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EC number: 230-528-9
CAS number: 7173-62-8
A waste water treatment simulation test was performed with Amines, N-C16-18-alkyl (evennumbered) propane-1,3-diamine (133779-11-0). 99.4% removal was observed using specific chemical analyses (LCMS/MS) of the effluent during day 56 to 60 (n=5). Besides to that the sorption to sludge was measured and this accounted for 4.1% of the total removal which means that 95.3% is removed by biodegradation. Based on the readily biodegradability of all diamines (C10-18) and the fact that the simulation test has been performed with the diamine with the lowest bioavailability, it is considered justified to use the same results for the other more bioavailable diamines as for these a higher total removal and lower removal via sorption are anticipated.
The removal of Amines, N-C16-18-alkyl
(evennumbered) propane-1,3-diamine was simulated in a continuous
activated sludge (CAS) unit (Akzo Nobel, 2008b + 2008c; Dr U. Noack
Laboratoriën, 2008). One unit was fed with domestic wastewater spiked
with 50 mg/L of Amines, N-C16-18-alkyl (evennumbered)
propane-1,3-diamine, the control unit was fed with domestic wastewater
only. The aeration vessel had a capacity of 0.36 L, the flow rate was
1.1 L/day (i.e. the hydrolic retention time was 6 hours). The sludge
concentration ranged from 2.4 to 3.1 g dw/L, The sludge retention time
was 10 days. The units were maintained at 20 to 22°C. The test units
were preconditioned for one week after which sludge wasting was started.
After introduction of the test substance at day 0, removal of Amines,
N-C16-18-alkyl (evennumbered) propane-1,3-diamine was monitored by non
purgeable organic carbon (NPOC) analyses. Amines, N-C16-18-alkyl
(evennumbered) propane-1,3-diamine was readily adsorbed by the sludge
particles which lead to an immediate removal of approximately 100%.
During the last week of the test, 5
LC/MS measurements of the test substance were conducted and 99.4%
removal of Amines, N-C16-18-alkyl (evennumbered) propane-1,3-diamine was
observed. The removal determined in CAS tests is equal to the sum of
degradation and adsorption onto sludge.
To assess the contribution of each
removal process the removal due to sorption was quantified by taking
test samples from the sludge on two days during the last week and
subjecting them to chemical analysis. Al specific chemical analyses were
performed using methods developed and validated according to
SANCO/3029/99 rev.4 (11/07/00). Based on these measurements it is
concluded than only 4.1% (3.4 – 4.7) of Amines, N-C16-18-alkyl
(evennumbered) propane-1,3-diamine is removed by adsorption onto the
sludge. The results demonstrate that Amines, N-C16-18-alkyl
(evennumbered) propane-1,3-diamine is primarily removed by
biodegradation (mineralization). In conclusion, the CAS test
demonstrates that Amines, N-C16-18-alkyl (evennumbered)
propane-1,3-diamine will be biodegraded almost completely in a
conventional biological wastewater treatment plant.
These results as observed for Amines,
N-C16-18-alkyl (evennumbered) propane-1,3-diamine
mines, N-C16-18-alkyl (evennumbered)
propane-1,3-diamine also for other members of the diamines category.
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