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Alkaline dehydration of source -separated fresh human urine: Preliminary insights into using different dehydration temperature and media

Simha, Prithvi and Lalander, Cecilia and Nordin, Annika and Vinnerås, Björn (2020). Alkaline dehydration of source -separated fresh human urine: Preliminary insights into using different dehydration temperature and media. Science of the Total Environment. 733 , 139313 , 1-10
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Abstract

For sanitation systems aiming at recycling nutrients, separately collecting urine at source is desirable as urine contains most of the nutrients in wastewater. However, reducing the volume of the collected urine and recovering majority of its nutrients is necessary, as this improves the transportability and the end-application of urine-based fertilisers. In this study, we present an innovative method, alkaline dehydration, for treating fresh human urine into a nutrient-rich dry solid. Our aim was to investigate whether fresh urine (pH<7) added to five different alkaline media (pH>11) could be dehydrated at elevated temperatures (50 and 60 °C) with minimal loss of urea, urine's principal nitrogen compound. We found that it was possible to concentrate urine 48 times, yielding dry end-products with high fertiliser value: approximately, 10% N, 1% P, and 4% K. We monitored the physico-chemical properties and the composition of various dehydration media to provide useful insights into their suitability for dehydrating urine. We demonstrated that it is possible to recover >90% nitrogen when treating fresh urine by alkaline dehydration by inhibiting the enzymatic hydrolysis of urea at elevated pH and minimisingthe chemical hydrolysis of urea with high urine dehydration rates.

Authors/Creators:Simha, Prithvi and Lalander, Cecilia and Nordin, Annika and Vinnerås, Björn
Title:Alkaline dehydration of source -separated fresh human urine: Preliminary insights into using different dehydration temperature and media
Year of publishing :2020
Volume:733
Article number:139313
Number of Pages:10
Publisher:Elsevier
ISSN:0048-9697
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 208 Environmental Biotechnology > Water Treatment
Keywords:Bioeconomy, Fertiliser, Nutrient recovery, Resource-oriented sanitation, Urine dehydration, Wastewater treatment
URN:NBN:urn:nbn:se:slu:epsilon-p-106786
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-106786
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2020.139313
Web of Science (WoS)000540271100030
ID Code:17293
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:20 Aug 2020 07:59
Metadata Last Modified:20 Aug 2020 07:59

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