The paper presents the research results regarding metabolism of microorganisms from domestic wastewater treatment-activated sludge. approached this issue by dielectric spectroscopy measurements, chemical analyses, and specific microbiological techniques. In addition, influence extremely low-frequency (ELF) electric fields (1÷500 Hz) on microbial was studied. Four representative frequencies have been identified: 49.9, 99.9, 130.8, 150.4 Hz using applied to investigated samples. Also, loss...

In this paper an experimental study regarding the behavior of yeast subjected to electric field action at a frequency 50 Hz is presented. The aqueous suspension was prepared from distilled water - 94 ml, dry 5 g and sugar 1 g. dielectric spectroscopy method used in order characterize contributions proteins properties suspension. complex permittivity conductivity were measured room temperature. applied varies between V/cm 6 (effective value). Conductivity are found increase, resulting...

By using the dielectric spectroscopy technique in extremely low frequency (1-200Hz) range, loss tgδ was determined on both Aspergillus niger cultures different growth stages and autoclaved biomass compared to Czapex-Dox culture medium with sterile sucrose.Experimental results have shown that living matter samples characteristics.In probes, evolutionary functions of depending are continuous, specific αrelaxation governed by DC electrical conductivity.In samples, function losses tgδ,...

The results of a pilot-scale study on the influence electric field use for stimulating active sludge in biological purification tank small capacity wastewater treatment plant (up to 600 m3/day) are presented. Through specific comparative chemical tests (DO, COD, N-NH4, and Pt) it was found that, by applying sinusoidal 5 Vrms/m at 49.9 Hz suspension, overall pollutant denitrification process speed is doubled compared with reference case when no stimulation used. Also, under identical...

Through specific chemical and microbiological determinations, the interaction of extremely low-frequency (ELF) electric field (EF) 49.9 Hz 99.9 with living matter activated sludge from a wastewater treatment plant was studied. The determinations showed that EF significantly stimulates both multiplication microorganisms (more than 2x, compared to reference) rate pollutant metabolism, as opposed EF, where stimulation is insignificant (below 1.1x, reference), instead, more strongly metabolism...

HDPE composite samples with aluminum and iron nanopowders were made by extrusion injection. Samples of material obtained characterized comparative determinations dielectric spectroscopy SEM microscopy. images have indicated that the agglomerations powders used are persistent, do not decompose during injection processing. Determinations materials metal nanopowder filler higher losses than pure (reference). The highest increases in tgd up to 2.6 times, recorded for 50 nm specific high surface...

Large-scale radon monitoring is carried out due to the fact that it directly responsible for public health. European Directive 2013/59/EURATOM has been transposed into legislation of several countries and provides need long-term in homes workplaces by setting average annual reference level at 300 Bq/m3. At same time, a precursor factor, its emission being correlated with seismic volcanic activity. In this case, protection population ensured forecast similar meteorological one. The NIEP...

In this paper, a system to stimulate in extremely low frequency (ELF) electric field the microbiological activity of microbial flora active sludge wastewater treatment plant is presented. The designed and realized was tested industrial environment with without ELF stimulation. By comparing two cases for same degree pollutants elimination from wastewater, it resulted that application significantly reduces processing times biological stages (to approximately half). Thus, energy consumption...

In order to determine the durability of polymer coatings using investigation techniques based on X-rays diffraction and combined for thermal analysis (TG-DTA-DTG), were determined changes structure their thermo-oxidative characteristics (6 different paint types having characteristics) after exposure UV radiation (60W/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in range 300-400nm). The experimental results, indicate that induce...

This paper presents a comparative study with respect to the behavior of some painting materials, used mainly for decorative and protective industrial applications, exposed controlled accelerated ageing process by using thermal storage successive cycles. The evaluation structural changes, as well those concerning dielectric loss were carried out in manner, on initial samples, before any exposure stresses during ongoing treatments applied. As analysis techniques coupled impedance spectroscopy...

Polyethylene (PE) insulations have a wide applicability in the insulation of both underground pipelines and power cables. In this context, by coupled techniques thermal analysis (TG/DTG+DTA) microbiological determinations, been studied thermooxidability resistance to moulds action some polyethylene sorts. Following processing experimental data obtained it was found that during applied heat treatment (100 grd C), first approx. 380 h, there is growth LDPE (low density polyethylene)...

ATR / FTIR and DSC techniques have been used to evaluate the thermal stability of some ageing paint materials by heat treatment while immersion in natural ester-based electro-insulating oil. Experimental determinations highlighted fact that investigated (epoxy resins) a high oxygen affinity thus, closed systems (such as power transformers), they oxidize before coming into contact with transformer This behavior indicates layer (suitably chosen) applied on inside vat functions an antioxidant...

In order to identify the causes that led microbiological degradation by biofouling increases a top coat painting layer applied railway bridge was analyzed both FTIR and DSC methods; analysed material used paint in 2013.The determinations were performed comparatively on samples of similar after 10 days curing natural atmosphere at 25 � 5 �C, 60 storage under laboratory conditions (22 RH %, lighting), from certain approx. 4.5 years (exposed weathering temperate climate with Mediterranean...

Thermal TG/DTG/DTA analysis coupled with FTIR spectroscopy was applied to some sorts of mineral and vegetable oils used in electrical equipment. On heating inert atmosphere, it observed that the vaporize, while undergo hydrolysis, yielding fatty acids as main volatiles, indicated by FTIR. In synthetic air, spectra gaseous products confirm presence similar oxidation products, both for oils. The TG results vegetable-based exhibit a substantially higher thermal stability than or absence...

In built up media (complex environment), the materials are simultaneously exposed to a series of physical, chemical and microbiological stress factors that act synergistically with disturbing electromagnetic fields cause material degradation - consequences on durability safety in exploitation buildings installations. The main generative sources (stray current generators) railroads DC or AC traction various operating voltage frequency, medium high overhead power lines unbalanced currents from...

Synthetic scale corrosion inhibitors used in closed loop thermal systems, but especially open accumulate nature.Recently, a number of studies have been published concerning the possibilities using natural plant extracts for inhibition and formation.In this idea, paper presents results microbiological determinations regarding effect such product, frequently households -Calgon -and that on development some fungi, implicitly their capacity to biodegrade pollutants anthropogenic origin...

UV radiation has a long-term effect on the durability of anti-corrosive coatings applied by painting, generating conditions for accelerated localized corrosion protected metallic structure with adverse effects operational safety. This paper presents comparative study behavior some painting materials ageing exposure to relevant investigation dielectric using spectroscopy in conjunction thermal stability investigated coupled techniques analysis. From practical point view, two based epoxy...

The behaviour of some insulating fluids in contact with copper foil and / or insulation paper under thermal stress (110�30C for 1000 hours), a closed system (the access atmospheric oxygen being limited), has been studied by determining the changes viscosity concentration CO2 CO. experimental data revealed that, following applied heat treatment, change esters-based (both synthetic vegetable) is approximately 7 times lower than case investigated mineral oils. It also found ageing, gas content...

The analysis of the radon-seismicity relationship has been carried out so far in Vrancea (Ro-mania) seismic zone, with monitoring stations positioned on tectonic faults. article analyzes evolution radon under conditions existence deep and surface seismicity presence mud volcanoes along live fires caused by gases emitted from soil. area was extended to Black Sea Făgăraș Câmpulung fault, where a special detection system set up, which proposed for patenting. A case study is effect earthquakes...

The analysis of the relationship between radon and seismicity was previously carried out in seismic zone Vrancea (Romania), positioning measuring stations on tectonic faults. This article analyzed evolution under conditions deep surface presence mud volcanoes, as well fires caused by gasses emanating from ground. monitoring area extended to Black Sea Făgăraș-Câmpulung fault, where a special detection system established proposed for patenting. case study impact earthquakes Turkey (7.8 R 7.5 6...

The human activities, especially the energy production from fossil fuels and transport sector, produce huge amounts of CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> , which is a greenhouse gas [1]. In this context, developing expanding phototrophic microalgae suitable way to reduce effect by converting anthropogenic into organic mass oxygen. It should be also mentioned that mass, including algae, high added value product.