Biodegradable sheet for culturing sewage denitrifiers

US5316832A · kind A · utility

Assignee

• Carl Freudenberg · DE

Inventors

• Robert Groten · Sundhoffen, FR
• Gerhard Heidecke · Bensheim, DE
• Thomas Mannsbart · Edingen-Neckarhausen, DE
• Volker Siekermann · Fürth, DE

Key dates

• Filing date: May 4, 1993
• Grant date: May 31, 1994
• Expiry date: May 4, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/681
• WIPO field: Biotechnology
• WIPO sector: Chemistry

Abstract

A biodegradable substrate in sheet form which acts as a source of carbon and hydrogen in oxygen-poor water in biological water-treatment stages. The substrate is covered with at least one layer of a population of spontaneously growing denitrifiers. The substrate is a spun-bonded non-woven fabric weighing 10 to 1500 g/m.sup.2. It has a prescribed effective area that results in an ideal rate of denitrification per clarification stage at a prescribed rate of flow per area and time. The fabric is comprised of at least 50% continuous poly-.epsilon.-caprolactone filament with a mean molecular weight of 20,000 to 70,000. The individual filaments adhere to each other at their intersections.