Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co-treatment

Ozkan-Yucel, Umay Gokce
Gökçay, Celal Ferdi
The effect of a reactive azo dye (the hydrolyzed form of Reactive Orange 107, HRO107) on the digestion of municipal waste sludge (WS) was studied. The study also focused Oil the effect: of acclimation of the anaerobic mixed culture on dye treatment. Anaerobic batch assays were carried out in serum bottles under mesophilic conditions. Unacclimated and acclimated anaerobic mixed cultures were used for the study. Both unacclimated and acclimated anaerobic cultures completely reduced HRO107 during WS digestion. Inhibitory HRO107 concentration was found to be 800 mg/L for unacclimated mixed culture. Acclimation increased the inhibitory concentration level from 800 to 3200 mg/L. Sulfanilic acid and four other unidentified dye reduction end products were detected at the end of the assays. The results of this study indicated that anaerobic municipal WS digesters have the potential to be a cost efficient and effective pre treatment method.


Effect of Anaerobic Azo Dye Reduction on Continuous Sludge Digestion
Ozkan-Yucel, Umay Gokce; Gökçay, Celal Ferdi (Wiley, 2014-10-01)
Effect of continuous feeding of a reactive azo dye, reactive orange 107, and its hydrolyzed form (HRO107), on a conventional anaerobic digester was investigated in this study together with observation of change in microbial community. Laboratory-scale digesters were fed with waste activated sludge and azo dye for 575 days continuously. The influent concentrations of reactive azo dye were between 200 and 3200 mg/L. The digester performance was not adversely affected by azo dye and its reduction metabolites t...
Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge
Koksoy, Gozde T.; Sanin, Faika Dilek (IWA Publishing, 2010-01-01)
Sludge pretreatment by mechanical, chemical or thermal methods before anaerobic digestion has been applied to increase the digestability of excess sludge Pretreatment processes rely on their ability to disrupt cell membranes and to release organic materials from the cells into the aqueous phase Pretreatment by mechanical disintegration has grown rapidly in recent years in parallel with the advances in technology Ultrasonic sludge disintegration one of the most commonly used mechanical pretreatment methods- ...
Effects of nickel, chromium and initial feed concentration on the batch growth of a microbial consortium developed from sewage
Gökçay, CELAL FERDİ; Dilek, Filiz Bengü (Informa UK Limited, 1991-01-01)
Effects of nickel, chromium and substrate concentration on the microbial growth of acclimatized and unacclimatized microbes of sewage origin were studied in batch cultures at a constant temperature of 25 °C, at pH 7.0. A synthetic medium supplemented with Ni(II) (5 and 10 mgl‐1) or Cr(VI) (1 and 50 mgl‐1) or with their combinations and at various feed concentrations (650, 975, 1300 mgl‐1) was employed to investigate the effects on the specific growth rate (μm) of the microbial culture. The experimental resu...
SURUCU, G; Sanin, Faika Dilek (Elsevier BV, 1989-11-01)
This study investigates the effect of aeration basin temperature, pH and dissolved oxygen (DO) concentration on filterability and compressibility characteristics of activated sludge. Laboratory-scale semi-continuous reactors, fed with synthetic wastewater were used. Effects of temperatures of 15, 20, 25, 30, 35°C; pH values of 5.7, 7.2, 8.2, 9.0 and DO concentrations of 0.5, 1.0, 1.5, 2.0, 5.0 ml/l were studied by keeping all the other parameters constant in each case. Results indicated that as the operatin...
Effects of heavy metals on activated sludge process
Dilek, Filiz Bengü; Yetiş, Ülkü (1992-01-01)
The purpose of this study was to evaluate the toxic effects nf various heavy metals on activated sludge process. Different concentrations of Cu(II) (0.5, 1.0, 5.0, and 10.0 mg/l), Ni(II) (5.0, 10.0, 25.0 mg/l), and Cr(VI) (1.0, 5.0, 10.0, 25.0, 50.0 mg/l) were maintained in a laboratory-scale completely mixed activated sludge unit, without recycle, treating simulated wastewater. The feed solution contained 650 mg/l protein (corresponding to 1300 mg/l COD) as a source nf carbon. Experimental results indicate...
Citation Formats
U. G. Ozkan-Yucel and C. F. Gökçay, “Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co-treatment,” CLEAN-SOIL AIR WATER, pp. 387–393, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/58025.