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Fenton-derived iron for reversible self-assembly of alginate network: A sustainable strategy for simultaneous antibiotic degradation and microplastic removal fenton衍生铁用于海藻酸盐网络的可逆自组装:同时降解抗生素和微塑料去除的可持续策略
IF 11.1 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Pub Date : 2026-02-10 DOI: 10.1016/j.jclepro.2026.147750
Peilin Li, Tianbin Bai, Tianming Li, Yanlong Liu, Nanxi Song, Yiwen Cui, Yian Zheng
The concurrent presence of antibiotics and microplastics (MPs) in aquatic environments poses a significant treatment challenge, as conventional approaches largely adhere to a “remove-and-dispose” framework. Herein, we present a sustainable strategy that repurposes iron by-products from Fenton reactions to create functional coordination centers for managing MPs. The newly developed Alginate-Fenton Smart Sequestration (AFSS) system utilizes in-situ generated Fe3+, which is usually considered waste from Fenton process, to cross-link sodium alginate and form a 3D network for effective encapsulation of MPs without the need for additional chemicals. The incorporated reversibility, achieved through biocompatible ascorbic acid, enables the controlled release of MPs, with recovery efficiencies reaching 86% under ambient conditions. The AFSS system demonstrated consistent performance in diverse environmental waters, efficiently degrading antibiotic and maintaining the removal of multiple types of MPs at over 97%. This work establishes a sustainable approach in which residual iron is transformed into a reusable resource for capturing and recovering MPs, thereby advancing water treatment towards circular resource management.
抗生素和微塑料(MPs)在水生环境中的同时存在给治疗带来了重大挑战,因为传统方法在很大程度上坚持“去除和处理”框架。在此,我们提出了一种可持续的策略,重新利用芬顿反应的铁副产品来创建管理MPs的功能协调中心。新开发的藻酸盐-Fenton智能封存(AFSS)系统利用原位生成的Fe3+(通常被认为是Fenton工艺的废物)交联海藻酸钠,形成3D网络,无需额外的化学品即可有效封装MPs。通过生物相容性抗坏血酸实现的掺入可逆性,使MPs可控释放,在环境条件下回收率达到86%。AFSS系统在不同的环境水域中表现出一致的性能,有效地降解抗生素,并将多种MPs的去除率保持在97%以上。这项工作建立了一种可持续的方法,其中残铁转化为可重复使用的资源,用于捕获和回收MPs,从而推动水处理朝着循环资源管理的方向发展。
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引用次数: 0
Diclofenac stress responses and biotransformation pathways in the marine diatom Phaeodactylum tricornutum 双氯芬酸胁迫对海洋硅藻褐指藻生物转化途径的影响
IF 8.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2026-02-10 DOI: 10.1016/j.envpol.2026.127797
Leopold Alezra, Emilie Le Floch, Christine Felix, David Rosain, Elena Gomez, Frederique Courant, Eric Fouilland, Giulia Cheloni
In the last years great effort was made by the scientific community to investigate the role of phytoplankton in contaminants stress responses and metabolism. However, biotransformation pathways remain underexplored in phytoplankton groups, such as diatoms, that play important ecological roles in natural environment and that are routinely used in biotechnological processes. The present study adopted a multi-omics approach to investigate diclofenac (DCF) physiological effects, transcriptional responses and metabolism in the marine diatom Phaeodactylum tricornutum with the aim of getting an insight on biotransformation pathways. DCF resulted in mild physiological effects on P. tricornutum but gene expression analysis indicated that multiple molecular functions and biological processes were altered during exposure. Transcriptomic analysis suggested increased nutrients and energy requirements possibly associated with the contaminant stress and detoxification metabolism. DCF bioconcentration factor (BCF) was low and varied between 3.9 and 2.7 L Kg-1 depending on the exposure concentration. In total 6 DCF metabolites were detected of which 4’-Hydroxydiclofenac, a metabolite generally associated with Cytochrome P450 (CYP) enzymatic activity. Involvement of CYPs in biotransformation was suggested via indirect evidences. The five additional DCF metabolites detected presented high molecular weight. These metabolites were not previously described in the literature and were hypothesized to be generated via amino acid (or peptides) conjugation. Gene ontology analysis indicated that amino acid and peptide biosynthetic pathways were regulated upon DCF exposure supporting a possible correlation between organic contaminants detoxification responses and amino acid and protein metabolism in this diatom. Our findings provide mechanistic insights into contaminant detoxification and contribute to highlight the diversity of biotransformation pathways in phytoplankton.
近年来,科学界对浮游植物在污染物胁迫反应和代谢中的作用进行了大量的研究。然而,硅藻等浮游植物群的生物转化途径仍未得到充分探索,它们在自然环境中起着重要的生态作用,并经常用于生物技术过程。本研究采用多组学方法研究双氯芬酸(DCF)在海洋硅藻三角藻(Phaeodactylum tricornutum)中的生理效应、转录反应和代谢,旨在了解其生物转化途径。DCF对tricornutum有轻微的生理影响,但基因表达分析表明,DCF对tricornutum的多种分子功能和生物学过程产生了影响。转录组学分析表明,增加的营养和能量需求可能与污染物胁迫和解毒代谢有关。DCF生物浓度因子(BCF)较低,随暴露浓度变化在3.9 ~ 2.7 L Kg-1之间。共检测到6种DCF代谢物,其中4′-羟基双氯芬酸是一种通常与细胞色素P450 (CYP)酶活性相关的代谢物。通过间接证据表明CYPs参与了生物转化。另外5个检测到的DCF代谢物呈现高分子量。这些代谢物以前没有在文献中描述过,假设是通过氨基酸(或肽)偶联产生的。基因本体论分析表明,暴露于DCF后,氨基酸和肽的生物合成途径受到调控,支持有机污染物解毒反应与该硅藻氨基酸和蛋白质代谢之间可能存在相关性。我们的发现为污染物解毒提供了机制见解,并有助于突出浮游植物生物转化途径的多样性。
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引用次数: 0
Impact of alpha self-absorption on personal air sampling in NORM operations. 规范作业中α自吸收对个人空气采样的影响。
IF 1.8 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2026-02-09 DOI: 10.1088/1361-6498/ae3f3e
Gregory S Hewson, Martin I Ralph, Marcus Cattani

Personal air sampling (PAS) is used to assess worker intake of airborne radioactivity in operations processing minerals containing naturally occurring radionuclides. Subsequent alpha particle counting of the PAS filter may be affected by self-absorption of the alpha particles in the dust matrix or filter, depending on the dust loading on the filter and the size of particles collected. This review investigates the potential for self-absorption on air sampling filters via a literature review and by applying a formula to correct past PAS data from the mineral sand industry. The findings indicate that PAS estimates of intake were consistently under-stated by at least 40% across work categories engaged in the operation and maintenance of mineral sand separation plants. An alpha particle self-absorption greater than 50% was derived when dust loading on the PAS filter exceeded 3 mg·cm-2. The findings demonstrate that historical PAS data in industries where self-absorption effects are neglected can substantially underestimate worker radionuclide intakes and doses, with important implications for retrospective dose assessment.

个人空气取样(PAS)用于评估工人在加工含有天然放射性核素的矿物的作业中吸入的空气放射性。PAS过滤器的后续α粒子计数可能受到粉尘基质或过滤器中α粒子的自吸收的影响,这取决于过滤器上的粉尘负荷和收集的颗粒大小。本综述通过文献综述和应用公式来纠正矿砂行业过去的PAS数据,研究了空气采样过滤器自吸收的潜力。研究结果表明,在矿砂分离厂的操作和维护工作类别中,PAS对摄入量的估计一直被低估至少40%。当PAS过滤器上的粉尘负荷超过3 mg cm-2时,α粒子的自吸收率大于50%。研究结果表明,忽略自吸收效应的工业的历史PAS数据可能大大低估了工人的放射性核素摄入量和剂量,这对回顾性剂量评估具有重要意义。
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引用次数: 0
GHG emission from diesel-powered irrigation pumps and mitigation potentials in agriculture sector of Nepal. 尼泊尔农业部门柴油动力灌溉泵的温室气体排放和减缓潜力。
IF 5.8 3区 环境科学与生态学 0 ENVIRONMENTAL SCIENCES Pub Date : 2026-02-09 DOI: 10.1007/s11356-026-37494-5
Sudeep Thakuri, Shisher Shrestha, Raista Palikhe, Raju Chauhan

Emissions from diesel-powered irrigation pumps (DIPs) in Nepal's agriculture sector contribute to climate change and local air pollution. This study presents the emission estimation using emission factors (EFs) for energy use in DIPs and estimates the contribution of DIPs to the GHGs emission in Nepal using both the bottom-up and top-down approaches. It involves analyzing data on the number of DIPs, the amount of fuel used for irrigation, hours of operations, and efficiency of the pumps. The various EFs for the DIPs were collected from the previous research reports and articles. The activity data for the bottom-up approach was collected from a telephone survey, field sampling, and review of the existing documents. The country-specific EFs for energy use in DIPs developed in Nepal by previous studies using sample measurements were used in this study. The estimated number of DIPs for 2024 is about 51,137 (1.5 to 9 hp; average 5 hp DIPs), operating an average of 192 h per year in Nepal. The DIPs consume 5891 m3 (kL) of fuel per year and emit 14,674 tons of CO2, 20.9 tons of CH4, 0.18 tons of N2O, 71.3 tons of NOx, 52.2 tons of non-methane volatile organic carbon (NMVOC), 332.0 tons of CO, 54.4 tons of PM2.5, 40.30 tons of organic carbon (OC), 17.8 tons of black carbon (BC), and 0.6 tons of SO2 each year. The number of solar-powered irrigation pumps (SIPs) is 3129, which is about 2% of total irrigation pumps in Nepal. Farmers are providing encouraging feedback on the use of SIPs in their small-sized farms. The study shows that the number of electricity-powered pumps has increased rapidly by replacing the DIPs after the mid-2010s due to increased access to the grid electricity. The assessment is expected to support identifying opportunities to reduce emissions through improvements in technology, management practices, and other strategies.

尼泊尔农业部门柴油灌溉泵(DIPs)的排放加剧了气候变化和当地空气污染。本研究提出了利用排放因子(EFs)对dip的能源使用进行排放估算,并使用自下而上和自上而下的方法估算了dip对尼泊尔温室气体排放的贡献。它包括分析dip的数量、用于灌溉的燃料量、运行时间和水泵效率等数据。dip的各种EFs是从以前的研究报告和文章中收集的。自下而上方法的活动数据是从电话调查、实地抽样和对现有文件的审查中收集的。在本研究中使用了尼泊尔以前使用样本测量的研究开发的针对dip能源使用的国别EFs。预计2024年dip数量约为51137台(1.5至9马力;平均dip为5马力),在尼泊尔平均每年运行192小时。DIPs每年消耗5891立方米(kL)燃料,排放14674吨二氧化碳、20.9吨CH4、0.18吨N2O、71.3吨NOx、52.2吨非甲烷挥发性有机碳(NMVOC)、332.0吨CO、54.4吨PM2.5、40.30吨有机碳(OC)、17.8吨黑碳(BC)和0.6吨SO2。太阳能灌溉泵(sip)的数量为3129台,约占尼泊尔灌溉泵总数的2%。农民对在他们的小型农场使用SIPs提供了令人鼓舞的反馈。该研究表明,由于电网供电的增加,2010年代中期以后,电动泵的数量迅速增加,取代了dip。预计该评估将有助于确定通过改进技术、管理实践和其他战略来减少排放的机会。
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引用次数: 0
Health risk assessment of radon exposure through drinking water in Iluagba, Kogi State, Nigeria. 尼日利亚科吉州伊卢格巴通过饮用水接触氡的健康风险评估。
IF 1.4 4区 环境科学与生态学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2026-02-09 DOI: 10.1080/10256016.2026.2615248
Ibrahim Ayodeji Bello, Abdullahi Muhammad Vatsa, Hameed Adavize Momoh, Taiwo Abadunmi, A A Bello

This study investigates radon concentrations in groundwater from 20 locations in Iluagba, Kogi State, Nigeria, analyzed using a liquid scintillation counter. Radon levels ranged from 10.6-43.1 Bq/L (average 24.1 Bq/L). Although below the World Health Organisation (WHO) limit of 100 Bq/L, about 90 % exceeded the United States Environmental Protection Agency (USEPA) advisory level of 11.1 Bq/L, indicating potential long-term health risks. The annual effective dose (AED) was highest in infants (up to 163.5 µSv/y), with seven samples exceeding the WHO reference dose of 100 µSv/y. Excess lifetime cancer risk (ELCR) values for all age groups surpassed the USEPA safety threshold (1.0 × 10-⁴), identifying infants as the most vulnerable group. Organ-specific analysis showed the lungs received substantially higher doses than the stomach, confirming inhalation as the primary exposure route. While strong correlations (r ≈ 1.0) validated internal data consistency, the elevated radiological risk remains the key concern. Compared with other Nigerian regions, Iluagba exhibits moderate to high exposure levels. These findings underscore the need for targeted radon mitigation, community education, and routine groundwater monitoring to safeguard public health in Kogi State.

本研究调查了尼日利亚科吉州伊卢格巴20个地点地下水中的氡浓度,并使用液体闪烁计数器进行了分析。氡水平介乎10.6至43.1 Bq/L(平均24.1 Bq/L)。虽然低于世界卫生组织(WHO) 100 Bq/L的限值,但超过美国环境保护署(USEPA) 11.1 Bq/L的咨询水平约90% %,表明潜在的长期健康风险。婴儿的年有效剂量(AED)最高(高达163.5 µSv/y),有7个样本超过世卫组织100 µSv/y的参考剂量。所有年龄组的超额终身癌症风险(ELCR)值都超过了美国环保署的安全阈值(1.0 × 10-⁴),将婴儿确定为最脆弱的群体。器官特异性分析显示,肺部受到的剂量明显高于胃,证实了吸入是主要的暴露途径。虽然强相关性(r ≈ 1.0)验证了内部数据的一致性,但辐射风险的升高仍然是关键问题。与尼日利亚其他地区相比,伊卢格巴显示出中度至高度的暴露水平。这些调查结果强调需要有针对性地减少氡,开展社区教育和常规地下水监测,以保障科吉州的公众健康。
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引用次数: 0
Combined Enterohepatic Toxicity of Polystyrene Microplastics and Di(2-ethylhexyl) Phthalate in Mice: Gut Microbiota-Dependent Synergistic Effects 聚苯乙烯微塑料和邻苯二甲酸二(2-乙基己基)对小鼠的联合肠肝毒性:肠道微生物依赖的协同效应
IF 8.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2026-02-09 DOI: 10.1016/j.envpol.2026.127792
Yuzhi Lan, Tao You, Xiaoyan Feng, Jiajun Guo, Hengyi Xu
With growing toxicological research on microplastics (MPs), scientific attention has shifted from their single toxicity to their combined toxicity with other pollutants. Di(2-ethylhexyl) phthalate (DEHP), a common synthetic plasticizer, may co-occur with MPs through intrinsic association during production or through exogenous environmental pathways, posing the significant risk of co-exposure to organism. Oral exposure represents the primary route for MPs and DEHP, which traverse the gastrointestinal tract and target the enterohepatic system through direct intestinal interaction and systemic circulation. However, their combined toxicity, especially enterohepatic, remains poorly studied in the mammals. In this study, adult C57/BL6J mice were employed and exposed to polystyrene MPs (PS-MPs), DEHP or both for eight weeks. It was revealed that co-exposure to PS-MPs and DEHP induced more significant enterohepatic toxicity than the single exposures, involving enhanced enterohepatic inflammatory response and oxidative stress, as well as intestinal microbial disturbance. Furthermore, after fecal microbiota transplantation, the recipient mice developed similar trends of enterohepatic toxicity to those observed in the corresponding donor mice, revealing the key function played by intestinal microbiota. This study highlighted the crucial link of the gut-liver axis in the combined effects of PS-MPs and DEHP-induced enterohepatic toxicity in mammals and provided a mechanism insight of co-exposure to MPs and other environmental pollutants.
随着对微塑料的毒理学研究日益深入,科学研究的重点已从其单一毒性转向其与其他污染物的复合毒性。邻苯二甲酸二(2-乙基己基)酯(DEHP)是一种常见的合成增塑剂,可能在生产过程中通过内在关联或通过外源性环境途径与多磺酸粘多糖共同发生,对生物体构成共同暴露的重大风险。口服暴露是MPs和DEHP的主要途径,它们穿过胃肠道,通过直接的肠道相互作用和体循环靶向肠肝系统。然而,它们的联合毒性,特别是肠肝毒性,在哺乳动物中的研究仍然很少。在本研究中,成年C57/BL6J小鼠暴露于聚苯乙烯MPs (PS-MPs)、DEHP或两者同时暴露8周。结果表明,PS-MPs和DEHP共暴露比单独暴露诱导的肠肝毒性更显著,包括肠肝炎症反应和氧化应激增强,以及肠道微生物紊乱。此外,粪便微生物群移植后,受体小鼠与相应的供体小鼠出现了相似的肠肝毒性趋势,揭示了肠道微生物群发挥的关键功能。本研究强调了肠道-肝脏轴在PS-MPs和dehp诱导的哺乳动物肠肝毒性联合效应中的重要联系,并提供了MPs与其他环境污染物共同暴露的机制见解。
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引用次数: 0
Hyperspectral species maps and LiDAR‐based structured population models show future forest fire frequency may compromise forest resilience 高光谱物种图和基于激光雷达的结构化种群模型显示,未来森林火灾的频率可能会损害森林的恢复能力
IF 5.5 2区 环境科学与生态学 Q1 ECOLOGY Pub Date : 2026-02-09 DOI: 10.1002/rse2.70057
Jessica McLean, Tommaso Jucker, Alice Rosen, Sean M. McMahon, Roberto Salguero‐Gómez
Forest disturbances are accelerating biodiversity loss and altering tree productivity worldwide. Post‐disturbance recovery time, a component of resilience, is critical for identifying vulnerable areas and targeting conservation but varies with environmental conditions. Monitoring recovery at scale requires tracking tree dynamics, yet traditional ground‐based approaches are resource‐intensive. We present a pipeline to parameterize integral projection models (IPMs) using LiDAR data and hyperspectral‐based species maps to assess post‐fire recovery across large, forested areas. Focusing on the fire‐adapted Picea mariana , we model passage times to reproductive heights and life expectancy under different fire regimes as indicators of recovery time. To do this, we combined hyperspectral‐based species maps and LiDAR‐based crown heights to track individual tree survival and growth at the Caribou‐Poker Creek Research Watershed (BONA) from 2017 to 2023. We incorporated fire history, aspect, slope, elevation and surrounding canopy height into our models and found partial support for their expected effects on survival and growth. Once accounting for topography and competition, we estimated passage times to reproductive maturity (11–22 years). Life expectancy in the absence of fire is shortest on North‐facing slopes with recent fire (581 years). Sensitivity analyses highlight fire history and aspect as key modulators of population resilience, with elevation exerting strong influence on life expectancy across all conditions. Our results demonstrate that remotely sensed IPMs can effectively quantify forest recovery at scale, revealing that in some contexts, stands of P. mariana may not recover between fire disturbances. We discuss the implications of these findings for advancing modelling of resilience and highlight both the challenges and opportunities of using LiDAR and hyperspectral data to build demographic models for forecasting forest dynamics.
森林干扰正在加速生物多样性的丧失,并改变世界范围内的树木生产力。干扰后恢复时间是恢复力的一个组成部分,对于确定脆弱地区和目标保护至关重要,但随着环境条件的变化而变化。大规模监测恢复需要跟踪树木动态,而传统的地面方法是资源密集型的。我们提出了一种利用激光雷达数据和基于高光谱的物种图来参数化积分投影模型(ipm)的方法,以评估大面积森林地区的火灾后恢复情况。以适应火灾的马里亚纳云杉为研究对象,我们对不同火灾条件下到达繁殖高度的时间和预期寿命作为恢复时间的指标进行了建模。为了做到这一点,我们结合了基于高光谱的物种地图和基于激光雷达的树冠高度,以跟踪2017年至2023年北美驯鹿-波克溪研究流域(BONA)的个体树木生存和生长情况。我们将火灾历史、坡向、坡度、海拔和周围冠层高度纳入我们的模型,并发现它们对生存和生长的预期影响部分支持。一旦考虑地形和竞争,我们估计到生殖成熟的传代时间(11-22年)。在没有火灾的情况下,最近发生火灾的朝北斜坡的预期寿命最短(581年)。敏感性分析强调火灾历史和地形是人口恢复力的关键调节因子,海拔高度对所有条件下的预期寿命都有很强的影响。我们的研究结果表明,遥感IPMs可以有效地量化尺度上的森林恢复,揭示在某些情况下,马里亚纳林分可能不会在火灾干扰期间恢复。我们讨论了这些发现对推进复原力建模的意义,并强调了使用激光雷达和高光谱数据建立预测森林动态的人口模型的挑战和机遇。
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引用次数: 0
Comparative Effects of Raw and Aged Tire Microplastics on Anaerobic Fermentation of Excess Sludge 生、老化轮胎微塑料对剩余污泥厌氧发酵的影响比较
IF 13.6 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Pub Date : 2026-02-09 DOI: 10.1016/j.jhazmat.2026.141391
Hu Kai, Ding Hao, Wang Wei, Guo Rui, Chen Wei, Xu Hang
Tire microplastics (TMs), as a prominent environmental source of microplastic pollution, are aged and accumulated during their migration through drainage systems and sewage treatment facilities, most of which trapped in excess sludge. Consequently, this study systematically examines the concentration-dependent effects of TMs and aged TMs (ATMs) on anaerobic fermentation of excess sludge. Results showed that TMs and ATMs negatively affected acidogenic fermentation and organic matter hydrolysis. Low TMs concentration (0.002 g/g-VSS) and high ATMs concentration (0.2 g/g-VSS) resulted in concentration reductions of volatile fatty acids, soluble chemical oxygen demand, proteins, and polysaccharides ranged from 16.28% - 40.40% relative to the control group. In general, the detrimental effect demonstrated a positive correlation with ATM concentration. Conversely, low TMs concentration exerted a ‌significant inhibitory impact compared with high concentration, which contradicted the hormetic effect. In response to TMs/ATMs stress, the microorganisms employed extracellular polymeric substances (EPS) secretion as a defense mechanism, with pronounced‌ variations examined in protein content within tightly bound EPS and polysaccharide content in loosely bound EPS. Comprehensive mechanistic analysis revealed that although the incorporation of TMs/ATMs into fermentation system improved electron transfer efficiency through elevating electron transport system activity and sludge conductivity, TMs demonstrated superior interspecies electron transfer (IET) enhancement compared to ATMs, coupled with material-dependent suppression of hydrolytic and acidogenic bacterial consortia, which potentially altering the acid generation and microbial dynamics. Overall, our study provides critical insights for optimizing TMs control in sludge treatment by leveraging their differential profiles toward IET and bacterial consortia.
轮胎微塑料(TMs)作为微塑料污染的重要环境来源,在其通过排水系统和污水处理设施迁移过程中老化和积累,其中大部分被滞留在多余的污泥中。因此,本研究系统地考察了TMs和老化TMs (atm)对剩余污泥厌氧发酵的浓度依赖性影响。结果表明,TMs和ATMs对产酸发酵和有机物水解均有不利影响。低TMs浓度(0.002 g/g- vss)和高ATMs浓度(0.2 g/g- vss)导致挥发性脂肪酸、可溶性化学需氧量、蛋白质和多糖的浓度较对照组降低16.28% ~ 40.40%。总的来说,有害影响与ATM浓度呈正相关。相反,与高浓度相比,低浓度的TMs具有显著的抑制作用,这与激效效应相矛盾。为了应对TMs/ atm胁迫,微生物利用细胞外聚合物(EPS)分泌作为防御机制,在紧密结合的EPS中蛋白质含量和松散结合的EPS中多糖含量发生了明显的变化。综合机理分析表明,虽然TMs/ atm加入发酵系统通过提高电子传递系统活性和污泥电导率提高了电子传递效率,但与atm相比,TMs表现出更强的种间电子传递(IET)增强,再加上对水解菌和产酸菌群的物质依赖性抑制,这可能改变酸的产生和微生物动力学。总的来说,我们的研究通过利用TMs对IET和细菌联合体的不同概况,为优化污泥处理中的TMs控制提供了重要见解。
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引用次数: 0
Far UVC (222 nm) Enhances Chloramine-Based Advanced Oxidation in Wastewater Recycling: 1,4-Dioxane Removal, Radical Generation, and DBP Formation 远UVC (222 nm)增强氯胺基深度氧化废水循环:1,4-二氧六环去除,自由基生成和DBP形成
IF 12.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Pub Date : 2026-02-09 DOI: 10.1016/j.watres.2026.125541
Mohsin Uddin, Jiale Xu
UV-based advanced oxidation process (AOP) is critical for wastewater recycling to control organic micropollutants (e.g., 1,4-dioxane) that remain in reverse osmosis permeates. Krypton chloride excimer lamp emitting at far-UVC 222 nm (UV222) is promising for water treatment. This study demonstrated that far-UVC light enhanced UV/NH2Cl compared with traditional low-pressure UV (LPUV) at 254 nm (UV254) for wastewater recycling. Its impacts on 1,4-dioxane (1,4-D) removal, radical steady-state concentrations, and DBP formation were assessed. A low fluence rate of 0.31 mW/cm2 was used due to fast photolysis of NH2Cl at 222 nm. UV222/NH2Cl at 50 mg Cl2/L exhibited a 1,4-D decay rate constant at 1.7 × 10-3 cm2/mJ, 17.2 times higher than UV254/NH2Cl. Far UVC at 222 nm also increased the direct photolysis rate of 1,4-D by 12-fold over LPUV. UV222/NH2Cl showed higher 1,4-D removal than UV222/NHCl2, followed by UV222/H2O2. Mechanistic investigation revealed that steady-state concentrations of OH and Cl2•- from UV222/NH2Cl were 12 and 31 times higher than those from UV254/NH2Cl, respectively. Experiments using wastewater RO permeate, RO concentrate, and tap water showed that UV222/NH2Cl consistently achieved efficient control of 1,4-D even in complex matrices. UV222/NH2Cl exhibited slightly higher or similar risk compared with UV254/NH2Cl in generating precursors of disinfection byproducts. Overall, KrCl* excilamps-based AOP using NH2Cl provided efficient contaminant removal in wastewater recycling and merits further research.
基于uv的高级氧化工艺(AOP)是废水回收控制有机微污染物(如1,4-二恶烷)的关键,这些污染物仍留在反渗透渗透物中。远紫外222nm的氯化氪准分子灯(UV222)是一种很有前途的水处理光源。研究表明,与传统的254 nm (UV254)低压紫外线(LPUV)相比,远紫外线光增强了废水回收中的UV/NH2Cl。评估了其对1,4-二恶烷(1,4- d)去除、自由基稳态浓度和DBP形成的影响。由于NH2Cl在222 nm光解速度快,所以通量较低,为0.31 mW/cm2。在50 mg Cl2/L条件下,UV222/NH2Cl的衰变速率为1.7 × 10-3 cm2/mJ,是UV254/NH2Cl的17.2倍。在222 nm远紫外波段,1,4- d的直接光解速率比LPUV提高了12倍。UV222/NH2Cl对1,4- d的去除率高于UV222/NHCl2,其次是UV222/H2O2。机理研究表明,UV222/NH2Cl中•OH和Cl2•-的稳态浓度分别比UV254/NH2Cl高12倍和31倍。对废水渗透液、反渗透浓缩液和自来水进行的实验表明,UV222/NH2Cl即使在复杂基质中也能保持对1,4- d的有效控制。与UV254/NH2Cl相比,UV222/NH2Cl产生消毒副产物前体的风险略高或相似。综上所述,基于KrCl* excilamp的NH2Cl AOP在废水回收中具有高效的污染物去除效果,值得进一步研究。
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引用次数: 0
Alpha spectrometric analysis and environmental assessment of uranium concentrations in soil and vegetation from the Tafila District, Jordan. 约旦塔菲拉地区土壤和植被中铀浓度的α光谱分析和环境评价。
IF 1.4 4区 环境科学与生态学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2026-02-09 DOI: 10.1080/10256016.2026.2617939
Abdul-Wali Ajlouni, Kholoud Kharisat, Mahmoud Kulab, Ahmed Qwasmeh, Naima Amrani, Zinab Matar, Hana Almarri, Khaled Ali

This study aims to determine the specific activity of natural uranium isotopes, including uranium-238 (238U), uranium-234 (234U), and uranium-235 (235U), in soil and vegetable samples - specifically tomato, potato, onion, carrot, and radish - collected from the Tafila district, Jordan, and to assess the soil-to-plant transfer factors using alpha spectrometry with a passivated implanted planar silicon (PIPS) detector. A total of eight soil samples and eight corresponding vegetable samples were obtained from eight distinct locations. The results revealed considerable spatial variability in uranium activity concentrations, reflecting the influence of geological formations and environmental conditions. The average activity concentrations were 251.6 ± 14.2 Bq/kg for 238U, 10.5 ± 1.9 Bq/kg for 235U, and 248.8 ± 13.9 Bq/kg for 234U in soil samples, while vegetable samples showed lower concentrations of 3.2 ± 0.16, 0.21 ± 0.05, and 3.1 ± 0.17 Bq/kg for 238U, 235U, and 234U, respectively. The calculated transfer factors ranged from 4.4 ± 0.4 × 10-3 to 29.1 ± 1.8 × 10-3 for 238U, 6.4 ± 1.4 × 10-3 to 33.0 ± 15.7 × 10-3 for 235U, and 4.3 ± 0.4 × 10-3 to 28.7 ± 1.9 × 10-3 for 234U, which reflects notable differences in uranium uptake efficiency among the studied plant species. A strong correlation (R2 = 0.99) was observed between 238U and 234U in both soil and vegetable samples, suggesting isotopic equilibrium through natural decay. These findings provide essential baseline data for future studies on uranium mobility, bioavailability, and potential radiological risks in agricultural systems within the Tafila District.

本研究的目的是确定天然铀同位素,包括铀-238 (238U),铀-234 (234U)和铀-235 (235U),在土壤和蔬菜样品-特别是番茄,土豆,洋葱,胡萝卜和萝卜-收集从约旦塔菲拉地区,并评估土壤到植物转移因子使用α光谱与钝化植入平面硅(PIPS)探测器。在8个不同的地点共获得8个土壤样品和8个相应的蔬菜样品。结果显示,铀活度浓度具有较大的空间变异性,反映了地质构造和环境条件的影响。土壤样品中238U、235U和234U的平均活性浓度分别为251.6±14.2 Bq/kg、10.5±1.9 Bq/kg和248.8±13.9 Bq/kg,蔬菜样品中238U、235U和234U的平均活性浓度分别为3.2±0.16、0.21±0.05和3.1±0.17 Bq/kg。238U的传递系数为4.4±0.4 × 10-3 ~ 29.1±1.8 × 10-3, 235U的传递系数为6.4±1.4 × 10-3 ~ 33.0±15.7 × 10-3, 234U的传递系数为4.3±0.4 × 10-3 ~ 28.7±1.9 × 10-3,表明不同植物对铀的吸收效率存在显著差异。土壤和蔬菜样品中的238U和234U之间存在很强的相关性(R2 = 0.99),表明同位素平衡是通过自然衰变实现的。这些发现为今后研究塔菲拉地区农业系统中铀的流动性、生物利用度和潜在辐射风险提供了必要的基线数据。
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