This section covers research published during the calendar year 2018 on mixing and transport processes. The review covers mixing of anaerobic digesters, mixing of heat transfer, and environmental fate and transport.

No abstract

The primary objectives of DC Water's Biosolids Management Program are to reduce the costs of solids processing and managing biosolids from the 1.4 million cubic meter per day (370-milliongallon per day (mgd))-capacity Blue Plains Advanced Wastewater Treatment Plant (BPAWTP), and to improve DC Water's sustainability profile. Costs will be reduced by largely replacing the current Class B lime stabilization process with a new Class A anaerobic digestion process that will reduce the quantity of solids hauled to beneficial use by more than 50 percent. Class A biosolids will be achieved through the use of the Thermal Hydrolysis Process (THP) preceding digestion. DC Water will further benefit through the recovery of biogas from the digestion process to generate electric power (reduce electric power purchases from the local utility) and produce steam to support the THP. This paper expands on the development of design concepts to meet the project objectives and the incorporation of these concepts within the Request for Proposals (RFP) for Design-Build (DB) services. Specifically, unique technical features that link the THP with the anaerobic digestion process for reliable operation will be presented and explained together with important design criteria. With the growing interest in thermal hydrolysis across the United States and internationally, this paper is intended to provide insight into important design considerations that are being incorporated into the DC Water thermal hydrolysis-anaerobic digestion process.The major solids processing elements of the Biosolids Program are included in a $210 million Design-Build project called the Main Process Train (MPT). Once in operation in 2014, the MPT will be the world's largest THP-anaerobic digestion installation.

This section covers research published during the calendar year 2017 on mixing and transport processes. The review covers mixing and transport of anaerobic digesters.

THE wall-building properties of salt-water drilling muds can be improved markedly by the addition of: (I) natural gums, such as tragacanth, karaya, and ghatti; (2) seaweeds, such as Irish moss; or (3) gelatinized starch. Results of laboratory tests have been confirmed by field trials. For drilling operations in which the mud becomes contaminated by salt, either through penetrating salt-bearing rocks or by addition of sea water to the mud, the added cost resulting from the use of one of the substances listed above is more than offset by freedom from stuck drill pipe and ease in running casing.