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Application Note: Sludge Analysis with Precisa's prepASH Thermogravimetric Analyser

Moisture content is a critical criterion to determine the acceptability of treated sewage sludge.

Starting with fresh sludge, the moisture content should be around 70%-80%. Dried sludge (cake) needs less than 10% of moisture. The sludge is ashed at 550°C to determine the volatile solid.

Volatile solids are a substance that can easily transform from its solid phase to its vapor phase without going through a liquid phase - domestic waste water volatile solids are about 50% organic. For local sewage stations with only a few samples per day the XM66 would be a perfect alternative to determine the moisture content, continuing to manually ash in a muffle.

In this application note, we determine the moisture content in sewage sludge using Precisa’s prepASH Thermogravimetric Analyser. 

Method: ABWASSER_105_550.log

Step

Temp 1 [ºC]

Temp 2 [ºC]

Gas

Gas Flow [l/min]

Time [min]

Auto Stop [mg/min]

Manual Stop

Results

1

20

105

 

 

10

 

 

 

2

105

105

 

 

360

1mg/10

 

Residue [%]/Start (A)

3

105

550

 

 

30

 

 

 

4

550

550

 

 

180

0.5mg/30

 

Residue [%]/W0 (B)

Sludge Analysis - Graph

Results:                                                                                               A: Res[%]/Start         B: Res[%]/W0

Group

Pos.

Sample

ID

Tare [g]

Weight [g]

Result

Weight [g]

Calc.

Time

 

R

Reference

-

28.1532

28.1532

A

B

28.1539

28.1576

100.002

100.013

00:22

05:22

1

1

12129

-

30.9529

5.0043

A

B

0.2817

0.1374

5.629

48.764

03:35

05:56

1

2

12129

-

30.5737

5.0135

A

B

0.2349

0.1171

4.685

49.859

03:08

05:49

1

3

12129

-

26.9335

5.0143

A

B

0.1740

0.0846

3.471

48.602

03:06

05:49

1

4

12129

-

26.9404

5.0372

A

B

0.1819

0.0802

3.612

44.074

03:22

05:49

2

5

12131

-

28.0151

3.1216

A

B

0.9561

0.4737

30.629

49.547

03:50

07:35

2

6

12131

-

29.9249

3.0855

A

B

0.9470

0.4708

30.693

49.716

03:58

07:11

2

7

12131

-

27.0472

3.1207

A

B

0.9563

0.4735

30.645

49.509

03:48

07:28

2

8

12131

-

27.2395

3.1226

A

B

0.9559

0.4741

30.613

49.600

04:10

07:36

3

9

12136

-

27.8015

5.0009

A

B

0.2222

0.0614

4.443

27.611

04:19

05:41

3

10

12136

-

28.7898

5.0538

A

B

0.2537

0.0715

5.019

28.186

04:06

05:41

3

11

12136

-

23.3292

5.0445

A

B

0.2442

0.0683

4.841

27.951

03:59

05:41

 

Group 1:

A-Result

A-Calc.

B-Result

B-Calc.

Mean

0.21813

4.34938

0.10483

47.82468

STD

0.05027

1.01089

0.02725

2.56205

RSTD

23.04829

23.24215

25.99314

5.35717

N

4

4

4

4

 

Group 2:

A-Result

A-Calc.

B-Result

B-Calc.

Mean

0.95383

30.64503

0.47303

49.59288

STD

0.00455

0.03441

0.00150

0.08998

RSTD

0.47733

0.11229

0.31799

0.18145

N

4

4

4

4

 

Group 3:

A-Result

A-Calc.

B-Result

B-Calc.

Mean

0.24003

4.76790

0.06707

27.91603

STD

0.01616

0.29482

0.00516

0.28912

RSTD

6.73160

6.18344

7.69640

1.03567

N

3

3

3

3


Download the Application Note: Sludge Analysis using prepASH TGA

prepASH Thermogravimetric Analyser | TGA

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