Standard

NS-EN ISO 11734:1998

Published
Preview

Corrigenda and amendments are bought separately.

Language
Services

Abstract

This International Standard specifies a screening method for the evaluation of the biodegradability of organic compounds at a given concentration by anaerobic microorganisms. The conditions described in this test do not necessarily correspond to the optimal conditions allowing the maximum value of biodegradation to occur, since a dilute sludge is used with a relatively high concentration of test chemical. The test allows exposure of sludge to the chemical for a period of up to 60 d, which is longer than the normal sludge retention time (25 d to 30 d) in anaerobic digesters, though digesters at industrial sites can have much longer retention times. The method applies to organic compounds with a known carbon content and wich are a) soluble in water; b) poorly soluble in water, provided that a method of exact dosing is applicable; c) not inhibitory to the test microorganisms at the concentration chosen for the test; inhibitory effects can be determined in separate tests or by an additional inhibition assay. For volatile substances a case by case decision is necessary. Some can be tested if handled with special care, for example no release of gas during the test.

Document information

  • Standard from SN
  • Published:
  • Edition: 1
  • Version: 1
  • Document type: NAT
  • ICS 13.060
  • ICS 13.060.70
  • National Committee SN/K 153

Product Relations

  • Adopted from: EN ISO 11734:1998 , 0