1. atATAD Heat Recycle in Countercurrent Flow, Continuous Phase Sludge Treatment Process to Class A Fertilizer Utilizing Surface Aeration Technologies Open Access Author: Johnson, Sarah J Title: atATAD Heat Recycle in Countercurrent Flow, Continuous Phase Sludge Treatment Process to Class A Fertilizer Utilizing Surface Aeration Technologies Graduate Program: Chemical Engineering Keywords: ATADatatadwastewater treatmentcountercurrentprocess controlwwtpaerobic digestionautothermalheatenthalpymassenergy balanceequilibriumsurface aerator File: Download Thesis_Sarah_Jean_Final_13April.pdf Committee Members: Wayne Roger Curtis, Thesis Advisor/Co-Advisor