Towards robust partial nitrification in low-ammonia wastewater: Electrospinning nanofiber composite-enhanced hydrogel beads immobilized comammox Nitrospira

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

Bioresource Technology Pub Date : 2025-04-13 DOI:10.1016/j.biortech.2025.132541

Peng Tang , Liangang Hou , Meiling Yin , Feng Huang , Zhengwei Pan , Tianhao Shi , Jun Li , Yuhan Zhu , Xin Zhang , Peng Gao

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Abstract

Stable partial nitrification (PN) in low-ammonia wastewater has been a critical challenge, but comammox Nitrospira shows great potential in PN systems due to unique physiological characteristics. Polyvinyl alcohol/sodium alginate electrospinning nanofiber (PVA/SA-EN) and polyvinylidene fluoride EN (PVDF-EN) were used to construct EN hydrogel beads (ENHB) with sandwich and core–shell structures, respectively. Comammox HB (cHB) and three types of comammox ENHB (cENHB) were assembled by immobilizing comammox sludge and operated for 60 days in low-ammonia wastewater. Results showed a significant correlation between PN performance, HB pore structure, and comammox Nitrospira abundance. With superior pore structure and mechanical strength, PVA/SA-PVDF-cENHB achieved a nitrite accumulation rate of 55.08 %, indicating enhanced PN performance. The contribution of comammox Nitrospira to PN was 73.19 %. Its abundance in PVA/SA-PVDF-cENHB was 5.56 × 10⁶ copies/(g sludge), 1.16–1.95-fold higher than the other three HB. Nanofiber composite-enhanced hydrogel immobilizes comammox Nitrospira provides new ideas for achieving robust PN in low-ammonia wastewater.

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低氨废水的强力部分硝化作用：静电纺丝纳米纤维复合材料增强水凝胶珠固定化comammox硝化螺旋菌

低氨废水中稳定的部分硝化（PN）一直是一个关键的挑战，但comammox硝化螺由于其独特的生理特性在PN系统中显示出巨大的潜力。采用聚乙烯醇/海藻酸钠静电纺丝纳米纤维（PVA/SA-EN）和聚偏氟乙烯EN （PVDF-EN）分别制备了夹心结构和核壳结构的EN水凝胶珠（ENHB）。通过固定化Comammox污泥组装Comammox HB （cHB）和3种类型的Comammox ENHB (cENHB)，并在低氨废水中运行60 d。结果显示PN性能、HB孔结构与comammox硝化螺旋菌丰度之间存在显著相关性。PVA/SA-PVDF-cENHB具有优越的孔隙结构和机械强度，亚硝酸盐积累率达到55.08%，表明PN性能得到增强。硝螺旋科莫司对PN的贡献率为73.19%。其在PVA/SA-PVDF-cENHB中的丰度为5.56 × 10⁶拷贝/（g污泥），比其他3种HB高1.16 - 1.95倍。纳米纤维复合材料增强水凝胶固定化comammox硝化螺旋菌为实现低氨废水稳健PN提供了新的思路。

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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.