NDLI: Microalgae-based processes for the biodegradation of pretreated piggery wastewaters

Content Provider	Springer Nature Link
Author	González, Cristina Marciniak, Judith Villaverde, Santiago García Encina, Pedro A. Muñoz, Raúl
Copyright Year	2008
Abstract	The potential and limitations of photosynthetic oxygenation on carbon and nitrogen removal from swine slurry were investigated in batch experiments using Chlorella sorokiniana and an acclimated activated sludge as model microorganisms. While algal–bacterial systems exhibited similar performance than aerated activated sludge in tests supplied with four and eight times diluted slurry, a severe inhibition of the biodegradation process was recorded in undiluted and two times diluted wastewater. Daily pH adjustment to 7 in enclosed algal–bacterial tests at several swine slurry dilutions allowed the treatment of up to two times diluted slurries (containing up to 1,180 mg N-NH4 + l−1). The combination of high pH levels and high NH4 + concentrations was thus identified as the main inhibitory factor governing the efficiency of photosynthetically oxygenated processes treating swine slurry. Measurements of soluble total organic carbon (TOC) and volatile fatty acids (VFA) present in the slurry suggested that VFA degradation (mainly acetic and propionic acid) accounted for most of the soluble TOC removal, especially during the initial stages of the biodegradation process. On the other hand, assimilation into biomass and nitrification to NO2 − constituted the main NH4 + removal processes in enclosed algal–bacterial systems.
Starting Page	891
Ending Page	898
Page Count	8
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	80
Issue Number	5
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-08-21
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Algal–bacterial systems Ammonia inhibition Biodegradation Chlorella sorokiniana Photosynthetic oxygenation Swine slurry Microbial Genetics and Genomics Microbiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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