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Environmental fate & pathways

Monitoring data

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Administrative data

Endpoint:
monitoring data
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed with elaborate Quality Control for both sampling and chemical analysis.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Test guideline
Qualifier:
no guideline required
Deviations:
not applicable
Principles of method if other than guideline:
Sampling of activated sludge and sediment.Treatment of samples for shipment to analytical laboratory and analysis by established analytical technique (GC-MS mode SIM). Quality checks included in the samping and analysis.
GLP compliance:
no
Type of measurement:
other: concentrations of AHTN in activated sludge and sediment of a canal
Media:
other: sediment and activated sludge

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
- Name of test material: AHTN, CAS 21145-77-7
- Physical state: powder
- AHTN 98.15 % supplied by PFW
- D3- AHTN 99 % supplied by Dr Eherenstorfer

Study design

Details on sampling:
Sludge samples were taken from the following sewage treatment plants:
• The STP Wassmansdorf is located about 3 km downstream of the river Dahme in the area of Rudow ). STP Wassmansdorf has an average dry weather flow of 192.900 m3 per day and serves a population of about 1.2 million inhabitants;
• The STP Ruhleben has an average dry weather flow of 180.000 m3 per day1) and serves a population of 1.2 million inhabitants. This plant discharges to the Teltow Canal only during the summer season; during winter the discharge is directly into the river Havel in the north of Berlin;
• The STP Schönerlinde receives the major part of its water from the North-eastern part of Berlin, from the Prenzlauer Berg to Marzahn and Pankow. The plant has an average dry weather flow of 100,000 m3 per day and serves a population of circa 0.75 million inhabitants. The water is discharged into the Nordgraben and next it flows into the Tegeler See. The first series of sludge samples was taken on 18 April 2011. The second series of samples were taken on 23 May 2011.

Sediment samples were taken from the top layer of organic-rich fine-grained material (0-5 cm) on 7 sites along the Teltow Canal, up- and downstream of the sewage treatment plants. These were the same sites as sampled in the 2004 program (Blok 2005). In some cases a top layer of sandy material (5-6 cm) was on top of the cores, due to the opening of the Canal for heavier ships after 2005. The age of the layer was estimated to be deposited during 2005-2008, maybe 2009. The samples were taken on 30 May and 1 June 2011. During the sampling procedure the samples are deep frozen and they were stored frozen.

The control sample with silica gel was spiked just before the freeze/drying. After freeze-drying the samples were stored at 4 ºC before being sent to the analytical laboratory.

Results and discussion

Concentrationopen allclose all
Country:
Germany
Location:
Berlin STPs activated sludge
Substance or metabolite:
substance
Conc.:
1.2 - 1.8 mg/kg dw
Remarks on result:
other: range for two samples taken in 3 STPs each
Country:
Germany
Location:
Berlin, sediment in Teltow canal
Substance or metabolite:
substance
Remarks on result:
other: 6 out of 7 samples was < 0.1 mg/kg dw, one sample contained 0.20 mg/kg dw
Details on results:
Based on the monitoring data from 2000, 2003 and 2011, the tendency for decreasing concentrations of AHTN in activated sludge and in sediment was confirmed.

Any other information on results incl. tables

Concentrations and % organic carobn on sludge samples if the STPs in Berlin (18 April 2011)

STP

AHTN, mg/kg dw

% OC

Ruhleben

1.6

39.0

Schönerlinde

1.6

38.0

Wassmansdorf

1.8

46.0

Concentrations and % organic carobn on sludge samples if the STPs in Berlin (23 May 2011)

STP

AHTN, mg/kg dw

% OC

Ruhleben

1.5

44.0

Schönerlinde

1.2

35.0

Wassmansdorf

1.8

47.0

Concentrations and % OC in sediment samples of the Teltow Canal and in the Griebnitzsee, Berlin, taken on 31 May/ 1 June 2011

Sample ID

Distance from outlet STP

% OC

AHTN, mg/kg dw

T7

0.1 km upstream

1.6 %

<0.1

T6

0.5 km downstream

6.8 %

0.20

T5

1.0 km downstream

2.5 %

<0.1

T4

1.5 km downstream

2.4 %

<0.1

T3

1 km downstream outlet STP Ruhleben

1.3 %

<0.1

T2

1 km downstream outlet STP Stahnsdorf

0.38 %

<0.1

T1

Griebnitzsee, near entrance to river Havel

6.9 %

<0.1

Applicant's summary and conclusion

Conclusions:
The concentraions of AHTN in activated sludge samples taken in 2011 in sewage treatment plants in Berlin were below those in samples in 2004 and in 2000. They ranges from 1.8 and 2.6 mg/kg dw. In the sediment of the Teltow Canal, which is to be considered as a 'worst case', AHTN was detected in ohnly one of the 7 samples. The decreasing trend of the concentraions that was already observed in 2004, was confirmed once more.
Executive summary:

In 2011, the concentrations of some fragrance ingredients including AHTN were measured in sewage treatment plants (STPs) in Berlin, Germany, at two points in time and in sediment cores of the Teltow Canal in Berlin.

The sludge samples were taken in the STPs in Ruhleben, Schönerlinde and Wassmannsdorf. Samples were taken from the activated sludge tank according to a well-described protocol and freeze dried for transport to the analytical laboratory. A series of controls and checks was included to ensure the quality of the analyses.

The Telow Canal in Berlin receives the treated sewage water of the metropolis almost without any dilution. Practically the canal acts as a settling area for residual sludge particles that are discharged by the various sewage treatment plants in Berlin, and thus the canal may be considered as an example of a ‘realistic worst case’ with respect to the load of fragrance ingredients. Samples were taken of the top layer of organic-rich fine-grained material (0-5 cm) on 7 sites along the, up- and downstream of the sewage treatment plants.

 

The results are summarized in the table. For comparison also the results of earlier campaigns are included here.

 

Monitoring results over the years (concentrations in mg/kg dw1))

 

Sludge

Sludge

Sludge

Sludge

Sediment

Sediment

 

18 April 2011

30 May/
1 June 2011

2004

2000

23 May 2011

Dec. 2003

AHTN

1.6 – 1.8

1.2 – 1.8

1.8 – 2.6

3.6

0.20

1/7 > r.l. 2)

0.22 – 0.46

4/7 > r.l.

1)not standardizedfor organic carbon

2)1/7 > r.l.: 1 of 7 samples were above the reporting limit

 

For AHTN the local recovery in the sludge samples was in line with the expected recovery range (85-125%). Local recovery of AHTN in the sediment samples was 108%.

 

The highest concentration in the sediment was found 0.5 to 1.5 km downstream of the discharge point of the STP Wassmansdorf. The sediment concentrations were at or below the levels in the activated sludge of the STPs by an order of magnitude.

 

In 2000 and 2003/2004, similar monitoring activities have been carried out and the current results were compared to the earlier results. For AHTN the tendency to decrease was confirmed.

Also in sediment the concentrations clearly decreased and the number of samples with concentrations above the reporting limit was reduced from 4 out of 7 in 2004 to 1 out of 7 in 2011.