To investigate the occurrence of antimicrobials in final effluents from wastewater treatment plants (WWTPs) Canada, analytical methods were developed or modified previously described using solid-phase extraction followed by liquid chromatography−electrospray ionization tandem mass spectrometry. Thirty-one macrolide, quinolone, quinoxaline dioxide, sulfonamide, and tetracycline classes investigated (treated) eight WWTPs, located five Canadian cities. Ciprofloxacin, clarithromycin,...

Abstract Due to a growing interest in the occurrence of pharmaceutically active compounds (PhACs) and endocrine disrupting (EDCs) aquatic environment their potential impacts on humans environment, collaborative study was conducted these emerging contaminants effluents from wastewater treatment plants (WWTPs) drinking water supply system Calgary, Alberta. A number PhACs EDCs were detected WWTP effluents, at concentrations ranging ng/L low µ-g/L. Although generally removed during treatment,...

A four-wheel-independent-driving and four-wheel-independent-steering control coordination system is proposed by combining a system. The includes linear quadratic regulator controller that calculates four-wheel steering angles fuzzy logic parameter adjustor adjusts the parameters based on vehicle states. consists of three parts: proportional–integral–derivative for tracking desired speed, sliding mode controller, its corresponding torque distributor power-assisted steering. It particularly...

Pyrethroid insecticides are applied in the residential environment, as well agricultural crops, for insect control purpose. We developed and validated an accurate, sensitive, reproducible analytical method to simultaneously detect seven pyrethroid metabolites, namely, 3‐(2,2‐dichlorovinyl)‐2,2‐dimethyl‐(1‐cyclopropane) carboxylic acid, 3‐(2,2‐dibromovinyl)‐2,2‐dimethyl‐(1‐cyclopropane) 3‐phenoxybenzoic 4‐fluoro‐3‐phenoxybenzoic 2‐methyl‐3‐phenylbenzoic 4‐chloro‐α‐isoproply benzeneacetic...

Emission of nitrous oxide (N2O) during biological wastewater treatment is growing concern. This paper reports findings the effects carbon/nitrogen (C/N) ratio on N2O production rates in a laboratory-scale aerated filter (BAF) reactor, focusing biofilm nitrification. Polymerase chain reaction–denaturing gradient gel electrophoresis (PCR-DGGE) and microelectrode technology were utilized to evaluate mechanisms associated with using BAF. Results indicated that ability emission at C/N 2 was much...

To better predict and understand land–atmospheric interactions in the Tibetan Plateau (TP), we used Moderate Resolution Imaging Spectroradiometer (MODIS)-based land-use data MODIS-derived green vegetation fraction (GVF) to analyze variation trend over TP. The situ observations from six flux stations (“BJ” (the BJ site of Nagqu Station Climate Environment), “MAWORS” Muztagh Ata Westerly Observation Research Station), “NADORS” Ngari Desert “NAMORS” Nam Co Monitoring for Multisphere...

This study aimed to forecast the pattern of demand for hemorrhagic stroke healthcare services based on air quality and machine learning. Hemorrhagic stroke, quality, meteorological data 2016-2017 were obtained from Longquanyi District China, included 1932 cases. Six learning methods used considering seasonality a lag effect, average area under curve was as high 0.7971. Our results indicate that (1) performance forecasting during warm season is significantly better than in cold season, (2)...

Ammonia inhibition is a common phenomenon in biogas engineering which rich organic nitrogen substrate. anaerobic digestate slurry can be fixed by biochar adsorption. Biochar prepared from corn stalks and rice husks as raw materials at different temperatures (350℃, 450℃, 550℃). The purpose to explore the correlation between physical chemical structure of adsorption characteristics ammonia nitrogen. physicochemical properties were analyzed elemental analysis, FTIR, BET, etc., batch experiments...

Disinfection by-products (DBPs) have been monitored in Calgary's drinking water for approximately 15 years. The variability of the DBPs has typically exhibited similar patterns over period monitoring. Due to nature surface waters supplying treatment plants, level was largely influenced by runoff events where natural organic matter (NOM) increased, which characterized a relatively high total carbon (TOC) content. Principal component analysis (PCA) utilized this study quickly identify key...

摘要: 锶对植物光合作用影响尚未见系统研究报道。通过叶绿素荧光诱导动力学和光合气体交换参数详细研究了不同浓度的锶(1、5、10和20 mmol·L–1SrCl2)对油菜(Brassica napus)叶片光合作用的影响。荧光诱导动力学分析结果表明, 光系统II(PSII)的潜在活性(Fv/Fo)、实际光化学效率(Y(II))、表观光合电子传递速率(ETR)和光化学淬灭(qP)在低浓度(1和5 mmol·L–1)锶处理时显著上升, 在高浓度(10和20 mmol·L–1)锶处理时显著下降; 初始荧光强度(Fo)和非光化学淬灭(NPQ)在低浓度锶处理时变化不明显, 但在高浓度下显著上升。光合气体交换参数分析结果表明, 叶片的净光合速率(Pn)、蒸腾速率(Tr)在低浓度锶处理时显著上升, 而在高浓度锶处理时显著下降; 气孔导度(Gs)随锶处理浓度的增加一直呈显著下降趋势; 胞间CO2浓度(Ci)在低浓度锶处理时轻微下降, 高浓度锶处理时显著增加。此外, 叶绿素含量在低浓度锶处理时显著增加, 在高浓度处理时则显著下降。这些结果均表明, 低浓度锶处理可以改善油菜叶片的光合功能,...

Many marine bays have been polluted by various pollutants due to the rapid development of economic and population. Understanding transport processes in is essential pollution control. This paper analyzed Cd Jiaozhou Bay based on investigation data during 1979–1983. Results showed that major included terrestrial process, atmospheric process oceanic respectively. Furthermore, this provided block diagrams for these processes, which were determining migrating paths traces Cd.

Bisphenol A (BPA) is one of the environmental endocrine-disrupting chemicals used widely in common consumer products.There an increasing concern about human exposure to BPA, particularly fetuses, due potential adverse effects related estrogenic activity BPA.In assessing it essential have a sensitive, accurate and specific analytical method, for low BPA levels complex sample matrices.In this study, we developed validated accurate, robust liquid chromatography-mass spectrometry (LC-MS) method...