Identifying unknown antibiotics with persistent and bioaccumulative properties and ecological risk in river water in Beijing,China

Environmental Science and Pollution Research - The goal of this study was to identify antibiotics with potential risk in river water of the megacity Beijing, China. This was accomplished by using a...     

Study of uncertainty of satellite and reanalysis precipitation products and their impact on hydrological simulation

Environmental Science and Pollution Research - Satellite and reanalysis precipitation products are potential alternatives in hydrological studies, and it is very important to evaluate their...     

Adsorption behaviours and transfer simulation of levofloxacin in silty clay

Fluoroquinolone antibiotics in soil can cause serious antibiotic pollution. Adsorption is the main factor that influences their destination and transport of antibiotics. Therefore, research on the behaviour of antibiotics once they reach the soil environment is meaningful to design appropriate measures to reduce their potential risks. This research took levofloxacin (LVFX) as the research object and used a static adsorption experiment to study the adsorption behaviour of the vadose zone of silty clay on the North China Plain. The results showed that LVFX had high retention in silty clay, with an average adsorption ratio of more than 90%. Adsorption of LVFX on silty clay reached equilibrium in 24 h with an adsorption amount of 93.5 mg/kg at an initial LVFX concentration of 10 mg/L. Acidity, cations and soil organic matter could affect the adsorption of LVFX, with adsorption variation ratio of 3.3%, 3.4% and 0.6%, respectively. In addition, numerical simulation with Hydrus-1D was utilized, and the results show that LVFX may infiltrate into underground water through silty clay after 28 days and completely penetrate in 100 days.

     

Determining the origin and fate of nitrate in the Nanyang Basin,Central China,using environmental isotopes and the Bayesian mixing model

Environmental Science and Pollution Research - Identifying sources of nitrate contamination has been a long-term challenge in areas with different land uses. We investigated the biogeochemical...     

Comparison analysis on simultaneous decolorization of Congo red and electricity generation in microbial fuel cell (MFC) with l-threonine-/conductive polymer-modified anodes

Environmental Science and Pollution Research - l-Threonine and three kinds of conductive polymers were applied for anode modification in microbial fuel cells (MFCs) for decolorization of Congo red...     

Construction safety: an analysis of the cross-influence of economic,construction, and accident death factors

Environmental Science and Pollution Research - To explore the relations between the number of accident deaths (NCD) and various factors in construction safety, a multiple linear regression model...     

Characterization, reactivity, source apportionment, and potential source areas of ambient volatile organic compounds in a typical tropical city

Based on one-year observation, the concentration, sources, and potential source areas of volatile organic compounds (VOCs) were comprehensively analyzed to investigate the pollution characteristics of ambient VOCs in Haikou, China. The results showed that the annual average concentration of total VOCs (TVOCs) was 11.4 ppbV, and the composition was dominated by alkanes (8.2 ppbV, 71.4%) and alkenes (1.3 ppbV, 20.5%). The diurnal variation in the concentration of dominant VOC species showed a distinct bimodal distribution with peaks in the morning and evening. The greatest contribution to ozone formation potential (OFP) was made by alkenes (51.6%), followed by alkanes (27.2%). The concentrations of VOCs and nitrogen dioxide (NO₂) in spring and summer were low, and it was difficult to generate high ozone (O₃) concentrations through photochemical reactions. The significant increase in O₃ concentrations in autumn and winter was mainly related to the transmission of pollutants from the northeast. Traffic sources (40.1%), industrial sources (19.4%), combustion sources (18.6%), solvent usage sources (15.5%) and plant sources (6.4%) were identified as major sources of VOCs through the positive matrix factorization (PMF) model. The southeastern coastal areas of China were identified as major potential source areas of VOCs through the potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) models. Overall, the concentration of ambient VOCs in Haikou was strongly influenced by traffic sources and long-distance transport, and the control of VOCs emitted from vehicles should be strengthened to reduce the active species of ambient VOCs in Haikou, thereby reducing the generation of O₃.     

罐区灾害场景建模及应急处置仿真实训系统研究

针对目前应急消防训练中事故场景感知性、交互性不足等问题,研究了罐区灾害场场景建模方法及人体伤害建模方法,研发了基于可穿戴式体感装备的虚拟现实应急处置实训系统,构建了虚实结合的危险化学品火灾事故应急救援仿真训练环境,使应急人员能够最大程度地贴近实战环境,完成仿真训练,提高标准化操作能力及事故应急处置能力。     

Nutrients regeneration pathway, release potential, transformation pattern and algal utilization strategies jointly drove cyanobacterial growth and their succession

In order to better understand the contribution of nutrients regeneration pathway, release potential and transformation pattern to cyanobacterial growth and succession, 7 sampling sites in Lake Chaohu with different bloom degree were studied every two months from February to November 2018. The carbon, nitrogen (N) and phosphorus (P) forms or fractions in surface, interstitial water and sediments as well as extracellular enzymatic activities, P sorption, specific microbial abundance and community composition in sediments were analyzed. P regeneration pathway was dominated by iron-bound P desorption and phosphorus-solubilizing bacteria solubilization in severe-bloom and slight-bloom area respectively, which both resulted in high soluble reactive phosphorus (SRP) accumulation in interstitial water. However, in severe-bloom area, higher P release potential caused the strong P release and algal growth, compared to slight-bloom area. In spring, P limitation and N selective assimilation of Dolichospermum facilitated nitrate accumulation in surface water, which provided enough N source for the initiation of Microcystis bloom. In summer, the accumulated organic N in Dolichospermum cells during its bloom was re-mineralized as ammonium to replenish N source for the sustainable development of Microcystis bloom. Furthermore, SRP continuous release led to the replacement of Dolichospermum by Microcystis with the advantage of P quick utilization, transport and storage. Taken together, the succession from Dolichospermum to Microcystis was due to both the different forms of N and P in water column mediated by different regeneration and transformation pathways as well as release potential, and algal N and P utilization strategies.     

危险化学品事故现场体感式训练装备与系统设计

针对危险化学品事故实战化训练存在事故现场感不足、无法满足近似实战化的训练需要等问题,在典型最坏场景构建及风险分析基础上,研究危险化学品事故动态可视化与参数化表达方法,利用体感交互设计模型以及事故动态可视化技术,研究事故现场信息的融合及多感知参数化数据共享技术,建立危险化学品事故现场体感式训练装备与系统,再通过危险化学品事故应急救援人员模拟训练综合评估指标体系与综合评估算法,验证了装备和系统的可行性和适用性,为危险化学品事故现场体感式训练提供了新的思路与手段。