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A field study of lignite as a drying aid in the superheated steam drying of anaerobically digested sludge

Hoadley, A.F.A., Qi, Y., Nguyen, T., Hapgood, K., Desai, D. and Pinches, D. 2015, A field study of lignite as a drying aid in the superheated steam drying of anaerobically digested sludge, Water research, vol. 82, pp. 58-65, doi: 10.1016/j.watres.2015.04.021.

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Title A field study of lignite as a drying aid in the superheated steam drying of anaerobically digested sludge
Author(s) Hoadley, A.F.A.
Qi, Y.
Nguyen, T.
Hapgood, K.
Desai, D.
Pinches, D.
Journal name Water research
Volume number 82
Start page 58
End page 65
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-10-01
ISSN 0043-1354
1879-2448
Keyword(s) Agglomeration
Biosolids
Rotary drum drying
Spontaneous combustion
Sterilization
Coal
Desiccation
Escherichia coli
Incineration
Salmonella
Sewage
Steam
Summary Dried sludge is preferred when the sludge is either to be incinerated or used as a soil amendment. This paper focuses on superheated steam drying which has many benefits, because the system is totally enclosed, thereby minimising odours and particulate emissions. This work reports on field trials at a wastewater treatment plant where anaerobically digested sludge is dried immediately after being dewatered by belt press. The trials showed that unlike previous off-site tests, the sludge could be dried without the addition of a filter aid at a low production rate. However, the trials also confirmed that the addition of the lignite (brown coal) into the anaerobically digested sludge led to a more productive drying process, improved product quality and a greater fraction of the product being in the desired product size range. It is concluded that these results were achieved because the lignite helped to control the granule size in the dryer. Furthermore neither Salmonella spp or E coli were detected in the dried samples. Tests on spontaneous combustion show that this risk is increased in proportion to the amount of lignite used as a drying aid.
Language eng
DOI 10.1016/j.watres.2015.04.021
Field of Research 090409 Wastewater Treatment Processes
MD Multidisciplinary
Socio Economic Objective 0 Not Applicable
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Crown Copyright
Persistent URL http://hdl.handle.net/10536/DRO/DU:30092340

Document type: Journal Article
Collection: School of Engineering
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