Synergistic hydrothermal treatment of food waste digestate residues and incineration fly ash: dehydration performance and heavy metals safety

Abstract

The poor dewaterability of digestate residues (DR) and the toxicity of fly ash (FA) limit their processing and utilization at the recycling stage. Hydrothermal treatment is a promising technology for...

Hydrothermal Coupled Pyrolytic Treatment of Sewage Sludge and Food Waste Digestate for Heavy Metal Immobilization and Biochar Properties Enhancement

“…Food waste digestate (FD) is a solid residue obtained from the anaerobic digestion process, and its treatment is becoming an urgent environmental challenge. Approximately 17.5 million tons of FD are produced annually in China, according to the production rate of 1 ton of food waste per 200 kg of FD . The FD also has the challenge of dewatering difficulty due to its characteristics, which are similar to those of the SS.…”

“…Approximately 17.5 million tons of FD are produced annually in China, according to the production rate of 1 ton of food waste per 200 kg of FD. 21 The FD also has the challenge of dewatering difficulty due to its characteristics, which are similar to those of the SS. The prevalent treatment and disposal alternatives for DR commonly encompass fertilization, sanitary landfilling, aerobic composting, and incineration.…”