Effect of Ni (II) and Cr (VI) on activated sludge kinetics

Yetiş, Ülkü


Effect of extracellular polymer composition of activated sludge on the removal of heavy metals by biosorption
Yüncü, Bilgen; Yetiş, Ülkü; Sanin, F. Dilek; Department of Environmental Engineering (2003)
Activated sludge microorganisms can remove many hazardous substances from wastewater by adsorbing and concentrating them on their surfaces. Biosorption of these substances onto activated sludge surfaces are influenced by the chemical properties of the substance in question as well as the surface properties of the microorganisms. The purpose of this study is to identify the biosorption mechanisms of heavy metals and the effect of extracellular polymer (ECP) composition of activated sludge on the biosorption ...
Effects of ultrasound pretreatment and anaerobic digestion on the energy potential of sludge
Çelebi, Emrehan Berkay; Sanin, Faika Dilek; Aksoy, Ayşegül; Department of Environmental Engineering (2015)
The by-product of wastewater treatment, sludge, is generated in tons everyday all around the world. As environmental regulations in Turkey are becoming stricter during the European Union adaptation period, the previously wide-spread disposal method of landfilling the sludge will not be applicable. Instead, dried sludge is expected to be used in revenue generating methods like land application or combustion. Combustion can be thought of as more beneficial as it uses sludge as an energy source. However, it is...
Effect of swaging on microstructure and tensile properties of W-Ni-Fe alloys
DURLU, NURİ; Caliskan, N. Kaan; Bor, Sakir (Elsevier BV, 2014-01-01)
The objective of this study was to investigate the effect of swaging on the microstructure and tensile properties of high density two phase alloys 90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe. Samples were liquid phase sintered under hydrogen and argon at 1480 degrees C for 30 min and then 15% cold rotary swaged. Measurement of microstructural parameters in the sintered and swaged samples showed that swaging slightly increased tungsten grain size in the longitudinal direction and slightly decreased tungsten grain size i...
Removal of lead using anaerobic biomass
Tokcaer, Emre; Yetiş, Ülkü; Department of Environmental Engineering (2003)
Use of anaerobically digested sludge (ADS) in heavy metal removal, was researched. The raw and dewatered ADS samples collected from the effluent of anaerobic digesters and mechanical dewatering units of Ankara City Wastewater Treatment Plant were used. Sorption kinetic and equilibrium tests were conducted using raw ADS at initial pH of 2.0, 4.0 and without adjusting the initial pH. The highest Pb(II) removal capacity was observed as, 8.5 mmol (or 1760 mg) Pb(II) per g of biomass, when the initial pH was not...
Kinetic aspects of activated sludge process treating Ni(II) and Cr (VI) : effect of substrate concentration and ion combinations
Dilek, Filiz Bengü; Gökçay, Celal Ferdi; Department of Environmental Engineering (1991)
Citation Formats
Ü. Yetiş, “Effect of Ni (II) and Cr (VI) on activated sludge kinetics,” Ph.D. - Doctoral Program, Middle East Technical University, 1988.