Abstract
Biological processes based on aerobic and anaerobic technologies have been continuously developed to wastewater treatment and are currently routinely employed to reduce the contaminants discharge levels in the environment. However, most methodologies commonly applied for monitoring key parameters are labor intensive, time-consuming and just provide a snapshot of the process. Thus, spectroscopy applications in biological processes are, nowadays, considered a rapid and effective alternative technology for real-time monitoring though still lacking implementation in full-scale plants. In this review, the application of spectroscopic techniques to aerobic and anaerobic systems is addressed focusing on UV–Vis, infrared, and fluorescence spectroscopy. Furthermore, chemometric techniques, valuable tools to extract the relevant data, are also referred. To that effect, a detailed analysis is performed for aerobic and anaerobic systems to summarize the findings that have been obtained since 2000. Future prospects for the application of spectroscopic techniques in biological wastewater treatment processes are further discussed.

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Abbreviations
- 3D-EEM:
-
Three-dimensional excitation-emission matrix
- AD:
-
Anaerobic digestion
- AGS:
-
Aerobic granular sludge
- ALE:
-
Alginate-like exopolysaccharides
- AMPTS:
-
Automatic methane potential test system II
- AnDMBR:
-
Anaerobic dynamic membrane bioreactor
- ANN:
-
Artificial neural networks
- BA:
-
Bicarbonate alkalinity
- BMP:
-
Biochemical methane potential
- BOD5 :
-
Biochemical oxygen demand
- CA:
-
Cluster analysis
- CAS:
-
Conventional activated sludge
- CNOM:
-
Colored natural organic matter
- COD:
-
Chemical oxygen demand
- DCOD:
-
Dissolved chemical oxygen demand
- DM:
-
Dry matter
- DOC:
-
Dissolved organic carbon
- DOM:
-
Dissolved organic matter
- EBPR:
-
Enhanced biological phosphorus removal
- EDAN:
-
N-(1-naphthyl)ethylenediamine
- EDTA:
-
Ethylenediamine tetraacetic acid
- EEM:
-
Excitation-emission matrix
- EPS:
-
Extracellular polymeric substances
- Ex/Em:
-
Excitation/emission
- FIA:
-
Flow injection analysis
- FIR:
-
Far-infrared
- FLC:
-
Fluorescence
- FRI:
-
Fluorescence regional integration
- FT:
-
Fourier-transform
- FTIR:
-
Fourier-transform infrared
- FT-NIR:
-
Fourier transform near-infrared
- GC:
-
Gas chromatography
- GC-MS:
-
Gas chromatography-mass spectrometry
- GDA:
-
Generalized discriminant analysis
- H2S:
-
Hydrogen sulfide
- HS− :
-
Bisulfide ion
- IR:
-
Infrared
- KPLS:
-
Kernel partial least squares
- LC-MS:
-
Liquid chromatography-mass spectrometry
- LDA:
-
Linear discriminant analysis
- LWR:
-
Locally weighted regression
- MBR:
-
Membrane bioreactors
- MIR:
-
Mid-infrared
- ML-PLS:
-
Multi-layer partial least squares
- MLVSS:
-
Mixed liquor volatile suspended solids
- MMC:
-
Mixed microbial cultures
- MWPLS:
-
Moving window partial least squares
- NH4–N:
-
Ammonia nitrogen
- NIR:
-
Near-infrared
- NMR:
-
Nuclear magnetic resonance
- NNPCR:
-
Nonlinear principal components regression
- OLR:
-
Organic loading rate
- OM:
-
Organic matter
- PARAFAC:
-
Parallel factor analysis
- PCA:
-
Principal component analysis
- PHA:
-
Polyhydroxyacanoates
- PHB:
-
Polyhydroxybutyrates
- PLS:
-
Partial least squares
- RF:
-
Random forest
- RVM:
-
Relevance vector machines
- SBR:
-
Sequencing batch reactor
- SG:
-
Savitzky–Golay
- SVM:
-
Support vector machines
- SW-NIR:
-
Short-wave near-infrared
- SWR:
-
Step-wise regression
- TC:
-
Total carbon
- TIC:
-
Total inorganic carbon
- TKN:
-
Total Kjeldahl nitrogen
- TOC:
-
Total organic carbon
- TS:
-
Total solids
- TSS:
-
Total suspended solids
- UV–Vis:
-
Ultraviolet-visible
- VNIR:
-
Visible-near-infrared
- VSS:
-
Volatile suspended solids
- WAS:
-
Waste activated sludge
- WWT:
-
Wastewater treatment
- WWTPs:
-
Wastewater treatment plants
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Acknowledgements
The authors thank the Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UID/BIO/04469/2013 unit, COMPETE 2020 (POCI-01-0145-FEDER-006684) and the project RECI/BBB-EBI/0179/2012 (FCOMP-01-0124-FEDER-027462) and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020—Programa Operacional Regional do Norte. The authors also acknowledge the financial support to Daniela P. Mesquita and Cristina Quintelas through the postdoctoral Grants (SFRH/BPD/82558/2011 and SFRH/BPD/101338/2014) provided by FCT—Portugal.
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Mesquita, D.P., Quintelas, C., Amaral, A.L. et al. Monitoring biological wastewater treatment processes: recent advances in spectroscopy applications. Rev Environ Sci Biotechnol 16, 395–424 (2017). https://doi.org/10.1007/s11157-017-9439-9
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DOI: https://doi.org/10.1007/s11157-017-9439-9