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Sludge Analysis

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

StepTemp 1 [ºC]Temp 2 [ºC]GasGas Flow [l/min]Time [min]Auto Stop [mg/min]Manual StopResults
12010510
21051053601mg/10Residue [%]/Start (A)
310555030
45505501800.5mg/30Residue [%]/W0 (B)

Sludge analysis graph

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

GroupPos.SampleIDTare [g]Weight [g]ResultWeight [g]Calc.Time
 RReference28.153228.1532A

B

28.1539

28.1576

100.002

100.013

00:22

05:22

111212930.95295.0043A

B

0.2817

0.1374

5.629

48.764

03:35

05:56

121212930.57375.0135A

B

0.2349

0.1171

4.685

49.859

03:08

05:49

131212926.93355.0143A

B

0.1740

0.0846

3.471

48.602

03:06

05:49

141212926.94045.0372A

B

0.1819

0.0802

3.612

44.074

03:22

05:49

251213128.01513.1216A

B

0.9561

0.4737

30.629

49.547

03:50

07:35

261213129.92493.0855A

B

0.9470

0.4708

30.693

49.716

03:58

07:11

271213127.04723.1207A

B

0.9563

0.4735

30.645

49.509

03:48

07:28

281213127.23953.1226A

B

0.9559

0.4741

30.613

49.600

04:10

07:36

391213627.80155.0009A

B

0.2222

0.0614

4.443

27.611

04:19

05:41

3101213628.78985.0538A

B

0.2537

0.0715

5.019

28.186

04:06

05:41

3111213623.32925.0445A

B

0.2442

0.0683

4.841

27.951

03:59

05:41

 

Group 1:A-ResultA-Calc.B-ResultB-Calc.
Mean0.218134.349380.1048347.82468
STD0.050271.010890.027252.56205
RSTD23.0482923.2421525.993145.35717
N4444

 

Group 2:A-ResultA-Calc.B-ResultB-Calc.
Mean0.9538330.645030.4730349.59288
STD0.004550.034410.001500.08998
RSTD0.477330.112290.317990.18145
N4444

 

Group 3:A-ResultA-Calc.B-ResultB-Calc.
Mean0.240034.767900.0670727.91603
STD0.016160.294820.005160.28912
RSTD6.731606.183447.696401.03567
N3333

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prepASH Thermogravimetric Analyser | TGA

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