The effects of aerobic/anoxic period sequence on aerobic granulation and COD/N treatment efficiency

2013-11
Erşan, Yusuf Çağatay
Bayramoğlu, Tuba Hande
The effects of period sequence (anoxic-aerobic and aerobic-anoxic) on aerobic granulation from suspended seed sludge, and COD, N removal efficiencies were investigated in two sequencing batch reactors. More stable granules with greater sizes (1.8-3.5 mm) were developed in R1 (anoxic-aerobic sequence). Yet, no significant difference was observed between the reactors in terms of removal efficiencies. Under optimum operational conditions, 92-95% COD, 89-90% TAN and 38-46% total nitrogen removal efficiencies were achieved. The anoxic-aerobic period sequence (R1) resulted in almost complete denitrification during anoxic periods while aerobic-anoxic sequence (R2) led to nitrate accumulation due to limited-carbon source and further granule disintegration. NH3-N concentration of 15-28 mg/L was found to inhibit COD removal up to 30%. This study also revealed the inhibitory sulfide production during anoxic periods. Sulfate concentration of 52.6-70.2 mg/L was found to promote sulfate reduction and sulfide generation (0.24-0.62 mg/L) which, together with free-ammonia, inhibited TAN oxidation by 10-50%.
Bioresource Technology

Suggestions

Investigation of the use of aerobic granules for the treatment of sugar beet processing wastewater
KOCATURK, İREM; Bayramoğlu, Tuba Hande (2015-10-18)
The treatment of sugar beet processing wastewater in aerobic granular sequencing batch reactor (SBR) was examined in terms of chemical oxygen demand (COD) and nitrogen removal efficiency. The effect of sugar beet processing wastewater of high solid content, namely 2255 +/- 250mg/L total suspended solids (TSS), on granular sludge was also investigated. Aerobic granular SBR initially operated with the effluent of anaerobic digester treating sugar beet processing wastewater (Part I) achieved average removal ef...
The effect of seed sludge type on aerobic granulation via anoxic-aerobic operation
Ersan, Yusuf Cagatay; Bayramoğlu, Tuba Hande (Informa UK Limited, 2014-12-01)
The effects of two seed sludge types, namely conventional activated sludge (CAS) and membrane bioreactor sludge (MBS), on aerobic granulation were investigated. The treatment performances of the reactors were monitored during and after the granulation. Operational period of 37 days was described in three phases; Phase 1 corresponds to Days 1-10, Phase 2 (overloading conditions) to Days 11-27 and Phase 3 (recovery) to Days 28-37. Aerobic granules of 0.56 +/- 0.23 to 2.48 +/- 1.28mm were successfully develope...
Influent COD/TAN ratio affects the carbon and nitrogen removal efficiency and stability of aerobic granules
KOCATURK, IREM; Bayramoğlu, Tuba Hande (2016-05-01)
Two identical sequencing batch reactors (SBRs) seeded with aerobic granules were operated with varying chemical oxygen demand/total ammonia nitrogen (COD/TAN) ratios (1-30). R1 was operated at increasing COD/TAN ratios (7.5, 10, 20, 30), while R2 was operated at decreasing COD/TAN ratios (7.5, 5, 3.5, 2, 1). The results indicated that high COD/TAN ratios (7.5-30) provided high COD removal efficiency (around 92%) and low TAN removal (33%), favoring heterotrophs that form white, fluffy flocs and large granule...
The growth behavior of Chlorella vulgaris in the presence of 4-chlorophenol and 2,4-dichlorophenol
ŞAHİNKAYA, Erkan; Dilek, Filiz Bengü (Elsevier BV, 2009-03-01)
Toxicity of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) on the growth of Chlorella vulgaris was investigated in batch reactors. Results revealed that 4-CP did not adversely affect the growth of algae up to 20 mg/L, however higher concentrations inhibited growth appreciably and no growth was detected at 100 mg/L. 4-CP also caused some physiological changes in the algal cells as increasing initial 4-CP concentration caused a linear decrease in chlorophyll a (chl-a) content of the cell. 2,4-DCP up t...
The inhibitory effects and removal of dieldrin continuous upflow anaerobic sludge blanket reactors
Bayramoğlu, Tuba Hande; DEMİRER, GÖKSEL NİYAZİ (Elsevier BV, 2003-09-01)
The inhibitory effects and removal efficiency of dieldrin (DLD) in anaerobic reactors were investigated. Anaerobic toxicity assay (ATA) experiments conducted in batch reactors revealed that 30 mg/l DLD had inhibitory effects on the unacclimated mixed anaerobic cultures. Continuous reactor experiments performed in a lab-scale two-stage upflow anaerobic sludge blanket (UASB) reactor system which was fed with ethanol as the sole carbon source, indicated that anaerobic granular cultures could be successfully ac...
Citation Formats
Y. Ç. Erşan and T. H. Bayramoğlu, “The effects of aerobic/anoxic period sequence on aerobic granulation and COD/N treatment efficiency,” Bioresource Technology, pp. 149–156, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28217.