Orange County opts for temperature-phased digestion with $300m biosolids upgrade

摘要

Orange County Sanitation District in California has kicked off its largest project to date after contracting a team of Brown and Caldwell and Black & Veatch to provide design services for a $300 million temperature-phased anaerobic digestion (TPAD) facility. TPAD is a two-stage anaerobic digestion process which involves thermophilic digesters treating sewage sludge, ahead of a traditional mesophilic digestion step. There have only been around 20 TPAD installations in the US to date.