24年12月20日文献情报（7篇）

24年12月20日文献情报

1. 题目: Effect of intracellular algal organic matter and nitrate on disinfection byproduct formation in chlorinated water after UV/H2O2 and UV/Cl2 advanced oxidation processes

文章编号: N24122007
期刊: Environmental Science: Water Research & Technology
作者: Fateme Barancheshme, Olya S Keen
更新时间: 2024-12-20
摘要: Advanced oxidation processes (AOPs) are one of the highly effective alternatives for treatment of algal toxins in drinking water. Water that contains algal toxins commonly has organic matter of algal origin and elevated nitrate. Organic matter undergoes transformation during advanced oxidation processes and may change in a way that increases disinfection byproduct (DBP) formation when water is chlorinated post-AOP. Nitrate forms reactive nitrogen species under certain UV wavelengths that can also interact with organic matter and change its properties in a way that increases post-AOP DBP formation. Two types of advanced oxidation process (UV/H2O2 and UV/Cl2) were compared in their ability to change the formation potential of regulated DBPs [four trihalomethanes (THMs) and nine haloacetic acids (HAAs)] and an unregulated nitrogenous DBP (N-DBP) N-nitrosodimethylamine (NDMA) due to the interaction of the process with algal organic matter (AOM) and nitrate in the water. The two AOPs showed no difference in post-treatment DBP formation under any of the tested conditions. Higher levels of treatment with both processes led to slightly higher formation potential of some THMs. AOM made a poor precursor for additional THMs and three HAAs (six not consistently detected), but had a higher NDMA yield than background organic matter (0.59 ng/mg-C vs. 0.18 ng/mg-C, p = 0.038). Nitrate suppressed chlorinated THMs and favored increased concentrations of brominated THMs and HAAs, resulting in higher percent incorporation of background bromide into DBPs. Moreover, nitrate addition (20 mg-N/L of added nitrate compared to the background level of 0.47 mg-N/L) led to 11 times higher NDMA formation. Formation of N-DBPs during post-AOP chlorination in the presence of AOM and nitrate warrants additional investigation.
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2. 题目: Nitrogen-doped porous hydrochar for enhanced chromium(VI) and bisphenol A scavenging: Synergistic effect of chemical activation and hydrothermal doping

文章编号: N24122006
期刊: Environmental Research
作者: Jianhua Qu, Fansong Meng, Fuxuan Bi, Zhao Jiang, Mengning Wang, Qi Hu, Yupeng Zhang, Hui Yu, Ying Zhang
更新时间: 2024-12-20
摘要: Nitrogen-doped porous hydrochar (NPHC) was successfully synthesized by hydrothermal carbonization and activation with KHCO₃, which was employed for scavenging hexavalent chromium (Cr(VI)) and bisphenol A (BPA) in contaminated water. N doping increased the unique active sites such as amino and molecular N in NPHC for adsorbing contaminants, and enhanced the activation effect. Compared to original (HC) and N-doped hydrochar (NHC), the S_BET of material improved from 3.99 m²/g and 4.71 m²/g to 1176.77 m²/g. Meanwhile, NPHC exhibited more superior adsorption capacity for Cr(VI) (323.25 mg/g) and BPA (545.34 mg/g) than that of porous hydrochar (213.17 and 343.67 mg/g). Moreover, NPHC possessed pH-dependence and presented more excellent tolerance for interfering ions and regeneration performance. Notably, the Cr(VI) capture by NPHC was dominated via pore filling, electrostatic interaction, reduction, and complexation, while π-π stacking, H-bond interaction, and hydrophobic action were relevant to the binding mechanism of BPA. Overall, the proposed functionalization strategy for biochar was conducive to enhance the remediation of water bodies.
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3. 题目: Mineral and Microbial Properties Drive the Formation of Mineral-Associated Organic Matter and Its Response to Increased Temperature

文章编号: N24122005
期刊: Global Change Biology
作者: Jianing Zhao, Xuehui Feng, Jie Hu, Mei He, Siyu Wang, Yuanhe Yang, Leiyi Chen
更新时间: 2024-12-20
摘要: A comprehensive understanding of the formation of mineral-associated organic matter (MAOM) is a prerequisite for the sustainable management of soil carbon (C) and the development of effective long-term strategies for C sequestration in soils. Nevertheless, the precise manner by which microbial and mineral properties drive MAOM formation efficiency and its subsequent response to elevated temperature at the regional scale remains unclear. Here, we employed isotopically labelled laboratory incubations (at 15°C and 25°C) with soil samples from a ~3000 km transect across the Tibetan Plateau to elucidate the mechanisms underlying MAOM formation and its temperature response. The results indicated that both mineral protection and microbial properties were critical predictors of MAOM formation across the geographic gradient. The efficiency of MAOM formation was found to increase with the content of iron (Fe) oxides and their reactivity [i.e., the ratio of poorly crystalline Fe oxides to total Fe oxides (Fe_o:Fe_d)] but to decrease with the relative abundance of Gammaproteobacteria and Actinobacteria across the plateau. Moreover, a notable decline in MAOM formation efficiency was observed under elevated temperatures, which was concomitant with a reduction in the content and reactivity of Fe oxides, as well as the microbial assimilation of the labelled substrate. The attenuation of mineral–organic associations was identified as the primary factor contributing to the warming-induced reduction in MAOM formation. These findings highlight the necessity of incorporating organo–mineral associations and microbial properties into Earth System Models to accurately project soil C dynamics under changing climate.
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4. 题目: Microbial-derived C increased more than plant-derived in soil under plantation versus grassland 11 years after landslide

文章编号: N24122004
期刊: Journal of Soils and Sediments
作者: Xia Wang, Wenhui Duan, Zhiguo Hao, Huawei Zhu, Jieyi Xia, Jia Li, Junwu Wang, Yujin Chen, Yunfei Zhao
更新时间: 2024-12-20
摘要:

Purpose

Vegetation restoration can improve soil carbon (C) sink capacity, and is considered an effective approach for restoring degraded ecosystems. As an important component of soil organic carbon (SOC), microbial- and plant-derived C affect the size and turnover of the SOC pool; however, the effects of different vegetation types on SOC sequestration capacity remains controversial due to the lack of long-term systematic observations in restoration areas.

Materials and methods

Amino sugars and lignin phenols (as biomarkers of microbial- and plant-derived C, respectively), together with several soil basic physicochemical properties in the topsoil (0–10 cm) and subsoil (40–50 cm) were investigated in an afforested (AF) and naturally restored grassland (NRG) of a shallow landslide ecological restoration area in the Bailong River Basin, China, following 11 years of restoration.

Results and discussion

In the topsoil, SOC sequestration efficiency of AF was 28.18% higher than that of NRG; Whereas AF was 6.69% lower than NRG in the subsoil. Further, the enrichment of amino sugars in soil was more favorable to SOC accumulation than lignin phenols, and the environmental factors affecting SOC and amino sugar accumulation showed relative uniformity. The more suitable environment for microbial survival within AF regions promoted the decomposition of lignin phenols, and increased the contribution of microbial-derived C to SOC compared with NRG; Further, the more stable SOC components in AF facilitated its resistance to external disturbances.

Conclusions

Our results demonstrated when compared with NRG, the contribution of plant-derived C to SOC was lower in the AF plots, while the contribution of microbe-derived C was both higher and more stable. These results provide novel information regarding the accumulation pathways of SOC in shallow landslide areas, and emphasize the importance of microbial-derived C in SOC sequestration, as well as suggesting that AF is more effective than NRG in SOC sequestration.

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5. 题目: Deciphering the mechanism of microbial metabolic function shift and dissolved organic matter variation in acidogenic fermentation of waste activated sludge induced by antiviral drugs.

文章编号: N24122003
期刊: Journal of Environmental Management
作者: Ruming Wang, Zhuoqin Wang, Chunxing Li, Jiamiao Chen, Nanwen Zhu
更新时间: 2024-12-20
摘要: Antiviral drugs (ATVs), as emerging contaminants enriched in wastewater activated sludge (WAS) in wastewater treatment plants, affect subsequent treatment. ATVs have been shown to have negative influences on anaerobic digestion of WAS, but it is unclear how ATVs affect functional microbial metabolic activity and changes in intermediates. Thus, the effect of the anti-HIV drug ritonavir (RIT) on the period of anaerobic fermentation (AF) and the response of microbial community structure were examined in this study. Results indicated that the production of total volatile fatty acids (VFAs) decreased from 2010.21 mg/L to 372.03 mg/L under 125-1000 μg RIT/kg TSS treatment. Characterization of organic matters revealed that dissolved organic matter in the high-dose RIT groups was less biodegradable, with lower protein content and higher humus content. Mechanistic analyses indicated that RIT exposure reduced the abundance of hydrolyzers and inhibited carbohydrate metabolism, resulting in an increased humification index in the RIT groups. In addition, the expression of genes associated with the synthesis of VFAs was also significantly reduced in the RIT groups, leading to a decrease in both the amount and type of VFAs. This study provides a novel perspective on the effects of emerging contaminants on WAS treatment processes and pollution prevention.
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6. 题目: Elucidation of ammonium and nitrate adsorption mechanisms by water hyacinth biochar: effects of pyrolysis temperature

文章编号: N24122002
期刊: Environmental Science and Pollution Research
作者: Yudai Kohira, Desalew Fentie, Mekuanint Lewoyehu, Tassapak Wutisirirattanachai, Ashenafei Gezahegn, Solomon Addisu, Shinjiro Sato
更新时间: 2024-12-20
摘要:

Numerous studies indicate biochar’s nitrogen (N) adsorption capacity plays a crucial role in soil N retention. However, there is limited understanding on inorganic N adsorption mechanisms in biochar derived from aquatic weeds such as water hyacinth (WH). This study investigated ammonium-N (NH₄⁺-N) and nitrate-N (NO₃^–-N) adsorption capacities and mechanisms of WH biochar pyrolyzed at different pyrolysis temperatures of 400 °C, 600 °C, and 800 °C (BC400, BC600, and BC800, respectively). Results showed NH₄⁺-N adsorption was maximized (1.07–1.09 mg g^–1) with BC400 at initial solution pH 7.0–9.0, while NO₃⁻-N adsorption peaked (0.80 mg g^–1) with BC800 at initial solution pH 5.0. Both NH₄⁺-N and NO₃^–-N followed well the Pseudo-second-order model in adsorption kinetics (R² = 0.990–0.997 and 0.962–0.992, respectively). The Sips model accurately described the adsorption isotherms for NH₄⁺-N (R² = 0.994–0.999) and NO₃^–-N (R² = 0.992–0.999). The calculated maximum adsorption capacity for NH₄⁺-N and NO₃^–-N using Sips model was 11.2–16.8 mg g^–1 and 0.693–4.99 mg g^–1, respectively. Co-existing cations and anions reduced NH₄⁺-N and NO₃^–-N adsorption capacity, respectively, with other ions with higher valence exhibiting higher inhibition effects (43%–97% and 44%–73%, respectively). Primary adsorption mechanism for NH₄⁺-N included cation exchange via oxygen-containing surface functional groups in BC400 and pore filling and surface struvite precipitation in BC800. Major adsorption mechanisms for NO₃^–-N included electrostatic interactions in BC400 and pore filling in BC800. These findings suggested that biochar derived from aquatic weeds possessed the same potential usefulness for soil N retention as biochar from other feedstocks, and that it might assist for further detailed considerations in other studies for biochar soil application.

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7. 题目: Three-dimensional Fluorescence Spectrum Characteristics and Source Analysis of Dissolved Organic Matter in Sewage Outfall into the Sea of Dongguan

文章编号: N24122001
期刊: Water, Air, & Soil Pollution
作者: Changzheng Wu, Jinquan Wan, Jinpeng Wang, Jinlan Cai, Xiuwen Ren, Yan Wang, Zhangqing Bi
更新时间: 2024-12-20
摘要:

The composition and source analysis of dissolved organic matter (DOM) in sewage outfall into the sea is an effective means of pollutant traceability, which is of great significance to the ecological environment protection in coastal areas. This paper selects Dongguan, an important coastal industrial city in China’s Pearl River, for research. Water samples from 42 sewage outfalls into the sea were measured by three-dimensional fluorescence spectroscopy (3D-EEM). Combined with fluorescence characteristic parameters, similarity analysis and parallel factor analysis (PARAFAC), the spectral characteristics, DOM composition and source were analyzed. The average values of fluorescence parameters fluorescence index (FI), biological index (BIX) and humification index (HIX) were 1.80, 0.94 and 0.55, respectively. The overall PARAFAC analysis found that DOM in the sewage outfall of Dongguan was mainly composed of two fluorescent components, namely tyrosine-like (C1) and humus-like (C2), where tyrosine-like fluorescence was higher than humus-like. This indicates that DOM comes from both terrestrial and endogenous biological activities, but endogenous sources are the primary sources. The similarity analysis divided sewage outfalls into four categories, namely urban rainwater drainage characteristics, typical urban sewage, Jiulong paper-related wastewater and aquaculture water in fish ponds. At the same time, in the PARAFAC analysis, the fluorescence components of 14 urban rainwater outfalls were consistent with the overall analysis results. There are 3 effective parallel factor fluorescence components in 23 outfalls most likely to be contaminated by domestic sewage, namely tyrosine (C1) Humus-like (C2) and tryptophan (C3), C3 components in the characterization of the protein fluorescent tryptophan substance region appeared a strong response peak, belonging to the source pollution, consistent with similarity analysis results. This study suggests that the same source sewage outfalls should be classified management, strengthen the source tracing of sewage outfalls into the sea in neighboring cities, and build a collaborative pollution control system for river basins, estuaries and coastal.

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