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Hong JK, Lee TK, Kim I, Park S. Determinants of microbial colonization on microplastics through wastewater treatment processes: The role of polymer type and sequential treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 914:170072. [PMID: 38218474 DOI: 10.1016/j.scitotenv.2024.170072] [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: 11/13/2023] [Revised: 12/27/2023] [Accepted: 01/08/2024] [Indexed: 01/15/2024]
Abstract
This study examines the microbial colonization characteristics of microplastics (MPs) in wastewater treatment plants (WWTPs), focusing on polymer types (High-Density Polyethylene (HDPE) and Polyethylene Terephthalate (PET)) and various stages of wastewater treatments. Through individual and sequential deployment approaches, the research aimed to identify the determinants of bacterial colonization on MPs, whether they were introduced at each stage of treatment individually or in sequence from primary to tertiary stages. The study revealed that the stage of wastewater treatment profoundly influenced bacterial colonization on the polymer types MPs, with bacterial attachment being largely niche-specific. HDPE showed increased sensitivity to wastewater composition, leading to selective biofilm formation. For instance, in HDPE, Firmicutes accounted for 25.1 ± 0.04 % during primary treatment, while Alphaproteobacteria increased significantly in the tertiary treatment to 19.8 ± 0.1 %. Conversely, PET exhibited a stochastic pattern of bacterial colonization due to differences in surface hydrophilicity. Additionally, in sequential deployments, a notable shift towards stochastic bacterial attachment on MPs, particularly with HDPE was observed. The Shannon diversity values for MP biofilms were consistently higher than those for wastewater across all stages, with PET showing an increase in diversity in sequential deployments (Shannon diversity: 5.01 ± 0.03 for tertiary stage). These findings highlight the critical role of MPs as carriers of diverse bacteria, emphasizing the necessity for strategies to mitigate their impact in WWTPs. This study presents a significant advancement in our understanding of the interactions between MPs and microbial populations in WWTP environments.
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Affiliation(s)
- Jin-Kyung Hong
- Department of Environmental and Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Tae Kwon Lee
- Department of Environmental and Energy Engineering, Yonsei University, Wonju 26493, Republic of Korea
| | - Ilho Kim
- Department of Environmental research, Korea Institute of Civil engineering and building Technology (KICT), Gyeonggi-Do 10223, Republic of Korea; Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Saerom Park
- Department of Environmental research, Korea Institute of Civil engineering and building Technology (KICT), Gyeonggi-Do 10223, Republic of Korea; Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea.
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Sun L, Yang C, Wang H, Jin X, Li X, Liu X, Zhu P, Dong C. Bio-based alginate and Si-, P- and N-containing compounds cooperate toward flame-retardant modification of polyester fabrics. Int J Biol Macromol 2024; 259:129121. [PMID: 38159694 DOI: 10.1016/j.ijbiomac.2023.129121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 12/18/2023] [Accepted: 12/27/2023] [Indexed: 01/03/2024]
Abstract
Imparting flame retardancy to polyester fabrics is still a pressing issue for the textile industry. To this end, a composite coating was developed by phosphite, pentamethyldisiloxane, urea and sodium alginate, and then applied together with calcium chloride to prepare flame-retardant polyester fabrics. The optimized polyester fabrics named PF-HUSC exhibited a rough surface with P, Si, N and Ca element distributions, as observed by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). Flame retardancy evaluations showed that the damaged length of PF-HUSC with a limiting oxygen index (LOI) value of 35.3 ± 0.3 % was reduced from the contrastive 17.6 ± 0.4 cm to 4.6 ± 0.2 cm after vertical burning test. Thermogravimetric (TG) test confirmed that PF-HUSC retained a char residue as high as 35.1 % at 700 °C. Cone calorimetry test displayed that the total heat release (THR) and total smoke production (TSP) values of PF-HUSC were reduced to 3.1 MJ/m2 and 1.1 m2, respectively, as compared to those of pure polyester fabrics. More importantly, PF-HUSC still exhibited higher LOI value than that of pure polyester fabrics after 25 washing cycles. Hence, the coating scheme is considered as a new method to expand the preparation of flame-retardant polyester fabrics.
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Affiliation(s)
- Ling Sun
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Chenghao Yang
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Huixin Wang
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Xin Jin
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Xu Li
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Xiangji Liu
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Ping Zhu
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China
| | - Chaohong Dong
- College of Textile and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Functional Textiles and Advanced Materials, Qingdao University, Qingdao 266071, PR China.
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