Start-up of a full-scale deammonification SBR-treating effluent from digested sludge dewatering.
This study shows the start-up and operation of a full-scale sequencing batch reactor (SBR) with a volume of 550 m³ for deammonification of reject water from sludge dewatering over the first 650 days of operation. The SBR was operated with discontinuous aeration and achieved an optimum of around 85% of ammonium removal at a load of 0.17 kg m⁻³ d⁻¹. The application of batch tests for the activity measurement of aerobic ammonium and nitrite oxidizing bacteria and anaerobic ammonium oxidizing bacteria were proven to support the identification of setbacks in reactor operation. Furthermore, the calculation of the oxygen uptake rates from online oxygen measurements helped to explain the overall reactor performance. The aeration regime is a key parameter for stable operation of such an SBR for deammonification. At aeration/non-aeration time ranges from 6-9 min, the best results with respect to turnover rates and low nitrate production were achieved. Compared with the nitrification/denitrification SBR operated in parallel with methanol as the carbon source, a significant reduction in costs for energy and chemicals was achieved. The costs for maintenance slightly increased.
Water Chemistry and Water Technology, Engler-Bunte Institute Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany E-mail: susanne.lackner@kit.edu.
Susanne
S
Lackner
Zweckverband Zentralkläranlage Ingolstadt, Am Mailinger Moos 145, D-85055 Ingolstadt, Germany.
Konrad
K
Thoma
Water Chemistry and Water Technology, Engler-Bunte Institute Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany E-mail: susanne.lackner@kit.edu.
Eva M
EM
Gilbert
Zweckverband Zentralkläranlage Ingolstadt, Am Mailinger Moos 145, D-85055 Ingolstadt, Germany.
Wolfgang
W
Gander
Dr.-Ing. Schreff, Ingenieurbüro für Wasser, Abwasser und Energie, Am Buchhölzl 11, D-83737 Irschenberg, Germany.
Dieter
D
Schreff
Water Chemistry and Water Technology, Engler-Bunte Institute Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany E-mail: susanne.lackner@kit.edu.
Harald
H
Horn
D064751:Ammonium Compounds; D000693:Anaerobiosis; D001419:Bacteria / Q000145:classification / Q000378:metabolism; D019149:Bioreactors; D058440:Denitrification; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors
D064751:Ammonium Compounds; D009573:Nitrites; D012722:Sewage