Influent COD/TAN ratio affects the carbon and nitrogen removal efficiency and stability of aerobic granules

Date

2016-05-01

Author

KOCATURK, IREM
Bayramoğlu, Tuba Hande

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

190
views

0
downloads

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 granules. Maintenance of high treatment efficiency and granular stability is hard due to high growth rate of heterotrophs. On the other hand, low COD/TAN ratios (2-5) provided high TAN removal efficiency up to 100%, while COD removal was relatively low (60%); leading to small, dense, orange granules enriched in nitrifiers with slow-growing but stable characteristics. The optimum COD/TAN ratio in terms of high COD and TAN removal and granular stability was found as 7.5. It was found out that bacterial population distribution among nitrifiers and heterotrophs can be adjusted by changing influent COD/TAN ratios. This study also proposed the polysaccharide to protein (PS/PN) ratio in the extracellular polymeric substance of the granules as indicators of their stability and value of 0.6 as threshold level for stable granulation.

Subject Keywords

COD/N Ratio, Extracellular Polymeric Substance, Granulation, Nitrification, SBR, Simultaneous Denitrificationa

URI

https://hdl.handle.net/11511/42202

Journal

ECOLOGICAL ENGINEERING

DOI

https://doi.org/10.1016/j.ecoleng.2016.01.077

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

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 effects of aerobic/anoxic period sequence on aerobic granulation and COD/N treatment efficiency Erşan, Yusuf Çağatay; Bayramoğlu, Tuba Hande (Elsevier BV, 2013-11) 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 we...
Direct Methane Oxidation to Methanol by N2O on Fe- and Co-ZSM-5 Clusters with and without Water: A Density Functional Theory Study Fellah, Mehmet Ferdi; Önal, Işık (2010-02-25) Density functional theory (DFT) calculations were carried Out ill a Study of oxidation of methane to methanol by N2O on the Fe- and Co-ZSM-5 clusters. The catalytic cycle steps have been Studied oil model Clusters ((SiH3)(4)AlO4M) (where M = Fe, Co). Calculations indicate very low methanol selectivity Without water and increasing rate of methanol formation with water. These results are in qualitative agreement with the experimental literature. The methanol formation step is also found to be the rate-limitin...
Inferential control of boric acid production system Dervişoğlu, Özgecan; Özgen, Canan; Department of Chemical Engineering (2007) Inferential control of boric acid production system using the reaction of colemanite with sulfuric acid in four continuously stirred tank reactors (CSTR) connected in series is aimed. In this control scheme, pH of the product is measured on-line instead of boric acid concentration for control purposes. An empirical correlation between pH and boric acid concentration is developed using the collected data in a batch reacting system in laboratory-scale and this correlation is utilized in the control system for...
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

I. KOCATURK and T. H. Bayramoğlu, “Influent COD/TAN ratio affects the carbon and nitrogen removal efficiency and stability of aerobic granules,” ECOLOGICAL ENGINEERING, pp. 12–24, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42202.