Sustainable operation of an anaerobic sewage sludge digester requires the effective shuttling of carbon from complex organic material to methane gas. The accumulation of intermediates and metabolic products such as volatile fatty acids and hydrogen gas not only reveal inefficiency within the digestion process, but can be detrimental to reactor operation at sufficiently high levels. Eight anaero...

Source separated toilet water (black water; BW) is an important alternative nutrient source for agriculture. However, reuse and recovery of nutrients from BW limited by the presence pollutants, such as pathogens micropollutants. In this study, fate micropollutants during thermophilic hyper-thermophilic anaerobic digestion (AD) concentrated vacuum collected assessed. A total eight pharmaceutical...

Composting is a self-heating, aerobic, bio-decomposition process of organic waste that has advantages over other disposal strategies since it reduces volume by 40-50% and kills pathogens the heat generated during thermophilic phase. This uses (food scraps, grass chipping, etc.), water, soil (for added microbes) either incorporation air turning compost (aerobic) or lack within (anaerobic). study...

Mr. Don Walter should be commended for his technical paper dealing with the real-world problems of preparing anaerobic digester feeds from a difficult raw material, municipal solid waste (MSW). The information presented in the paper is not readily available in the published litera­ ture, and will be valuable to engineers interested in MSW processing and digestion. The author discusses some of t...

VERTADTM is an auto-thermophilic aerobic digestion process, employing a subsurface vertical reactor to aerobically digest mixed primary and secondary wastewater treatment solids. High metabolic activity results in heat generation, which enables the production of Class A Biosolids at short solids retention times (SRT). Currently the Technology Assessment Program of the King County Wastewater Tre...

Recycling human waste for beneficial use has been practiced for millennia. Aerobic (thermophilic) composting of sewage sludge has been shown to reduce populations of opportunistically pathogenic bacteria and to inactivate both Ascaris eggs and culturable Escherichia coli in raw waste, but there is still a question about the fate of most fecal bacteria when raw material is composted directly. Th...

High free ammonia released during anaerobic digestion of livestock wastes is widely known to inhibit methanogenic microorganisms and result in low methane production. This was encountered during our earlier thermophilic semi-continuously fed continuously-stirred tank reactor (CSTR) treatment of piggery wastewater. This study explored chemical and biological means to mitigate ammonia inhibition ...

Anaerobic digestion of bioplastics' wastes may represent a valuable disposal strategy for these important substitutes plastics, in order to reduce their leakage into the environment and produce bioenergy form biomethane, contributing positively sustainability entire life chain. Only lab-scale data about anaerobic degradability biomethane production have been produced until now, using approaches...

The effect of zero-valent iron nanoparticles (nZVI) addition on methane production during anaerobic digestion pig slurry was assessed. Experiments were conducted using two experimental set-ups: batch and long-term continuous operation at a fixed nZVI dosage. Two different temperature ranges (mesophilic thermophilic) Biogas content monitored, the specific methanogenic activity biomass oxidation ...