Abstract
Biological wastewater treatment using algae–bacteria consortia for nutrient uptake and resource recovery is a ‘paradigm shift’ from the mainstream wastewater treatment process to mitigate pollution and promote circular economy. The symbiotic relationship between algae and bacteria is complex in open or closed biological wastewater treatment systems. In this regard, machine learning algorithms (MLAs) have found to be advantageous to predict the uncertain performances of the treatment processes. MLAs have shown satisfactory results for effective real-time monitoring, optimization, prediction of uncertainties and fault detection of complex environmental systems. By incorporating these algorithms with online sensors, the transient operating conditions during the treatment process including disruptions or failures due to leaking pipelines, malfunctioning of bioreactors, unexpected fluctuations of organic loadings, flow rate, and temperature can be forecasted efficiently. This paper reviews the state-of-the-art MLA approaches for the integrated operation of biological wastewater treatment systems combining algal biomass production and nutrient recovery from municipal wastewater.
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Abbreviations
- \(NH_{4}^{ + }\) :
-
Ammonium
- \(NO_{3}^{ - }\) :
-
Nitrate
- ANN:
-
Artificial neural network
- ARMA:
-
Auto-regressive moving average model
- BOD:
-
Biochemical oxygen demand
- CNN:
-
Convolutional neural network
- COD:
-
Chemical oxygen demand
- DO:
-
Dissolved oxygen
- FNN:
-
Fuzzy neural network
- FWSF:
-
Free water surface flow
- GPR:
-
Gaussian progress regression
- HRT:
-
Hydraulic retention time
- HSSF:
-
Horizontal subsurface flow
- ML:
-
Machine learning
- MLA:
-
Machine learning algorithm
- MLP:
-
Multilayer perceptron
- MLSS:
-
Mixed liquor suspended solids
- NH3 :
-
Ammonia
- OLR:
-
Organic loading rate
- PCA:
-
Principal component analysis
- QTA:
-
Qualitative trend analysis
- R 2 :
-
Correlation coefficient
- RL:
-
Reinforcement learning
- RMSE:
-
Root-mean-squared error
- SCADA:
-
Supervisory control and data acquisition
- SVM:
-
Support vector machine
- TDS:
-
Total dissolved solids
- TN:
-
Total nitrogen
- TP:
-
Total phosphorus
- TSS:
-
Total suspended solids
- WWTP:
-
Wastewater treatment plant
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Acknowledgements
The authors thank Asian Institute of Technology, Thailand, for providing an opportunity to collaborate and work on this review paper. O.A. Ramírez Calderón, O.M. Abdeldayem and J. Lazaro Gil thank the Erasmus+ International Master of Science in Environmental Technology and Engineering (IMETE) for supporting their M.Sc study at UCT Prague (Czech Republic), IHE Delft (The Netherlands), and Ghent University (Belgium). E.R. Rene thanks IHE Delft for providing staff time support under the project “Support to Society” to co-work with researchers from Taiwan, Mongolia and students of the ERASMUS+ IMETE programme.
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Sundui, B., Ramirez Calderon, O.A., Abdeldayem, O.M. et al. Applications of machine learning algorithms for biological wastewater treatment: Updates and perspectives. Clean Techn Environ Policy 23, 127–143 (2021). https://doi.org/10.1007/s10098-020-01993-x
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DOI: https://doi.org/10.1007/s10098-020-01993-x