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Membrane distillation as a second stage treatment of hydrothermal liquefaction wastewater after ultrafiltration

Sayegh, Ali ORCID iD icon; Shylaja Prakash, Nikhil; Horn, Harald; Saravia, Florencia

Abstract:

The aim of this study is the utilization of membrane distillation (MD) in the treatment of hydrothermal liquefaction wastewater (HTL-WW) to recover ammonium in the condensate. Experiments were carried out using MD under air–gap configuration with HTL-WW pretreated via Ultrafiltration. The results showed membrane stability in long-term operations, up to 36 days and through a wide range of feed temperatures, from 30 °C to 60 °C (Coolant temperature was kept at 20 °C). Feed temperatures, 50 °C and 60 °C provided the best condensate quality, defined by high ammonium concentrations, up to 12 g/L (for 60 °C feed temperature), and low impurity (low contamination by TOC) based on the highest NH4+:TOC ratio of 13 (for 50 °C feed temperature). Furthermore, since flux experienced an exponential growth with the increase of feed temperature, 60 °C was chosen as the optimal temperature to expand the study on membrane/condensate recovery, which was performed until 80%. From observational and several analytical methods, wetting was unavoidable above 60% recovery and the cause was credited to organic fouling, mainly via surfactants’ adsorption on the membrane surface. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000142653
Veröffentlicht am 03.02.2022
Originalveröffentlichung
DOI: 10.1016/j.seppur.2021.120379
Scopus
Zitationen: 16
Web of Science
Zitationen: 14
Dimensions
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1383-5866, 1873-3794
KITopen-ID: 1000142653
Erschienen in Separation and Purification Technology
Verlag Elsevier
Band 285
Seiten Art.-Nr.: 120379
Nachgewiesen in Dimensions
Web of Science
Scopus
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