Process and apparatus for the chemical-mechanical treatment and purification of ground waters, surface waters and effluents

US4388195A · kind A · utility

Assignee

• Passavant-Werke Michelbacher Huette · DE

Inventors

• Gunter von Hagel · Katzenelnbogen, DE
• Norbert Berlenbach · Wiesbaden, DE
• Gerhard Werner · Weinheim, DE

Key dates

• Filing date: Jul 5, 1979
• Grant date: Jun 14, 1983
• Expiry date: Jul 5, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D21/34
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process and apparatus for the chemical-mechanical treatment and purification of ground and surface waters and effluents of various types employs adding materials for coagulation, flocculation, precipitation, sedimentation and altering the pH value. The process comprises separate process stages carried out successively as follows: (1) a first initial process stage wherein certain additives are admixed to the raw water by stirring; (2) a second initial process stage wherein contact sludge is admixed by stirring; (3) a third initial process stage wherein a flocculent aid and possibly also at least some of the other materials added in the first stage are admixed by stirring with high energy input; and alternatively (4) a fourth initial process stage for the formation of course flocs and completion of reaction of the previously added materials and formation of settleable particles and conglomerations of particles together with adsorbed and attached and occluded raw water components with moderate movement. After the initial process stages a further stage occurs wherein flocs and reaction products and raw water components are separated from the clarified water with separate removal of t…