Acid Pit Stabilization Project (Volume 1 - Cold Testing) and (Volume 2 - Hot Testing)

Abstract

During the summer of Fiscal Year 1997, a Comprehensive Environmental Response, Compensation, and Liability Act Treatability Study was performed at the Idaho National Engineering and Environmental Laboratory. The study involved subsurface stabilization of a mixed waste contaminated soil site called the Acid Pit using jet grouting of an innovative grouting material to form a monolith out of the contamination zone. The monolith simultaneously provides a barrier to further contaminant migration and closes voids in the soil structure against fi.uther subsidence. The grout used for this study was TECT-HG, a relatively dense iron oxide-based cementitious grout. The treatability study involved both cold testing in simulated soil pits followed by in situ stabilization of the Acid Pit at the INEEL's Waste Area Group 7 Subsurface Disposal Area. This report (volume 1) discusses the results of the cold testing phase of this project, and Volume 2 gives the results of the Acid Pit stabilization. Cold testing included field trials in which single and multiple connected columns were created by the jet-grouting action. In addition, several different simulated soil pits were grouted using tracer material to simulate actual contaminants that exist in the Acid Pit. Drilling equipment was specially rigged to reduce the spread of contamination, and all grouting was performed under a concrete thrust block with void space to absorb any grout returns. Data included evaluation of the grouting parameters of drill rotation rate, time at a step, grout injection pressure, grout material parameters such as vismsity, and step size. In addition, the spread of the tracer material (molybdenum powder) as a stand-in for the actual main contaminant (mercury) in the Acid Pit during grouting was evaluated by taking both air samples and surface smears. Other implementability data included thrust block reusability, grout column development and connectivenem, and grout/soil mixing.

Simulation Analysis on Sucking Process Outflow Phenomenon in Piezoelectric Pump

“…In circulation, sustaining unidirectional flow occurs [1,2] . That means the change of cubage is the reason of outflow, and the flow rate is the sum of cubage change in the unit time [3,4,5,6] . But the author finds out that besides bulk flow caused by the change of cubage during the working period of piezoelectric pump, there is also flow inertia caused by flow inertia.…”

Inertial Flow Phenomenon Analysis on Piezoelectric Pump

“…In this repetition, the unidirectivity flow occurs [1,2]. In the same time, it's taken for that there exists favorable linear relationship between drive voltage and the distortion of the vibrator [3], if the drive voltage is changed, the chamber volume is also changed, in this way, the precise control of liquid is achieved [4,5,6]. But in this paper, it comes out that not only volume change can cause the liquid flow out of the pump, but inertial flow formed by flow inertia.…”