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

The study presents the research results on rejected water generated in dewatering sludge stabilised Autothermal Thermophilic Aerobic Digestion (ATAD) technology. was carried out three municipal wastewater treatment plants (WWTPs), with a capacity of 1500 to 3260 m3 d?1 and node 835 2000 kg DM d?1. mean content Kjeldahl nitrogen (TKN) samples taken from each object ranged 485 1573 mg N L?1, ammonium 318 736 average concentration total phosphorus 96 281 P L?1. organic matter expressed as five-day biological oxygen demand (BOD5) 205 730 O2 while chemical (COD) 767 4884 determined kinetics biochemical decomposition matter, assuming that it follows first-order equation. reaction rate constant k subsequent estimated at 0.424, 0.513 0.782 R2 coefficient determining model’s adjustment empirical values not lower than 0.952. biodegradability index 0.17 0.26.