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PubMed Journal Database | Huan jing ke xue= Huanjing kexue RSS

06:42 EDT 26th March 2019 | BioPortfolio

The US National Library of Medicine and National Institutes of Health manage PubMed.gov which comprises of more than 29 million records, papers, reports for biomedical literature, including MEDLINE, life science and medical journals, articles, reviews, reports and  books.

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For example view all recent relevant publications on Epigenetics and associated publications and clincial trials.

Showing PubMed Articles 1–25 of 565 from Huan jing ke xue= Huanjing kexue

Characteristics of Nitrogen and Phosphorus Output in Runoff and Rainfall Runoff in Lanlingxi Watershed, Three Gorges Reservoir Area.

The small watershed of an agroforestry system in the Lanlingxi watershed in the Three Gorges Reservoir area was studied by performing continuous monitoring of nitrogen and phosphorus output and concentrations and analyzing the changes in the output of nitrogen and phosphorus in runoff and its response to different rainfall conditions. The results showed that:①The total runoff loss was 50.92×10 m in this watershed during the rainy season, with 52.43 kg·hm lost by total nitrogen, including nitrate nitroge...

Screening Method of Priority Control Pollutants in Groundwater Based on Contamination Assessment.

Screening of priority control pollutants is an effective technical means for environmental management and environmental quality protection. Quick and efficient identification of pollutants is useful when attempting to prevent and control groundwater pollution. In order to explore a screening system for a set of priority pollutants that can be applied to regions with weak basic information, a screening method of priority pollutants based on contamination assessment is put forward in this paper. Based on the ...

Effect of Sulfur to Quartz Sand Ratios on the Removal of High-Concentration Perchlorate in Packed-Bed Reactors.

Three autotrophic packed-bed reactors, each with a different sulfur/quartz sand ratio(R1, 2:1; R2, 1:1; R3, 1:2,)were used to remove high-concentration perchlorate from contaminated water. The perchlorate removal efficiency, kinetics, and biofilm of the reactors were studied using different perchlorate concentrations and hydraulic retention times (HRTs). The perchlorate removal efficiency decreased with higher perchlorate concentration and shorter HRT, and the removal efficiency of R1 was higher than of R2 ...

Adsorption of Methylene Blue and Cu(Ⅱ) by Activated Carbon/Macromolecule Composite Hydrogel.

Activated carbon/alginate/poly(vinyl alcohol) composite macromolecule hydrogels (CAP) were prepared as adsorbents to study their adsorption performance for methylene blue (MB) and Cu in aqueous solution. The effect of dosage, pH, temperature, contact time, and initial concentrations of MB and Cu on the adsorption process was investigated. SEM, FTIR, and BET analyses were conducted to identify the physicochemical properties of CAP. The results indicated that activated carbon was successfully loaded into the ...

Adsorption Performance and Mechanism of HZO@SGH for the Removal of Fluoride from Aqueous Solution.

Three-dimensional porous composites based on hydrous zirconium oxide and self-assembled graphene hydrogels (HZO@SGH) were successfully synthesized via homogeneous precipitation. HZO@SGH was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) to investigate the morphology and the defluoridation mechanism. The adsorption performance and mechanism of HZO@SGH for fluoride was investigated via bat...

Mechanism of MgO/GAC Catalyzed Ozonation of Organic Compounds.

MgO/granular activated carbon (MgO/GAC-1) was prepared via an impregnation method, and its activity in ozonation of diuron and acetic acid was investigated. MgO/GAC-1 was also compared in stability to the same catalyst prepared via precipitation according to the literature (MgO/GAC-2). The results showed that MgO/GAC-1 could increase efficiency of ozonation by 15%-35% in the process of degradation of diuron and acetic acid. When the pH of the solution was neutral or alkaline, MgO/GAC-1 could effectively ret...

Ozonation Characteristics of Low Coagulability Organic Matter from the Secondary Effluent of WWTPs.

The aim of this study was to investigate the effectiveness of ozonation on the removal of organic matter with low coagulability from municipal secondary effluent. The results revealed that the removal efficiency of coagulation generally remained quite low. The residual organic matter belonged to low coagulability organic matter. The presence of the ozone increased the removal efficiency of color and UV gradually for low coagulability organic matter, whereas DOC had no noticeable change; the efficiencies wer...

Quantitative Analysis of Dominant Pollutants in Secondary Effluent via Dye Probe Technology.

The linear relationship between the concentration of either bovine serum albumin (BSA) or sodium alginate (SA) and the intensity of a resonance light scattering (RLS) spectrum was established by using Congo red and neutral red as the dye probes, respectively. Moreover, the linear relationship between the concentration of humic acids (HA) and UV absorbance was determined by using toluidine blue (TB) as the dye probe. The detection of concentration range and the pH value of three kinds of standard substances ...

Lab-scale ANAMMOX Process in a Wastewater Treatment Plant.

A lab-scale, completely anaerobic ammonium oxidation (ANAMMOX) process was operated in a municipal wastewater treatment plant (WWTP). Sewage effluent treated by an A/O process and nitrification process was input as the substance to start up the up-flow ANAMMOX filter reactor. After the 109 day, the ammonia removal rate and nitrite removal rate were greater than 90% for 15 successive days and the nitrogen removal rate was higher than 70%. The ANAMMOX filter reactor successfully started up. From days 245 to 3...

Effect of Aeration Rate on Shortcut Nitrification Recovery in Intermittent Aeration Mode.

Shortcut nitrification sludge, which was set aside for two months, was recovered using Reactors Ⅰ, Ⅱ, Ⅲ, and Ⅳ. The aeration rates of Reactors Ⅰ, Ⅱ, Ⅲ, and Ⅳ were 120, 100, 80, and 60 L·h, respectively, while treating real domestic sewage, and the ratio of aerobic/anoxic was 30 min/30 min at the temperature of 25℃. The influent of ammonia was 50-80 mg·L, and the concentration of effluent ammonia was stable, at below 5 mg·L, after the 12, 18, 21, and 21 cycles. The removal ratio of ammon...

Effect of Aerobic/Phosphorus Granules on Start-up of Partial Nitrification Granular Sludge.

The different effects of additional aerobic granules (AGs) and phosphorus removal granules (PRGs) on the start-up and stable operation of partial nitrification granular sludge (PNGS) were compared at room temperature(22-28℃). The results showed that in the first stage (days 0-22), partial nitrification was accomplished on day 19 for the three reactors (R1, R2, and R3). In the second stage (days 23-56), 20% AGs and 20% PRGs were added to R2 and R3 to induce PNGS. The start-up of the granules of the three r...

Microbial Communities and Sludge Specific Resistance in Two SBRs Treating Leachate.

The relationship between microbial populations and sludge filtration performance was studied when active sludge was used to treat the leachate from municipal solid waste incineration plants. Two SBRs (SBR1 and SBR2) were operated at the same conditions, except that SBR1 was exposed to the sunlight and SBR2 was in the dark. To identify the difference in microbial populations in two reactors, high-throughput sequencing method was used. On the 50 day, the fungi abundance in SBR2 was higher than in SBR1. Phylum...

Sources and Risk Assessment of Polycyclic Aromatic Hydrocarbons from the Urbanization Process of Topsoil.

To study the effects of urbanization on concentration, sources, and health risks of polycyclic aromatic hydrocarbons (PAHs), 95 topsoil samples were collected from Liaoning Province. For this assessment, 21 PAHs were analyzed via gas chromatography-mass spectrometry and discussed. The results show the total concentrations of the 21 PAHs in background, Shen-Fu, Shen-Yang, and Fu-Shun were 1496.76 μg·kg, 3000.50 μg·kg, 8705.11 μg·kg, and 8178.90 μg·kg, respectively, which is positively correlated with...

Spatial Variability and Contamination of Arsenic in Soils of Xijiang River Basin.

In this study, 2585 soil samples were collected in the Xijiang River Basin in Guangxi Zhuang Autonomous Region and the spatial variability and contamination of Arsenic in soils were evaluated using geostatistical and GIS tools. The results showed that the concentrations of As in surface soils (23.82 mg·kg) were higher than the background values of the Guangxi and Xijiang Rivers in natural soils; the upstream values (Diaojiang River and Huanjiang River) (30.22 mg·kg) were significantly higher than those in...

Characterization of Phosphorus in Urban Surface Soils in Kaifeng City and Its Risk of Loss.

Characterization of phosphorus (P) and its risk of loss in urban soils in Kaifeng City, Henan Province were studied through field sampling and laboratory experiments. The spatial distribution of P and the map of risk of loss were obtained using geostatistical and spatial analysis techniques. The P content in urban soils ranged from 400 to 1427 mg·kg, the proportions of inorganic P in total P ranged from 65% to 99%, and Olsen-P and CaCl-P in soils were 3.41-115.03 mg·kg and 0.01-9.40 mg·kg, respectively. ...

Distribution Characteristics and Health Risk Assessment of Heavy Metals in a Soil-Rice System in an E-waste Dismantling Area.

This study selected Guiyu Town, Guangdong Province as the research area, the content of 15 kinds of metals (As, Be, Cd, Co, Cr, Cu, Hg, Li, Mn, Ni, Sb, Sn, Pb, V, and Zn) in the soil was determined, and the content of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn in the rice of this research area was identified. Multivariate statistical analysis and a human health risk assessment model were used to investigate the distribution characteristics and health risk of heavy metals in a soil-rice system. The res...

Residue Levels and Health Risk Assessment of Organochlorine Pesticides in Rice from Shanghai.

As one of the main producers and consumers of pesticides in the world, China has historically used large quantities of organochlorine pesticides, such as DDT and HCH. Rice is a staple food crop in Shanghai, where the Qingpu and Chongming districts are two important rice planting areas. This study detected the residue levels of 24 organochlorine pesticides (OCPs) in rice samples collected from Qingpu and Chongming in Shanghai. The composition and health risk of OCPs in rice samples were investigated. The res...

Effects of Tetracycline Antibiotics on Growth and Characteristics of Enrichment and Transformation in Two Vegetables.

Pot experiments were carried out to study different levels (0, 50, and 150 mg·kg) of three tetracycline antibiotics[tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC)] on the growth, concentration of tetracycline antibiotics, and their characteristics of enrichment and transformation in two kinds of vegetables (lettuce and Chinese cabbage). The results showed that the fresh weight of shoots and roots of lettuce decreased by 1.56%-26.84% and 17.36%-51.04%, respectively, when exposed to te...

Bioavailability of Silicon Fertilizer Coupled Water Management on Soil Bioavailability and Cumulative Control of Rice in Compound Contaminated Paddy Soils.

The effect of wet irrigation (CK), agronomic measure flooding (WF), instantaneous silicon fertilizer combined with flooding measures (FYsi), mineral silicon fertilizer combined with flooding measures (FKsi), and a mix of two kinds of silicon fertilizer combined with flooding measures (FYK) on the bio-availability of As and Cd in soil and the accumulation of As and Cd in rice were investigated by pot experiments. The results showed that the pH of the soils combined with flooding measures was increased by 0.1...

Liver and Kidney Function of E-waste Dismantling Workers and Potential Influencing Factors.

High levels of exposure to heavy metals and persistent organic pollutants (POPs) by e-waste dismantling workers has attracted increasing attention, but the health conditions of the workers are seldom reported. The liver and kidney functions of the workers were studied by comparing the blood indicators of the worker group with those of the control group. Moreover, factors affecting the liver and kidney functions, such as the sexuality, age, and working time, were identified using correlation analysis. The ra...

Evaluation and Development of a Weighing Chamber by Using Saturated MgCl Solution.

In recent years, China has suffered a lot from atmospheric particles. Many studies of particles are based on filters. As a result, the accuracy of filter weighing is of great importance. A weighing chamber (1.2 m×0.6 m×0.8 m) was developed and evaluated using saturated MgCl solution with a self-made flow control system to maintain constant relative humidity (RH). By evaluating the mass change of blank and aerosol-enriched filters after weighing in different RH, we selected RH of 30%-40% as the range for t...

Characteristics Research on Carbonaceous Component of Particulate Matter Emitted from Iron and Steel Industry.

In order to investigate the carbonaceous characteristics of particles emitted from the iron and steel industry, an electrical low-pressure impactor (ELPI) was used to collect three sets of samples from the sintering process and one set of samples from the ironmaking process emissions of particulate matters. Organic carbon (OC) and elemental carbon (EC), which were divided into seven carbonaceous components based on the temperature of the particulate matter, were analyzed using a thermal-light reflection met...

Pollution Characteristics and Source Identification of PAHs in Atmospheric PM in Changzhou City.

A total of 55 ambient fine particle (PM) samples were collected in Changzhou City from January to August 2016. The concentrations of 17 PM-bound PAHs in the samples were analyzed by GC-MS. Results showed that seasonal average mass concentrations of PAHs in winter, spring, and summer were 140.24, 41.42, and 2.96 ng·m, respectively, which indicating that the pollution of PAHs in winter appeared more serious than in the other two seasons, and 4-6-ring high molecular weight PAHs were predominant in all three s...

Atmospheric Dry Deposition Fluxes and Sources of Polycyclic Aromatic Hydrocarbons in Lanzhou Valley, Northwest China.

The atmospheric dry deposition flux pollution levels were determined and the sources apportioned for 15 US EPA priority polycyclic aromatic hydrocarbons (PAHs) collected at 13 sampling sites in the Lanzhou valley using passive sampling techniques. The results are as follows. The annual atmospheric dry deposition fluxes ranged from 7.48 to 53.94 μg·(m·d), with a mean of 18.65 μg·(m·d). The highest flux levels for both the heating and non-heating seasons, 60.85 μg·(m·d) and 47.03 μg·(m·d), respect...

Characteristics and Sources of Elements in Atmospheric Dust Fall in Zhuzhou City, Central China.

To study the concentration characteristics as well as sources of elements and heavy metal pollution in atmospheric dust fall in Zhuzhou City, 144 samples from 12 sites in the Zhuzhou urban area were collected from January to December in 2012 and 28 kinds of elements in the samples were analyzed. The results showed that the dust fall quantities of the industrial areas and mixed commercial and residential (MCR) areas were, respectively, 89.46 g·m and 33.20 g·m and the range of all sample points was 23.14-11...


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