Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 6, Issue 4, Pages 5481-5487Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2018.07.053
Keywords
Hydrothermal carbonization; Process water; Recirculation; Green waste
Categories
Funding
- German Federal Ministry of Education and Research (BMBF) via the Excellence Cluster BioEconomy [FKZ: 031A445A]
Ask authors/readers for more resources
Hydrothermal carbonization (HTC) is a promising conversion technology for wet biogenic waste material. However, after HTC the process water (PW) is highly enriched with organics. By reutilization of PW, the amount of contaminated waste water can be strongly reduced. However, temperature influence on hydrochar and PW composition during PW recirculation was not examined yet. Therefore, municipal green waste (MGW) was hydrothermally treated at 180 and 220 degrees C. The PW after HTC was fully reused up to 11 times. Results showed that hydrochar mass yield increases with progressing PW recirculation. Higher temperatures strengthen this effect. However, the higher heating value was not affected by recirculation process. PW analysis showed an accumulation of total organic carbon (TOC), chemical oxygen demand (COD), and organic acids. Most enriched and detected acids are acetic, formic, lactic and propionic acid. Only for formic acid, higher temperatures reduced the accumulation potential. The proportion of detected organic acids on TOC increased and could indicate a degradation of complex organic compounds. Detected phenols accumulated and increased by the factor of 5 at 220 degrees C. Finally, accumulation kinetics were calculated and showed in good approximation a first order behavior. Over all HTC recirculation steps, no PW had to be disposed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available