TY - JOUR
T1 - Treatment of hydrothermal liquefaction wastewater with ultrafiltration and air stripping for oil and particle removal and ammonia recovery
AU - Sayegh, Ali
AU - Shylaja Prakash, Nikhil
AU - Pedersen, Thomas Helmer
AU - Horn, Harald
AU - Saravia, Florencia
N1 - Funding Information:
This project has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 818413. (NextGenRoadFuel - Sustainable Drop-In Transport fuels from Hydrothermal Liquefaction of Low Value Urban Feedstocks). The authors would like to thank Steeper Energy (https://steeperenergy.com/) for the processing of the sludge and supply of the water phase used for the study. The authors would like to thank the KIT Research Laboratories at the Engler-Bunte-Institut Water Chemistry and Water Technology, and at Institute of Catalysis and Technology Research for their experimental support, and the DVGW research center at the Engler-Bunte-Institut. Axel Heidt, Ulrich Reichert, Reinhard Sembritzki and Matthias Weber (Engler-Bunte-Institut) are acknowledged for their assistance in laboratory experiments.
Funding Information:
This project has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 818413 . (NextGenRoadFuel - Sustainable Drop-In Transport fuels from Hydrothermal Liquefaction of Low Value Urban Feedstocks).
Publisher Copyright:
© 2021
PY - 2021/12
Y1 - 2021/12
N2 - This study aims to evaluate the application of ultrafiltration technology for the separation of particles and oil droplets and the recovery of ammonia from hydrothermal liquefaction (HTL) wastewater. Real HTL wastewater from the hydrothermal liquefaction of municipal sewage sludge was used in this study. Experiments were carried out using a submerged polyethersulfone ultrafiltration membrane with molecular weight cutoff of 100 kDa in combination with air stripping and addition to acid and base traps for recovery of volatiles. Results showed, that the best operation mode of ultrafiltration is with backwash cycles of the permeate, maintaining a flux lower than the critical flux of 6 L/h·m2. The setup led to fast stripping of ammonia, which was successfully recovered by 88% in the acid trap. This application can be considered an adequate first stage treatment of the HTL wastewater. The importance of this work is that it proves that membrane technology can be successful in treating complex real HTL wastewater, and is not only limited for applications using model solutions.
AB - This study aims to evaluate the application of ultrafiltration technology for the separation of particles and oil droplets and the recovery of ammonia from hydrothermal liquefaction (HTL) wastewater. Real HTL wastewater from the hydrothermal liquefaction of municipal sewage sludge was used in this study. Experiments were carried out using a submerged polyethersulfone ultrafiltration membrane with molecular weight cutoff of 100 kDa in combination with air stripping and addition to acid and base traps for recovery of volatiles. Results showed, that the best operation mode of ultrafiltration is with backwash cycles of the permeate, maintaining a flux lower than the critical flux of 6 L/h·m2. The setup led to fast stripping of ammonia, which was successfully recovered by 88% in the acid trap. This application can be considered an adequate first stage treatment of the HTL wastewater. The importance of this work is that it proves that membrane technology can be successful in treating complex real HTL wastewater, and is not only limited for applications using model solutions.
KW - Air stripping
KW - Ammonia recovery
KW - Hydrothermal liquefaction wastewater
KW - Oil and particle removal
KW - Ultrafiltration
UR - https://www.scopus.com/pages/publications/85119085683
U2 - 10.1016/j.jwpe.2021.102427
DO - 10.1016/j.jwpe.2021.102427
M3 - Journal article
AN - SCOPUS:85119085683
SN - 2214-7144
VL - 44
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 102427
ER -