Sequence of microbial, populations associated with the treatment of pulping effluents in a model activated sludge plant

Demirbas, GG
Gokcay, CF
Dilek, Filiz Bengü
A model activated sludge (AS) plant receiving pulping effluents was operated on two modes. One mode was the treatment in a dedicated plant receiving no inflow other than pulping effluents, seeded during start-up, and receiving a supplemental carbon source. The second mode was the co-treatment of pulping effluents with the municipal sewage, continuously seeded both by microorganisms and organics. Higher Adsorbable Organic Halide (AOX) removal was obtained at lower Solids Retention Times (SRTs) in the co-treating AS, whereas opposite was hue for the dedicated AS, i.e. high AOX removals at long SRTs. The AOX removal mechanism was mineralization in both modes.


Treatment of organic chlorine in pulping effluents by activated sludge
Demirbas, G.; Gokcay, C.F.; Dilek, Filiz Bengü (1998-09-25)
A model activated sludge (AS) plant was fed by pulping effluents from a straw and reed processing paper works. The model was initially operated to simulate a dedicated treatment plant by continuously receiving chlorinated effluents from the pulp bleachery. In this simulation cycle the model activated:sludge was seeded only once during start-up and did not receive any domestic sewage after that. A carbon source was added in some of the experiments to bring up the organic content. In the second simulation cyc...
Treatment of chlorinated organics in bleached Kraft mill effluents by activated sludge process
Ataberk, S; Gökçay, Celal Ferdi (1997-01-01)
Combined effluents from a bleached Kraft pulp mill using annual plants were treated in a lab-scale activated sludge (AS) system. The effects of operating solids retention time (SRT) and concentration of additional carbon source on AOX removal were investigated. Higher AOX removals (30%) were observed with long SRTs, 99% of which was pure metabolization. As SRT was decreased AOX removal efficiency also decreased (4%) and principal AOX removal mechanism changed to adsorption onto wasted biomass. The AOX remov...
Investigation into the microbiology of a high rate jet-loop activated sludge reactor treating brewery wastewater
Dilek, Filiz Bengü; Bloor, J. (1996-06-28)
The microbiology of a jet loop activated sludge reactor treating brewery wastewater has been investigated, with a venturi system combining liquid pumping with air diffusion being the basic feature of the system. The high F/M ratio, the high growth rate of the bacteria and the high levels of turbulence registered in the jet loop reactor caused the disappearence of filamentous bacteria and the production of a cloudy effluent. The population in the reactor was mainly formed by aerobic bacteria all belonging to...
Contribution of Pd Membrane to Dehydrogenation of Isobutane Over a New Mesoporous Cr/MCM-41 Catalyst
ÇETİNYOKUŞ, SALİHA; DOĞAN, MELTEM; Doğu, Timur (2016-06-01)
A chromium incorporated mesoporous silicate structured Cr/MCM-41 type catalyst was synthesized following a one-pot hydrothermal route and tested in dehydrogenation of isobutane to isobutene in a Pd membrane reactor. Characterization results of the catalyst proved that it had ordered pore structure with a narrow pore size distribution. This catalyst showed quite high activity for the dehydrogenation of isobutane. Membrane reactor tests performed at 823 K proved the advantages of in-situ removal of produced h...
Effect of carbon to nitrogen ratio on the composition of microbial extracellular polymers in activated sludge
Durmaz, B; Sanin, Faika Dilek (2001-01-01)
Effect of carbon to nitrogen ratio (C/N) on the sludge extracellular polymer composition is studied in synthetically fed semi-continuous reactors with 8 days of sludge age. Results show that C/N ratio influences the relative distribution of polymer carbohydrate and protein. At low C/N ratio of 5, polymer extracts have high protein and low carbohydrate content. As the C/N ratio is increased to 17.5 and then to 40, carbohydrate concentration increases sharply and protein concentration decreases.
Citation Formats
G. Demirbas, C. Gokcay, and F. B. Dilek, “Sequence of microbial, populations associated with the treatment of pulping effluents in a model activated sludge plant,” FRESENIUS ENVIRONMENTAL BULLETIN, pp. 114–119, 1998, Accessed: 00, 2020. [Online]. Available: