Patent ID: 8956539
Filing Date: 2015-02-17
Classification: C05F,Y02A

Abstract:
1. A method of treating biosolids produced by a biological wastewater treatment process comprising: a. providing biosolids produced in a biological wastewater treatment process where the biosolids have a dry solids content of 30% or less; b. directing the biosolids to a dryer having first and second separate conveyors; c. placing the biosolids on the first conveyor and subjecting the biosolids to a first drying phase by partially drying the biosolids during the first phase to where the dry solids content of the biosolids is approximately 50% or more; d. after the first drying phase, directing the biosolids to a blender and blending nutrients into the partially dried biosolids; and e. after the first drying phase and after blending nutrients into the biosolids, placing the biosolids onto the second conveyor and drying the biosolids in a second drying phase in the dryer to where the dry solids content of the biosolids is greater than 90%.