Abstract
In order to prepare low nitrogen content hydrochar, Na2SO3, and NaHSO3 have been utilized respectively as an additive to remove nitrogen from sewage sludge (SS) during hydrothermal carbonization (HTC). Compared to without additives, the maximum removal efficiency of nitrogen in hydrochar can increase as high as 68.68% at 210 °C when 10% of Na2SO3 was added. Results demonstrate that Na2SO3 has a greater capability than NaHSO3 to remove nitrogen. The key role of NS during HTC of SS was the degradation of extracellular polymeric substances (EPS) to release polysaccharides to the aqueous phase and destroying proteins structure, thus inhibiting Maillard reaction to reduce nitrogen content in hydrochar. This gave a new insight to remove nitrogen during HTC via the release of polysaccharides to the aqueous phase to avoid interaction and subsequent reaction between polysaccharides and proteins. In addition, the possible removal pathways are also analyzed and proposed in this investigation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
