Research Article
Development of a Generalized Statistical Model for Hexavalent Chromium Removal Using Electrocoagulation Through SVR Regression Analysis
Mohamad Salem*,
Nabil Abdelmonem,
Ehssan Nassef
Issue:
Volume 11, Issue 5, September 2023
Pages:
85-94
Received:
7 November 2023
Accepted:
27 November 2023
Published:
8 December 2023
Abstract: Hexavalent chromium Cr(VI) is a highly toxic pollutant that poses a significant threat to human health and the environment. Electrocoagulation is a promising technology for the removal of Cr(VI) from wastewater. This work reviews and evaluates statistical models developed in different studies published between 2015 and 2021 on the removal of Cr(VI) using electrocoagulation. The analysis showed that none of the models was found to be conclusive, and that they all suffer from issues such as overfitting and the inability to generalize beyond the experiment domain. These models were also highly dependent on the selection of input parameters, model selection criteria, and experimental design. An attempt to solve this problem was to utilize Machine Learning (ML) techniques to develop a more robust model that can provide generalized and accurate predictions on a broader domain. The model was developed using Support Vector Machines Regression analysis (SVR). Data compiled from previously published works were used to train and test the model using a 50:50 split ratio. The model was able to make more generalized predictions but lacked accuracy. As with all ML models, this model requires a higher volume of high-quality data to improve its accuracy. The study concluded that there is still a need for more robust statistical models that can effectively capture the complexity of the electrocoagulation process and generalize well beyond the experiment domain.
Abstract: Hexavalent chromium Cr(VI) is a highly toxic pollutant that poses a significant threat to human health and the environment. Electrocoagulation is a promising technology for the removal of Cr(VI) from wastewater. This work reviews and evaluates statistical models developed in different studies published between 2015 and 2021 on the removal of Cr(VI)...
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Research Article
Microbial Detoxification of Oilfield Produced Water Using Discontinuous Bio-Unit System
Darlington Bon Nwokoma,
Kenneth Kekpugile Dagde
Issue:
Volume 11, Issue 5, September 2023
Pages:
95-101
Received:
15 October 2023
Accepted:
31 October 2023
Published:
22 December 2023
Abstract: This work investigated the biodetoxification of oilfield produced water (OPW) using indigenous microbial consortium in discontinuous aerobic biological treatment (Bio-Unit) system. The pilot scale Bio-Unit has a single tank that is operated cyclically. The Bio-Unit performance was compared with that of an extant physical treatment unit (PTU) of a crude oil facility. The pilot scale Bio-Unit achieved higher effluent indices at optimal conditions of microbial retention time of 21 days and hydraulic retention time of 24 hours. The percentage removal of Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Total Organic Carbon (TOC), Salinity and Chemical Oxygen Demand (COD) using the Bio-Unit were 98.2%, 96.8%, 98.5%, 96.7%, 97.6%, respectively, while for the physical treatment (PTU) process were 31.5%, 55.3%, 82.2%, 37.1% and 73.8%, respectively. Comparison showed that the Bio-Unit performed better than the extant PTU. The after-treatment concentrations of TOC (83.1 mg/l), Salinity (2290.7 mg/l) and COD (152.6 mg/l) from the existing physical treatment unit (PTU) were above Nigerian DPR inland and nearshore permissible level, while the after-treatment concentrations of TOC (6.81mg/l), Salinity (120.03 mg/l), and COD (14.1 mg/l) from the pilot scale Bio-Unit were below the regulatory limits. Therefore, it is proposed that the extant PTU be upgraded by retrofitting it with the Bio-Unit so as to meet produced water quality requirement for reinjection into oil reservoir or disposal to the environment.
Abstract: This work investigated the biodetoxification of oilfield produced water (OPW) using indigenous microbial consortium in discontinuous aerobic biological treatment (Bio-Unit) system. The pilot scale Bio-Unit has a single tank that is operated cyclically. The Bio-Unit performance was compared with that of an extant physical treatment unit (PTU) of a c...
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