Process for the handling of waste waters

US4486314A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Edgar Koppelmann · Hilden, DE
• Gerd Krapp · Düsseldorf, DE
• Klaus Schumann · Weil am Rhein, DE
• Heinz Smolka · Langenfeld, DE

Key dates

• Filing date: Feb 23, 1984
• Grant date: Dec 4, 1984
• Expiry date: Feb 23, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F1/5236
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Process for the treatment of sewage by using conventional precipitants and flocculants, like silicates, iron- or aluminum salts or organic polymers, and in addition about 0.1-10 (0.03-3) g/l sewage of X-ray amorphous or crystalline, finely-divided alkali- and/or alkaline earth-alumosilicates of the formula: EQU x cat.sub.2/n.Al.sub.2 O.sub.3.y SiO.sub.2 where x=0.7-1.5; y=0.8-6; cat=Na, K, Mg or Ca; n=1-2. The compounds contain preferably bound water. The alumosilicate is added preferably in the form of an aqueous suspension (pH 3.5-5.0) to the sewage to be treated, adjusted if necessary to a weakly alkaline to weakly acid pH-value (5-10). The pH-value is preferably adjusted with strong acids, preferably sulfuric acid. In sewage from laundries, which can already contain x g alumosilicates, the amount is reduced by x g. Advantage: Compared to known processes, the dirt elimination rate is greater and/or the consumption of precipitants is reduced. The separated impurities are deposited in large floccules, and the separated sludges contain less water.