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Tian K, Zhang J, Zhou C, Yang M, Zhang X, Yan X, Zang L. Magnetic nitrogen-doped activated carbon improved biohydrogen production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:87215-87227. [PMID: 37420156 DOI: 10.1007/s11356-023-28584-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 06/29/2023] [Indexed: 07/09/2023]
Abstract
Low biological hydrogen (bioH2) production due to non-optimal metabolic pathways occurs frequently. In this work, magnetic nitrogen-doped activated carbon (MNAC) was prepared and added into the inoculated sludge with glucose as substrate to enhance hydrogen (H2) yield by mesophilic dark fermentation (DF). The highest H2 yield appeared in 400 mg/L AC (252.8 mL/g glucose) and 600 mg/L MNAC group (304.8 mL/g glucose), which were 26.02% and 51.94% higher than that of 0 mg/L MNAC group (200.6 mL/g glucose). The addition of MNAC allowed for efficient enrichment of Firmicutes and Clostridium-sensu-stricto-1, accelerating the metabolic pathway shifted towards butyrate type. The Fe ions released by MNAC facilitated electron transfer and favored the reduction of ferredoxin (Fd), thereby obtaining more bioH2. Finally, the generation of [Fe-Fe] hydrogenase and cellular components of H2-producing microbes (HPM) during homeostasis was discussed to understand on the use of MNAC in DF system.
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Affiliation(s)
- Kexin Tian
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
| | - Jishi Zhang
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China.
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China.
| | - Chen Zhou
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
| | - Mengchen Yang
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
| | - Xiaoying Zhang
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
| | - Xiao Yan
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
| | - Lihua Zang
- College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No.3501 Daxue Road, Jinan, 250353, China
- Engineering Laboratory of Clean Energy for Light Industrial Wastes of Shandong, Jinan, 250353, China
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Automated Inorganic Pigment Classification in Plastic Material Using Terahertz Spectroscopy. SENSORS 2021; 21:s21144709. [PMID: 34300449 PMCID: PMC8309565 DOI: 10.3390/s21144709] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/05/2021] [Accepted: 07/07/2021] [Indexed: 11/17/2022]
Abstract
This paper presents an automatic classification of plastic material's inorganic pigment using terahertz spectroscopy and convolutional neural networks (CNN). The plastic materials were placed between the THz transmitter and receiver, and the acquired THz signals were classified using a supervised learning approach. A THz frequency band between 0.1-1.2 THz produced a one-dimensional (1D) vector that is almost impossible to classify directly using supervised learning. This paper proposes a novel pre-processing of 1D THz data that transforms 1D data into 2D data, which are processed efficiently using a convolutional neural network. The proposed pre-processing algorithm consists of four steps: peak detection, envelope extraction, and a down-sampling procedure. The last main step introduces the windowing with spectrum dilatation that reorders 1D data into 2D data that can be considered as an image. The spectrum dilation techniques ensure the classifier's robustness by suppressing measurement bias, reducing the complexity of the THz dataset with negligible loss of accuracy, and speeding up the network classification. The experimental results showed that the proposed approach achieved high accuracy using a CNN classifier, and outperforms 1D classification of THz data using support vector machine, naive Bayes, and other popular classification algorithms.
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Wang Q, Li H, Feng K. Effect of honeycomb, granular, and powder activated carbon additives on continuous lactic acid fermentation of complex food waste with mixed inoculation. J Biosci Bioeng 2021; 131:655-662. [PMID: 33775543 DOI: 10.1016/j.jbiosc.2021.02.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 01/31/2023]
Abstract
To accelerate and stabilize lactic acid fermentation from food waste, three types of activated carbon, including honeycomb activated carbon, granular activated carbon, and powder activated carbon, were tested as additives in continuous food waste fermentation processes. The results showed that carbohydrate was the primary substrate for lactic acid production, but its conversion reached a high, stable level after a long period of microbial acclimation in the control system. Activated carbon, especially honeycomb activated carbon accelerated the stabilization of lactic acid fermentation and enhanced the tolerance of fermentation systems to a hostile and fluctuating environment. The addition of activated carbon increased the oxidation-reduction potential to approximately 100 mV and altered the microbial communities. Homolactic fermentation bacteria were dominant in all the systems, and the honeycomb activated carbon addition stimulated the growth of unclassified Lactobacillus and immobilized Lactobacillus panis with strong carbohydrate metabolism. In addition, powder activated carbon enhanced the degradation of protein due to the multiplying Pseudomonas. At the stable stage, the organic conversion rates were close in the control system and the systems with the activated carbon addition, and the lactic acid concentrations in these systems remained at 8000-10,000 mg/L. Considering the cost of the additives, honeycomb activated carbon is a good choice to stabilize lactic acid production from food waste.
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Affiliation(s)
- Qiao Wang
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Huan Li
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
| | - Kai Feng
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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Lu JH, Chen C, Huang C, Lee DJ. Glucose fermentation with biochar-amended consortium: microbial consortium shift. Bioengineered 2020; 11:272-280. [PMID: 32100613 PMCID: PMC7161558 DOI: 10.1080/21655979.2020.1735668] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 02/23/2020] [Accepted: 02/24/2020] [Indexed: 11/11/2022] Open
Abstract
The effects of adding biochar rice husk (R), white popinee (WP), bamboo (BB), or coconut (CT) on microbial community in fermentation broths from glucose were investigated. The added biochars acted as biofilm carriers on which Sporolactobacillus spathodeae, Clostridium sensu stricto 11 sp., Clostridium sensu stricto 12 sp., Clostridium sensu stricto 1 sp., and Clostridium sensu stricto 5 sp. were enriched. Fermentation reactions substantially increased the amounts of acid-producers in biofilm. The homoacetogens, Clostridium carboxidivorans and Clostridium drakei, were identified in the biofilm in the first two batches of fermentation with biochars as electron conductors between acid-producers and homoacetogens to assist homoacetogenesis. The heterotrophic bacteria overcompeted the acid-producers in the biofilm in long-term fermentation.
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Affiliation(s)
- Jia-Hsun Lu
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Chuan Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China
| | - Chihpin Huang
- Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
- College of Engineering, Tunghai University, Taichung, Taiwan
- College of Technology and Engineering, National Taiwan Normal University, Taipei, Taiwan
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Zhai S, Li M, Xiong Y, Wang D, Fu S. Dual resource utilization for tannery sludge: Effects of sludge biochars (BCs) on volatile fatty acids (VFAs) production from sludge anaerobic digestion. BIORESOURCE TECHNOLOGY 2020; 316:123903. [PMID: 32763801 DOI: 10.1016/j.biortech.2020.123903] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/19/2020] [Accepted: 07/21/2020] [Indexed: 05/22/2023]
Abstract
Resource utilization of organic matters in tannery sludge has drawn great attention. In this paper, the influences of sludge biochars (BCs) on volatile fatty acids (VFAs) production from the anaerobic digestion of sludge supernatant (SST) were investigated. Experimental results demonstrated that the VFAs yields improved in the presence of BCs with rich functional groups. The maximum yield of VFAs was 1037.5 mg/g SCOD with the addition of BC-1 biochar (zeta potential -50.42 mV). BCs decreased ammonia nitrogen concentration, thus reducing inhibition for bacteria during the anaerobic digestion. Microbial community analysis indicated that the BCs affected microbial community structures and contributed to a favorable environment for bacteria. Especially, the BC-1 biochar with rich functional groups enhanced the relative abundance of acid-forming bacteria (Clostridiales). A dual strategy was proposed to improve the resource utilization efficiency for tannery sludge.
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Affiliation(s)
- Shimin Zhai
- Jiangsu Engineering Research Center For Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Min Li
- Jiangsu Engineering Research Center For Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Yonghui Xiong
- Jiangsu Engineering Research Center For Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China; Suzhou Sunmun Technology Co.,Ltd, Kunshan, Suzhou, Jiangsu 215337, China
| | - Dong Wang
- Jiangsu Engineering Research Center For Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Shaohai Fu
- Jiangsu Engineering Research Center For Digital Textile Inkjet Printing, Key Laboratory of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China; Suzhou Sunmun Technology Co.,Ltd, Kunshan, Suzhou, Jiangsu 215337, China.
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Amorim CA, Blanco KC, Costa IM, de Araújo EP, Arantes ADN, Contiero J, Chiquito AJ. A New Possibility for Fermentation Monitoring by Electrical Driven Sensing of Ultraviolet Light and Glucose. BIOSENSORS-BASEL 2020; 10:bios10080097. [PMID: 32806501 PMCID: PMC7459838 DOI: 10.3390/bios10080097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/21/2020] [Accepted: 07/23/2020] [Indexed: 12/14/2022]
Abstract
Industrial fermentation generates products through microbial growth associated with the consumption of substrates. The efficiency of industrial production of high commercial value microbial products such as ethanol from glucose (GLU) is dependent on bacterial contamination. Controlling the sugar conversion into products as well as the sterility of the fermentation process are objectives to be considered here by studying GLU and ultraviolet light (UV) sensors. In this work, we present two different approaches of SnO2 nanowires grown by the Vapor–Liquid–Solid (VLS) method. In the GLU sensor, we use SnO2 nanowires as active electrodes, while for the UV sensor, a nanowire film was built for detection. The results showed a wide range of GLU sensing and as well as a significant influence of UV in the electrical signal. The effect of a wide range of GLU concentrations on the responsiveness of the sensor through current–voltage based on SnO2 nanowire films under different concentration conditions ranging was verified from 1 to 1000 mmol. UV sensors show a typical amperometric response of SnO2 nanowires under the excitation of UV and GLU in ten cycles of 300 s with 1.0 V observing a stable and reliable amperometric response. GLU and UV sensors proved to have a promising potential for detection and to control the conversion of a substrate into a product by GLU control and decontamination by UV control in industrial fermentation systems.
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Affiliation(s)
- Cleber A. Amorim
- School of Sciences and Engineering, Av. Domingos da Costa Lopes, São Paulo State University (Unesp), 780 Jardim Itaipu, CEP 17602-496 Tupã, SP, Brazil;
| | - Kate C. Blanco
- São Carlos Institute of Physics, University of São Paulo—Box 369, 13566-970, São Carlos, SP, Brazil;
| | - Ivani M. Costa
- NanOLaB, Departamento de Física, Universidade Federal de São Carlos—UFSCar, Rodovia Washington Luiz, Km 235 Monjolinho, CP 676, CEP 13565-905 São Carlos, SP, Brazil; (I.M.C.); (E.P.d.A.); (A.d.N.A.); (A.J.C.)
- Institute of Chemistry, Araraquara. Rua Professor Francisco Degni, São Paulo State University (Unesp), Jardim Quitandinha, CEP 14800-060 Araraquara, SP, Brazil
| | - Estácio P. de Araújo
- NanOLaB, Departamento de Física, Universidade Federal de São Carlos—UFSCar, Rodovia Washington Luiz, Km 235 Monjolinho, CP 676, CEP 13565-905 São Carlos, SP, Brazil; (I.M.C.); (E.P.d.A.); (A.d.N.A.); (A.J.C.)
| | - Adryelle do Nascimento Arantes
- NanOLaB, Departamento de Física, Universidade Federal de São Carlos—UFSCar, Rodovia Washington Luiz, Km 235 Monjolinho, CP 676, CEP 13565-905 São Carlos, SP, Brazil; (I.M.C.); (E.P.d.A.); (A.d.N.A.); (A.J.C.)
| | - Jonas Contiero
- Institute of Biosciences, Department of General and Applied Biology, São Paulo State University (Unesp), Rio Claro, Rio Claro, Av. 24-A, 1515 Bela Vista, CEP 13506-692 Rio Claro, SP, Brazil
- Institute for Research in Bioenergy, São Paulo State University (Unesp) Rua 10, 2527 Santana, CEP 13500-230 Rio Claro, SP, Brazil
- Correspondence: ; Tel.: +55-(019)-35264149
| | - Adenilson J. Chiquito
- NanOLaB, Departamento de Física, Universidade Federal de São Carlos—UFSCar, Rodovia Washington Luiz, Km 235 Monjolinho, CP 676, CEP 13565-905 São Carlos, SP, Brazil; (I.M.C.); (E.P.d.A.); (A.d.N.A.); (A.J.C.)
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Yang CH, Chang JS, Lee DJ. Covalent organic framework EB-COF:Br as adsorbent for phosphorus (V) or arsenic (V) removal from nearly neutral waters. CHEMOSPHERE 2020; 253:126736. [PMID: 32302910 DOI: 10.1016/j.chemosphere.2020.126736] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/26/2020] [Accepted: 04/04/2020] [Indexed: 05/27/2023]
Abstract
The covalent organic framework (COF) is made light elements linked by covalent networks. This study synthesize and characterized, and for the first time applied the produced EB-COF:Br as adsorbent for phosphate and arsenate removal from nearly neutral waters. The synthesized COF was first proven structurally stable in solutions of 75% H3PO4, 6 M HCl, or 6 M NaOH. Then the phosphate adsorption onto the EB-COF:Br was shown to be an endothermic process with maximum adsorption capacity at 25, 35 and 45 °C as 25.3, 34.7 and 35.3 mg/g COF, respectively; and the corresponding arsenate adsorption process being an exothermic process with maximnum adsorption capacity as 53.1, 27.5 and 5.1 mg/g, respectively. The synthesized COF could also effectively adsorb phosphate and arsenate ions from river water (pH 7.45) but at reduced adsorption capacities. The electrostatic interactions between the negative charge on phosphate or arsenate ions and the positively charged (N+-) of COF, and the hydrogen bondings between H atom on phosphate or arsenate ions and the (-CO) group of COF were the dominating mechanisms for the present adsorption process. The strong electrostatic interactions for arsenate contributed to its higer adsorption capacity than noted for phosphate at 25 °C. However, the disturbed hydrogen bonding induced by mismatched sizes of arsenate ion and the adsorption sites surrounded by the (N+-) and the (-CO) groups reduced the stability of arsenate to against temperature and external anion challenges. The use of the EB-COF; Br as industrial adsorbent was also discussed.
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Affiliation(s)
- Cheng-Hao Yang
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan
| | - Jo-Shu Chang
- Department of Chemical Engineering, College of Engineering, Tunghai University, Taichung, 40704, Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan; Department of Chemical Engineering, College of Engineering, Tunghai University, Taichung, 40704, Taiwan; National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.
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