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Biodegradation Kinetics of Organic Matter in Water from Sludge Dewatering after Autothermal Thermophilic Aerobic Digestion

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  • Paweł Biedka

    (Department of Water Supply and Sewage Systems, Bialystok University of Technology, Wiejska 45A Street, 15-351 Bialystok, Poland)

Abstract

The study presents the research results on the rejected water generated in dewatering sludge stabilised in Autothermal Thermophilic Aerobic Digestion (ATAD) technology. The research was carried out in three municipal wastewater treatment plants (WWTPs), with a capacity of 1500 to 3260 m 3 d −1 and a sludge node capacity of 835 to 2000 kg DM d −1 . The mean content of Kjeldahl nitrogen (TKN) in the rejected water samples taken from each object ranged from 485 to 1573 mg N L −1 , ammonium nitrogen 318 to 736 mg N L −1 , and the average concentration of total phosphorus ranged from 96 to 281 mg P L −1 . The average content of organic matter expressed as five-day biological oxygen demand (BOD 5 ) ranged from 205 to 730 mg O 2 L −1 , while chemical oxygen demand (COD) ranged from 767 to 4884 mg O 2 L −1 . The study determined the kinetics of the biochemical decomposition of organic matter, assuming that it follows the first-order equation. The average reaction rate constant k in subsequent treatment plants was estimated at 0.424, 0.513 and 0.782 d −1 . The R 2 coefficient determining the model’s adjustment to empirical values was not lower than 0.952. The organic matter biodegradability index average values ranged from 0.17 to 0.26.

Suggested Citation

  • Paweł Biedka, 2022. "Biodegradation Kinetics of Organic Matter in Water from Sludge Dewatering after Autothermal Thermophilic Aerobic Digestion," Energies, MDPI, vol. 16(1), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:203-:d:1014221
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    References listed on IDEAS

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    1. Fytili, D. & Zabaniotou, A., 2008. "Utilization of sewage sludge in EU application of old and new methods--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(1), pages 116-140, January.
    2. Anna V. Piterina & John Bartlett & Tony J. Pembroke, 2010. "Evaluation of the Removal of Indicator Bacteria from Domestic Sludge Processed by Autothermal Thermophilic Aerobic Digestion (ATAD)," IJERPH, MDPI, vol. 7(9), pages 1-20, September.
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