WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 94
·期 1
·e1670
·
IF 1.946
Haidong Zhou,Jinyu Cui,Xin Li,Yadan Wangjin,Lidan Pang,Mengwei Li,Xiaomeng Chen
The behavior and removal of six antibiotics, that is, azithromycin, clarithromycin, sulfathiazole, sulfamethoxazole, ciprofloxacin, and tetracycline, in an artificial-controllable urban river (ACUR) were investigated. The ACUR was constructed to form five artificial eco-systems by planting three emergent hydrophytes and Microcystis aeruginosa : (1) Control; (2) MA: M. aeruginosa only; (3) MA-J-C: M. aeruginosa combined with Juncus effusus and Cyperus alternifolius ; (4) MA-C-A: M. aeruginosa combined with C. alternifolius and Acorus calamus L.; (5) MA-A-J: M. aeruginosa combined with A. calamus L. and J. effusus . The MA-C-A system achieved the best removal of azithromycin and clarithromycin after 15-day test with the final concentrations 0.92 and 0.83 μg/L. The contents of ciprofloxacin and tetracycline in sediment were highest, up to 1453 and 1745 ng/g. The antibiotic plant bioaccumulation was higher in roots rather than the shoots (stem and leaves). No target antibiotics were detected in algae cells. The combination of hybrid hydrophytes had a certain effect on the removal of antibiotics, and thus selecting appropriate hydrophytes in urban rivers could greatly improve water quality. The overall removal of six antibiotics was greatly improved by the ACUR containing the hybrid hydrophytes and the algae, indicating a synergistic effect on antibiotic removal. Practitioner points Controllable-mobile artificial eco-systems were developed with emergent hydrophytes and M. aeruginosa . The M. aeruginosa + Cyperus alternifolius + Acorus calamus L. system removed azithromycin and clarithromycin most at the end of tests. Emergent hydrophytes and M. aeruginosa have a synergistic effect on the removal of antibiotics. The combination of emergent hydrophytes did play an important role in the removal of antibiotics. The artificial eco-systems containing the hybrid hydrophytes and the algae could greatly improve the overall removal of antibiotics.
研究领域:
环境科学
·
生态学
·
微生物学
✓ 已验证
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Chengcheng Liu,Rui Chen,Fengmao Liu,Zhiqiang Gao,Xiaohan Li,Yue Wang,Shiyu Wang,Yuyan Li
Grapes' growth and processing conditions have various effects on pesticides with different physicochemical properties. Therefore, it is important for the healthy human diet to investigate pesticide residue behavior. To explore the relationship between pesticide residue behavior and physicochemical properties, the distribution of ten pesticides and one metabolite on grape peel and pulp was examined and the results showed that pesticides with low octanol–water partition coefficient (Kow) were more likely to be transferred to the pulp as the harvest interval increases. The removal methods were ranked according to pesticide removal effectiveness as follows: peeling > ozone water washing > tap water washing. Furthermore, the logKow played a key role in pesticide transfer rates during the juicing and winemaking. Notably, drying was the process of increasing pesticide residues. Additionally, the prediction models for the PFs of the pesticides in the juicing and winemaking processes were constructed as PFj = 0.952–0.116logKow (r = 0.886) and PFw = 0.736–0.143logKow (r = 0.959) by stepwise regression analysis. The prediction models recommended that Kow could be used to predict pesticide residues in grape juice and wine, which can predict the effect of pesticide physicochemical properties on PFs.
研究领域:
食品科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Pollutants and Bioavailability
·
2020
·
IF 0
Jian Shen,Xueying Li,Xinze Wang,Jimeng Feng,Shiyi Jiang,Zhiping Zhang,Qian Xu
The Erhai Lake basin dominated by agricultural production had a total sewage interception system and was selected as the study area. Survey data showed the total steroid estrogens (SEs) production was 55.97 kg/year (EEQ-E2β) in the whole basin and the main source of SEs was swine breeding (57%). The results indicated that unsatisfactory removal effect of SEs could be related to insufficient influent carbon sources as a result of the total sewage collection. The observed average concentrations of E1, E2α, E2β, E3 and EE2 in rivers/ditches were 25.9 ng/L, 43.5 ng/L, 14.4 ng/L, 49.4 ng/L and 24.5 ng/L, and SEs in ditches were significantly higher than that in rivers, proving the influence of the irrigation tailwater. Above, the annual SEs contribution for Erhai Lake was estimated, and the correlation coefficient of SEs and water quality of inflow rivers/ditches indicated that SEs had a certain correlation with nitrogen.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Shaojuan Yan,Jianhua Qu,Fuxuan Bi,Shuqi Wei,Siqi Wang,Zhao Jiang,Lei Wang,Hongwen Yu,Ying Zhang
KOH-activated N -doped hydrochar (KHCN) was synthesized via co-activation method to eliminate atrazine (AT) in water efficiently. Compared to primitive HC, KHCN had advantages of splendid specific surface area (1205.82 m 2 /g) and developed microsphere structures on the surface. Specially for KHCN, the extra melamine added strengthened and preserved partial structure of polar oxygen-containing groups that were decomposed in the process of pore making. Besides, the estimated uptake amount of AT onto KHCN (216.50 mg/g) was remarkably superior to KHC (114.25 mg/g). KHCN exhibited the pH-dependence for AT removal, and presented excellent uptake capacity at a relatively neutral environment. Notably, the proposed mechanisms for AT removal by KHCN included electrostatic attraction, pore filling, π-π EDA, H-bond as well as hydrophilic effect. Hence, the porous N -doped hydrochar was a kind of adsorbent which was easy to prepare and had the application prospect for AT removal in natural water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 12
·1-13
·
IF 2.278
Tan Lei,Liang Bin,Fang Zhanqiang,Xie Yingying,Tsang Eric Pokeung
E-waste sites are one of the main sources of the pollutant decabromodiphenyl ether (BDE209); contaminated farmland and water bodies urgently need to be remediated. As a potential in situ remediation technology, nano zero-valent iron (nZVI) technology effectively removes PBDEs. However, the humic acid (HA) and heavy metals in the contaminated sites affect the remediation effects. In this study, we explored the influence of HA and transition metals on the removal of PBDEs by nZVI. The specific surface area and average size of the nZVI particles we prepared were 35 m 2 /g and 50–80 nm, respectively. The results showed that HA inhibited the removal of PBDEs; as the concentration of HA increased, its inhibitory effect intensified and the k
obs decreased. However, the three metal ions (Cu 2+ , Co 2+ , and Ni 2+ ) enhanced the removal of PBDEs. The enhancement effect was followed the order Ni 2+ > Cu 2+ > Co 2+ . As the concentration of metal ions increased, the promotion effect improved. The synergistic effect of HA and the metal ions was manifested in the combination of the inhibitory effect and the enhancement effect. The values of the first-order kinetic constants ( k
obs ) under the combined effect were between the values of the rate constants under the individual components. The inhibitory mechanism was the chemisorption of HA, i.e., the benzene carboxylic and phenolic hydroxyl groups in HA occupied the surfactant reactive sites of nZVI, thus inhibiting the removal of BDE209. The promotion mechanism of Cu 2+ , Co 2+ , and Ni 2+ can be explained by their reduction to zero valence on the nZVI surface; furthermore, Ni 2+ strongly affects the debromination and dehydrogenation of BDE209, leading to a stronger promotability than Cu 2+ or Co 2+ .
研究领域:
环境科学
·
污染修复
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xishou Guo,Shu Jiang,Yanrui Wang,Yuanxin Wang,Jinlong Wang,Tianyin Huang,Heng Liang,Xiaobin Tang
Gravity-driven membrane (GDM) filtration is a promising technology for decentralized water and wastewater treatment due to its negligible energy consumption and low maintenance. This study investigated the flux development and permeate quality of the GDM process in treating the secondary effluent, as well as the influences of two practical pre-treatments, including GAC filter and microfiltration (MF), on its filtration performance. The results indicated that the GAC filter could significantly enhance the removal of organic contaminants (i.e., DOC, UV 254 , and fluorescent substances), with an average removal of 70 % for DOC and 80 % for UV 254 , respectively. Meanwhile, GAC/GDM systems exhibited a superior removal performance of manganese and sulfamethoxazole (SMX) for more than 95 % and 80 %, respectively. Furthermore, the optimized mixing ratio between GAC permeates and secondary effluent was 7:3 (GAC7:3) to reach a flux level close to the GDM control and achieve a superior permeate water quality than the other processes. The flux of GDM control could stabilize at the level of 5.47 ± 0.71 L m −2 h −1 during long-term filtration. Unexpectedly, limited flux improvements were observed with the pre-treatments, and the stable flux of GAC/GDM and MF/GDM was close to or slightly lower than the GDM control. In GDM control, a rough, heterogeneous, and porous biocake layer was observed on the membrane surface. By contrast, the cake layer structures in the GDM system coupled with pre-treatments appeared denser, compact, and homogeneous, resulting in relatively lower stable flux relative to the GDM control. The economic assessment indicated that the optimized process of GAC7:3 showed a significant cost advantage in the small and medium-scale water reuse scenarios. These findings were beneficial to develop new energy-saving membrane-based technology for the reclamation of wastewater.
研究领域:
环境工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Huan-yu Tao,Jianghong Shi,Jiawei Zhang,Hui Ge,Xiaowei Liu,Xiao-yan Li
The city-river-reservoir system is an important system for safeguarding drinking water. Phthalic acid esters (PAEs) are emerging contaminants in drinking water sources that are gaining attention, and they could pose risks to human health and aquatic organisms. In this study, field studies that lasted four years were conducted to analyze the concentrations, spatial-temporal distribution, and removal effects of six PAEs. The total concentrations of the Σ6PAEs in the water and sediment samples were 0.2–7.4 μg L −1 (mean: 1.3 μg L −1 ) and 9.2–9594.1 ng g −1 (mean: 847.5 ng g −1 ), respectively. Di-n-butyl phthalate (DBP) and, bis(2-ethylhexyl) phthalate (DEHP) were the predominant congeners, accounting for 57.2 % in the water samples and 94.1 % in the sediment samples. The urban area contributed 72 % of the PAEs in the system. A significant removal effect of PAEs was observed in the wetland, with a removal rate of 40.2 %. The partitioning of PAEs between the water and sediment was attributed to the removal of dimethyl phthalate and diethyl phthalate that occurred during the water phase, while the removal of DBP and DEHP primarily occurred during the sediment phase. The ecological risk calculation based on the sensitivity distribution model indicated that DBP (HQ water = 0.19, HQ sediment = 0.46) and DEHP (HQ water = 0.20, HQ sediment = 0.13) possessed moderate risks according to some water and sediment samples. The ecological projects were verified to be effective engineering strategies to reduce ecological risk in the drinking water source.
研究领域:
环境科学
·
生态学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）