The high-performance digester (HPD) demonstrated higher efficiency in the biosolids and sludge treatment, with a residence time of at least 6 days compared to conventional systems with a retention time greater than 20 days. Furthermore, the HPD requires less energy and can treat a higher daily substrate load comparing to traditional processes.
The heart of the reactor consists of glass-lined steel for standard systems or stainless steel for compact designs. The sludge flows from the bottom of the digester to the top, forming a plug flow. The reactor medium mixing occurs in two methods: an impulse pump, which ensures an overall mixing, and the perforated reactor plates, which provide an additional local mixing. An automatic discharge system at the reactor´s bottom allows a continuous operation without periodically emptying the digestion chamber for sediment removal.