聚乳酸塑料在淡水沉积物中的降解过程

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Abstract In order to investigate the degradation process of commercial polylactic acid (PLA) plastics in freshwater sediments, a laboratory sediment system was established and the alternation in surface property, the attached biofilm and the microorganism communities on biodegradable plastic bag (PLAB), plastic straw (PLAS) and plastic cup (PLAC), with PLA as the main component, were identified. The results showed that the surface of plastics became rougher after 180days incubation in sediment, and PLAB with numerous protrusions, cracks and holes on the surface exhibited a mass loss (7.30%), showing the highest degree of degradation. Meanwhile, the infrared spectrum of PLAB changed significantly, with increased peak intensities of characteristic peaks such as C=O and C-O as well as a 13.65% increase in carbonyl index. The XPS spectra indicated that the O/C value of PLAB and PLAS were increased by 13.89% and 5.17%, respectively. The relative content of RO-C=O in the three plastics were reduced, indicating that all the studied plastics underwent degradation. At the end of the experiment, the surface of plastics was colonized by PLA degrading bacteria (Pseudomonas) and Desulfobacterota which may drive the degradation of PLA. PLAB had the strongest fluorescence intensity of mature biofilm, and its biofilm biomass in surface sediment was significantly higher than that of control (P<0.05). PLAB favored the formation of biofilm and the growth of the surrounding microbes, which may be attributed from its roughest surface. In addition, as components of PLAB, poly (butyleneadipate-co-terephthalate) (PBAT) displayed higher hydrolysis rate, which may be responsible for its most obvious degradation among the three plastics. Moreover, PLA plastics increased the microbial diversity in surface sediment and changed the relative abundance of dominant phyla, and may affect element cycles.

Key words： polylactic acid plastic degradation biofilm sediment

Received: 15 April 2024

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X524

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	FENG Qin-shuang
	ZHANG Li-xue
	TANG Bing-ran
	HE Qiang
	LI Hong

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FENG Qin-shuang,ZHANG Li-xue,TANG Bing-ran等. Degradation process of polylactic acid plastics in freshwater sediments[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6228-6240.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6228

[1] Al Hosni A S, Pittman J K, Robson G D. Microbial degradation of four biodegradable polymers in soil and compost demonstrating polycaprolactone as an ideal compostable plastic [J]. Waste Management, 2019,97:105-114.
[2] Luo H, Liu C, He D, et al. Environmental behaviors of microplastics in aquatic systems: A systematic review on degradation, adsorption, toxicity and biofilm under aging conditions [J]. Journal of Hazardous Materials, 2022,423(Pt A):126915.
[3] Bhagwat G, Tran T K A, Lamb D, et al. Biofilms enhance the adsorption of toxic contaminants on plastic microfibers under environmentally relevant conditions [J]. Environmental Science & Technology, 2021,55(13):8877-8887.
[4] Cazaudehore G, Guyoneaud R, Evon P, et al. Can anaerobic digestion be a suitable end-of-life scenario for biodegradable plastics? A critical review of the current situation, hurdles, and challenges [J]. Biotechnology Advances, 2022,56:107916.
[5] Bhatt P, Pathak V M, Bagheri A R, et al. Microplastic contaminants in the aqueous environment, fate, toxicity consequences, and remediation strategies [J]. Environmental Research, 2021,200:111762.
[6] 肖娜,王艳华,刘锐涵,等.可生物降解聚乳酸塑料产生二次微塑料的行为特征 [J]. 环境化学, 2025,44(1):1-13. Xiao N, Wang Y H, Liu R H, et al. The behavior characteristics of secondary microplastics from biodegradable polylactic acid [J]. Environmental Chemistry, 2025,44(1):1-13.
[7] Sanz-Lázaro C, Casado-Coy N, Beltrán-Sanahuja A. Biodegradable plastics can alter carbon and nitrogen cycles to a greater extent than conventional plastics in marine sediment [J]. Science of the Total Environment, 2021,756:143978.
[8] 金琰,蔡凡凡,王立功,等.生物可降解塑料在不同环境条件下的降解研究进展 [J]. 生物工程学报, 2022,38(5):1784-1808. Jin Y, Cai F F, Wang L G, et al. Advance in the degradation of biodegradable plastics in different environments [J]. Chinese Journal of Biotechnology, 2022,38(5):1784-1808.
[9] Qi X, Ren Y, Wang X. New advances in the biodegradation of poly(lactic) acid [J]. International Biodeterioration & Biodegradation, 2017,117:215-223.
[10] Liu H, Jiao Q, Pan T, et al. Aging behavior of biodegradable polylactic acid microplastics accelerated by UV/H₂O₂processes [J]. Chemosphere, 2023,337:139360.
[11] Swetha T A, Ananthi V, Bora A, et al. A review on biodegradable polylactic acid (PLA) production from fermentative food waste—Its applications and degradation [J]. International Journal of Biological Macromolecules, 2023,234:123703.
[12] Rebelo R C, Gonçalves L P C, Fonseca A C, et al. Increased degradation of PLA/PBAT blends with organic acids and derivatives in outdoor weathering and marine environment [J]. Polymer, 2022, 256:125223.
[13] 谢彬,白茸茸,孙华山,等.聚乳酸塑料合成、生物降解及其废弃物处置的研究进展 [J]. 生物工程学报, 2023,39(5):1912-1929. Xie B, Bai R R, Sun H S, et al. Synthesis, biodegradation and waste disposal of polylactic acid plastics: a review [J]. Chinese Journal of Biotechnology, 2023,39(5):1912-1929.
[14] Lucas N, Bienaime C, Belloy C, et al. Polymer biodegradation: mechanisms and estimation techniques [J]. Chemosphere, 2008,73(4): 429-442.
[15] 张李婷,张博,许维东,等.聚乙烯塑料生物降解研究进展 [J]. 生物工程学报, 2023,39(5):1949-1962. Zhang L T, Zhang B, Xu W D, et al. Polyethylene biodegradation: current status and perspectives [J]. Chinese Journal of Biotechnology, 2023,39(5):1949-1962.
[16] Lv S, Zhang Y, Gu J, et al. Physicochemical evolutions of starch/poly (lactic acid) composite biodegraded in real soil [J]. Journal of Environmental Management, 2018,228:223-231.
[17] Nie Z, Wang L, Lin Y, et al. Effects of polylactic acid (PLA) and polybutylene adipate-co-terephthalate (PBAT) biodegradable microplastics on the abundance and diversity of denitrifying and anammox bacteria in freshwater sediment [J]. Environmental Pollution, 2022,315:120343.
[18] Peng B Y, Chen Z, Chen J, et al. Biodegradation of polylactic acid by yellow mealworms (larvae of Tenebrio molitor) via resource recovery: A sustainable approach for waste management [J]. Journal of Hazardous Materials, 2021,416:125803.
[19] Chen H, Wang Y, Sun X, et al. Mixing effect of polylactic acid microplastic and straw residue on soil property and ecological function [J]. Chemosphere, 2020,243:125271.
[20] 郑涵月,孙姣霞,向红,等.生物可降解塑料PBAT/PLA在典型非生物降解环境下的降解 [J]. 中国环境科学, 2023,43(8):4247-4254. Zheng H Y, Sun J X, Xiang H, et al. Degradation of biodegradable plastic PBAT/PLA under typical non-biodegradable environment [J]. China Environmental Science, 2023,43(8):4247-4254.
[21] Liao J, Chen Q. Biodegradable plastics in the air and soil environment: Low degradation rate and high microplastics formation [J]. Journal of Hazardous Materials, 2021,418:126329.
[22] Bagheri A R, Laforsch C, Greiner A, et al. Fate of so-called biodegradable polymers in seawater and freshwater [J]. Global Challenges, 2017,1(4):1700048.
[23] Narancic T, Verstichel S, Reddy Chaganti S, et al. Biodegradable plastic blends create new possibilities for end-of-life management of plastics but they are not a panacea for plastic pollution [J]. Environmental Science & Technology, 2018,52(18):10441-10452.
[24] Sintim H Y, Bary A I, Hayes D G, et al. In situ degradation of biodegradable plastic mulch films in compost and agricultural soils [J]. Science of the Total Environment, 2020,727:138668.
[25] Griffin-LaHue D, Ghimire S, Yu Y, et al. In-field degradation of soil-biodegradable plastic mulch films in a Mediterranean climate [J]. Science of the Total Environment, 2022,806(Pt 1):150238.
[26] Blettler M C M, Ulla M A, Rabuffetti A P, et al. Plastic pollution in freshwater ecosystems: macro-, meso-, and microplastic debris in a floodplain lake [J]. Environmental Monitoring and Assessment, 2017,189(11):581.
[27] Sun Y, Duan C, Cao N, et al. Biodegradable and conventional microplastics exhibit distinct microbiome, functionality, and metabolome changes in soil [J]. Journal of Hazardous Materials, 2022,424(Pt A):127282.
[28] Deng H, Zhang Y, Li D, et al. Mangrove degradation retarded microplastics weathering and affected metabolic activities of microplastics-associated microbes [J]. Journal of Hazardous Materials, 2023,445:130535.
[29] Li C, Sun H, Shi Y, et al. Polyethylene and poly (butyleneadipate-co-terephthalate)-based biodegradable microplastics modulate the bioavailability and speciation of Cd and As in soil: Insights into transformation mechanisms [J]. Journal of Hazardous Materials, 2023, 445:130638.
[30] Tu C, Chen T, Zhou Q, et al. Biofilm formation and its influences on the properties of microplastics as affected by exposure time and depth in the seawater [J]. Science of the Total Environment, 2020,734: 139237.
[31] Huang Y, Li W, Gao J, et al. Effect of microplastics on ecosystem functioning: Microbial nitrogen removal mediated by benthic invertebrates [J]. Science of the Total Environment, 2021,754:142133.
[32] Liu Y, Dedieu K, Sánchez-Pérez J-M, et al. Role of biodiversity in the biogeochemical processes at the water-sediment interface of macroporous river bed: An experimental approach [J]. Ecological Engineering, 2017,103:385-393.
[33] Wang Y, Hu T, Zhang W, et al. Biodegradation of polylactic acid by a mesophilic bacteria Bacillus safensis [J]. Chemosphere, 2023,318: 137991.
[34] Meng K, Teng Y, Ren W, et al. Degradation of commercial biodegradable plastics and temporal dynamics of associated bacterial communities in soils: A microcosm study [J]. Science of the Total Environment, 2023,865:161207.
[35] Wei X F, Bohlen M, Lindblad C, et al. Microplastics generated from a biodegradable plastic in freshwater and seawater [J]. Water Research, 2021,198:117123.
[36] 白利华,梁思嘉,董若辰,等.可生物降解微塑料的自然光解老化 [J]. 环境化学, 2022,41(12):3831-3839. Bai L H, Liang S J, Dong R C, et al. Natural photo-aging of biodegradable microplastics [J]. Environmental Chemistry, 2022, 41(12):3831-3839.
[37] 刘加强,蒋园园,杨杨阳,等.聚乳酸微塑料对大型溞的毒性效应 [J]. 中国环境科学, 2023,43(08):4343-4352. Liu J Q, Jiang Y Y, Yang Y Y, et al. Toxic effects of polylactic acid microplastics to Daphnia magna [J]. China Environmental Science, 2023,43(8):4343-4352.
[38] Syranidou E, Karkanorachaki K, Barouta D, et al. Relationship between the carbonyl index (CI) and fragmentation of polyolefin plastics during aging [J]. Environmental Science & Technology, 2023, 57(21):8130-8138.
[39] Chen H, Hu X, Song W, et al. Effect of pistachio shell as a carbon source to regulate C/N on simultaneous removal of nitrogen and phosphorus from wastewater [J]. Bioresource Technology, 2023,367: 128234.
[40] Wu J, Bai Y, Lu B, et al. Silver sulfide nanoparticles reduce nitrous oxide emissions by inhibiting denitrification in the earthworm gut [J]. Environmental Science & Technology, 2020,54(18):11146-11154.
[41] Bubpachat T, Sombatsompop N, Prapagdee B. Isolation and role of polylactic acid-degrading bacteria on degrading enzymes productions and PLA biodegradability at mesophilic conditions [J]. Polymer Degradation and Stability, 2018,152:75-85.
[42] Gerritse J, Leslie H A, de Tender C A, et al. Fragmentation of plastic objects in a laboratory seawater microcosm [J]. Scientific Reports, 2020,10(1):10945.
[43] Hao Y, Min J, Ju S, et al. Possible hazards from biodegradation of soil plastic mulch: Increases in microplastics and CO₂ emissions [J]. Journal of Hazardous Materials, 2024,467:133680.
[44] Weinstein J E, Dekle J L, Leads R R, et al. Degradation of bio-based and biodegradable plastics in a salt marsh habitat: Another potential source of microplastics in coastal waters [J]. Marine Pollution Bulletin, 2020,160:111518.
[45] Bao R, Pu J, Xie C, et al. Aging of biodegradable blended plastic generates microplastics and attached bacterial communities in air and aqueous environments [J]. Journal of Hazardous Materials, 2022,434: 128891.
[46] 范秀磊,常卓恒,邹晔锋,等.可降解微塑料对铜和锌离子的吸附解吸特性 [J]. 中国环境科学, 2021,41(5):2141-2150. Fan X L, Chang Z H, Zou Y F, et al. Adsorption and desorption properties of degradable microplastic for Cu²⁺ and Zn²⁺ [J]. China Environmental Science, 2021,41(5):2141-2150.
[47] Wang Z, Ding J, Song X, et al. Aging of poly (lactic acid)/poly (butylene adipate-co-terephthalate) blends under different conditions: Environmental concerns on biodegradable plastic [J]. Science of the Total Environment, 2023,855:158921.
[48] 张洪瑜,高嘉蔚,陈思宝,等.共混塑料在海水中的光降解及海洋环境风险 [J]. 环境科学, 2023,44(11):6172-6180. Zhang H Y, Gao J W, Chen S B, et al. Photodegradation of plastic blends in seawater and its risk to the marine environment [J]. Environmental Science, 2023,44(11):6172-6180.
[49] Yu Y, Zhu B, Ding Y, et al. Impacts of poly(lactic acid) microplastics on organic compound leaching and heavy metal distribution during hydrothermal treatment of sludge [J]. Science of the Total Environment, 2023,901:166012.
[50] Omura T, Isobe N, Miura T, et al. Microbial decomposition of biodegradable plastics on the deep-sea floor [J]. Nature Communications, 2024,15(1):568.
[51] Wang J, Peng C, Li H, et al. The impact of microplastic-microbe interactions on animal health and biogeochemical cycles: A mini-review [J]. Science of the Total Environment, 2021,773:145697.
[52] Li K, Xu L, Bai X, et al. Differential fungal assemblages and functions between the plastisphere of biodegradable and conventional microplastics in farmland [J]. Science of the Total Environment, 2024,906:167478.
[53] Li Z, Feng C, Lei J, et al. Farmland microhabitat mediated by a residual microplastic film: Microbial communities and function [J]. Environmental Science & Technology, 2024,58(8):3654-3664.
[54] Hu X, Gu H, Sun X, et al. Distinct influence of conventional and biodegradable microplastics on microbe-driving nitrogen cycling processes in soils and plastispheres as evaluated by metagenomic analysis [J]. Journal of Hazardous Materials, 2023,451:131097.