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Wen S, Huang J, Li W, Wu M, Steyskal F, Meng J, Xu X, Hou P, Tang J. Henna plant biomass enhanced azo dye removal: Operating performance, microbial community and machine learning modeling. CHEMOSPHERE 2024; 352:141471. [PMID: 38373445 DOI: 10.1016/j.chemosphere.2024.141471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 12/17/2023] [Accepted: 02/14/2024] [Indexed: 02/21/2024]
Abstract
The bio-reduction of azo dyes is significantly dependent on the availability of electron donors and external redox mediators. In this study, the natural henna plant biomass was supplemented to promote the biological reduction of an azo dye of Acid Orange 7 (AO7). Besides, the machine learning (ML) approach was applied to decipher the intricate process of henna-assisted azo dye removal. The experimental results indicated that the hydrolysis and fermentation of henna plant biomass provided both electron donors such as volatile fatty acid (VFA) and redox mediator of lawsone to drive the bio-reduction of AO7 to sulfanilic acid (SA). The high henna dosage selectively enriched certain bacteria, such as Firmicutes phylum, Levilinea and Paludibacter genera, functioning in both the henna fermentation and AO7 reduction processes simultaneously. Among the three tested ML algorithms, eXtreme Gradient Boosting (XGBoost) presented exceptional accuracy and generalization ability in predicting the effluent AO7 concentrations with pH, oxidation-reduction potential (ORP), soluble chemical oxygen demand (SCOD), VFA, lawsone, henna dosage, and cumulative henna as input variables. The validating experiments with tailored optimal operating conditions and henna dosage (pH 7.5, henna dosage of 2 g/L, and cumulative henna of 14 g/L) confirmed that XGBoost was an effective ML model to predict the efficient AO7 removal (91.6%), with a negligible calculating error of 3.95%. Overall, henna plant biomass addition was a cost-effective and robust method to improve the bio-reduction of AO7, which had been demonstrated by long-term operation, ML modeling, and experimental validation.
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Affiliation(s)
- Shilin Wen
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Jingang Huang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China; China-Austria Belt and Road Joint Laboratory on Artificial Intelligence and Advanced Manufacturing, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Weishuai Li
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Mengke Wu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Felix Steyskal
- China-Austria Belt and Road Joint Laboratory on Artificial Intelligence and Advanced Manufacturing, Hangzhou Dianzi University, Hangzhou, 310018, PR China; M-U-T Maschinen-Umwelttechnik-Transportanlagen GmbH, Stockerau, 2000, Austria
| | - Jianfang Meng
- China-Austria Belt and Road Joint Laboratory on Artificial Intelligence and Advanced Manufacturing, Hangzhou Dianzi University, Hangzhou, 310018, PR China; M-U-T Maschinen-Umwelttechnik-Transportanlagen GmbH, Stockerau, 2000, Austria
| | - Xiaobin Xu
- China-Austria Belt and Road Joint Laboratory on Artificial Intelligence and Advanced Manufacturing, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Pingzhi Hou
- China-Austria Belt and Road Joint Laboratory on Artificial Intelligence and Advanced Manufacturing, Hangzhou Dianzi University, Hangzhou, 310018, PR China
| | - Junhong Tang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
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Long B, Liao L, Jia F, Luo Y, He J, Zhang W, Shi J. Oxalic acid enhances bioremediation of Cr(VI) contaminated soil using Penicillium oxalicum SL2. CHEMOSPHERE 2023; 311:136973. [PMID: 36283433 DOI: 10.1016/j.chemosphere.2022.136973] [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: 07/26/2022] [Revised: 10/16/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Oxalic acid is the most abundant low molecular weight organic acid (LMWOA) in many environments and offers enormous prospects for treating Cr(VI) contamination. In this study, laboratory batch experiments were conducted to estimate the roles of oxalic acid in Cr(VI) removal by Penicillium oxalicum SL2. Oxalic acid changed the initial pH and provided a suitable condition for the growth of strain SL2 when the penicillium was applied to bioremediation of Cr(VI) contamination in alkaline soil. Gompertz model analysis indicated that initial pH affected the lag time of the growth curve of strain SL2. Scanning electron microscopy and scanning transmission X-ray microscopy analysis showed strain SL2 sufficiently contacted with contaminated soil and reduced Cr(VI) to Cr(III) in the hyphae. The results suggested that oxalic acid could enhance the bioremediation efficiency of strain SL2 though improving chromium bioleaching from the contaminated soil and strengthening Cr(VI) removal in the leaching solution. This study provided oxalic acid as a green reagent for stimulating Cr(VI) removal by strain SL2 and would expand knowledge on the roles of LMWOA in Cr(VI) bioremediation.
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Affiliation(s)
- Bibo Long
- Institute of Biological and Medical Engineering, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510316, China; Department of Environmental Engineering, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lingling Liao
- CVC Certification and Testing Company Limited, Guangzhou, Guangdong, 510799, China
| | - Fei Jia
- Zhejiang Jiuhe Geological and Ecological Environment Planning and Design Company, Huzhou, Zhejiang, 313002, China
| | - Yating Luo
- Department of Environmental Engineering, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Junyu He
- Ocean College, Zhejiang University, Zhoushan, Zhejiang, 316021, China
| | - Wenhua Zhang
- Institute of Biological and Medical Engineering, Guangdong Academy of Sciences, Guangzhou, Guangdong, 510316, China
| | - Jiyan Shi
- Department of Environmental Engineering, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
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Wu G, Liu Q, Wang J, Xia S, Huang X, Han J, Xing W. Construction of hierarchical Bi2WO6/ZnIn2S4 heterojunction for boosting photocatalytic performance in degradation of organic compounds and reduction of hexavalent chromium. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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