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ASTM E 1798 Document Information:
Title
Standard Test Method for Assessing Treatability or Biodegradability, or Both, of Organic Chemicals in Porous Pots
ASTM International
Publication Date:
Mar 10, 1996
Scope:
This test method covers simulating the activated sludge sewage
treatment process and therefore gives a measure of the extent of
biodegradation or removal likely to occur during sewage
treatment.
Assessment of treatability or biodegradability, or both, of
water soluble organic compounds in the porous pot test requires
dissolved organic carbon (DOC) measurements or specific chemical
analysis.
Dissolved organic carbon (DOC) measurements, relative to the
controls, can be used to calculate the removal of the test chemical
or water soluble residues by the porous pot treatment (see 12.3).
The DOC measurements do not identify water soluble chemicals.
Specific chemical analysis, on the other hand, can be used to
identify and quantify the parent test chemical or (if standards are
available) any water soluble residues formed by the porous pot
treatment. A specific chemical analytical method must have a limit
of detection (LOD) </= 0.1 mg/L in water or </= 0.1
mg/Kg in solids.
The feature that distinguishes this test from other activated
sludge simulation tests is the retention of the activated sludge in
a porous liner, that eliminates the need for a secondary clarifier
and facilitates control of the critical parameter, the sludge
retention time (SRT).
Porous pots can be completely sealed and tests using
14C-labeled test compounds are then possible. Carbon
dioxide in the exhaust gas and bicarbonate in the effluent can be
used together to assess the extent of mineralization, and levels of
radiolabel in the sludge and in the aqueous phase may also be
determined.
By simultaneously measuring the efficiency of the pots in
removing DOC, it is also possible to determine whether the test
compound has any adverse effect on normal sewage treatment
processes.
The SI units given in parentheses are for information only.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For specific hazard statements see
Section 6.
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