Results 141 to 150 of about 229,751 (195)

Conduct and uses of jar tests

Journal - American Water Works Association, 1981
If procedures that simulate treatment plant conditions are followed, jar testing can produce important information quickly and economically, and the data are directly applicable to plant design, modification, and operation. The procedure offers greater flexibility and economy than the traditional pilot plant test for pretreatment.
Herbert E. Hudson, E.G. Wagner
exaly   +2 more sources

Experimental Analysis of Hydrodynamics in a Jar-test

Chemical Engineering Research and Design, 2005
Jar-tests are widely used in industry, in particular in water treatment, for flocculation. They are used to determine the optimal dose of coagulant required to perform flocculation. However, mixing mechanisms in a jar-test are unknown. Different types of motion coexist in the tank: the mean flow (or global circulation), the periodic fluctuations (or ...
Alain Line
exaly   +2 more sources

Critique of Jar Testing for the Design of Coagulation-Flocculation Systems

Water Quality Research Journal of Canada, 1996
Abstract The effects of clay type and concentration, jar shape, paddle shape, rapid mix time and flocculation velocity gradient on batch, bench-scale jar tests of turbidity were studied using a fractional factorial design. The two-parameter kinetic model for flocculation of Agraman, Kaufman and Bratby was used. This model provided a good
Donald R Woods
exaly   +2 more sources

Performance Testing of Jars

Proceedings of SPE/IADC Drilling Conference, 1990
ABSTRACT This paper presents results from a test programme on jars and jar accelerators. More than twenty jars in the range of 6.25" OD to 8" OD have been tested in a horizontal jarring rig built especially for this investigation. The test program comprises both single tool tests and full jarring tests where the jars are tested together ...
A. Kyllingstad, G. W. Halsey
openaire   +1 more source

Jar Testing Made Easy

Opflow, 2020
Achieve meaningful, useful, and transferable jar testing results by applying best practices learned from a recent study of 36 water treatment facilities in ...
openaire   +1 more source

Performance Testing of Jar Accelerators

Proceedings of SPE Annual Technical Conference and Exhibition, 1989
ABSTRACT This paper presents results from a test program on jars and jar accelerators. Ten different accelerators in the range of 6.25" OD to 8" OD have been tested in a horizontal jarring rig built especially for this investigation. The test program comprises both single tool tests and full jarring tests where accelerator's are tested ...
A. Kyllingstad, L. H. Slørdal
openaire   +1 more source

Jar‐test evaluations of enhanced coagulation

Journal AWWA, 1995
Utilities should begin evaluating the amenability of their water supplies to enhanced coagulation.The proposed Disinfectants/Disinfection By‐Products (D/DBP) Rule includes a requirement that surface water systems using conventional treatment must remove DBP precursors—as measured by total organic carbon (TOC)—in addition to meeting standards for the D ...
Stuart W. Krasner, Gary Amy
openaire   +1 more source

Similitude Interpretation of Jar Test Data

Journal of Environmental Engineering, 1984
A method for using a modified jar test in conjunction with a hydraulic similitude calculation was developed to predict sedimentation basin performance. The method was tested at the Mark B.
Gregory D. Reed, R. Bruce Robinson
openaire   +1 more source

Heel-Drop Jarring Test for Appendicitis

Archives of Surgery, 1985
To the Editor.—The heel-drop jarring test for appendicitis and other intraperitoneal inflammation, also known as the Markle test, was published in 1973 and, as a simple bedside test, was shown to be superior to the better-known rebound test.1A recent review of a series of 190 appendectomies confirmed this advantage and in addition, the test was found ...
openaire   +2 more sources

Velocity Gradient Calibration of Jar‐Test Equipment

Journal AWWA, 1975
During a study to determine mixing intensity, four groups of jars‐test Systems were utilized and mean velocity gradient, turbulent gross drag coefficient, and Reynolds and Power numbers were calculated. It was concluded that the same G, or mean velocity gradient, values could be produced by impellers of different shapes as long as projected areas were ...
Ruey J. Lai, H. E. Hudson, J. E. Singley
openaire   +1 more source