Modified Form of Diatomite Filtration Equation

Section: Synthetic Waters Arid Analytical Techniquesmentioning

confidence: 99%

Constant‐Rate and Constant‐Pressure Filtration Look Similar—But Are They?

Arora¹

1978

Hydraulic and Particle Size Characteristics of Some Diatomite Filter Aids

Dillingham¹,

Baumann²

1964

Self Cite

This study presents data pertaining to the hydraulic and particle size characteristics of commercial grades of diatomite used as filter aids. To achieve this, the specific study objectives were to: evaluate the reproducibility and relative simplicity of two ASTM methods for determining the grain size of soils when those methods are used to determine the particle size distribution of diatomite filter aids; determine the particle size distribution of different lots of commercial grades of diatomite filter aids; determine K3 values of different grades and of different lots of the same grade of diatomite (K3 is a constant for a given grade of diatomite at 20°C and is inversely proportional to its coefficient of permeability); and, determine whether a relationship exists between the K3 value and particle size distribution. The determination of the permeability of diatomite filter aids in this study was confined to the evaluation of K3 coefficients in the recently developed diatomite filtration equation. The ASTM Method for Grain Size Analysis of Soils‐Designation D422‐39 (Method 1) and ASTM Tentative Method for Grain Size Analysis of Soils ‐Designation D422‐61T (Method 2) were used in this study for determining particle size distribution.

Diatomite Filters for Municipal Use: Task Group Report

1965

Diatomite filters were first used by the U.S. military during World War II. Following the war, water utilities first began using these filters for filtering potable water. In 1957, AWWA established Task Group 2710 P‐Diatomite Filtration, to determine more efficient design criteria for municipal use of diatomite filters. The objectives of the task group were to: define the areas of application of diatomite filters; define the essential characteristics of filters, filter aids, and filter installations; promote further research; and, provide a continuing record of accomplishments. This article provides the report of the AWWA Task Group 2710 P‐Diatomite Filtration.