The disposal of excess sludge from wastewater treatment plants is a serious problem that needs to be addressed. Temperature-phased anaerobic digestion (TPAD) which combines thermophilic and mesophilic processes in one, brings together the advantages of both systems. The aim of the present work was to develop a simple kinetic model to describe the TPAD of sewage sludge in batch completely stirre...

The fate and behaviour of two groups of endocrine disrupting chemicals, steroid estrogens and nonylphenol ethoxylates, have been evaluated during the anaerobic digestion of primary and mixed sewage sludge under mesophilic and thermophilic conditions. Digestion occurred over six retention times, in laboratory scale reactors, treating sludges collected from a sewage treatment works in the United ...

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, ammo...

Anaerobic digestion (AD) is one of the few sustainable technologies that both produce energy and treat waste streams. Driven by a complex and diverse community of microbes, AD may be affected by different factors, many of which also influence the composition and activity of the microbial community. In this study, the biodiversity of microbial populations in innovative mesophilic/thermophilic te...

The anaerobic digestion and co-digestion with waste activated sludge of liquid pressed biowaste from kerbside collection was studied both in mesophilic and thermophilic conditions. The research focused on the aspects related to a comparison between mesophilic and thermophilic conditions, also considering the processes stability during “non steady state” conditions and in specific perturbation i...

The need to reduce energy input and enhance energy recovery from wastewater is driving renewed interest in high-rate activated sludge treatment (i.e. short hydraulic and solids retention times (HRT and SRT, respectively)). This process generates short SRT activated sludge stream, which should be highly degradable. However, the evaluation of anaerobic digestion of short SRT sludge has been limit...

The pattern of biodegradation and the chemical changes occurring in the macromolecular fraction of domestic sludge during autothermal thermophilic aerobic digestion (ATAD) was monitored and characterised via solid-state (13)C-NMR CP-MAS. Major indexes such as aromaticity, hydrophobicity and alkyl/O-alkyl ratios calculated for the ATAD processed biosolids were compared by means of these values t...