LAPSE:2023.5340
Published Article
LAPSE:2023.5340
Model-Based Evaluation of Hydrothermal Treatment for the Energy Efficient Dewatering and Drying of Sewage Sludge
Philipp Knötig, Hendrik Etzold, Benjamin Wirth
February 23, 2023
This research paper evaluates hydrothermal carbonization (HTC) as a possible treatment for sewage sludge, including phosphorus recycling. German governmental requirements force a high number of wastewater treatment plants (WWTP) to recover phosphorus from sewage sludge above limits of 20 g kgTS−1 before further disposal (e.g., co-incineration). The results show that pH reduction has a positive effect on shifting phosphorus to the liquid phase during HTC. Although the experimental results of this research do not yet achieve the necessary phosphorus reduction, various calculations are made to achieve this goal in future experimental studies. In order to be able to assess the energy benefits of HTC, Aspen Plus modeling was used to show the positive impact of implementing this technology in a WWTP. It is shown that the mechanical dewaterability of sewage sludge (SS) increases after HTC enabling energy savings by means of subsequent thermal drying. A heat optimized HTC is able to cut energy expenses by half, further providing a phosphorus-depleted hydrochar for extensive energetic use.
Keywords
Aspen Plus, Box–Behnken design, dewatering, DoE, energetic optimization, hydrothermal treatment, phosphorus, process development, sewage sludge
Suggested Citation
Knötig P, Etzold H, Wirth B. Model-Based Evaluation of Hydrothermal Treatment for the Energy Efficient Dewatering and Drying of Sewage Sludge. (2023). LAPSE:2023.5340
Author Affiliations
Knötig P: Biorefineries Department, DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany
Etzold H: Biorefineries Department, DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany
Wirth B: Biorefineries Department, DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany
Journal Name
Processes
Volume
9
Issue
8
First Page
1346
Year
2021
Publication Date
2021-07-30
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr9081346, Publication Type: Journal Article
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LAPSE:2023.5340
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doi:10.3390/pr9081346
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Feb 23, 2023
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