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Advanced techniques to remove phosphates and nitrates from waters: a review

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Abstract

At high levels, phosphates and nitrates from mineral fertilizers and wastewaters are contaminating natural waters, leading, for example, to eutrophication and death of many living species. This requires remediation techniques such as physical, chemical, biological methods, and nano-techniques. For instance, microbes such as Bacillus subtilis, Pseudomonas, Achromobacter, Spirulina platensis and Chlorella vulgaris allow denitrification and can remove 55% of phosphates. Removal can be done also using adsorbents produced from wastes and bio-sorbents. Here we compare the methods to remove phosphates and nitrates in waters.

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Abbreviations

A/O:

Anaerobic–oxic

BOD:

Biological oxygen demand

BPC:

Bamboo powder charcoal

CAC:

Commercial activated carbon

COD:

Chemical oxygen demand

CNTs:

Carbon nanotubes

EASC:

Extended anaerobic sludge contact process

EBPR:

Biological phosphate removal

ED:

Electrodialysis

EU:

European Union

GAC:

Granular activated carbon

NZVI:

Nanoscale zero valent iron

OM:

Organic matter

PAC:

Powdered activated carbon

PEG:

Polyethylene glycol

PHB:

Polyhydroxybutyrate

PVA:

Polyvinyl alcohol

UCT:

University of Cape Town

USEPA:

United States Environmental Protection Agency

WHO:

World Health Organization

WWTPs:

Wastewater treatment plant

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Correspondence to Ponnusamy Senthil Kumar.

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Velusamy, K., Periyasamy, S., Kumar, P.S. et al. Advanced techniques to remove phosphates and nitrates from waters: a review. Environ Chem Lett 19, 3165–3180 (2021). https://doi.org/10.1007/s10311-021-01239-2

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  • DOI: https://doi.org/10.1007/s10311-021-01239-2

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