Your web browser is out of date.

Update your browser for better security, speed and to get the best experience on this website.

Update your browser

Aerobic digestion

Windrow: long line of composting sludge and bulking agent

What is aerobic digestion?

Aerobic digestion is the degradation of the organic sludge solids in the presence of oxygen. The oxygen is introduced as fine bubbles of air into the reactor. The micro-organisms in the sludge convert the organic material to carbon dioxide and water, and the ammonia and amino species to nitrate.

Conventional activated sludge (CAS) process Source: Judd Water & Wastewater Consultants / YouTube

Explaining the conventional activated sludge (CAS) process

Aerobic digestion resembles the conventional activated sludge (CAS) process − a process explained in this video − but excludes a wastewater feed and employs longer solids retention times.

From our sponsors…

Latest features and blogs

Figure 4.  The positive benefits of applying biosolids to land
Feature

Sludge and circularity − a report on the 8th Conference of the UK Wastewater Network

The 8th Conference of the UK Wastewater Network focused on the circular economy - talks on resource recovery (microbial protein and coagulant), ammonia to energy conversion, biosolids to land carbon accounting, and an examination of microplastics impacts.

Read article

Explore more sludge processing content