Anaerobic mesophilic digestion of waste activated sludge in the presence of 2,3 ',4,4 ',5-pentachlorobiphenyl

The aim of this study was to investigate the anaerobic digestion of waste activated sludge in the presence of a model PCB congener, 2,3',4,4',5-pentachlorobiphenyl (PCB-118), and transformer oil (TO), and thereby PCB dechlorination under mesophilic digestion conditions. Two PCB-118 concentrations (1 and 20 mg/L) and one TO concentration (1.52 g/L) were studied. Beside the PCB concentrations, pH, ORP, TS, VS, VSS, TSS, tCOD, and sCOD were monitored throughout the reactor operations (159-day). Methane productions of PCB reactors were considerably lower than that of control reactor (R-C), indicating the negative effect of PCB on methane production. The highest COD removal, 56%, was observed in R-C, followed by 1 and 20 mg/L PCB-118 reactors (46.7% and 40.6% reduction), respectively. VS reductions were between 36 and 52%, with the lower removal in the higher PCB-118 containing reactor. About 12 and 22% PCB-118 removals were attained proportional to their initial concentrations, 1 and 20 mg/L, respectively.


Anaerobic mesophilic co-digestion of sugar-beet processing wastewater and beet-pulp in batch reactors
Alkaya, Emrah; Demirer, Göksel Niyazi (2011-03-01)
In this study, biochemical methane potential (BMP) assay was conducted to investigate the effect of waste mixing and F/M ratio on the co-digestion of wastewater and beet-pulp, in addition to the digestion of the wastes separately. In the studied F/M range (0.51–2.56 g COD/g VSS), observed treatment efficiencies (63.7–87.3% COD removal and 69.6–89.3% VS reduction) were indications of high biodegradability for both wastewater and beet-pulp, which decreased with increasing F/M. It was evident that the extent o...
Anaerobic biogasification of undiluted dairy manure in leaching bed reactors
Demirer, Göksel Niyazi; Chen, S. (Elsevier BV, 2008-01-01)
Dry anaerobic digestion of high solids animal manure is of increasing importance since conventional slurry digestion is not an effective system for these manures. The investment costs for large-size reactors, costs for heating these reactors, handling, dewatering, and the disposal of the digested residue decrease the benefits of conventional slurry anaerobic digestion for high solids animal manure. Even though leaching bed reactors (LBR) constitute a promising option for dry anaerobic biogasification of ani...
Anaerobic acidification of sugar-beet processing wastes: Effect of operational parameters
Alkaya, Emrah; Demirer, Göksel Niyazi (Elsevier BV, 2011-01-01)
The objective of this study was to maximize the hydrolysis and acidification of sugar-beet processing wastewater and beet pulp for volatile fatty acid (VFA) production through acidogenic anaerobic metabolism. Experiments were conducted to determine the optimum operational conditions (HRT, waste-mixing ratio and pH) for effective acidification in daily-fed, continuously mixed anaerobic reactors. For this purpose, reactors were operated at 35 +/- 1 degrees C with different combinations of HRT (2-4 days), wast...
Bioflocculation of activated sludge: The role of calcium ions and extracellular polymers
Sanin, Faika Dilek (Informa UK Limited, 2000-12-01)
In an attempt to identify the bioflocculation mechanisms, this study examines the role of calcium ions in flocculation of activated sludge. Two calcium specific chelants, ethylenebis (oxyethylenenitrilo)tetraacetic acid (EGTA) and sodium hexametaphosphate (HMT) are used to extract calcium ions. Both chemicals successfully extract the calcium ions from sludge structure, which is confirmed either by an increase in solution calcium concentration or by a decrease in calcium concentration in the sludge solid mat...
Kinetic modeling of enzymatic hydrolysis of pretreated kitchen wastes for enhancing bioethanol production
Çekmecelioğlu, Deniz (Elsevier BV, 2013-03-01)
It is well known that use of low cost and abundant waste materials in microbial fermentations can reduce product costs. Kitchen wastes disposed of in large amounts from cafeterias, restaurants, dining halls, food processing plants, and household kitchens contain high amounts of carbohydrate components such as glucose, starch, and cellulose. Efficient utilization of these sugars is another opportunity to reduce ethanol costs. In this study, the effect of pretreatment methods (hot water, acid solutions, and a...
Citation Formats
D. Kaya, İ. İmamoğlu, and F. D. Sanin, “Anaerobic mesophilic digestion of waste activated sludge in the presence of 2,3 ‘,4,4 ’,5-pentachlorobiphenyl,” INTERNATIONAL BIODETERIORATION & BIODEGRADATION, pp. 41–47, 2013, Accessed: 00, 2020. [Online]. Available: