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Biological recovery of phosphorus from waste activated sludge via alkaline fermentation and struvite biomineralization by Brevibacterium antiquum

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Abstract

Struvite biomineralization is a promising method for phosphorus recovery from wastewater treatment plant streams, and the growth of responsible microorganisms in mixed cultures is one of the most critical points for applying this process in pilot and full-scale. This study aimed to investigate the growth and bio-struvite production of Brevibacterium antiquum in mixed sludge culture. Alkaline fermentation was applied at different pH conditions to enhance the phosphorus content of sludge for an efficient recovery, and pH 8 was determined as the most feasible considering the phosphorus release and sludge characteristics. Growth optimization studies showed that NaCl's presence decreases the growth rate of Brevibacterium antiquum and bio-struvite production. At the same time, pH in the range of 6.8–8.2 did not alter the growth significantly. In addition, studies showed the ability of Brevibacterium antiquum in unsterilized fermented sludge centrate to grow and recover the phosphorus as struvite. Thus, our results indicated the potential of struvite biomineralization in full-scale wastewater treatment plants.

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Data availability

Data will be available on request: sevil.cn@gmail.com.

Abbreviations

TP:

Total phosphorus

COD:

Chemical oxygen demand

MLVSS:

Mixed liquor volatile suspended solids

MLSS:

Mixed liquor suspended solids

VFA:

Volatile fatty acid

OD:

Optical density

FT-IR:

Fourier-transform infrared spectroscopy

SEM–EDS:

Scanning electron microscopy with energy dispersive spectroscopy

AP:

Apatite phosphorus

NAIP:

Non-apatite inorganic phosphorus

AHP:

Acid-hydrolyzable phosphorus

Org-P:

Organic

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Acknowledgements

The authors thank Ataköy Biological Wastewater Treatment Plant, which provided sludge samples during the study; thank Prof. Berna Sarıyar Akbulut, Tuğba Sarı, Fatma Ece Altınışık Kaya and Eldin Kurpejovic for their scientific contributions, and the Scientific and Technological Research Council of Turkey (Project No: 118Y532) for funding the study.

Funding

This research was supported by the Scientific and Technological Research Council of Turkey (Project Number: 118Y532).

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Correspondence to Sevil Coşgun.

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Coşgun, S., Kara, B., Kunt, B. et al. Biological recovery of phosphorus from waste activated sludge via alkaline fermentation and struvite biomineralization by Brevibacterium antiquum. Biodegradation 33, 195–206 (2022). https://doi.org/10.1007/s10532-022-09975-0

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  • DOI: https://doi.org/10.1007/s10532-022-09975-0

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