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Waste Treatment Clarifier Blanket Formation

IP.com Disclosure Number: IPCOM000084451D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Serino, JF: AUTHOR [+3]

Abstract

Certain special problems are encountered during the start-up of waste water clarifier.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 1

Waste Treatment Clarifier Blanket Formation

Certain special problems are encountered during the start-up of waste water clarifier.

Start-up operations can be improved by the injection of soluble forms of chemicals which produce precipitates with the desired densities, thereby controlling the depth, density, and density gradient of the precipitate blanket in the clarifier.

This technique is particularly applicable in a situation where sulfate anions are present in considerable quantities and where calcium ions are present, because they are introduced in the liming step which precedes clarifier treatment. It is noted that calcium sulfate is comparatively soluble (its density is 2.96) and it is not optimum for accelerating blanket build-up on restart.

Selective sequential injection of several chemicals can produce a blanket of continuously variable density in a vertical plane. The injection of these chemicals enhances the complex action of the blanket on heavy metals, soluble species and suspended solids.

Soluble barium chloride can be injected to produce insoluble barium sulfate of nominal density 4.5, or magnesium chloride can be injected to produce a nominal density of 2.66. Likewise, aluminum sulfate can be injected to produce a hydrous form of boehmite with a nominal density of 3.01, or the other form of boehmite with a nominal density of 3 to 3.5. Ferric chloride injection produces a goethite with a nominal density of 4.28.

In this technique, the operation of...