Authors:
Mihai Stefanescu, Ionut Cristea, Cristiana Cosma
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Cavitation
Drinking water
Direct sonolysis
Hybrid sonolysis
THMs

Abstract:

Trihalomethanes (THMs) are organic compounds (with toxicity potential) generated during the classical treatment flow of drinking water as a result of reaction between natural organic matter (always present in drinking waters resources) and chlorine, which is the most disinfection reagent on a broad scale, in drinking water treatment plants. Ultrasonic treatment can be feasible for THMs removal for small or medium drinking water treatment plants. This paper emphasyzes the possiblity to use sonolysis (chemical oxidation based on active radicals generated during cavitation process) as polishing step in drinking water treatment flow for trihalomethanes (THMs – trichloromethane, tribromomethane and bromodichloromethane) removal (initial concentrations over the admitted limit – 100 µg THM/l). Four sonolysis systems were tested for synthetic and real surface treated water: direct sonolysis (US), US + H2O2, US + H2O2 + Fe (Fenton sonolysis), US + H2O2 + Fe + UV (low pressure mercury lamp  = 250 – 400 nm). The variation domains of the main process parameters were as following: THMs concentrations 310 ÷ 3615 µg/L, sonolysis time 1 ÷ 60 min., ultrasonic energy 2×106 J – 8×106 J, ultrasonic amplitude 20 ÷ 80%, oxidant dose 0.6 ÷ 2.1 g H2O2/L, catalyst dose 0.25 ÷ 2 mg Fe2+/L. Experimental results showed the evolution of THMs removal depending on sonolysis system: direct sonolysis (US) 56% < sonolysis and hidrogen peroxide (US + H2O2) 59% < foto Fenton sonolysis (US + H2O2 + Fe + UV) 63% < Fenton sonolysis (US + H2O2 + Fe) 73% emphasizing that bromoform are more difficult to remove compared to other.

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Authors:
Luoana Florentina Pascu, Ladislau Andres, Smaranda Masu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
COD and TOC reduction efficiencies
Fe-Al complex coagulation agent
Wastewater of printing house

Abstract:

This study shows the wastewater efficient treatment process resulted with Fe-Al complex coagulation agent obtained from industrial waste. Coagulation agent prezented 24.5 – 28.0 g·L-1 Fe and 16.0 – 17.5 g·L-1 Al content. pH coagulation agent is in the range pH=1-2. The wastewater with high degree i.e. chemical oxygen demand (COD) = 25,000-30,000 mg O2·L-1, Total organic carbon (TOC) = 3,600 – 4,000mg C·L-1, dry matter = 9.55 – 10.45 g·L-1, etc. is resulted from printing house. Treated water samples with the optimal dose of coagulation agent based on iron-aluminium salts obtained from industrial waste prezented similar TOC and dry matter reduction efficiencies with samples treated with the optimal dose of ferric chloride. COD reduction efficiency in treated water samples with the optimal dose of coagulation agent based on iron-aluminium salts it was 10% greater vs. reduction efficiency obtained from samples water treated with classic coagulation agent, FeCl3. The advantage of the complex Fe-Al coagulation agent obtained from industrial waste was that it can be used for some wastewater of printing house in lower optimal dose, by 30%, vs. ferric chloride, coagulation agent. The complex Fe-Al coagulation agent obtained from industrial waste cost is much less than that of classical coagulation agents.

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Authors:
Mirela Alina Constantin, Lucian Alexandru Constantin, Nicolae Ionut Cristea, Ines Nitoi
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Advanced oxidation process
Cyclophosphamide
Metal and non-metal doped TiO2
Photo catalysis

Abstract:

The influence of various dopant types like S, Fe, Co, Ni (5% wt.) in the photocatalytic degradation of cyclophosphamide under UV-VIS irradiation was investigated. The working conditions were as follows: irradiation time up to 270 minutes, photo catalyst dose 100 mg/L, initial pollutant concentration 19.15 mg/L. Pollutant degradation was found to follow a pseudo first order kinetic. CP degradation rate constants decreases in the following order kFe-TiO2 > kNi-TiO2 > kCo-TiO2 > kS-TiO2 > kTiO2, which was also in accordance with chlorine mineralization rate constants.

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Authors:
Smaranda Masu, Nicolai Dragomir, Stefanita Mirel Pana, Carol Blaziu Lehr
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Fly ash
Grassland species
In-situ phytoremediation
Oil polluted soil
Sewage sludge fertilizer

Abstract:

A mixture of grassland species Lolium perenne, Festuca arundinaceea, Medicago sativa and Ttrifolium pratense were used in situ phytoremediation of oil polluted soil, with 70.45-120.52 g/kg d.m. Total Petroleum Hydrocarbons (TPH). They were studied variants of phytoremediation of oil polluted soils and fertilized with 50 t/ha stabilized sewage sludge in absence / presence of 50 t/ha fly ash, waste from coal burning power plants. Lolium sperenne herbs formed on the surfaces sown exclusive bouquets, in first weeks. After six weeks of vegetation appear and develop leguminous species Medicago sativa and Trifolium pratense. After five months, was a balanced distribution of species of legumes and grasses species on the surfaces sown. The efficiency reducing the TPH from oil polluted soil was 48.7% in variant fertilized with stabilized sewage sludge and fly ash. Efficiency was with 15.3% higher than the reduction efficiency of petroleum products in fertilized variants in fly ash absence. The process efficiency of oil polluted soil treated with stabilized sewage sludge and fly ash was similarly with phytoremediation variant with fertilizer and indigenous volcanic tuff realized.

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Authors:
Ines Nitoi, Nicolae Ionut Cristea, Mirela Alina Constantin, Lucian Alexandru Constantin
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Fe doped TiO2
Kinetic
Mechanism
Photocatalysis
2-4-6-Trinitrotoluene

Abstract:

2,4,6-Trinitrotoluene(TNT) is one of most common toxic pollutant identified in wastewater generated from ammunitions plants, due to its potential carcinogenic characteristics. Various treatment methods were investigated in order to remove such toxic pollutants and among them, photocatalysis was successfully applied. From various semiconductors, titanium was a widely studied photocatalyst, due to its chemical inertness, low cost, photo stability and nontoxic character. Since, TiO2 is only photoactive under UV irradiation, modification of semiconductor by metal doping, aimed to reduce photocatalyst band gape and increase its quantum efficiency in visible domain represents an important issue. Fe-TiO2 assisted photocatalytic degradation of TNT in aqueous media, under UV-VIS irradiation was studied. The effects of operating parameters such as catalyst loading and pollutant concentration were assessed. TNT degradation was found to follow a pseudo-first order kinetic. The main oxidative species responsible for pollutant degradation are the surface adsorbed hydroxyl radicals.

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Authors:
Maria Popa, Loredana Irena Negoita, Emilia Elena Oprescu, Sinziana Radulescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Extraction
Kinetic
Ketal
Nutrients
Soil

Abstract:

In this paper there are presented laboratory studies on the influence of additives in diesel fuels on accidental pollution of the soil. The additive used in the experiments was cyclohexanone ketal glycerol. The presence of hydroxyl groups in the structure of ketals of glycerol decreases the solubility of hydrocarbons. To solve this disadvantage and for improving other features, in order to use as additives/components for classic fuel, the hydroxyl group of glycerol ketal methyl ethyl ketone was block by transesterification with methyl esters of monocarboxylic acids. The results obtained were compared to the content of nutrients (N, P, K) in the soil polluted with diesel fuel additives and diesel oil without additives. It was performed the soils decontamination by applying the method of solvent extraction. For ecological reconstruction there were used unpolluted soil samples, samples contaminated with diesel oil with and without additives and the resulting samples after the extraction with the solvents.

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Authors:
Iryna Z. Koval
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Short-term treatment
Cavitation
Gas
Bacteria
Cyanobacteria
Disaggregation

Abstract:

Short-term cavitational treatment (22 kHz, 1.65 W/cm3, 35 W) of the water showed an increase in the amounts of the cells of Bacillus cereus bacteria type that was explained by the process of cell disaggregation usage microscopical investigations. The duration of disaggregation process was 3-5 minutes with gas bubbling during sonication but 30 minutes without gas bubbling during sonication. It was shown an acceleration of disaggregation process under simultaneous action of gas and cavitation by 10 times (synergistic effect).

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Authors:
Laurentiu Razvan Dinu, Valeriu Badescu, Violeta Dediu, Ionut Cristea, Viorel Patroescu, Voicu Oncu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
CSTR
Ettringite
Gas
Mine water
Cyanobacteria
Sulphate

Abstract:

An experimental study has been carried out to assess sulphate precipitation via ettringite process from acid mine water (AMD) originating from closed non-ferrous Romanian mining areas. Such a treatment is required, because by conventional treatment of the AMD with calcium hydroxide, the conformity for sulphate will not be achieved, because the concentration correlated to gypsum solubility exceeds the limit value by roughly three times. Although sulphate is considered benign or with low toxicity, some countries have set limits for the wastewater discharged to natural receivers, from 500 to 1000 mg/L or 600 mg/L in Romania. The process of sulphate precipitation as ettringite using solid aluminium sources is known to be slow. Tests for sulphate precipitation, using monocalcium aluminate cement as source of reactive aluminium for the ettringite formation were done using continuous flow mixed flow reactors in series (or continuous stirred reactors, CSTR). This reaction system allows the direct determination of the apparent reaction rate versus sulphate concentration which can be used further for various design tasks. The reaction rate for sulphate concentration below 600 mg/L may be less than 5 mg/L/min, depending on working conditions. The mixed flow reactors series has a net advantage over single CSTR, the best choice for a full scale treatment plant is a mixed flow reactors series also, as the results indicate that a system with a single mixed flow reactor is to be much larger.

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Authors:
Maria Harja, Olga Kotova, Gabriela Ciobanu, Loredana Litu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Adsorbent
Ash
Lead
Lime
Cyanobacteria
Synthesis

Abstract:

The development of new materials, with imposing properties – for environmental protection, represents a challenge for contemporary society. In this paper, we propose obtaining of new adsorbent materials from thermo plant ash and lime. The use of ash presents the advantage, because this waste is in great quantities, and it is a way for its capitalization. The new materials offer new scientific and technological perspectives due to the specific interesting physical properties of these materials. The utilization of adsorbents based on ash/lime, for waste water depletion, represents an alternative with ecological and economic implications. The authors present in this study the results of experimental researches on the adsorbents prepared in the laboratory using fly ash produced at CET Holboca Iasi and lime from Bicaz. The experimental conditions of obtaining new adsorbents were established and the characterization of synthesized materials was realized. Raw and synthesized materials were characterized by: SEM/EDAX (Quanta 3D – AL99/D8229), XRD (X’Pert PRO MRD X-ray diffractometer), BET (Quanta-chrome Instruments) and FT-IR analysis (DIGILAB FTS 2000). Experimental results demonstrated that the new materials can be successfully used for removal of lead from waste water. The removal rate was over 97%, after 60 minutes, and adsorption capacities were obtained of 21.25 mg/g. The resulted product is easy to separate and can be used as building material. On the other hand, the product is not polluted for the environment.

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Authors:
Victorita Radulescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Energy efficiency
Environmental engineering
Hydroelectric power generation
Mathematical model
Numerical simulation

Abstract:

In Romania, there are more than 200 dams realized during 1975-1990 from local materials, without any ulterior remediation or rehabilitations. Nowadays, many hydropower systems confront with infiltration through dams or lateral dikes, followed by unexpected erosions. In order to maintain the hydropower system active, the water level is drastically reduced, sometimes even with 10 m. Consequently, it means less water for the human necessities (water supply, irrigation), but mainly few resources to produce electric energy. The research paper starts by presenting the actual dams situation, structured on hydrographic basins. For the case study two hydropower lakes from Arges-Vedea hydrographic area that confront seepage through embankments were selected. In that area there are more than 100 lakes which confront with different functioning problems. The local geomorphologic structure and the water quality create an image of local functioning conditions. Further, there are briefly presented the mathematical and numerical models, elaborated as to establish the infiltration risk zones. The numerical model is tested and calibrated based on local conditions, showing the zone with erosion and infiltration risks. Finally, some conclusions, possibilities to extend the numerical model, the acknowledgements, and references are presented.

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Authors:
Belal EL Boutaybi, Violeta Dediu, Cristiana Cosma
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Adsorption
Heavy metals
Volcanic tuff
Walnut shells

Abstract:

Some natural adsorbents were evaluated for the advanced removal of pollutants from aqueous systems. The sorption capacity of walnut shells and volcanic zeolite tuff (from Mirsid-Cluj Romania) to remove the chrome and cadmium at different experimental conditions was studied. The concentration of metal ions in aqueous systems was evaluated with an inductively coupled plasma mass spectrometer (ICPMS) and an atomic absorption spectrometer. The effect of time, initial concentration of the metals and solution pH on the adsorption at room temperature was studied. pH of the solutions was found to influence the adsorption. Higher Cr(VI) adsorption was observed at lower pH and at low concentration of metal ions. The maximum efficiency of volcanic tuff in acidic media was 97.12% for chrome and 57.04% for cadmium, respectively, for 0.1 mg/L initial concentration. Moreover, in the same experimental conditions, the maximum efficiency of walnut shells was 61.24% and 44.51% for chrome and cadmium. The two low-cost natural sorbents were efficient for the remove of pollutants from aqueous systems.

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Authors:
Nicolae Strambeanu, Doru Paunescu, Daniel Arghiriade, Laurenţiu Demetrovici
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Combustion
Equations
Nanoparticles
Reactions
VOC

Abstract:

The kinetics of the oxidation process of the organic substances known as fuel gas (the alkanes class in general) deals with reactions whose mechanisms are analyzed in many theories and models. Irrespective of the nature and excess of the carburant, all partial combustion intermediates are revealed: alcohols, aldehydes, organic acids (that together with other derivatives from catalytic reforming reactions are characterized by the global parameter VOCs), carbon monoxide and carbon dioxide and finely divided carbon under the form of soot. The volume of oxidation intermediates increases when the carburant excess decreases monotonously to values below the stoichiometric ratio, so that when the limit is reached the carbon dioxide and water vapor volumes can be minimal. This paper puts forward a kinetic combustion model based on the parallel and consecutive reactions producing part of the chemical compounds that form the concentration of VOC, carbon monoxide and finely divided particles of the gas produced by fuel gas combustion.

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Authors:
Mihai Lungu, Adrian Neculae, Antoanetta Lungu, Nicolae Strambeanu, Daniel Arghiriade, Laurentiu Demetrovici
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Air pollution
Dielectrophoresis
Flue gas filtration
Hazardous waste
Incineration
Microfluidic device
Nanoparticle separation
PM2.5
PM1

Abstract:

This study deals with the experimental evaluation of some relevant ash samples collected from the flue gas filters of a hazardous waste incinerator plant. The experimental analysis focuses on size, distribution and dielectric properties of the samples. The reported results reveal the presence of nanoparticles in the samples and the possibility to use dielectrophoresis for their handling. The study exploits also numerical simulations in order to investigate the behavior of nanoparticles with size range from 50 to 150 nm, which is fructified as a micro channel – working unit used as a particulate trap. Based on the experimental data and a proposed mathematical model, the concentration profile of nanoparticles suspension inside a micro fluidic separation device is calculated and the performance of the device is analyzed in terms of three new specific quantities of separation process, called Recovery, Purity and Separation Efficiency.

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Authors:
Victorita Radulescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Environmental engineering
Environmental monitoring
Prototype
Renewable energy sources
Water conservation

Abstract:

In Natural Reservation is very important to maintain the environmental, the equilibrium for the protected species, flora, and fauna. The paper presents a technological model perfect adapted to these conditions as not disturb the local equilibrium. In the first part are mentioned the topic importance and the new problems appeared into last decades, related to the environmental problems in Natural Reservation Lake Techirghiol. This new solution placed on a mobile pontoon uses renewable resources as to collect and partially dry the collected sludge from the lake. Some experimental measurements were done in 2015, as to determine the quality of water, the main parameters, and the conditions responsible for disturbing the ecosystem. The technological model intends to solve the local problem, to collect, compact and partially dry the active sludge. The extracted sludge can be in short time integrally consumed for agricultural purpose, as ecologic and nutritive fertilizer for the adjacent area, known as the Plover, with low potential for agriculture. The sludge, well known in the past for its human therapeutic utilization, more, then one hundred ago, nowadays-due ecological and biological changes lost his efficiency. The reconstruction of the local ecologic balance and for the sludge to recover its therapeutic properties, using renewable resources, without disturbing the environment are the main objectives of this research. Some conclusions, the acknowledgements, and references are also presented.

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Authors:
Mihaela Iordache, Luisa Roxana Popescu, Ioan Iordache
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Organochlorine compounds
Ultrasonic irradiation
Sonochemical processes
Wastewater

Abstract:

Removal of the organochlorine compounds from industrial wastewater by sonochemical processes was performed in order to evaluate process’ efficiency. Sonochemical degradation of the following organochlorine compounds: 1,2dichloropropane, 1,1,2-trichloroethane, 2 ethylhexanol and , ’—dichlorodiisopropylether was carried out. The experiments was realized with two types of equipment: ultrasound bath UCD-150 and sonotrode UP 200 Ht. Experimental results showed high efficient removal for all compounds: 1,1,2- trichloroethane and ’ dichlorodiisopropyl ether 78.0%, 1,2 Dichloropropane 66.0%, 2 ethylhexanol 35.0 % in bath ultrasound treatment after 60 minutes. Degradation of ’-dichlorodiisopropyl ether, 1,1,2-trichloroethane, 1,2 dichloropropane and 2 ethylhexanol performed much better for sonotrode with 14 mm diameter (89.0%, 77.5%, 73.0%, respectively 73.0%) than for sonotrode with 40 mm diameter (64.0%, 64.0%, 53.0% and 48.0%). This difference between the two probes regarding removal efficiency can be explained by different amplitudes of equipment.

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Authors:
Bogdan Stanescu, Lidia Kim, Carol Lehr, Elena Stanescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Assessment
Environment quality
Heavy metals
Pollution

Abstract:

The paper presents the results obtained by performing specific activities aimed to assess the quality of the soil and water components (surface and groundwater) in Copsa Mica, a small town from Romania, well known for the historical pollution recorded over several decades. It is known that the contamination was induced by the industrial activities carried out in the area, which is caused by sulfur dioxide air emissions and atmospheric particulate matters containing heavy metals, mainly cadmium, lead and zinc. The pollution of the city and the neighboring areas was mainly due to activities of two companies: SC Sometra SA (with a non-ferrous metallurgy profile, which before 1990 was considered the largest unit in the country) and SC Carbosin SA (with a chemical profile until its closing, in 1993). The assessment of the quality level of the environmental factors was carried out in 2016 through specific activities for soil and water quality investigation – sampling and physico-chemical analysis in R&D Institute for Industrial Ecology ECOIND laboratories, in order to highlight relevant elements of environmental quality of the above mentioned year, within a pre-established experimental field and targeting the limited area of the Copsa Mica city. As an important aspect, it is worth mentioning that the footprint of the pollution sources is still present in the area, even long after their activity has ceased. It is estimated that a soil and water monitoring could establish a dynamics of the quality parameters in the Copsa Mica area during the subsequent periods.

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Authors:
Irina Catianis, Dan Secrieru, Albert Scrieciu, Dumitru Grosu, Iulian Pojar, Ana Bianca Pavel
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Assessment
Bed-sediments
Environment
Physical-chemical
Surface water

Abstract:

At the end of its course of 2857 km running to the Black Sea, the Danube River – the longest river in the European Union shapes a river delta, an exclusive area consisting of a complexity of water and land, numerous lakes, ponds, marshes and unique waterways. The Danube Delta, considered the Europe’s largest wetlands, is included in Unesco’s World Heritage list, due to its outstanding importance conferred by the many natural habitats with their specific characteristics and bio diversities, preserved in a near pristine state. Even though considerable conservation efforts have been made
lately, the Danube Delta is still subject to threats due to both natural and anthropogenic stressors that may alter its ecosystems. This study aims to investigate the water and bed-sediment general characteristics of some lakes from the Matița – Merhei Depression located in the fluvial delta plain, to assess the current quality status of water and sediments. A significant number of water and sediment samples were collected from each lake in October 2016, for determination of water physicalchemical parameters, lithological components and some heavy metals – analysed in random bed-sediment samples. The investigation results show that the water environment-related indicators fluctuated in terms of sampling sites and generally agreed with the Romanian environmental quality criteria. Average lithological composition of the bed-sediments indicates an autochthonous source for the recent accumulation of sediments. Overall, the technophyllic heavy metal concentrations of the bed-sediments were below the limits of the quality criteria. The exceptions were
represented by local values, incidentally exceeding the recommended limit.

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Authors:
Lidia Kim, Alina-Maria Muresan, Adriana Cuciureanu, Doina Guta, Madalina Arama,
Nicolae Ionut Cristea, Violeta Dediu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Experimental models
Heavy metals
Industrial waste
Microwave digestion

Abstract:

In the present paper we report, a series of experimental characterization and analysis models that can be applied to industrial waste samples in order to determine the heavy metals within them. During our studies we determined that both preparation and pretreatment of the waste sample are the two most important steps in the analysis process. Therefore, an increased attention was given in using appropriate procedures and methods for preparation and pretreatment. In order to ensure a correct and secure analysis were developed experimental models based on preparation and pretreatment
stages and also on organic matrix decomposition method (digestion process with acid mixture under microwave). These experimental models were tested on a series of wastes coming from processing and finishing activities of metal surfaces and other
materials. Metal concentration was analyzed by AAS (atomic absorption spectrometry) and XRF (X-ray fluorescence spectrometry). The obtained results
proved that the proposed experimental models are suitable for analysis of different types of industrial wastes samples.

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Authors:
Georgeta Madalina Arama, Lidia Kim, Doina Guta
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Dangerousness
Disposal
Elimination
Recovery
Wastes

Abstract:

A general scheme for the assessment of dangerousness of waste is presented taking into consideration the new European and Romanian applicable laws in order to adequately manage them (storage, elimination with specialized firms – preparation for disposal/recovery, recovery, and final disposal). Some relevant examples from current practice will be reviewed emphasizing the interest aspects in applying the current legal provisions in order to adequately manage the waste in Romania in the spirit of sustainable development and protection of environment and human health on short, medium and long term.

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Authors:
Victor Vladimirov, Ioan Bica
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
GRP
LCA
Mechanical recycling

Abstract:

When it comes to reutilization of glass reinforced plastic composites (GRP), mechanical recycling is one of the most widely used methods. This research brings further insight to environmental assessment of mechanical recycling by comparatively analyzing three types of products (concrete block, plastic foil and ceramic sink) from an LCA perspective. Thus, a deeper relationship between theoretical LCA modelling, factual production and market potential can be established. Results show that reutilizing GRP recyclate as replacement for petroleum-based products delivers most environmental benefits.

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Authors:
Victorita Radulescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Biodegradation
Environmental engineering
Environmental monitoring
Maintenance management
Water conservation

Abstract:

The paper presents a solution designed and tested hydroelectric lakes, which have the useful volume reduced by 80% since the commissioning. The experimental prototype perfectly ecologic may be applied into hydropower lakes with complex utilization, including water supply for human necessities and cities. At the beginning are mentioned some responsible factors as the climate, hydrological, physical, and chemical for the lake’s eutrophication. The vegetation developed so rapidly, diminishes quickly the water volume of the hydropower lakes, meaning less produced electric energy. Further, are presented the previous solutions tested, without any effect. This new solution, proposed as patent, is realized and tested in the Lake Pangarati. The main steps, challenges, and main solutions, during the utilization, are mentioned. Finally, in images are presented the obtained results, the real differences
between shores with and without the barrier utilization. This new ecologically and friendly environment solution, to combat the excessive vegetation has a considerable efficiency and low costs. The main purpose is to rehabilitate the area and to reestablish the previous environmental conditions, taking into account that these two lakes Pangarati and Vaduri are RAMSAR sites since 2006. Finally, are mentioned some
conclusions, acknowledgments, and references.

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Authors:
Victorita Radulescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Environmental protection
Measurements
Numerical modeling
Repeated floods
Sediments transport

Abstract:

Due to irrational exploitation of water reserves from some hydropower systems and due to improper maintenance of the natural river beds, in present days, in conditions of abundant rainfall, the whole area into river vicinity are in a real danger. The present paper is dedicated to estimate the real capacity of transport of natural riverbeds in permanent correspondence with the zone reality during and after repeated floods. A numerical model based on experimental measured local data is elaborated. In these conditions in 2005, 2010 and 2012 in the Siret basin, on Bistrita and Cracau rivers area, nine floods considered major were mentioned, followed by human victims, lost animals, and huge terrains under water for more than five weeks. First is presented an actual documentation concerning the situation of functioning, producing, transport and exploitation of hydro systems from the affected areas, based on local experimental measurements. A new numerical modeling of the free surface water flows is realized, taking into account the possibility of permanent changing of lateral surfaces (river beds) during floods, due erosion and sediment transport. It must be considered that during the floods may appear also zones with uncontrolled deposition of the moved and transported sediments. Finally, an optimum management of the flow rate on short and medium term, to assure the environmental protection of the affected areas and some conclusions are mentioned.

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Authors:
Mihai Bratu, Tanase Gheorghita, Danciulescu Valeriu, Ileana Nicolescu, Mihaela Petrescu
Conference: International Symposium “The Environment and the Industry”
Date: September 28-29, 2017
Location: Bucharest, Romania
Published: 2017
Keywords:
Electromagnetic field
Electromagnetic waves
Frequency
Source

Abstract:

Electromagnetic fields (EMF) are a combination of invisible electrical and magnetic fields of force. EMF is present in all places where electricity is used and surrounds every charged electric object. The impact of the electromagnetic field on the environment and people’s health has begun to awaken more and more the interest of research in this field. This is due to the widespread development of various devices that emit electromagnetic waves on different frequencies. This paper presents comparative studies on the level of electromagnetic waves. Determinations have been made both at source so as to highlight the dispersion of electromagnetic waves and their effect on the population in the studied area.

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