Valorization of aromatic hydrocarbons into polyhydroxyalkanoates: advances towards sustainable waste gas treatment

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-07-17 DOI:10.1016/j.biortech.2025.132991

Nicolás Díaz-Moreno, Cecilia Lobos, Andrea Carvajal, Ignacio Poblete, Sara Cantera, Raquel Lebrero

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Abstract

Benzene, toluene, ethylbenzene, xylene and styrene (BTEXS) are priority gaseous pollutants due to their widespread release and health risks. This study demonstrates an efficient BTEXS bioconversion process into polyhydroxyalkanoates (PHA) using a specialized mixed microbial culture dominated by Pseudonocardia and Rhodococcus. The consortium achieved simultaneous degradation rates of 15.1 ± 3.9 g m−3h−1 for toluene and 17.6 ± 5.7 g m−3h−1 for ethylbenzene, with removal efficiencies over 90 %. The operating strategy promoted PHA accumulation up to 21.4 % gPHA gDCW−1. A two-step process was successfully implemented consisting of an initial reactor for biomass growth followed by a second reactor under nitrogen deprivation. PHA analysis revealed the synthesis of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymer with a dynamic increase in 3-hydroxyvalerate content under prolonged nitrogen starvation. Metagenomics provided insights into the microbial networks and metabolic pathways involved in the process. This research offers a sustainable solution for mitigating BTEXS pollution while producing valuable bioplastics

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芳烃活化成聚羟基烷酸酯：可持续废气处理的研究进展

苯、甲苯、乙苯、二甲苯和苯乙烯（BTEXS）因其广泛释放和健康风险而成为优先气态污染物。本研究展示了利用假心球菌和红球菌为主的特殊混合微生物培养，将BTEXS高效转化为聚羟基烷酸酯（PHA）的过程。该联盟对甲苯的同时降解率为15.1 ± 3.9 g m−3h−1，对乙苯的同时降解率为17.6 ± 5.7 g m−3h−1，去除率超过90 %。该操作策略可促进PHA积累达到21.4% % gPHA gDCW−1。成功地实施了两步工艺，包括一个用于生物质生长的初始反应器，然后是氮剥夺下的第二个反应器。PHA分析表明，在长时间的氮饥饿条件下，聚（3-羟基丁酸酯-co-3-羟基戊酸酯）共聚物的合成与3-羟基戊酸酯含量的动态增加。宏基因组学提供了对这一过程中涉及的微生物网络和代谢途径的见解。这项研究提供了一种可持续的解决方案，可以在生产有价值的生物塑料的同时减轻btex污染

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.