A dried sludge product resulting from the treatment process of domestic wastewater. The exact processes followed for the production of the dried sludge are: Preliminary + secondary treatment of the wastewater stream, thickening, dehydration and drying of the excess sludge.

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From Sep. 19, 2021 to Oct. 5, 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study was conducted on accordance with EC directive EC 440/2008, method A.17 "oxidizing properties (solids)"

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

Contact with:

powdered cellulose

Key result

Sample tested:

test mixture as specified

Parameter:

maximum burning rate

Result:

1.51 mm/s

The maximum rate of combustion of the 60 wt.% Barium Nitrate mixture with cellulose was
determined to be 1.51 ± 0.09 mm/sec.
The average rate of combustion of the substance mixtures is as follows:

Wt.% of substance	Time to cover 200 mm, seconds	Rate of combustion, mm/sec
5	163 ± 12	1.22 ± 0.09
10	240 ± 14	0.83 ± 0.04
20	270 ± 19	0.74 ± 0.04
30	Combustion stopped	0
40	Combustion stopped	0
50	Combustion stopped	0
60	Combustion stopped	0
70	Combustion stopped	0
80	Combustion stopped	0
90	Combustion stopped	0

Interpretation of results:

other: The sample material is not oxidizing in comparison with 60 wt.% Barium Nitrate in cellulose.

Executive summary:

Dried waste sludge from a biological civic effluent treatment utility was examined to
ascertain its Oxidizing Properties.

The examination was carried out according to the guidance in Regulation EC 440/2008

The specific methods and results obtained are as follows:

Property	Method	Result
Oxidizing Properties	Measurement of the rate of combustion of a train of powder of the substance mixed with cellulose relative to 60 wt.% Barium Nitrate with cellulose	The substance is not oxidizing relative to the combustion rate of 60 wt.% Barium Nitrate with cellulose

Description of key information

The substance was tested according to EU Method A.17 (Oxidising Properties (Solids)).

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Justification for classification or non-classification

The substance is not oxidizing relative to the combustion rate of 60 wt.% Barium Nitrate with cellulos, as indicated from experimental study which was conducted according to the guidance in Regulation EC 440/2008 and, therefore, the substance is not classified as oxidising.