Environmental Technology & Innovation最新文献_第3页

Assessment of the tritium analysis performance of a nonylphenol-ethoxylate-free liquid scintillator by interlaboratory comparison 无壬基酚-乙氧基酸液体闪烁体氚分析性能的实验室间比较评价

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2025-12-02 DOI: 10.1016/j.eti.2025.104666

Marielle Crozet , Véronique Labed , Céline Augeray , Audrey Bacchetta , Lionel Bec-Espitalier , Nicolas Baglan , Eric Bohaud , Giacomo Canciani , Sabine Charbouillot , Christèle Colin , Coryse Combes , Théo Cordara , Benoît Daniel , Nicolas Debain , Natacha Einaudi , Sandrine Fleury , Kevin Galliez , Claire Gégout , Héloïse Gervot , Aurélie Gollion , Cédric Rivier

With a view to using liquid scintillators compliant with the REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulations, some laboratories have expressed an interest in testing the ProSafe LT+ , a liquid scintillator without nonylphenol-ethoxylates (NPE). In order to evaluate the impact of using this new liquid on the analysis results, the CETAMA consortium organised two interlaboratory comparisons. Two ranges of tritium activity were selected to meet the needs of environmental and waste monitoring. 23 laboratories took part in these exercises, comparing results obtained with Prosafe LT+ to those obtained with NPE-containing liquid scinitllators. From the results it was seen that the background and the background noise obtained with the nonylphenol-ethoxylates-free liquid scintillator are not significantly different from that of the usual liquid scintillator, whether for the waste or environmental domain, over short (15 min) or long (200 min) counting times. Furthermore, the decision threshold and the detection limit values estimated with ProSafe LT+ were no different from those of usual scintillators. However, for the measurement of samples, and particularly for samples with a tritium activity above 15 Bq/kg, the ProSafe LT+ presented a reduced measurement quality compared to the nonylphenol-ethoxylates-containing LS i.e. the measurement uncertainty obtained with ProSafe LT+ is systematically higher. In light of the results obtained through this study, the authors recommend the use of the ProSafe LT+ with the proviso that the deterioration in measurement uncertainty be taken into account and found to be compatible with a laboratory’s individual needs.

为了使用符合REACH（化学品注册、评估、授权和限制）法规的液体闪烁体，一些实验室表示有兴趣测试ProSafe LT+ ，这是一种不含壬基苯酚-乙氧基醚（NPE）的液体闪烁体。为了评估使用这种新液体对分析结果的影响，CETAMA联盟组织了两次实验室间比较。为了满足环境和废物监测的需要，选择了两个氚活度范围。23个实验室参加了这些演习，比较了使用Prosafe LT+ 获得的结果与使用含有npe的液体闪烁器获得的结果。结果表明，在短计数时间（15 min）和长计数时间（200 min）内，无壬基酚-乙氧基酸酯液体闪烁体的背景和背景噪声与普通液体闪烁体的背景和背景噪声没有显著差异，无论是在废物领域还是在环境领域。此外，ProSafe LT+ 估计的判断阈值和检测极限值与通常的闪烁体没有什么不同。然而，对于样品的测量，特别是对于氚活性高于15 Bq/kg的样品，与含有壬基酚-乙氧基酸盐的LS相比，ProSafe LT+ 的测量质量降低，即使用ProSafe LT+ 获得的测量不确定度更高。鉴于通过这项研究获得的结果，作者建议使用ProSafe LT+ ，附带条件是要考虑到测量不确定度的恶化，并发现与实验室的个人需求相兼容。

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引用次数: 0

Direct nanofiltration treatment using flat-sheet membrane modules reconfigured from spiral-wound elements 直接纳滤处理使用由螺旋缠绕元件重新配置的平板膜模块

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.eti.2025.104678

Sandrine Boivin , Tetsuro Ueyama , Norika Tanaka , Tatsumi Shimono , Naoki Ohkuma , Kyoungsoo Park , Takahiro Fujioka

Direct nanofiltration (NF) treatment without pretreatment has attracted attention for achieving low-energy advanced drinking water treatment in drinking water applications. However, the validity of submerged NF systems for large-scale modules and variable feed water quality remains unexplored. This study aimed to assess the viability of pump-operated and gravity-driven membrane (GDM) filtration of lake water without pretreatment using NF membrane modules reconfigured from commercially available NF membrane elements typically suited for pressurized operation. The permeate flux of the pump-operated NF system gradually declined from 2.3 to 1.2 L/m²h at a feed temperature of 7–11°C until 12 d; thereafter, the permeate flux remained stable until 36 d. Cleaning the membrane surface by sponge wiping achieved near-full recovery of the permeance. The removal of dissolved organic matter and conductivity were relatively low, at 30–50 % and 10–30 % respectively. The specific energy consumption (SEC) of the pump-operated NF system could be as low as 116 Wh/m³, based on the pilot-scale tests. In contrast, the permeate flux of GDM filtration using the reconfigured NF membrane modules remained constant at approximately 0.28–0.37 L/m²h at a feed temperature of 5–22°C for over 78 d despite the limited water head available. The separation performance of GDM filtration was comparable to that of the pump-operated NF system, while the removal of conductivity (ions) was negligible. Despite the limitations of permeance and separation performance, both pump-operated and gravity-driven systems with reconfigured NF membrane modules have the potential to achieve low-energy and decentralized water supply systems.

不经预处理的直接纳滤处理已成为实现低能耗高级饮用水处理的热点。然而，淹没式纳滤系统对于大型模块和可变给水水质的有效性仍未得到探索。本研究旨在评估泵操作和重力驱动膜（GDM）过滤湖水的可行性，而不需要预处理，使用的是由市售的通常适用于加压操作的纳滤膜元件重新配置的纳滤膜模块。在进料温度为7 ~ 11℃时，泵控NF系统的渗透通量从2.3逐渐下降到1.2 L/m2h，直至12 d；此后，渗透通量保持稳定，直至36 d。通过海绵擦拭清洁膜表面，几乎完全恢复了渗透通量。溶解有机物的去除率和电导率相对较低，分别为30-50 %和10-30 %。根据中试结果，泵控NF系统的比能耗（SEC）可低至116 Wh/m3。相比之下，在进料温度为5-22°C的情况下，尽管可用水头有限，但使用重新配置的NF膜组件的GDM过滤的渗透通量仍保持在约0.28-0.37 L/m2h，持续78 d以上。GDM过滤的分离性能与泵操作的NF系统相当，而电导率（离子）的去除可以忽略不计。尽管存在渗透性能和分离性能的限制，但泵操作系统和重力驱动系统都具有重新配置NF膜模块的潜力，可以实现低能耗和分散式供水系统。

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引用次数: 0

Integrated low-temperature washing and drying for sustainable hygiene of domestic laundry 集低温洗涤和烘干于一体，实现家庭洗衣的可持续卫生

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2026-01-23 DOI: 10.1016/j.eti.2026.104763

Rok Fink , Blanka Vozel , Manca Lunder , Nina Čuk , Brigita Tomšič

Low-temperature laundering is promoted to reduce the environmental impact of domestic textile care; however, washing at ≤ 40 °C is insufficient for hygienic decontamination, rendering the drying stage critical, as microbial survival strongly depends on moisture availability and drying conditions. This study systematically investigates the antimicrobial efficacy of low-temperature washing combined with different drying methods under controlled, household-relevant conditions, and directly links hygiene performance to environmental impact using life cycle assessment (LCA). Cotton carriers inoculated with representative bioindicators were washed at 30 °C using a commercial detergent and subsequently dried by high- and low-temperature tumble drying, controlled indoor air drying, and simulated outdoor solar exposure (Xenotest). Low-temperature washing alone resulted in limited microbial reduction, whereas drying led to substantial additional inactivation. Both high- and low-temperature tumble drying eliminated most microorganisms (>7 log CFU cm⁻²), while simulated indoor air drying achieved significant reductions (∼6 log CFU cm⁻²), indicating that moisture reduction is a dominant mechanism of microbial inactivation, even without elevated drying temperatures. In this respect Xenotest treatment was less effective. The LCA showed that drying accounts for more than 50 % of the total environmental impact of the laundering process, with low-temperature tumble drying reducing overall impacts by approximately 20 % compared to high-temperature drying due to lower electricity consumption. By quantitatively linking microbial hygiene outcomes with environmental impacts, this study provides decision-relevant evidence for optimising domestic laundry practices, demonstrating that energy-efficient drying strategies can compensate for the hygienic limitations of low-temperature washing while significantly reducing the environmental footprint of textile care.

提倡低温洗涤，减少家用纺织品护理对环境的影响；然而，≤ 40°C的洗涤不足以实现卫生去污，因此干燥阶段至关重要，因为微生物的存活在很大程度上取决于水分的可用性和干燥条件。本研究系统研究了在可控的家庭相关条件下，低温洗涤结合不同干燥方法的抗菌效果，并使用生命周期评估（LCA）将卫生性能与环境影响直接联系起来。接种了代表性生物指示剂的棉花载体在30°C下使用商业洗涤剂洗涤，随后通过高低温滚筒式干燥、受控室内空气干燥和模拟室外阳光照射（Xenotest）进行干燥。低温洗涤单独导致有限的微生物减少，而干燥导致大量额外的失活。高温和低温滚筒干燥都能消灭大多数微生物（>7 log CFU cm⁻²），而模拟室内空气干燥则能显著减少微生物（~ 6 log CFU cm⁻²），这表明即使没有提高干燥温度，减少水分也是微生物灭活的主要机制。在这方面，Xenotest治疗效果较差。LCA表明，干燥占洗涤过程总环境影响的50% %以上，与高温干燥相比，由于电力消耗较低，低温滚筒式干燥减少了约20% %的总体影响。通过定量地将微生物卫生结果与环境影响联系起来，本研究为优化家庭洗衣实践提供了决策相关的证据，表明节能干燥策略可以弥补低温洗涤的卫生限制，同时显着减少纺织品护理的环境足迹。

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引用次数: 0

Hydrothermal synthesis of FeOF as an activator of peroxymonosulfate for the degradation of lomefloxacin in water 水热合成FeOF作为过氧单硫酸盐活化剂降解水中洛美沙星

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2026-01-18 DOI: 10.1016/j.eti.2026.104760

Haichen Cui , Zheng Wang , Yannan Jia , Weikun Song , Xue Wang , Lu Li , Zhendong Liu , Binbin Wu , Weixiao Gong , Wanting Feng , Yuanxiang Shan , Junchi Zhang

In this study, FeOF was successfully synthesized by first preparing the precursor FeSiF₆·6 H₂O from iron powder, followed by a hydrothermal reaction at 200°C for 10 h using a thoroughly stirred mixture of the precursor and n-propanol. The synthesized FeOF was employed as an activator of peroxymonosulfate (PMS) for the degradation of lomefloxacin (LMF). Experimental results demonstrate that the FeOF/PMS system not only achieved 74.6 % LMF degradation but also maintained high degradation efficiency after five consecutive cycles. More importantly, the system significantly reduced the biotoxicity of the reaction intermediates, thereby offering a promising new strategy for addressing antibiotic contamination.

在本研究中，首先以铁粉为原料制备前驱体FeSiF6·6 H2O，然后将前驱体与正丙醇充分搅拌，在200℃下水热反应10 h，成功地合成了FeOF。将合成的FeOF用作过氧单硫酸酯（PMS）降解洛美沙星（LMF）的活化剂。实验结果表明，FeOF/PMS系统在连续5次循环后，LMF降解率达到74.6 %，并保持了较高的降解效率。更重要的是，该系统显著降低了反应中间体的生物毒性，从而为解决抗生素污染提供了一个有希望的新策略。

引用次数: 0

Removal of microbial and genetic contaminants from livestock wastewater using chemically enhanced primary treatment for agricultural irrigation 农业灌溉用化学强化一级处理去除牲畜废水中的微生物和遗传污染物

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2026-01-15 DOI: 10.1016/j.eti.2026.104757

Hyun Min Jang , Eunsung Kan

Irrigation water from the livestock farm serves as a key pathway to disseminate microbial and genetic contaminants. In this study, the applicability of chemically enhanced primary treatment (CEPT) to lagoon-derived dairy farm wastewater was evaluated for the removal of microbial and genetic contaminants (i.e., antibiotic resistance genes (ARGs), and antibiotic resistance bacteria (ARB)), as well as conventional pollutants. Significant removal of both intracellular and extracellular ARGs was achieved at FeCl₃ dosages above 3 g/L during CEPT treatment. Furthermore, no total coliforms, E. coli, or cultivable ARB were detected following CEPT treatment at FeCl₃ dosages above 3 g/L. Considering these findings, CEPT is expected to mitigate the adverse effects of microbial and genetic contaminants resulting from agricultural irrigation. Future efforts should focus on optimizing CEPT to enhance its economic efficiency across different conditions.

来自畜牧场的灌溉水是传播微生物和遗传污染物的关键途径。本研究评估了化学强化一级处理（CEPT）对泻湖奶牛场废水去除微生物和遗传污染物（即抗生素抗性基因（ARGs）和抗生素抗性细菌（ARB））以及常规污染物的适用性。在CEPT处理期间，FeCl₃的剂量大于3 g/L时，细胞内和细胞外的ARGs都得到了显著的去除。此外，在FeCl₃剂量大于3 g/L的CEPT处理下，没有检测到总大肠菌群、大肠杆菌或可培养的ARB。考虑到这些发现，CEPT有望减轻农业灌溉造成的微生物和遗传污染物的不利影响。未来的工作重点是优化CEPT，以提高其在不同条件下的经济效率。

引用次数: 0

Impact of turning frequency on the transformation and bioavailability of nutrient elements and heavy metals in large-scale sheep manure composting on the Qinghai–Tibet Plateau

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2025-12-02 DOI: 10.1016/j.eti.2025.104677

Rui Cai , Rongrong Li , Qingqing Zhou

A comprehensive understanding of the transformation mechanisms of nutrient elements and heavy metals, as well as their bioavailability during composting, is critical to ensuring the safety of compost products and improving their nutritional quality. This study explored the transformation mechanisms of heavy metals, nitrogen, and phosphorus forms in industrial-scale composting of sheep manure on Qinghai-Tibet Plateau (QTP) under three turning frequencies: once every two days (T1), four days (T2), and six days (T3). Results showed that T1 increased the maximum composting temperature by 6.6 °C compared to T3 and increased the humification index by 15.1 %, respectively. T1 increased the contents of available nitrogen and labile phosphorus by 12.1 % and 12.8 %, respectively, enhancing nitrogen and phosphorus availability for plant seedlings. T1 significantly decreased the proportions of exchangeable Pb, Cr, and Mn in the compost products by 13.7 %, 11.8 %, and 17.1 %, respectively (P < 0.05), while significantly increasing the proportions of residual Mn, Cu, Pb, and Cr, thereby reducing plant uptake of these heavy metals. More frequent turning suppressed denitrification while enhancing nitrite ammonification. This contributes to reduced nitrogen loss and enhanced nitrogen availability. Additionally, more frequent turning enhanced organic P mineralization, inorganic P solubilization, and polyphosphate degradation, thereby improving phosphorus bioavailability. Moreover, more frequent turning can influence heavy metal forms by modulating maturity, moisture content, and bacterial communities. These findings provide scientific support for the effective resource utilization of livestock waste on QTP.

全面了解堆肥过程中养分元素和重金属的转化机制及其生物利用度，对保证堆肥产品的安全性和提高堆肥产品的营养品质至关重要。结果表明：与T3相比，T1处理可使最高堆肥温度提高6.6℃，腐殖质化指数提高15.1 %；T1处理使植株速效氮和活性磷含量分别提高了12.1% %和12.8% %，提高了植株幼苗氮素和磷的有效性。T1显著降低了堆肥产物中可交换性Pb、Cr和Mn的比例，分别降低了13.7 %、11.8 %和17.1 % (P <； 0.05)，而显著增加了残留Mn、Cu、Pb和Cr的比例，从而降低了植物对这些重金属的吸收。频繁的转向抑制了反硝化作用，同时增强了亚硝酸盐的氨化作用。这有助于减少氮的损失和提高氮的可用性。此外，更频繁的转向增强了有机磷的矿化、无机磷的增溶和多磷酸盐的降解，从而提高了磷的生物利用度。此外，更频繁的翻转可以通过调节成熟度、水分含量和细菌群落来影响重金属的形态。研究结果为QTP上畜禽废弃物的有效资源化利用提供了科学依据。

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引用次数: 0

Alternate wet‑dry irrigation coupled with magnesium-biochar fertilizer improves carbon sequestration, NH₃ mitigation, and water‑N use efficiency in rice paddies 干湿交替灌溉加上镁-生物炭肥料改善了稻田的碳固存、nh3缓解和水氮利用效率

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2026-01-26 DOI: 10.1016/j.eti.2026.104765

Yanqi Li , Xuanming Wang , Fuzheng Gong , Yu Guan , Qi Wu , Daocai Chi , Nanthi S. Bolan , Kadambot H.M. Siddique

The development of low-carbon, water-efficient rice cultivation systems is crucial for sustainable agriculture. Nevertheless, although alternate wet-dry irrigation (I_AWD) can save water and promote the mineralization of soil organic nitrogen (N), it may reduce soil organic carbon (SOC) sequestration and increase ammonia (NH₃) volatilization. To address this trade-off, a magnesium–modified biochar–based fertilizer (MBF) was applied to optimize biochar’s inherently high C:N ratio while enable controlled nitrogen release. A two-year field split-plot experiment was conducted to evaluate the effects of two irrigation regimes (main plots) and five fertilization practices (subplots) on SOC, soil inorganic N, water–N use efficiency, yield, and NH₃ emissions. Results showed that I_AWD combined with N fertilizer reduction and MBF enhanced stem/leaf-to-grain N translocation through the modulation of crop growth rates, increasing yield and grain N use efficiency (NUE_g). Correlation analysis demonstrated that higher soil NH₄⁺ –N suppressed SOC priming, while reduced NH₄⁺–N during basal fertilization and increased SOC limited NH₃ emissions and improved water use efficiency (WUE). Structural equation modeling indicated NH₃ emissions directly reduced NUE and indirectly affected WUE. Compared with conventional fertilization, the treatment of 25 % N reduction combined with 10 t ha⁻¹ MBF (N_3/4B₂) increased SOC by 14.40 %, optimized NH₄⁺–N distribution (reduction during basal fertilization but enhancement during topdressing periods), reduced NH₃ emissions by 10.78 %, and increased yield by 4.82 % and WUE by 10.86 % (two–year averages). Thus, TOPSIS modeling confirmed I_AWDN_3/4B₂ as a sustainable strategy integrating water-saving, yield stability, carbon sequestration, and NH₃ mitigation.

发展低碳、节水的水稻种植系统对可持续农业至关重要。然而，干湿交替灌溉（IAWD）虽然可以节约水分，促进土壤有机氮(N)的矿化，但可能会减少土壤有机碳（SOC）的固存，增加氨（NH3）的挥发。为了解决这一问题，研究人员使用了镁改性生物炭基肥料（MBF）来优化生物炭固有的高碳氮比，同时控制氮的释放。通过2年田间分块试验，评价了2种灌溉方式（主小区）和5种施肥方式（子小区）对土壤有机碳、土壤无机氮、水氮利用效率、产量和NH3排放的影响。结果表明，IAWD配合减施氮肥和MBF，通过调节作物生长速率，提高产量和籽粒氮素利用效率（NUEg），促进茎/叶-籽粒氮素转运。相关分析表明，较高的土壤NH4+ -N抑制了土壤有机碳的启动，而在基肥过程中降低了土壤NH4+ -N，增加了土壤有机碳，限制了NH3的排放，提高了水分利用效率（WUE）。结构方程模型表明，NH3排放直接降低氮肥利用效率，间接影响氮肥利用效率。与常规施肥相比，25 % N减量处理结合10 t ha - 1 MBF （N3/4B2）增加了14.40 %的有机碳，优化了NH4+ -N的分配（基肥期间减少，补肥期间增加），减少了10.78 %的NH₃排放量，提高了4.82 %的产量和10.86 %的WUE（两年平均值）。因此，TOPSIS模型证实IAWDN3/4B2是一种集节水、产量稳定、固碳和NH3缓解于一体的可持续战略。

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引用次数: 0

Explainable machine learning links organic-matter stress to microbial controls of sedimentary ammonium accumulation in marsh-type shallow lakes 可解释的机器学习将有机质胁迫与沼泽型浅湖沉积铵积累的微生物控制联系起来

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2026-01-27 DOI: 10.1016/j.eti.2026.104787

Ziyang Zhu , Chao Zhang , Shengfang Wen , Baoqing Shan

Shallow lakes with high primary productivity and macrophyte dominance often accumulate organic matter (OM) in sediments, which can promote ammonium (NH₄⁺-N) accumulation and increase the risk of free-ammonia toxicity. However, under high-OM conditions, the microbial functional changes associated with NH₄⁺-N accumulation, as well as their key environmental drivers and threshold windows, remain poorly understood. Here, we investigated Baiyangdian Lake, a representative macrophyte-dominated shallow lake, by integrating high-throughput sequencing, qPCR quantification, and interpretable machine learning (XGBoost–SHAP). The results showed a clear functional divergence under high OM relative to low OM, characterized by enhanced mineralization but suppressed nitrification: ureC increased by 40.63 %, whereas archaeal amoA and bacterial amoA decreased by 94.88 % and 94.30 %, respectively. SHAP further indicated that OM is a core driver of variations in these three functional genes and exhibits threshold-like nonlinear effects: both amoA genes shifted to suppression when OM exceeded 19.62 %/22.27 %, while ureC shifted to promotion when OM exceeded 12.71 % and approached saturation at OM ≈ 17 %. Together, this study reveals distinct threshold regimes in sediment nitrogen functioning associated with NH₄⁺-N buildup, offering quantitative cues to delineate sensitive intervals of internal nitrogen risk and inform targeted management.

初级生产力高、大型植物优势的浅湖往往在沉积物中积累有机质（OM），这可以促进铵（NH₄+ -N）的积累，增加游离氨毒性的风险。然而，在高om条件下，与NH₄⁺-N积累相关的微生物功能变化，以及它们的关键环境驱动因素和阈值窗口，仍然知之甚少。本文采用高通量测序、qPCR定量和可解释机器学习（XGBoost-SHAP）技术对白洋淀这一典型的大型植物主导的浅湖进行了研究。结果表明，在高有机质和低有机质条件下，水体功能差异明显，矿化增强，硝化抑制，ureC增加40.63 %，而古菌amoA和细菌amoA分别减少94.88 %和94.30 %。SHAP进一步表明，OM是这三个功能基因变异的核心驱动因素，并表现出阈值样的非线性效应：当OM超过19.62 %/22.27 %时，amoA基因都转向抑制，而当OM超过12.71 %时，ureC基因转向促进，并在OM≈ 17 %时接近饱和。总之，这项研究揭示了与NH₄+ -N积累相关的沉积物氮功能的不同阈值制度，为描绘内部氮风险的敏感区间提供了定量线索，并为有针对性的管理提供了信息。

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引用次数: 0

Contrasting patterns of antibiotic resistance and metal resistance genes between free living and particle attached bacteria in a hypertrophic lake 富营养化湖泊中自由生活细菌和颗粒附着细菌对抗生素和金属抗性基因的对比分析

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1016/j.eti.2025.104705

Shengxing Wang , Yiwei Lu , Lei Jiang , Kaining Chen , Jiawei Gao , Shiqiang Wan , Li-Jun Zhou , Qinglong L. Wu

The eutrophication and algal blooms caused by human activities significantly change the structure of lake microbial communities. Yet whether this process can also cause changes in the dissemination of antibiotic resistance genes (ARGs), metal resistance genes (MRGs), and mobile genetic elements (MGEs) urgently needs to be investigated. In this study, metagenomic approaches were employed to investigate the abundance, diversity, relationships and hosts of ARGs, MRGs, MGEs and virulence factors (VFs) in free-living (FL) and particle-associated (PA) fractions during cyanobacterial blooms. The diversities of resistance genes were significantly higher in the FL fraction, while the abundance of MRGs and MGEs were greater in the PA fraction. Large-sized cyanobacterial aggregates may alter the bacterial community structure and modulate the diversity and abundance of resistance genes across distinct fractions. These aggregates enhanced topological complexity and multidimensional connectivity of microbial networks, while harboring elevated transposon abundance. Metagenomic assembly results demonstrated a high-frequency co-occurrence of transposons with MRGs, particularly in cyanobacteria-derived assembled sequences. This suggests that cyanobacterial aggregates, which are enriched with transposases, may facilitate the dissemination of MRGs in the environment. Furthermore, we identified potential pathogenic bacteria harboring multiple resistance genes and VFs. This work provides a systematic profile of resistance genes across fractions during cyanobacterial blooms, revealing distinct trends between ARGs and MRGs. These findings offer critical insights for developing effective lake management strategies to curb the dissemination of resistance genes.

人类活动引起的富营养化和藻华显著改变了湖泊微生物群落结构。然而，这一过程是否也会引起抗生素耐药基因（ARGs）、金属耐药基因（MRGs）和移动遗传元件（MGEs）传播的变化，迫切需要研究。在本研究中，采用宏基因组方法研究了蓝藻华期间自由生活（FL）和颗粒相关（PA）组分中ARGs、MRGs、MGEs和毒力因子（VFs）的丰度、多样性、关系和宿主。耐药基因多样性在FL组分中较高，而MRGs和MGEs丰度在PA组分中较高。大型蓝藻聚集体可能改变细菌群落结构，调节不同组分间抗性基因的多样性和丰度。这些聚集体增强了微生物网络的拓扑复杂性和多维连通性，同时拥有升高的转座子丰度。宏基因组组装结果表明，转座子与MRGs高频共存，特别是在蓝藻衍生的组装序列中。这表明富含转座酶的蓝藻聚集体可能促进MRGs在环境中的传播。此外，我们还发现了含有多种耐药基因和VFs的潜在致病菌。这项工作提供了在蓝藻华期间的抗性基因的系统概况，揭示了ARGs和MRGs之间的不同趋势。这些发现为制定有效的湖泊管理策略以遏制抗性基因的传播提供了重要的见解。

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引用次数: 0

Enhanced visible light PMS activation through novel direct Z-scheme heterojunction of N-doped TiO2 and O-laden g-C3N4 n掺杂TiO2与o负载g-C3N4的新型直接Z-scheme异质结增强可见光PMS活化

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation

Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.eti.2025.104693

Lixiang Wang , Qiang Ren , Xiaoli Wang

A novel direct Z-scheme heterojunction (NTMO) was synthesized via N-doped TiO₂ and O-doped carbon nitride integration, exhibiting exceptional visible-light photoactivity. Elemental doping narrowed the bandgap and improved the separation efficiency of photo-induced carriers in the heterojunction. Especially, O doping enhanced the adsorption capacity of the heterojunction for PMS, indicating that the presence of O could improve PMS activation through photo-induced electron. The NTMO/PMS system achieved 99.0 % trichloroethylene (TCE) degradation within 1 h 4.7 times and 2.4 times faster than pure TiO₂ and MCN, respectively. Mechanistic studies identified •SO₄^– and h⁺ as dominant reactive species. Furthermore, NTMO exhibited high stability after five cycles of testing. This work provides an efficient visible-light-driven strategy for persistent organic pollutant remediation.

通过n掺杂TiO2和o掺杂氮化碳集成合成了一种新型的直接z型异质结（NTMO），具有优异的可见光活性。元素掺杂可以缩小带隙，提高光致载流子在异质结中的分离效率。特别是O掺杂增强了异质结对PMS的吸附能力，表明O的存在可以通过光致电子提高PMS的活化能力。NTMO/PMS体系在1 h内对三氯乙烯（TCE）的降解率达到99.0 %，分别比纯TiO2和MCN快4.7倍和2.4倍。机理研究表明，•SO4 -和h+是主要的反应物质。此外，经过5次循环测试，NTMO表现出较高的稳定性。这项工作为持久性有机污染物的修复提供了一种有效的可见光驱动策略。

引用次数: 0