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Negi BB, Aliveli M, Behera SK, Das R, Sinharoy A, Rene ER, Pakshirajan K. Predictive modelling and optimization of an airlift bioreactor for selenite removal from wastewater using artificial neural networks and particle swarm optimization. ENVIRONMENTAL RESEARCH 2023; 219:115073. [PMID: 36535392 DOI: 10.1016/j.envres.2022.115073] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Selenite (Se4+) is the most toxic of all the oxyanion forms of selenium. In this study, a feed forward back propagation (BP) based artificial neural network (ANN) model was developed for a fungal pelleted airlift bioreactor (ALR) system treating selenite-laden wastewater. The performance of the bioreactor, i.e., selenite removal efficiency (REselenite) (%) was predicted through two input parameters, namely, the influent selenite concentration (ICselenite) (10 mg/L - 60 mg/L) and hydraulic retention time (HRT) (24 h - 72 h). After training and testing with 96 sets of data points using the Levenberg-Marquardt algorithm, a multi-layer perceptron model (2-10-1) was established. High values of the correlation coefficient (0.96 ≤ R ≤ 0.98), along with low root mean square error (1.72 ≤ RMSE ≤ 2.81) and mean absolute percentage error (1.67 ≤ MAPE ≤ 2.67), clearly demonstrate the accuracy of the ANN model (> 96%) when compared to the experimental data. To ensure an efficient and economically feasible operation of the ALR, the process parameters were optimized using the particle swarm optimization (PSO) algorithm coupled with the neural model. The REselenite was maximized while minimizing the HRT for a preferably higher range of ICselenite. Thus, the most favourable optimum conditions were suggested as: ICselenite - 50.45 mg/L and HRT - 24 h, resulting in REselenite of 69.4%. Overall, it can be inferred that ANN models can successfully substitute knowledge-based models to predict the REselenite in an ALR, and the process parameters can be effectively optimized using PSO.
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Affiliation(s)
- Bharat Bhushan Negi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781 039, Assam, India.
| | - Mansi Aliveli
- Process Simulation Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, 632 014, Tamil Nadu, India.
| | - Shishir Kumar Behera
- Process Simulation Research Group, School of Chemical Engineering, Vellore Institute of Technology, Vellore, 632 014, Tamil Nadu, India.
| | - Raja Das
- Department of Mathematics, School of Advanced Sciences, Vellore Institute of Technology, Vellore, 632 014, Tamil Nadu, India.
| | - Arindam Sinharoy
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781 039, Assam, India; Department of Microbiology, School of Natural Sciences and Ryan Institute, National University of Ireland, Galway, Ireland.
| | - Eldon R Rene
- Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, Westvest 7, 2611AX, Delft, the Netherlands.
| | - Kannan Pakshirajan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781 039, Assam, India.
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Lian S, Qu Y, Dai C, Li S, Jing J, Sun L, Yang Y. Succession of function, assembly, and interaction of microbial community in sequencing biofilm batch reactors under selenite stress. ENVIRONMENTAL RESEARCH 2022; 212:113605. [PMID: 35660567 DOI: 10.1016/j.envres.2022.113605] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 05/30/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
The mechanism of interaction between selenite, a toxic substance, and the microbial community in wastewater is still not well understood. Herein, nine sequencing biofilm batch reactors were used to systematically investigate the response of the microbial community to the continuous selenite stress. The results showed that selenite affected the reactor performance and reduced the biofilm mass. Also, it increased the proportion of the living cells, and changed the protein and polysaccharide composition of the biofilm as well as cellular secretions. Selenite facilitated the removal of NO3-N, according to water-quality and bioinformatics analyses. As such, the selenite was converted into selenium nanoparticles. α-diversity analysis further revealed that 20 μM selenite enhanced the microbial community resilience, while 200 μM selenite had the reverse effect. Community composition analysis showed that Variovorax, Rhizobium, and Simkania had positive correlations with selenite (P < 0.05). Functional prediction suggested that selenite changed the C, N, and S cycle functions. Furthermore, determinism dominated the community assembly process, and the deterministic proportion increased with the increase of selenite concentration. Network analysis showed that selenite improved the stability and positive correlation ratio of the overall microbial network, and accelerated the communication between microorganisms. However, when compared with the 20 μM selenite, the 200 μM selenite boosted the competition and parasitism/predation among microorganisms. Low-abundance genera played a key role in the network of selenite-reducing microbial community. In addition, under selenite stress, biofilm network exhibited better stability and faster information exchange than suspended network, and the positive association between biofilm and suspended microorganisms increased. All in all, this research sheds light on the interaction between selenite and microbial community, as well as provides crucial information on selenium-containing wastewater.
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Affiliation(s)
- Shengyang Lian
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Yuanyuan Qu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
| | - Chunxiao Dai
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Shuzhen Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Jiawei Jing
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Lu Sun
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Ying Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian POCT Laboratory, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
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Zhang X, Wang L, Zeng T, Liu Y, Wang G, Liu J, Wang A. The removal of selenite and cadmium by immobilized biospheres: Efficiency, mechanisms and bacterial community. ENVIRONMENTAL RESEARCH 2022; 211:113025. [PMID: 35278470 DOI: 10.1016/j.envres.2022.113025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 02/19/2022] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
In this study, a complex bacterial consortium was enriched from a typical Pb-Zn mine area and immobilized by sodium alginate to form biospheres, which were used for treatment of selenite (Se(IV))- and cadmium (Cd(II))-containing wastewater without external carbon source. Batch experiments showed that the maximum Se(IV) removal efficiency was 92.36% under the optimal conditions of an initial pH of 5, dosage of 5 g/L, initial Se(IV) concentration of 7.9 mg/L and reaction time of 168 h. Subsequently, more than 99% of 11.2 mg/L Cd(II) was removed by the biospheres within 10 h. Physicochemical characterization showed that reduction and adsorption were the main mechanisms for Se(IV) and Cd(II) removal, respectively. During the removal process, selenium and CdSe nanoparticles were formed. Bacterial community analysis showed the dominant bacterial genera changed after treatment of Se(IV)- and Cd(II)-containing wastewater. Additionally, 16S rRNA gene function prediction results showed that amino acid transport, carbohydrate transport, ion transport and metabolism were the dominant gene functions. The present study provides a potential way for the biological treatment of Se(IV)- and Cd(II)-containing wastewater using immobilized biospheres without external carbon source in short-term.
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Affiliation(s)
- Xiaoling Zhang
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
| | - Liangqin Wang
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
| | - Taotao Zeng
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China.
| | - Yingjiu Liu
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
| | - Guohua Wang
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
| | - Jinxiang Liu
- Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, 421001, China
| | - Aijie Wang
- Key Laboratory of Environmental Biotechnology, Chinese Academy of Sciences, Beijing, 100085, China
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Saud A, Saleem H, Zaidi SJ. Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment. MEMBRANES 2022; 12:membranes12050462. [PMID: 35629789 PMCID: PMC9147932 DOI: 10.3390/membranes12050462] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 12/10/2022]
Abstract
Membrane-based desalination has proved to be the best solution for solving the water shortage issues globally. Membranes are extremely beneficial in the effective recovery of clean water from contaminated water sources, however, the durability as well as the separation efficiency of the membranes are restricted by the type of membrane materials/additives used in the preparation processes. Nanocellulose is one of the most promising green materials for nanocomposite preparation due to its biodegradability, renewability, abundance, easy modification, and exceptional mechanical properties. This nanocellulose has been used in membrane development for desalination application in the recent past. The study discusses the application of membranes based on different nanocellulose forms such as cellulose nanocrystals, cellulose nanofibrils, and bacterial nanocellulose for water desalination applications such as nanofiltration, reverse osmosis, pervaporation, forward osmosis, and membrane distillation. From the analysis of studies, it was confirmed that the nanocellulose-based membranes are effective in the desalination application. The chemical modification of nanocellulose can definitely improve the surface affinity as well as the reactivity of membranes for the efficient separation of specific contaminants/ions.
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Affiliation(s)
- Asif Saud
- Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar; (A.S.); (H.S.)
- Industrial Chemistry, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Haleema Saleem
- Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar; (A.S.); (H.S.)
| | - Syed Javaid Zaidi
- Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar; (A.S.); (H.S.)
- Correspondence: ; Tel.: +974-44037723
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Yan S, Cheng KY, Ginige MP, Zheng G, Zhou L, Kaksonen AH. High-rate microbial selenate reduction in an up-flow anaerobic fluidized bed reactor (FBR). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 749:142359. [PMID: 33370900 DOI: 10.1016/j.scitotenv.2020.142359] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/13/2020] [Accepted: 09/10/2020] [Indexed: 06/12/2023]
Abstract
Wastewater contaminated with high concentrations of selenium oxyanions requires treatment prior to discharge. Biological fluidized bed reactors (FBRs) can be an option for removing selenium oxyanions from wastewater by converting them into elemental selenium, which can be separated from the treated effluent. In this study, a lab-scale FBR was constructed with granular activated carbon as biofilm carrier and inoculated with a consortium of selenate reducing bacteria enriched from environmental samples. The FBR was loaded with an influent containing ethanol (10 mM) and selenate (10 mM) as the microbial electron donor and acceptor, respectively. The performance of the FBR in reducing selenate was evaluated under various hydraulic retention times (HRTs) (120 h, 72 h, 48 h, 24 h, 12 h, 6 h, 3 h, 1 h and 20 min). After process acclimatization, selenate was completely removed with no notable selenite produced when the HRT was stepwise decreased from 120 h to 6 h. However, decreasing the HRT to 3 h resulted in selenite accumulation (0.17 ± 0.023 mM) in the effluent although selenate removal efficiency remained at 99.8 ± 0.20%. At 1 h HRT, the FBR removed 90.8 ± 1.4% of the selenate at a rate of 9.6 ± 0.15 mM h-1, which is the highest selenate reduction rate reported in the literature so far. However, 1 h HRT resulted in notable selenite accumulation (up to 2.4 ± 0.27 mM). Further decreasing the HRT to 20 min resulted in a notable decline in selenate reduction. Selenate reduction recovered from the "shock loading" after the HRT was increased back to 3 h. However, selenite still accumulated until the FBR was operated in batch mode for 6 days. This study affirmed that FBR is a promising treatment option for selenate-rich wastewater, and the process can be efficiently operated at low HRTs.
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Affiliation(s)
- Su Yan
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia; Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Ka Yu Cheng
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia; School of Engineering and Information Technology, Murdoch University, Perth, WA, Australia
| | - Maneesha P Ginige
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Guanyu Zheng
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Lixiang Zhou
- Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Anna H Kaksonen
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia; School of Biomedical Sciences, The University of Western Australia, 35 Stirling Highway, Nedlands, Western Australia 6009, Australia.
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Ojeda JJ, Merroun ML, Tugarova AV, Lampis S, Kamnev AA, Gardiner PHE. Developments in the study and applications of bacterial transformations of selenium species. Crit Rev Biotechnol 2020; 40:1250-1264. [PMID: 32854560 DOI: 10.1080/07388551.2020.1811199] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Microbial bio-transformations of the essential trace element selenium are now recognized to occur among a wide variety of microorganisms. These transformations are used to convert this element into its assimilated form of selenocysteine, which is at the active center of a number of key enzymes, and to produce selenium nanoparticles, quantum dots, metal selenides, and methylated selenium species that are indispensable for biotechnological and bioremediation applications. The focus of this review is to present the state-of-the-art of all aspects of the investigations into the bacterial transformations of selenium species, and to consider the characterization and biotechnological uses of these transformations and their products.
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Affiliation(s)
- Jesus J Ojeda
- College of Engineering, Swansea University, Systems and Process Engineering Centre, Swansea, UK
| | | | - Anna V Tugarova
- Laboratory of Biochemistry, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia
| | - Silvia Lampis
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Alexander A Kamnev
- Laboratory of Biochemistry, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia
| | - Philip H E Gardiner
- Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield, UK
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Biotreatment of high-salinity wastewater: current methods and future directions. World J Microbiol Biotechnol 2020; 36:37. [DOI: 10.1007/s11274-020-02815-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 02/20/2020] [Indexed: 12/16/2022]
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Zhang Y, Kuroda M, Arai S, Kato F, Inoue D, Ike M. Biological treatment of selenate-containing saline wastewater by activated sludge under oxygen-limiting conditions. WATER RESEARCH 2019; 154:327-335. [PMID: 30818098 DOI: 10.1016/j.watres.2019.01.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 01/28/2019] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
Selenium often coincides with high salinity in certain industrial wastewaters, which can be a limitation in the practical application of biological treatment. However, there are no studies on the biological treatment of selenate-containing saline wastewater. A sequencing batch reactor inoculated with activated sludge was applied to treat selenate in the presence of 3% (w/v) NaCl. Start-up of the sequencing batch reactor with a 7-day cycle duration and excessive acetate as the sole carbon source succeeded in removing above 98% and 72% soluble and solid selenium, respectively, under oxygen-limiting conditions. Further selenium removal experiments with a shorter cycle duration of 3 days and a stepwise decrease of acetate addition achieved soluble and total selenium removal efficiencies in most batches above 96% and 80%, respectively. Mass balance analysis revealed that selenate was converted into elemental selenium, most of which was accumulated in the sludge. Microscopic analyses also found that elemental selenium particles were primarily present as approximately 2 μm large rods, with some extremely large particles above 10 μm. Although the bacterial populations responsible for selenium removal, especially selenate reduction, could not be identified by microbial community analysis, this study reported for the first time that selenate could be biologically treated in the presence of considerable salinity, offering implications for the practical treatment of selenium in certain industrial wastewaters.
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Affiliation(s)
- Yuanyuan Zhang
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masashi Kuroda
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Shunsuke Arai
- Nippon Steel & Sumitomo Metal Corporation, 20-1 Shintomi, Futtu, Chiba, 293-8511, Japan
| | - Fumitaka Kato
- Nippon Steel & Sumitomo Metal Corporation, 20-1 Shintomi, Futtu, Chiba, 293-8511, Japan
| | - Daisuke Inoue
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Michihiko Ike
- Division of Sustainable Energy and Environmental Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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