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105. Recovering Valuable Chemicals from Polypropylene Waste via a Mild Catalyst-Free Hydrothermal Process

Author

Xu, Qiongying, Wang, Qiandi, Yang, Jiaqi, Liu, Wenzong, and Wang, Aijie

Abstract

Waste polypropylene (PP) presents a significant environmental challenge, owing to its refractory nature and inert C–C backbone. In this study, we introduce a practical chemical recovery strategy from PP waste using a mild catalyst-free hydrothermal treatment (HT). The treatment converts 64.1% of the processed PP into dissolved organic products within 2 h in an air atmosphere at 160 °C. Higher temperatures increase the PP conversion efficiency. Distinct electron absorption and emission characteristics of the products are identified by spectral analysis. Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS) reveals the oxidative cracking of PP into shorter-chain homologues (10–50 carbon atoms) containing carboxylic and carbonyl groups. Density functional theory (DFT) calculations support a reaction pathway involving thermal C–H oxidation at the tertiary carbon sites in the polymer chain. The addition of 1% H2O2further enhances the oxidation reaction to produce valuable short-chain acetic acids, enabling gram-scale recycling of both pure PP and disposable surgical masks from the real world. Techno-economic analysis (TEA) and environmental life cycle costing (E-LCC) analysis suggest that this hydrothermal oxidation recovery technology is financially viable, which shows significant potential in tackling the ongoing plastic pollution crisis and advancing plastic treatment methodologies toward a circular economy paradigm.

Published
2024
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107. Syntrophic Jiont of Sulfate-Reducing Bacteria and Hydrogen-Producing Acetogen Stimulated Methane Production from Waste Activated Sludge Digestion.

Author

Wu, Haokun, Zhou, Aijuan, Duan, Yanqing, Liu, Zhihong, He, Zhangwei, Liu, Wenzong, and Yue, Xiuping

Subjects
SEWAGE sludge digestion, SULFATE-reducing bacteria, METHANE as fuel, METHANE, ANAEROBIC digestion, BIOGAS
Abstract

Anaerobic digestion of waste-activated sludge (WAS) towards biogas recovery is constrained by the limited hydrolysis and inhibited acetogenesis steps that hinder subsequent energy recovery. This study employed Fe(VI)/S(IV) oxidation to enhance the WAS solubilization and coupled it with the syntrophic interaction of hydrogen-producing acetogen (HPA) and sulfate-reducing bacteria (SRB) to stimulate the successive procedure towards methane production. Results showed that the dosage ratio of HPA-SRB to WAS (H-S-W) with 1:1:50 outperformed with the highest methane production potential (11.63 ± 1.87 mL CH4/(g VSS·d). Meanwhile, the efficient and sequential process from acetogenesis to methanogenesis stimulated by HPA-SRB was evidenced by a significant decrease of 30.2% in the acetate concentration. The microbial community structure further manifested the crucial role of HPA-SRB with increased abundance of Desulfobulbus (2.07%), Syntrophomonas (1.24%) and Smithella (1.63%), which stimulated acetophilic methanogen boost with Methanobacterium dominating with 77.51% in H-S-W100. Furthermore, the positive syntrophic relationships among HPA-SRB and acetophilic methanogens towards methane production were confirmed via molecular ecological network and canonical correspondence analysis. This study highlighted the syntrophic cooperation of the mixed consortia of HPA and SRB on methane production based on Fe(VI)/S(IV) pretreatment and provided the theoretical and technical basis for the potential implementation of novel methanogenesis technology for WAS treatment. [ABSTRACT FROM AUTHOR]

Published
2024
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120. Contributors

Author

Abbassi, Rouzbeh, primary, Abu-Reesh, Ibrahim M., additional, Arcila, Juan S., additional, Arunasri, Kotakonda, additional, Baeza, Juan Antonio, additional, Blázquez, Enric, additional, Borole, Abhijeet P., additional, Buitrón, Germán, additional, Butti, Sai Kishore, additional, Cardeña, René, additional, Castillo-Zacarias, Carlos, additional, Chandra, Rashmi, additional, Chandrasekhar, K., additional, Cheng, Ka Yu, additional, Chilkoor, Govinda, additional, Chiranjeevi, P., additional, Civelek Yoruklu, Hulya, additional, Costa, Nazua L., additional, Das, Debabrata, additional, Demir, Ahmet, additional, Desai, Chirayu, additional, Desale, Pridhviraj, additional, Dhar, Bipro Ranjan, additional, Dharmalingam, Sangeetha, additional, Dhiman, Saurabh Sudha, additional, El Mekawy, Ahmed, additional, Escapa, Adrian, additional, Eswari, J. Satya, additional, Feng, Yujie, additional, Fernandes, Ana P., additional, Fonseca, Bruno M., additional, Gabriel, David, additional, Gadhamshetty, Venkataramana, additional, Gao, Lei, additional, Garaniya, Vikram, additional, Gautam, Rajeev K., additional, Gude, Veera Gnaneswar, additional, Guisasola, Albert, additional, He, Weihua, additional, Hegab, Hanaa M., additional, Hemalatha, Manupati, additional, Hussain, Abid, additional, Jain, Kunal, additional, Johnson, Jenny, additional, Jung, Sokhee P., additional, Kakarla, Ramesh, additional, Kalola, Vidhi, additional, Karthikeyan, Rengasamy, additional, Kilduff, James, additional, Kokabian, Bahareh, additional, Kondaveeti, Sanath, additional, Krishna, K. Vamshi, additional, Kugarajah, Vaidhegi, additional, Kumar, B. Sudheer, additional, Kumar, A. Kiran, additional, Kumar, A. Naresh, additional, Lee, Hyung-Sool, additional, Lens, P.N.L., additional, Lewis, Alex J., additional, Li, Da, additional, Li, Nan, additional, Liu, Jia, additional, Liu, Wenzong, additional, Louro, Ricardo O., additional, Madamwar, Datta, additional, Mancera-Andrade, Elena I., additional, Mateos, Raul, additional, Min, Booki, additional, Modestra, J. Annie, additional, Mohan, S. Venkata, additional, Mohanakrishna, Gunda, additional, Moran, Antonio, additional, Nancharaiah, Y.V., additional, Nikhil, G.N., additional, Oguz Koroglu, Emre, additional, Ozkaya, Bestami, additional, Pandey, Ashok, additional, Pandit, Soumya, additional, Pant, Deepak, additional, Paquete, Catarina M., additional, Pareek, Alka, additional, Parkhey, Piyush, additional, Parra-Saldívar, Roberto, additional, Patil, Sunil A., additional, Prakasham, R.S., additional, Rathinam, Navanietha K., additional, Rathour, Rohit, additional, Reddy, C. Nagendranatha, additional, Reddy, M. Venkateswar, additional, Rivera, Isaac, additional, Roy, Shantonu, additional, Salem, David R., additional, Sani, Rajesh K., additional, Saptoka, Sambhu, additional, Sarkar, Omprakash, additional, Schröder, Uwe, additional, Shrestha, Namita, additional, Silva, Ana V., additional, Sravan, J. Shanthi, additional, Srivastava, Pratiksha, additional, Sugumar, Moogambigai, additional, Sun, Xiaohang, additional, Swathi, Kuchi, additional, Tamboli, Ekant, additional, Tremblay, Pier-Luc, additional, Trindade, Inês B., additional, Vanbroekhoven, Karolien, additional, Varanasi, Jhansi L., additional, Varjani, Sunita, additional, Veerubhotla, Ramya, additional, Velvizhi, G., additional, Vemuri, Bhuvan, additional, Verma, Anil, additional, Wang, Ling, additional, Wang, Xin, additional, Wang, Ai-Jie, additional, Wang, Huanting, additional, Wong, Jonathan W.C., additional, Xia, Lichao, additional, Yadav, Asheesh Kumar, additional, Yeruva, Dileep Kumar, additional, and Zhang, Tian, additional

Published
2019
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144. Renewable energy driving microbial electrochemistry toward carbon neutral

Author

Wang, Bo, Bonné, Robin, Zhang, Yifeng, Wang, Aijie, Liu, Wenzong, Wang, Bo, Bonné, Robin, Zhang, Yifeng, Wang, Aijie, and Liu, Wenzong

Abstract

Microbe-electrode interacted microbial electrochemical systems (MESs) encompasing (electro)microbiology, electrochemistry, and material science, play an ever-increasing role in waste(water) treatment and resource recovery, which are perceived as eco-friendly and bioderived carbon-neutral catalysis technologies. However, external electricity input to drive the microbial metabolism in MESs can be expensive or not environmentally friendly, hampering the broader development of MESs. This perspective summarizes present renewable electricity sources from microbial full cells, salinity gradients, and solar light that have been demonstrated to drive MESs, followed by underexploited renewable power supplies from waste heat, self-powered triboelectric nanogenerators (mechanical energy harvester), etc. Future directions emphasizing electromicrobiology for MESs toward carbon-neutral are remarked.

Published
2022

148. Hydrogen and Methane generation from Biowaste: Enhancement and Upgrading via Bioelectrochemical Systems

Author

Liu Wenzong, Cristiano Varrone, Bo Wang, Aijie Wang, Zhe Yu, Kumar, Prasun, and Kuppam, Chandrasekhar

Subjects
medicine.medical_specialty, Waste management, Biomass, Methane, Anode, chemistry.chemical_compound, Biogas, chemistry, Bioenergy, Bioelectrochemistry, Microbial electrolysis cell, medicine, Environmental science, Resource recovery
Abstract

Bioelectrochemical systems (BESs) are emerging technologies that are based on catalyzing (bio-)anode and (bio-)cathode reactions from waste biomass by exoelectrogenic microorganisms. Microbial electrolysis cell (MEC), which is one of the BESs’ technologies, is typically used to degrade organic wastes or wastewater for bioenergy recovery and biosynthesis. As one of the promising biotechnologies for resource recovery, value-added products have been obtained by MEC- or ME-integrated systems, such as hydrogen, methane, ethanol, etc. The fundamental reactions of (bio-)electron transport through anodic oxidation are well understood and allow us to increase reactor performance and efficiency. More attentions have been recently paid to cathode reactions on proton/electron transport and recovery, with or without microbial activities. Biogas upgrading systems have also been promoted in integrated systems, by combining bioelectrochemistry with various anaerobic processes. This chapter will focus on energy gas generation from waste organics involved in bioelectrochemical pathways and give an overview of bottlenecks and challenges related to this technology.

Published
2021
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150. Illuminating tetracycline: The role of metal coordination in fluorescence emission and its optical detection potential.

Author

Wang, Qiandi, Liu, Wenzong, Xu, Qiongying, Chen, Zhuqi, and Wang, Aijie

Subjects
*FLUORESCENCE yield, *FRONTIER orbitals, *FLUORESCENCE, *TETRACYCLINE, *TETRACYCLINES
Abstract

[Display omitted] • Chelation with Al3+ enhances the intrinsic fluorescence emission of tetracycline. • The emission exhibits far superior sensitivity than the absorption signal. • Molecular motion restriction contributes to an increased quantum yield. • The monitoring capability of optical signal is expanded via this simple strategy. Rapid on-site detection of antibiotics such as tetracycline (TC) is crucial for understanding their elusive environmental fate. Fluorescence-based strategies are promising owing to their sensitivity and ease of use. This study demonstrates that Al3+–TC coordination significantly enhances the intrinsic fluorescence of TC at excitation/emission wavelengths of 395/490 and 270/490 nm. The fluorescence emission intensity is proportional to the TC concentration between 0.005 and 7.5 μmol/L TC, which increases the detection sensitivity by 40 times compared with the commonly used absorption signals. Density functional theory calculations, when combined with the independent gradient model, indicate that the six-membered chelate ring in the octahedral Al3+–TC complex restricts molecular motion, along with two intramolecular hydrogen bonds formed between TC and water ligands. These factors lead to a narrowing of the energy gap between the highest occupied and lowest unoccupied molecular orbitals upon complexation with Al3+. Consequently, the enhanced molecular rigidity and facilitated electron transfer result in a significant increase in the fluorescence quantum yield. This captivating fluorescence response significantly enhances the proficiency of optical signals in detecting TC, thereby enriching future environmental monitoring systems with greater diversity and adaptability. [ABSTRACT FROM AUTHOR]

Published
2024
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