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Waste Treatment by Optimizing Choice of Coagulants

IP.com Disclosure Number: IPCOM000084449D
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

Ionically-active synthetic polymers can induce and promote coagulation and precipitation growth in the treatment of industrial waste waters.

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Waste Treatment by Optimizing Choice of Coagulants

Ionically-active synthetic polymers can induce and promote coagulation and precipitation growth in the treatment of industrial waste waters.

Available polymers are of two types, anionic types and the cationic types. The anionic types possess a multiplicity of anionic groups such as carboxylic acids, in the polymeric chains, which react toward metallic cations, or hydrogel precipitates containing net positive charges, so as to create an electrostatically bound larger group capable of settling out more rapidly. The cationic types generally contain primary, secondary, tertiary or quaternary amino groups in the polymeric chains which react toward anions such as sulfate and phosphate or hydrogel precipitates containing net negative charges, similarly resulting in larger, more manageable precipitates. Normally, one or the other is selected and used in concentrations of 0.1 - 10 ppm for coagulative purposes.

Resin types can be used in proper sequence as follows. A carefully chosen cationic resin is injected into the holding tank, or even further upstream in the process flow, in which the solutions are generally acidic, nominally at a pH of 4.5. The anionic resin is introduced into the effluent stream after calcium hydroxide had been added on the way to the settling clarifier to render a pH of 12.5. A number of advantages in this sequential approach of using both types of resins are as follows:
1. Unsatisfied electrostat...