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

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Sludge Analysis

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 Application Note

Download the complete Application Note: Sludge Analysis using prepASH TGA

prepASH Thermogravimetric Analyser | TGA

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