Phototrophic bacteria for nutrient recovery from domestic wastewater

Hulsen, Tim, Batstone, Damien J. and Keller, Jurg (2014) Phototrophic bacteria for nutrient recovery from domestic wastewater. Water Research, 50 18-26. doi:10.1016/j.watres.2013.10.051


Author Hulsen, Tim
Batstone, Damien J.
Keller, Jurg
Title Phototrophic bacteria for nutrient recovery from domestic wastewater
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2014-03-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.watres.2013.10.051
Volume 50
Start page 18
End page 26
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2014
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract The organics and nutrients in industrial and domestic wastewater are increasingly being regarded as a valuable resource for energy and nutrient recovery. Emerging concepts to redesign wastewater treatment as resource recovery systems include the use of different bacteria and algae to partition carbon and nutrients to the particulate phase through assimilation or bio-accumulation. This study evaluates the use of purple phototrophic bacteria (PPB) (also known as purple non-sulphur bacteria or PNSB) for such a biological concentration process through a series of batch tests. The key objectives are to (a) demonstrate consistent selection and enrichment of PPB using infrared light in a non-sterile medium, and (b) achieve effective partitioning of soluble organics, ammonium and phosphate into the PPB culture. PPB were successfully enriched from pre-settled domestic wastewater within 2-3 days and identified as members of the order Rhodobacterales. Under anaerobic conditions with infrared irradiation the enrichment culture was able to simultaneously remove COD (63±5%), NH4-N (99.6%-0.12±0.03mgNL-1) and PO4-P (88%-0.8±0.6mgPL-1) from primary settled domestic wastewater in 24h. In this experiment, acetate was added as an additional carbon source to demonstrate the maximal nitrogen and phosphorous elimination potential. Almost all the COD removed was assimilated into biomass rather than oxidised to CO2, with the total COD actually increasing during the batch experiments due to phototrophic synthesis. NH4-N and PO4-P were also assimilated by the biomass rather than removed through destructive oxidation or accumulation. The process offers the opportunity to concentrate organics and macronutrients from wastewater in one solids stream that can be anaerobically digested to generate energy and recover nutrients from the concentrated digestate. Technical challenges include the design of a continuous reactor system, as well as efficient delivery of electrons, either through light or chemical sources.
Keyword Assimilation
COD
Domestic wastewater
Nutrient recovery
Purple non-sulphur bacteria
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 31 October 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
 
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