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Water 2018, 10(4), 463; doi:10.3390/w10040463

Treatment of Source-Separated Blackwater: A Decentralized Strategy for Nutrient Recovery towards a Circular Economy

1
Faculty of Science and Technology, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, 1432 Akershus, Norway
2
Ecomotive AS, Myravegen 1, N-6060 Hareid, Norway
*
Author to whom correspondence should be addressed.
Received: 28 March 2018 / Revised: 7 April 2018 / Accepted: 8 April 2018 / Published: 11 April 2018
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Abstract

Using a filter medium for organic matter removal and nutrient recovery from blackwater treatment is a novel concept and has not been investigated sufficiently to date. This paper demonstrates a combined blackwater treatment and nutrient-recovery strategy and establishes mechanisms for a more dependable source of plant nutrients aiming at a circular economy. Source-separated blackwater from a student dormitory was used as feedstock for a sludge blanket anaerobic-baffled reactor. The effluent from the reactor, with 710 mg L−1 NH4–N and 63 mg L−1 PO4–P, was treated in a sequence of upflow and downflow filtration columns using granular activated carbon, Cocos char and polonite as filter media at a flow rate of 600 L m−2 day−1 and organic loading rate of 430 g chemical oxygen demand (COD) m−2 day−1. Filtration treatment of the anaerobic effluent with carbon adsorbents removed 80% of the residual organic matter, more than 90% of suspended solids, and turbidity while releasing more than 76% NH4–N and 85% of PO4–P in the liquid phase. The treatment train also removed total coliform bacteria and E. coli in the effluent, achieving concentrations below detection limit after the integration of ultraviolet (UV) light. These integrated technological pathways ensure simultaneous nutrient recovery as a nutrient solution, pathogen inactivation, and reduction of active organic substances. The treated nutrient-rich water can be applied as a source of value creation for various end-use options. View Full-Text
Keywords: source-separation; blackwater treatment; nutrient-recovery; on-site wastewater treatment source-separation; blackwater treatment; nutrient-recovery; on-site wastewater treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Eshetu Moges, M.; Todt, D.; Heistad, A. Treatment of Source-Separated Blackwater: A Decentralized Strategy for Nutrient Recovery towards a Circular Economy. Water 2018, 10, 463.

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