Effect of Anaerobic Azo Dye Reduction on Continuous Sludge Digestion

Ozkan-Yucel, Umay Gokce
Gökçay, Celal Ferdi
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 throughout the study. A HRO107 concentration with 3200 mg/L was not inhibitory for the digester performance after prolonged exposure. The dye removal efficiencies were between 95 and 99% most of the time of operation implying that dye removal efficiency was not affected by variations in organic loading rate or influent dye concentration. Sulfate-reducing bacteria may increase in the digester but did not cause any toxicity due to hydrogen sulfide formation after prolonged feeding.


Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co-treatment
Ozkan-Yucel, Umay Gokce; Gökçay, Celal Ferdi (Wiley, 2010-04-01)
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....
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- ...
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...
Aerobic Bacterial Degraders With Their Relative Pathways for Efficient Removal of Individual BTEX Compounds
Yavas, Alper; İçgen, Bülent (Wiley, 2018-11-01)
Benzene, toluene, ethylbenzene, and xylene (BTEX) compounds are of great environmental concern due to their toxicity and carcinogenicity. Bacterial removal of BTEX has proven to be highly efficient, cost-effective, and nondisruptive, provided that, efficient bacterial degraders are available. The objective of this study, therefore, is to discover aerobic bacterial degraders with their relative pathways that could be employed for the efficient removal of individual BTEX compounds. A total of 22 petroleum hyd...
Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge
Çelebi, Emrehan Berkay; Aksoy, Ayşegül; Sanin, Faika Dilek (Springer Science and Business Media LLC, 2020-05-01)
In this study, effects of ultrasound pretreatment on combustion characteristics and elemental composition of municipal sludge were examined for energy-based evaluation of sludge pretreatment. Waste activated sludge (WAS) from a municipal wastewater treatment plant was pretreated with ultrasound at varying durations and was subjected to anaerobic digestion in a biochemical methane potential (BMP) assay. Changes in gas production rates, calorific value (CV), elemental compositions, and ash contents of sludge ...
Citation Formats
U. G. Ozkan-Yucel and C. F. Gökçay, “Effect of Anaerobic Azo Dye Reduction on Continuous Sludge Digestion,” CLEAN-SOIL AIR WATER, pp. 1457–1463, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51823.