The ongoing paradigm shift in sewage management from pollution control to resource
recovery is an integral part of a circular economy. Efforts have traditionally concentrated on …

Biological nitrogen removal from sewage via anammox is a promising and feasible
technology to make sewage treatment energy-neutral or energy-positive. Good retention of …

This review presents the state-of-the-art sludge reduction technologies applied in both
wastewater and sludge treatment lines. They include chemical, mechanical, thermal …

Free nitrous acid (FNA), the protonated form of nitrite, has historically been an unwanted
substance in wastewater systems due to its inhibition on a wide range of microorganisms …

Hydrogen production from waste activated sludge (WAS) was widely considered and
intensively investigated as a promising technology to recover energy from wastewater …

Membrane aerated biofilm reactor (MABR) and shortcut nitrogen removal are two types of
solutions to reduce energy consumption in wastewater treatment, with the former improving …

Highlights•FNA inactivates NOB to a much larger extent than it does on AOB.•Sludge
treatment using FNA is effective in establishing the nitrite pathway.•Sludge treatment using …

Anaerobic digestion of waste activated sludge (WAS) is currently enjoying renewed interest
due to the potential for methane production. However, methane production is often limited by …

Previous work has demonstrated that pre-treatment of waste activated sludge (WAS) with
free nitrous acid (FNA ie HNO 2) enhances the biodegradability of WAS, identified by a 20 …

Alkaline condition (especially pH 10) has been demonstrated to be a promising method for
short-chain fatty acid (SCFA) production from waste activated sludge anaerobic …