Is Time-Temperature Really Important?

Biological & Agricultural Engineering Dept.

Denver, Colorado

INTRODUCTION

Class A Lime Stabilization is quickly gaining popularity as one of the more cost-effective methods for complying with the 503-Class A Requirements. There are many facilities in operation, with more coming on-line, that operate in an open pile mode of operation. These plants typically utilize a very simple operation that consists of a sludge/lime mixer that discharges into an open pile. Sufficient quicklime is added to raise the temperature of the product to 70° C / 158° F. This product is then discharged into an open pile or a truck where it cools rapidly due to ambient conditions, during cold winter months heat loss may be rapid.