; Dogu, G (Elsevier BV, 2004-08-10) Activities of ion-exchange resin catalysts, having different hydrogen exchange capacities ranging between 5.1 and 1.3 meq H+/g, on the etherification reactions of 2M1B (2-methyl-1-butene) and 2M2B (2-methyl-2-butene) with ethanol were experimentally tested in a fixed bed reactor. These catalysts were prepared by the heat treatment of Amberlyst-15 catalysts at 220 degreesC at different durations of time and also by the synthesis of sulfonated styrene divinyl benzene cross-linked resins. Activity of these cat...
Removal of phenolic compounds from rubber-textile wastewaters by physico-chemical methods Ozbelge, TA; Ozbelge, OH; Baskaya, SZ (Elsevier BV, 2002-09-01) Removal of phenolic compounds from rubber-textile wastewaters (RTWWs) by physico-chemical process was investigated by using four different types of coagulants (Al-2(SO4)(3), Fe-2(SO4)(3), FeSO4, FeCl3) with or without lime (Ca(OH)(2)) addition, in jar-test experiments. The RTWWs of the present tire-cord fabric plant may contain seven different types of dipping solutions (DSs), which provide an adhesive property to the fabric. The optimum results were obtained by using 50% FeCl3 solution and lime at various ...
Effect of fluorine substituted benzothiadiazole on electro-optical properties of donor-acceptor-donor type monomers and their polymers Çakal, Deniz; Önal, Ahmet Muhtar (Elsevier BV, 2020-11-01) A series of trimeric monomers bearing thiophene donor units and fluorinated analogues of benzothiadiazole acceptor units was synthesized via donor-acceptor-donor approach and polymerized electrochemically in order to investigate the effect of fluorine atom on electro-optical properties of both monomers and their corresponding polymers. All monomers exhibited solvatochromic and fluorescent properties. The introduction of fluorine atom into the conjugated backbone increased the oxidation potentials. Upon movi...

Citation Formats

T. Ozbelge, H. Ö. Özbelge, and M. Tursun, “Effects of hydraulic residence time on metal uptake by activated sludge,” CHEMICAL ENGINEERING AND PROCESSING, pp. 23–32, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51523.