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.

Stability in organic solvents and identity of relevant degradation products

Link to relevant study record(s)

Reference

Endpoint:

stability in organic solvents and identity of relevant degradation products

Type of information:

experimental study

Adequacy of study:

key study

Study period:

8 March 2021 – 16 March 2021

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

no guideline required

Principles of method if other than guideline:

Small amounts of the powdered material (about 10mg) of grain size >50μm were stirred into 50ml of 10 different organic solvents at 20oC and the result was qualitatively assessed by colour change.

Test substance stable:

yes

Transformation products:

no

Organic solvents examined	Method	Colour change
1)      Acetone 2)      Alcohol 3)      Benzene 4)      Chloroform 5)      Dichloromethane 6)      N-hexane 7)      Methanol 8)      Pentane 9)      2-propanol 10)  Trichloroethane	10mg added in 50ml of solvent, stirred for 24 hours, colour change noted.	None

 

Conclusions:

The stability of the dried waste sludge in ten commonly used Organic Solvents was assessed.
The material is apparently stable in all the organic solvents examined.

Executive summary:

Dried waste sludge from a biological civic effluent treatment utility was examined to ascertain its stability in organic solvents.

 

The specific methods and results obtained are as follows:

Property	Method	Result
Stability in organic solvents	Attempt dissolution of the sample in 10 organic solvents	The sample is apparently stable in all the organic solvents tested

Description of key information

Small amounts of the powdered material (about 10mg) of grain size >50μm were stirred into 50ml of 10 different organic solvents at 20oC and the result was qualitatively assessed by colour change.

Additional information

Dried waste sludge is stable in all the commonly used Organic Solvents examined.