Model-Based Evaluation of Hydrothermal Treatment for the Energy Efficient Dewatering and Drying of Sewage Sludge
| Autor: | Hendrik Etzold, Philipp Knötig, Benjamin Wirth |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
020209 energy
PH reduction chemistry.chemical_element Bioengineering 02 engineering and technology TP1-1185 010501 environmental sciences energetic optimization 01 natural sciences Hydrothermal carbonization hydrothermal treatment 0202 electrical engineering electronic engineering information engineering Chemical Engineering (miscellaneous) phosphorus QD1-999 0105 earth and related environmental sciences Waste management sewage sludge Process Chemistry and Technology Phosphorus Chemical technology Box–Behnken design Aspen Plus Dewatering process development Chemistry chemistry DoE Environmental science Sewage treatment Sludge Efficient energy use dewatering |
| Zdroj: | Processes Volume 9 Issue 8 Processes, Vol 9, Iss 1346, p 1346 (2021) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr9081346 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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