Author: Xie, Jie ; Li, Xin-Ting ; Lian, Xin-Lei ; Zhang, Rong-Min ; Chen, Xiao-Jie ; Tan, Hui-Zhen ; Chong, Yun-Xiao ; Li, Ya-Fei ; Huang, Wen-Qing ; Huang, Xian-Hui ; Li, Ling-Lin

Submerged macrophytes in constructed wetlands (CWs) can effectively improve wastewater quality. However, the effectiveness of different submerged macrophytes in removing antibiotic-resistant genes (ARGs) from wastewater remains unexplored. Additionally, wastewater loading in wetlands can fluctuate due to climate change, potentially affecting ARG removal efficiency. In this study, we systematically constructed microscale wetlands using three submerged plants: Vallisneria natans (VN), Sagittaria pygmaea (SP), and Myriophyllum spicatum (MS). Their effectiveness in ARGs removal was analyzed at hydraulic retention times (HRTs) of 0, 3, 6, and 9 days under high (HWL) and low (LWL) wastewater loading. The results indicated that under LWL conditions, all ecosystems exhibited a higher reduction rate of ARG diversity and relative abundance (RS) compared to HWL conditions. The efficiency of all ecosystems in reducing ARG diversity and abundance followed the order: MS > VN > SP. The sul resistance gene exhibited the highest RS and was degraded most rapidly in all samples. Additionally, sulfadimidine concentrations significantly decreased under LWL conditions, which was significantly correlated with sul reduction. Chemical oxygen demand, total phosphorus, total nitrogen, ammonium nitrogen, and nitrate nitrogen were identified as key factors influencing bacterial and ARG profiles. The increase in rhizobial bacteria and decrease in aerobic denitrifying bacteria likely contributed significantly to ARGs removal. This study offers new insights into ARG removal by submerged macrophytes in CWs, emphasizing the role of wastewater loading and the potential of MS in enhancing ARG degradation. These findings enhance CW design and management to mitigate ARG contamination in wastewater.

01 Jun 2025·Separation and Purification Technology

Al-Fe dual-anode peroxi-coagulation as a feasible pre-treatment process for refractory landfill leachate wastewater: Performance and collaborative mechanism

Author: Sun, Jiangli ; Li, Shasha ; Chen, Yujie ; Zhou, Minghua ; Zhang, Yican ; Xia, Zehua ; Liu, Jingyang ; Li, Yang ; Zhang, Hanyue ; Wang, Chunhua ; Zhang, Jiatong ; Zhang, Chaohui

Landfill leachate has posed high requirements for treatment due to its complex water quality, while peroxi-coagulation (PC) is considered to be a promising alternative to remove refractory organic pollutants.However, it still faces the challenge of low mineralization and high sludge productionHerein the PC with Al-Fe double anodes, natural air diffusion electrode (NADE) and modified carbon felt (MCF) cathode (PC_Al-Fe), were used to pretreat the landfill leachate.Under the conditions of initial pH 6.0, current densities of 3.3 mA/cm² (NADE/Al) and 1 mA/cm² (MCF/Fe), the removal efficiency of total organic carbon (TOC), total nitrogen (TN), UV₂₅₄ and color at 180 min were 61.8%, 47.35%, 95.90% and 97.33%, resp., while the elec. energy consumption was only 0.754 kWh/kg TOC.Compared with the traditional PC process, the TOC removal efficiency and rate were increased by nearly 50% and 55.7%.The enhancement of the removal efficiency was due to the higher production of hydroxyl radicals (•OH) and superoxide radicals (O^•-₂) in the PCAl Fe system, which enhanced the mineralization.On the other hand, the dual coagulation of Al-Fe promoted the high polymerization transformation of Al/Fe components in the hydrolysis products, improving the coagulation process greatly.In addition, it was found that the synergistic effect of Al-Fe dual coagulation and oxidation was also an important reason for the improvement of contaminant removal.All results suggested that PCAl-Fe process was a promising and more cost-effective method for the pre-treatment of landfill leachate.

01 Jun 2025·Separation and Purification Technology

Thiol-yne click postsynthesis of imidazole-functionalized cyclodextrin microporous organic network: A remarkable adsorbent for sulfonamide antibiotics

Author: Yang, Cheng-Xiong ; Wang, Ting ; Yue, Yun-Da ; Cui, Yuan-Yuan

Sulfonamides (SAs) are widely used broad-spectrum antibiotics for treating infections.However, their inevitable residues pose serious threats to human health and agroecosystems.Hence, reasonable design and synthesis efficient adsorbents to remove residual SAs from the environment are crucial and highly desired.In this study, a novel imidazole-functionalized cyclodextrin-based microporous organic network (α-CD-MON-BZ) was designed and synthesized through the specific thiol-yne click post-modification for the efficient removal of SAs.The prepared α-CD-MON-BZ exhibited ultrafast adsorption kinetics (<3 min) and an exceptionally high saturation adsorption capacity (571.4 mg/g) for sulfamethoxypyridazine (SMP).This capacity was much higher than those of other reported adsorbents.Fourier transform IR spectroscopy, XPS, and d. functional theory calculations revealed that the adsorption process involves hydrophobic, π-π, hydrogen bonding, host-guest, and electrostatic interactions.Furthermore, α-CD-MON-BZ exhibited favorable reusability and selectivity.This study introduces a new method to construct novel functionalized CD-MONs for highly efficient SAs removal and promotes the design and applications of such materials in contaminant removal.

100 Deals associated with Sulfamethazine

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KEGG	Wiki	ATC	Drug Bank
D02436	Sulfamethazine	J01EB03	DB01582

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Indication	Country/Location	Organization	Date
Meningitis, Meningococcal	China	-	01 Jan 1980
Pneumococcal Infections	China	-	01 Jan 1980
Streptococcal Infections	China	-	01 Jan 1980

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