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Environment

Air concentrations of currently used herbicides and legacy compounds in the Canadian prairies, subarctic, and arctic
submitted by tkengon 26 minutes ago - Topic: Environment
Passive air samplers were installed in the summers of 2005 and 2007 for 90 days at four locations in the agricultural region of the Canadian Prairies and at five locations in the Canadian Subarctic and Arctic. The presence and masses of ten currently used herbicides and three legacy compounds in the polyurethane foam disks were quantified. Herbicides 2,4-D, bromoxynil and MCPA were detected at...



Rapid plant species loss at high rates and at low frequency of N addition in temperate steppe
submitted by csogimd 1 hour ago - Topic: Environment
Humans are both intentionally (fertilization) and unintentionally (atmospheric nutrient deposition) adding nutrients worldwide. Increasing availability of biologically reactive nitrogen (N) is one of the major drivers of plant species loss. It remains unclear, however, whether plant diversity will be equally reduced by inputs of reactive N coming from either small and frequent N deposition even...

Ocean warming, a rapid distributional shift and the hybridization of a coastal fish species
submitted by csogimd 1 hour ago - Topic: Environment
Despite increasing awareness of large-scale climate-driven distribution shifts in the marine environment, no study has linked rapid ocean warming to a shift in distribution and consequent hybridization of a marine fish species. This study describes rapid warming (0.8°C/decade) in the coastal waters of the Angola-Benguela Frontal Zone over the last three decades and a concomitant shift by a tem...

Treeline advances along the Urals mountain range – driven by improved winter conditions?
submitted by csogimd 1 hour ago - Topic: Environment
High-altitude treelines are temperature-limited vegetation boundaries, but little quantitative evidence exists about the impact of climate change on treelines in untouched areas of Russia. Here, we estimated how forest-tundra ecotones have changed during the last century along the Ural mountains. In the South, North, Sub-Polar and Polar Urals, we compared 450 historical and recent photographs a...

Ebullitive Methane Emissions from Oxygenated Wetland Streams
submitted by csogimd 1 hour ago - Topic: Environment
Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on em...



Linking inter-decadal changes in British river ecosystems to water quality and climatic dynamics
submitted by csogimd 1 hour ago - Topic: Environment
Macroinvertebrate communities in Western European rivers have changed substantially in recent decades. Understanding the causes is challenging because improvements in water quality have coincided with climatic variations over this period. Using data covering >2300 rivers and 21 years (1991–2011) across England and Wales, we analysed family-level distributions and nationwide trends in prevalen...

Cr(VI) adsorption on a thermoplastic feather keratin film
submitted by doasakm 2 hours ago - Topic: Environment
Feather is a kind of waste and hardly to be degraded in the environment. Thermoplastic film was made from feather by mechanical method with enhancing the temperature and pressure to 160°C, 5 MPa, respectively. Glycerol was added as plasticizer in various amounts in mass ratio of 10, 20, 40, 60, and 80%, respectively. During film preparation, influence glycerol content on film’s mechanical ...


Enhanced adsorption of methylene blue on modified silica gel: equilibrium, kinetic, and thermodynamic studies
submitted by doasakm 2 hours ago - Topic: Environment
The present work was undertaken to chemically modify silica gel (SG) with citric acid (CA) to enhance its adsorption power for methylene blue (MB) dye from aqueous solution. Citric acid-modified silica gel (CAMSG) was synthesized thermochemically and was characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and elemental analysis. Influences of va...

Role of a constructed wetland to humify effluent organic matter from a wastewater treatment plant
submitted by doasakm 2 hours ago - Topic: Environment
The degree of aromaticity or hydrophobicity in wastewater effluent organic matter (EfOM) increases during flow-through constructed wetlands connected directly to a wastewater treatment plant (WWTP), as identified using fractionation followed by analysis methods, with respect to major biopolymers (polysaccharides, amino sugars, protein, polyhydroxy aromatics, and lignins). In this study, WWTP ef...


Assessment of water pollution in the semi-arid region: case watershed Wadi Saida (Northwest of Algeria)
submitted by doasakm 2 hours ago - Topic: Environment
In this study, an up-to-date analysis was performed on pollution conditions in the Wadi Saïda drainage basin (North West Algeria). We focused on the water in the streams that drain the basin. The results include a number of quality parameters and give the spatio-temporal variations in surface water pollution indicators over a period of several years. The principal parameters related to the mon...

Modeling of nitritation and denitritation in a novel PITSF-SEU process using an extension of ASM2d model
submitted by doasakm 3 hours ago - Topic: Environment
In this study, an anaerobic–anoxic/oxic (A2/O) multiphased biological process called “phased isolation tank step feed technology of southeast university (PITSF-SEU)” was developed to force the oscillation of organic and nutrient concentrations in process reactors. PITSF reactor is effective for reducing energy consumption because it does not contain the internal recycle of mixed liquor an...


Effects of micro-organism growth phase on the accumulation and characteristics of soluble microbial products in MBR
submitted by doasakm 3 hours ago - Topic: Environment
Soluble microbial products (SMP) have been demonstrated as a primary obstacle for the widespread application of membrane bioreactor (MBR). This study has investigated the effects of micro-organism growth phase (MGPs) on the accumulation and characteristics of SMP in MBR. The results showed that there were three MGPs in the experiment, including exponential growth phase (EGP), deceleration growt...

Statistical modeling on COD removal from metal-working fluids through electrocoagulation process
submitted by doasakm 3 hours ago - Topic: Environment
The present investigation envisages with the percentage chemical oxygen demand (COD) removal from metal-working fluids through batch electrocoagulation reactor using mild steel anode and stainless steel cathode. Box–Behnken experimental design was used to optimize individual variables and interactions of variables on percentage COD removal. The operating variables are the current density (2.0...

An empirical evaluation of an integrated inclined solar water desalination system with spray jets variation
submitted by doasakm 3 hours ago - Topic: Environment
In this study, the productivity of an integrated inclined solar water desalination system with spray jets was empirically investigated. The effects of the feed water flow rate, solar radiation, ambient temperature, absorber plate temperature, cavity air temperature, glass cover temperature, variation in number of spray jets, and inlet and outlet temperature of the feed water on the daily produc...

Analyses of rural drinking water resources quality in the north area of Shaanxi
submitted by doasakm 3 hours ago - Topic: Environment
Improving the sanitary quality of rural drinking water resources is the important means to ensure health care for rural residents. The 10 samples of rural drinking water resources in the north area of Shaanxi province were evaluated by pH value, the content of total hardness, sulfate, chloride, chemical oxygen demand and fluoride. The test results showed that five samples are conformed to the r...