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Lihua Li,Xuanyu Shen,Jiabei Liu,Wentao Li,Chuheng Zhong,Xinlong Zhou 대한토목학회 2023 KSCE JOURNAL OF CIVIL ENGINEERING Vol.27 No.2
For reusing the construction and demolition waste (C&DW) materials and solving waterloggingproblems, the feasibility of applying C&DW to the permeable pavement (PP) was investigated. The recycled brick aggregate (RBA) and recycled concrete aggregate (RCA) were used as PPbase materials under different mixing ratios and grades. Geotextiles were also used in thisstudy as filter contaminants. Modified compaction tests, rainfall model tests, and columnleaching tests were conducted on a total of 15 samples with three gradations and five RBA andRCA mix ratios. The specimens for the rainfall model test were compacted at around optimummoisture content, and the degree of compaction was 97%. Using the sub-layer compactionmethod, each group of samples is compacted in five layers in strict accordance with thespecifications. In general, C&DW has the potential to be used underground without pollutionto the groundwater. The heavy metal concentrations in C&DW are less than in the local soiland related to material resources. The water yield performance was the best when 100%concrete was used to build PP, and the total water storage was the most when 100% of brickswere chosen to make PP. Due to the excellent permeability, C&DW can be selected forpavement fillers. The geotextile reduces the permeability by about 13% but effectively filtersout more than 50% of the fine particles in the rainfall. The permeability performance ofconcrete aggregates may be better than that of bricks, and fine particles can reduce thepermeability.
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2019 Novel Coronavirus (COVID-19) Pneumonia: Serial Computed Tomography Findings
Jiangping Wei,Huaxiang Xu,Jingliang Xiong,Qinglin Shen,Bing Fan,Chenglong Ye,Wentao Dong,Fangfang Hu 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.4
From December 2019, Coronavirus disease 2019 (COVID-19) pneumonia (formerly known as the 2019 novel Coronavirus [2019nCoV]) broke out in Wuhan, China. In this study, we present serial CT findings in a 40-year-old female patient with COVID-19 pneumonia who presented with the symptoms of fever, chest tightness, and fatigue. She was diagnosed with COVID-19 infection confirmed by real-time reverse-transcriptase-polymerase chain reaction. CT showed rapidly progressing peripheral consolidations and ground-glass opacities in both lungs. After treatment, the lesions were shown to be almost absorbed leaving the fibrous lesions.
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Yamin Hong,Xiupeng Yue,Yaping Zhang,Kai Shen,Wentao Jiao,Lei Zhao,Beibei Li 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3
Sulfate radical-based advanced oxidation processes have been applied in the remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil, during which sulfate can be activated in different ways. In this work, effects of four different ways (FeSO4, NaOH, H2O2, and Heat) activated sodium persulfate (PS) on PAHs removal and soil physicochemical properties (pH, organic matter, functional groups, surface morphology, and partial heavy metal elements) were compared, and the influencing factors and mechanism of soil PAHs removal by thermally activated PS were also studied. The results showed that at the dosage of 3% of persulfate, the removal efficiency of PAHs followed the sequences of Heat (91.4%) > FeSO4 (86.6%) > H2O2 (86.2%) > NaOH (72.9%). However, thermal activation decreased the soil pH and organic matter content more significantly than other treatments. The reaction tended to reach equilibrium at 6 h when the dosage of persulfate was 3% and the activation temperature was 60 °C, and the reaction obeyed pseudo-first-order kinetics. Through quenching experiments, it was found that the free radicals playing a dominant role in the oxidation process were sulfate radicals. Compared with pH, liquid to soil (L/S ratio) and the temperature had more significant impacts on the degradation efficiency of PAHs.
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Runhua Liao,Yan Li,Zhu Wang,Yu Miao,Ke Shen,Peng Shi,Yan Ma,Wentao Li,Aimin Li 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
The treatment of high-salinity, high-nitratewastewater was investigated in a single expanded granularsludge bed reactor. Complete denitrification was achievedwhen nitrate concentration was as high as 6,000 mg N/Land the salinity of influent reached 11% NaCl at liquidup-flow velocity of 3.0 m/h, hydraulic retention time of,24 h and the C/N molar ratio of 2.0. Furthermore, 454-pyrosequencing technology was used to analyze archaeabacterial diversity under high salinity and high nitrateconditions. Results showed that the total number ofeffective sequences was 5749 consisting of 5678 bacterialsequences and 71 archaea sequences after denoising andfiltering out chimeras, which could be affiliated to 5phylogenetic groups, including Proteobacteria, Firmicutes,Euryarchaeota, Crenarchaeota and unclassified phylum. Although Proteobacteria was the dominant microbialpopulation, two archaea phylogenetic groups—Crenarchaeotaand Euryarchaeota were observed in this study.
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Adsorption of copper on iminodisuccinic acid modified attapulgite: characterization and mechanism
Qiuzi Zhu,Jianzhong Zhu,Meng Su,Liang Liu,Cunshi Wang,Dongliang Ji,Wangjun Bai,Wentao Shen 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.4
Heavy-metal ions are common pollutants in wastewater and are thus attracting considerable attention. Herein, an eco-friendly biodegradable adsorbent, iminodisuccinic acid (IDS) modified attapulgite (ATP) is prepared by graft-polymerization to reduce Cu(II) in water, referred as IDS-ATP. The equilibrium adsorption capacity of IDS-ATP for Cu(II) is increased by 329.5% and 272% compared with raw ATP and non-degradable chelator ethylenediaminetetraacetic acid-modified ATP (EDTA-ATP), respectively. Moreover, the adsorption capacities for Cu(II) in combined system increased by 186% compared with in single system. The structure and surface properties of IDS-ATP are characterized, demonstrating that the IDS moieties are anchored on the surface of ATP without structural damage. In the aqueous Cu(II) (64 mg /L), the best adsorption pH is 5.0, the best dosage is 800 mg/L, and the adsorption equilibrium time is 4 h. The adsorption of IDS-ATP is chemical adsorption and regenerated adsorbent still exhibits high adsorption capacity. The adsorption mechanism includes the coordination of amino groups with Cu(II), the chelation of -COOH on heavy metals (HMs), and the ion exchange. Taking Cu(II) as an example to study the process of IDS-ATP in water, it is beneficial to apply this degradable material to reduce the other HMs.
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