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

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 m3 d−1 and a s...

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Bibliographic Details
Published in:Energies (Basel) 2023-01, Vol.16 (1), p.203
Main Author: Biedka, Paweł
Format: Article
Language:English
Subjects:
Aerobic digestion
Ammonium
ATAD
autothermal thermophilic aerobic digestion
Biochemical oxygen demand
Biodegradability
Biodegradation
biodegradation kinetics
Catalytic oxidation
Chemical oxygen demand
Dewatering
Effluents
Kinetics
Linear equations
Medical wastes
Municipal wastewater
Nitrogen
Organic matter
Pathogens
Phosphorus
Reactors
rejected water
Sewage disposal
Sewage treatment plants
Sludge
Sludge drying
Temperature
Wastewater facilities
Wastewater treatment
Wastewater treatment plants
Water analysis
Water sampling
Water treatment
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Summary: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 m3 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 (BOD5) ranged from 205 to 730 mg O2 L−1, while chemical oxygen demand (COD) ranged from 767 to 4884 mg O2 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 R2 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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16010203