Browse Prior Art Database

Waste-Water Treatment

IP.com Disclosure Number: IPCOM000046588D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hill, WR: AUTHOR [+4]

Abstract

A polymer/alum blend is added to water having submicron size, foreign organic material. A floccule is thus formed which can be removed by filtration. Submicron size, negatively charged, organic particles are generated by biodegradation, as waste water is treated by the use of a rotating biological contactor. This charge is neutralized by treating the water with an equal mixture of low molecular weight NALCO 8100* and alum, in an amount of about 10 to 50 milligrams per liter of waste water. As this treated water is later passed through a dual media filter, a flocculent layer builds upon the media, and the particles are filtered out of the water stream. The treatment chemicals, consisting of alum and the specified polymer, form a floc.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 88% of the total text.

Page 1 of 1

Waste-Water Treatment

A polymer/alum blend is added to water having submicron size, foreign organic material. A floccule is thus formed which can be removed by filtration. Submicron size, negatively charged, organic particles are generated by biodegradation, as waste water is treated by the use of a rotating biological contactor. This charge is neutralized by treating the water with an equal mixture of low molecular weight NALCO 8100* and alum, in an amount of about 10 to 50 milligrams per liter of waste water. As this treated water is later passed through a dual media filter, a flocculent layer builds upon the media, and the particles are filtered out of the water stream. The treatment chemicals, consisting of alum and the specified polymer, form a floc. This floc is injected into the water stream to be filtered, at a point upstream of the filter. This floc consists of an aggregation of very finely suspended particles having an electrical charge opposite and approximately equal to the undesirable charged particles carried by the water stream. This floc combines with and forms larger flocculent clusters. The flocculent clusters, along with an excess of charged floc, are lighter in density, and are sufficiently voluminous, to form a continuous film over the topmost surface of the filter. This film attracts any remaining charged particles in the water stream as the stream flows through the flocculent layer on the surface of the anthracite/sand filter. Periodic back...