Volume 7, No. 2 (2006)
Articles
THE THERMODYNAMIC PROPERTIES OF SUPERCRITICAL FLUIDS: CASE OF CARBON DIOXIDE
ABBACI A.*, ACIDI A.
A new fundamental equation of state that describes the behavior of the thermodynamic properties of carbon dioxide in the vicinity of the critical point is formulated. In this work, we present an equation of state based on the crossover model that takes into account not only the scaling laws at the critical point but also the classical behavior far away from the critical point. The equation of state is constructed based on the new pressure data measured by Duschek and co-workers. We give the comparison with different set of thermodynamic-property data available, such as the pressure data, the specific heat data.
BIODEGRADATION DES HYDROCARBURES EN EAU DE MER: CAS DE LA NAPHTA B
BOUTEFNOUCHET NAFISSA*, BOUZERNA NOUREDDINE, HOURIA CHETTIBI
Pollution of Mediterranean Sea with oil derived hydrocarbons is a public health problem. Among the numerous oil refineries located at the seacoast, the oil refinery of Skikda, in the north-eastern Algeria, no. 3 in the world as magnitude, is the object of the present study. The aim of the work is pollution prevention by biological means, mainly by biodegradation using selected microorganisms with high efficiency in the effluents treatment and accidental oil spills in marine waters.
CONVERSION OF NITROGEN OXIDES AND AROMATIC VOLATILE ORGANIC COMPOUNDS ON SCR-DeNOx COMMERCIAL CATALYST
LAZĂR LILIANA(1), STOLLE RAIK(2), KÖSER HEINZ(2), BANDRABUR FLORIN(1)
The results of laboratory research work concerning the mbenzene and nitrogen oxides conversion on commercial catalyst SCRDeNOx n(V2O5-WO3/TiO2, with 0.53 %wt. V2O5), which is specific to the process of selective catalytic reduction in high-dust system. Experiment was carried-out at temperatures of 573 – 623 K, for low concentration of benzene (50 – 100 ppm C6H6) in gas flux at a spatial velocity equal to 6400 h-1. The influence of water vapours (5 % vol. H2O) and of specific reactants for the SCR-DeNOx (NOx, NH3) process upon benzene conversion in air stream, as well as the influence of benzene on nitrogen oxides conversion were studied. The catalytic oxidation of benzene is partial and occurs with conversion higher than 70 % at temperature of 623 K in the presence of water vapours, catalyst selectivity toward CO2 formation being equal to 60%. Presence of benzene had no significantly influence on conversion of nitrogen oxides in selective catalytic reduction reaction.
INFLUENCE OF SULPHUR DIOXIDE AND HALOGENATED ACIDS UPON BENZENE CONVERSION ON SCR-DeNOx COMMERCIAL CATALYST
LAZĂR LILIANA(1), STRAUBE SANDRA(2), KÖSER HEINZ(2), BALASANIAN ION(1)
In the presence of SCR-DeNOx commercial catalyst with low content in active component (0.53 % wt. V2O5), specific to treatment of gas emissions containing nitrogen oxides, benzene oxidation is possible. Benzene catalytic conversion can be influenced by the presence of the other components of the gas emission. In this paper, the experimental results concerning the influence of halogenated acids (HCl, HBr) and sulphur dioxide on benzene behaviour during oxidation in humid air stream (5 % vol. H2O) and defining of the reaction products are presented. Experimental study was conducted on a laboratory set-up operated in continuous regime, at temperatures of 573 – 623 K and for a gas spatial velocity equal to 6400 h-1. Oxidation of benzene, present in low concentration in the gas (80 – 100 ppm C6H6) is partial, the catalytic selectivity towards carbon dioxide forming being approximately 60 %. The presence of halogenated acids and sulphur dioxide determines a supplementary consumption of benzene, as a result of substitution reaction with participation of benzene ring that leads to formation of some aromatic derivatives.
CAPTURE DE CO2 EN CENTRALES AU CHARBON PULVERISE (CP): ETUDE DU PROCEDE A BASE DE CARBONATE DE POTASSIUM
AMANN J.M.(1), BOUALLOU CHAKIB(1)*, DESCAMPS C.(1), KANNICHE M.(2)
The capture of CO2 in the power production systems is due to the desire of reduction of greenhouse producing gases. The present study deals with the separation of CO2 from flue gases of power plants through chemical absorption in potassium carbonate solutions. The flue gas composition (11.71 % moles CO2) corresponds to a 600 MWe power plant using pulverized coal as fuel and desulphurization. The CO2 absorption was simulated using Aspen Plus™ software. For estimating the physical properties of substances and mixtures, the thermodynamic model NRTL has been chosen. A parametric study revealed the influence of the solvent flow upon CO2 separation degree and reboiling heat demand, at different loading degrees. The study shows that reboiling heat demand is very high at separation degrees higher than 50%.
VALORISATION DES AMAS DE SERPENTINITE PAR NANOTECHNOLOGIE. PARTIE I - OBTENTION DE LA SILICE POREUSE
SÂRBU ANDREI(1)*, MARA LUMINIŢA(2), STOICIU FLORENTIN(2), BADILITA VIOREL(2), FRUTH VICTOR(3), IOVU HORIA(4), GAREA SORINA(4), MOTOC ŞTEFANIA(5), SÂRBU LILIANA(1), BEDA MARIANA(1)
After the old mining of asbestos, in the “Portile de Fier” Romanian natural reservation, by the Danube, at the Dubova mine, several dumps remained, containing mostly serpentinite (magnesium silicate). The dump serpentinite is a green-yellow soft rock, having Mohr hardness about 3, which has few utilisations. The tentative for solving the ecological aspects in the natural reservation impose imperiously the extinguishment of these dumps. It is why it is urgent to find new utilisation to this mineral. The work presents, firstly, a mineralogical analyse of the Dubova dumps. The mineralogical analyse proved that, in the samples taken from the dumps, all important members of the serpentine group are presents: antigorite and lizardite (lamellar forms), chrysotile (fibrous form) and olivine, which is the origin rock of the serpentine. The thermal diagrams of the serpenitinite revealed two strong endothermal effects in the 400 - 700 oC range, which are though to prove the two steps antigorite dehydration. The mineralogical analyse attested the possibility of utilisation of the serpentinite for the inorganic porous structures generation, because it has a homogenous composition referring to the major mineral phases (over 75%). These major phases are lamellar forms of antigorite and lizardite. Later, the work presents the studies for the porous silica preparation, performed by the attack with inorganic acids, namely: sulphuric, chlorhydric and nitric acids. A stoichiometric ratio between reactants was used. The reaction temperature was maintained at 96 oC and the reaction medium was stirred during the reaction time, at a constant stirring speed (500 rot/min). The reaction time for all reactions was the same: 2 hours. It is also discussed the influence of the kind of acid on the chemical composition of the two obtained phases: liquid phase and gel phase. The preliminary tests concerning the generation of the silica inorganic porous structures showed that the silica obtained by the acid attack, is contaminated with iron, aluminium, chrome and nickel, which are outgoing from the initial serpentine. After the two steps washing in boiling water and the drying 3 hours at 60 - 80 oC, the silica contains a lot of free water (which is probably retained in the pores), which was assessed by the losses at calcination (900 oC). Drying the gel, a porous silica was obtained, having a specific surface (assessed by BET) of 200-270 m2/g.
VALORISATION DES AMAS DE SERPENTINITE PAR NANOTECHNOLOGIE. PARTIE II - OBTENTION DE COMPOSITES POLYMERIQUES HYBRIDES
SÂRBU ANDREI(1)*, FRUTH VICTOR(2), IOVU HORIA(3), GAREA SORINA(3), VLADUTIU LIANA(4), BRÂNZEI MIHAI(4), MOTOC ŞTEFANIA(5), MARA LUMINIŢA(6), SÂRBU LILIANA(1), BEDA MARIANA(1)
In the Romanian natural reservation “Portile de Fier”, by the Danube, there are various dumps, which contain mostly serpentinite (magnesium silicate). The dump serpentinite has few utilisations. A solution for the valorisation of this ore could be the transformation in porous silica, which can serve as raw material for the production of hybrid polymeric inorganic-organic composites. The work presents, first, an advanced structural analyse of the silica, obtained by the attack of the serpenitinite with inorganic acids. At the beginning of the study, differential thermal analyse (DTA) and combined thermogravimetry (TG/DTG) of the silica in the range 20-1000 oC was performed. The first method showed an endothermic effect at about 58 oC, which was confirmed also by the second method, which revealed a weight loss at the same temperature (58 oC). This asserts the elimination at this temperature of volatile substances, especially water. The abatement of the water boiling temperature is a first evidence for the existence of pores in silica. The BET method assessed a considerable specific surface, ranging between 200-270 m2/g. The silica structure was additionally examined by X rays diffraction (XRD), finding its preponderantly amorphous character. The porous silica was used as matrix for the radical polymerisation of acrylonitrile, initiated with azoisobutirodinitrile (AIBN). A study, concerning the influence of the kind of inorganic acid used in the attack of the serpentinite on the polymer hybrid inorganic-organic nano composite characteristics, was achieved. FTIR and DSC evidenced the formation of hybrid composites. The optic microscopy attested finally the pores extinguishment by filling with polyacrylonitrile. Also a study concerning the influence of the reaction time on the proprieties of the polyacrylonitrile was performed. The polymer composites went trough a cyclisation process, heating at 250-300 oC, and then went trough a graphitisation process at temperature about 500 oC. Hereby, an intimate mixture between the silica and carbon was obtained, which was used for the silicon nitride generation. For that, the graphitized composite was heated in nitrogen atmosphere to temperatures between 1400 and 1500 oC. The silicon nitride is a ceramic material well known for its very high physico- mechanical, electrical and thermal characteristics that render it useful in different applications.
SORPTION KINETICS OF ZINC AND NICKEL IONS ON MAIZE COB
BANU IULIANA
The removal of zinc and nickel ions from aqueous solutions by adsorption on maize cobs was investigated. The amount of the metal ions increased with time. The highest sorption rates of the metal ions were obtained in the first ten minutes, in the next fifty minutes the uptake rate gradually decreases progressive and practically is zero after sixty minutes. The sorption rates were 72% for Zn2+, and 82% for Ni2+. This study showed that the sorption of zinc and nickel ions on maize cobs is particle diffusion controlled. The rate coefficients for particle diffusion were 0.053 min-1 for Zn2+ and 0.076min-1 for Ni2+.
EPURATION AVANCEE DES EAUX RESIDUELLES DE L’INDUSTRIE DE CELLULOSE ET DU PAPIER PAR DES PROCESSUS D’OXYDATION DE TYPE FENTON
TUDORACHE ELENA, UNTEA ION, ORBECI CRISTINA
A comparative experimental study on methanol, formaldehyde and p-chlorophenol degradation with hydrogen peroxide by advanced oxidation process Photo-Fenton type is presented. The degradation process is determined by the very high oxidative potential (2.8V) of the OH. radicals generated inside the reaction medium by Fe2+/3+ catalyst coupled with UV radiations. The influence of the hydrogen peroxide excess, initial solution's pH, Fe2+/3+ catalyst concentration, nature and initial concentration of organic compounds and reaction time on the oxidation process are presented.
PROCEDES DE DEPOLLUTION PAR EXTRACTIONS SUR MEMBRANES LIQUIDES SUPPORTEES ET LIQUIDE-LIQUIDE DU CHROME(III) EN MILIEU CHLORURE AVEC L’ACIDE DI-2- ETHYLHEXYLPHOSPHORIQUE ET L’OXYDE DE TRIOCTYLPHOSPHINE – BASE SUR LEUR MELANGE SYNERGIQUE
DIDI MOHAMED-AMINE(1)*, SEKKAL A. R.(1), VILLEMIN DIDIER(2)
The objective of the study is the extraction of chromium (III) using the liquid-liquid extraction (LLE) technique and the supported liquid membrane (SLM) technique using di(2-ethylhexyl)phosphoric acid (D2EHPA), trioctylphosphine oxide (TOPO) and their mixtures, D2EHPA/TOPO, in the absence respectively presence of KCl, in order to compare and optimize these techniques. Prior, a comparative study for chromium (III) extraction using batch/continuous SLM has been conducted. The extraction of chromium (III) in acidic environment (HCl 2M) with D2EHPA (0.17 M), TOPO (0.11 M) and their mixture D2EHPA/TOPO (15%: 10%) dissolved in dichloromethane is explain by the formation of various complexes. The kinetic studies showed that the time to reach equilibrium varies from system to system. The time corresponding to maximum permeability is different from the time corresponding to equilibrium achievement, whatever the system is. In the absence of salts, the batch system gives a better yield than the continuous one, and the yield depends on the used extracting agent. Starting from a 10.24 g/L Cr(III) at pH = 5, a 100% extraction yield has been obtained by SLM extraction in presence of KCl. The combination of D2EHPA with TOPO produced a synergetic effect, both in LLE and SLM techniques and both in presence or absence of KCl. Always the equilibrium is reached in a longer time than using only D2EHPA alone as extracting agent. The number of cycles necessary for total purification of an aqueous solution contaminated with 10.24 g/L Cr (III) is four. The life span of the SLM impregnated with extracting agent is 108 hours. The good stability of the membrane recommends it in industrial applications for chromium (III) removal.
ADDITIF ANTIDETONANT A BASE DE FER POUR L’ESSENCE AUTO
BĂDULESCU ROXANA*, BOMBOS DORIN, CRISTEA STELIANA, BOLOCAN ION
In this work iron compounds are tested as new antiknock agents for gasoline. The synthesis and characterization of iron compounds are described. The acetylferrocene was obtained by Friedel-Crafts acylation of ferrocene. Infrared and ultraviolet spectroscopy were used to characterize the acylation products. The ferrocene derivative added to unleaded gasoline raises the research octane number with two units.
ABSORPTION OF SULFUR DIOXIDE IN WASTE CALCIUM CARBONATE SLURRY I. PREPARATION AND CHARACTERIZATION OF SLURRY
SZÉP ALEXANDRU*, HARJA MARIA
Preparation of relative stable slurries from waste calcium carbonate, resulted from the NPK fertilizers industry, and their testing as buffering agent, are reported. Characterization of the waste calcium carbonate was carried out by IR spectra, chemical analysis and thermal behavior, in comparison with two natural limestones, taken out from two Romanian deposits, i.e. Sandulesti and Vata de Jos. In order to establish the main physical properties of the slurries prepared by dry and wet milling, measurements of their particle size composition, settling number and rheology were performed. The buffering capacity against some acid solutions, determined in a batch reactor with stirring and provided with conductometrical sensitive elements was utilized as a measure of their reactivity.
ABSORPTION OF SULFUR DIOXIDE IN WASTE CALCIUM CARBONATE SLURRY II. THE INFLUENCE OF THE PARAMETERS ON THE ABSORPTION RATE
SZÉP ALEXANDRU*, HARJA MARIA
Using Lewis’s reactor technique we have studied the influence of the calcium carbonate’s nature and its milling degree on the saturation rate of the slurry with different rations between the solid and the liquid. The evolution of this process has been expressed by variation of the content of sulfur dioxide absorbed, reported to the reaction mass. The result shows the importance of the source of calcium carbonate’s nature and milling degree on the absorption rate. Regardless of the carbonate’s type – natural or waste product – and the s/l ration in the suspension, the sulfur dioxide concentration in the reaction mass is over the value obtained for water. If the dry milling in balls or impact-mills changes in a reduced measure the dissolution rate, the wet milling guarantees an advanced reactivity.
RECHERCHES SUR LA DETERMINATION ET LA REDUCTION DE LA TENEUR EN SUBSTANCESn EXTRACTIBLES DANS LES EFLUENTS DE LA FABRICATION DE LA PÂTE ET DU PAPIER
STANCIU CONSTANTIN
The paper presents the results of the analysis of the effluents of a pulp mill that uses as raw material hardwood (mainly beech and poplar) in terms of extractibles in oil ether, correlated with other quality indicators: pH, suspended solids, fix residue, COD(Mn), COD(Cr), BOD. The total charge of the effluent is driven by the charge of wastewater from pulping and washing stages: 105.85 mg/L in pulping effluent and 86.16 mg/L in washing effluent. It has been observed a proportionality between the extractibles content and the values of COD(Cr) and filterable dry residue. The reduction of extractibles may be achieved with a supplemental effluent treatment with aluminum sulfate in the presence of polyacrylamide (PAA) as flocculent. For an effluent with 118 mg/L extractibles in oil ether, a treatment with 400 mg/L aluminum sulfate and 5 mg/L PAA, a 47% reduction of extractibles has been reached, simultaneously with important reductions of COD(Mn), COD(Cr) and fix residue.
LES BIOTECHNOLOGIES DANS LA PROTECTION DE L’ENVIRONNEMENT. APPLICATIONS DANS LE DOMAINE TEXTILE
STANESCU DINA MICHAELA
The applications of enzymes in textile industry are presented. The enzymes suitable for textile processes (oxydo-reductases and hydrolyses) as well as the type of enzymatic treatments applied on textile materials have been described. Some results obtained by using biotechnology in the textile field are presented. The development of textile biotechnology in the last decades due to development of knowledge in the field is pointed out. The advantages and disadvantages of using enzymes in different steps of textile materials processing are discussed. The effects of the textile biotechnology on the environment are underlined. As a generalconclusion, the biotechnology may assure new ecological procedures in the textile materials processing.
ETUDE DU COLMATAGE DES MEMBRANES
CIOBANU GABRIELA(1)*, CARJA GABRIELA(1), ISTRATI LĂCRĂMIOARA(2), HARJA MARIA (1)
Fouling is the main problem in most applications of membrane technologies for water and wastewater treatment. Fouling can be defined as a decline in flux with time of operation. The flux decline related to fouling is best observed when all other parameters are set to constant values. When the system is operated under constant pressure mode, fouling is indicated by flux decline. On the other hand, transmembrane pressure increase will represent the degree of fouling when the system is operated in a constant flux mode. Resistance and fouling are closely related and the factors affecting resistance also play an important role in membrane fouling. According to most definitions, however, membrane fouling is different from concentration polarization effects and means a decline in flux or an increase in transmembrane pressure that is irreversible unless the membrane is cleaned. This research was to study the treatment of surface water (Bahlui river, Iasi, Romania) using membranes, and fouling process. Two selected membrane types, cellulose acetate membrane with pore size 0.2 µm and polyurethane membrane with pore size 1 µm were used in this study.
TREATMENT OF SOME PERSISTENT ORGANIC POLLUTANTS WITH CHEMICALLY MODIFIED SMECTITES
BUCISCANU INGRID(1)*, MAIER STELIAN-SERGIU(1), DESELNICU VIORICA(2)
Some nanoparticulated sorbents, known in the specialty literature and practical use as organoclays were prepared, based on native sodium smectite modified with some quaternary ammonium cations – hexadecyltrimethylammonium (HDTMA), N-cetylpyridinium (NCPy), dimethyldioctadecylammonium (DDA) and alkylbenzyldimethylammonium (ABDMA) – through a ion exchange reaction. The products were characterized by means of sorption isotherms over a range of 0 ÷ 250% satisfaction degree of the cation exchange capacity (CEC), by desorption tests and by TG analysis. Adsorptive properties were assessed by means of sorption isotherms towards several nonionic surfactants (NISs): two nonylphenol ethoxylates: NPEO8 and NPEO12 and one fatty alcohol ethoxylate with 10 ethoxy groups, EUSAPON OD. The HDTMA and NCPy-organoclays were effective adsorbents for both nonylphenol and fatty alcohol ethoxylates, with high sorption limits. The DDA-organoclay showed significantly lower sorption limits.The ABDMA proved to be inactive towards the nonionic surfactants.
MONITORING DES POLLUANTS DANS LES EAUX RESIDUELLES RESULTANT DU PROCESSUS DE TEINTURE DES FIBRES SYNTHETIQUES
RADULESCU CRISTIANA*, MOATER ELENA IRINA, HOSSU ANA-MARIA, IONIŢĂ IONICĂ
In present days, an important problem is the presence of different pollutants in wastewaters resulted from textile fabrication, especially from the dyeing process. In Romania the textile industry does not solve yet the problem of pollutants in accordance with the norms of European Union. From this reason many research labs from chemical and environmental areas tried many modern methods for monitoring and degradation of pollutants resulted from textile fabrication. So, in this paper bwere used some physical-chemical analyses (pH, UV-VIS, RMN, HPLC, AAS, etc.) and microbiological tests for identification, control and, finally, degradation (if it is possible) of organic and inorganic pollutants resulted bfrom dyeing synthetic fibers with blue bcationic dyes obtained by original synthesis.
CONCERNANT L`IMPACT ECOLOGIQUE DE CERTAINS FLUIDES DE FORAGE UTILISES DANS L`INDUSTRIE EXTRACTIVE DE PETROLE
MANEA MIHAELA(1), DUSSAP CLAUDE-GILLES(2), TROQUET JULIEN(3)*, AVRAM LAZAR(4)
The composition of drilled materials and the use of drilling fluids are the main factors taken into consideration. By atomic absorption spectrometry (AAS), traces of cadmium, lead, mercury and chromium have been detected. The treatment of drilling fluids has been done in two different manners. The first one supposed the improvement of the circulation/rinsing process of drilling fluids, meanwhile the second focused on more environmental friendly drilling fluids. Both methods are argumented and discussed.
SEPARATION DES IONS METALLIQUES POLLUANTES DE L`EAU AVEC DES MATERIAUX NATURELS A BASE DE LIGNINE ET DE CELLULOSE
SUTEU DANIELA*, VOLF IRINA, RUSU GABRIELA
The metallic ions have an important toxic potential on environment. This makes necessary the treatment of industrial wastewaters before dumping them to sewers or natural receptors. Our research was focused on testing several materials (bio-sorbents) of ligno-cellulosic type (cellolignine and carbon of vegetal origin).
NOVEL COMBINED METHOD FOR LANOLINE RECOVERY FROM SHEEPSKINS TANNERIES WASTEWATERS
MAIER STELIAN-SERGIU*, BUCISCANU INGRID, BADEA NICOLAE
The paper presents a two-stage method for the fast and high-yield recovery of lanoline from spent woolen sheepskin scouring liquors. Through its characteristics, the resulting waxy matter allows a straightforward and efficient purification of lanoline. The first stage involves the selective removal of hydrophilic and medium hydrophobic nonlanoline constituents of the spent liquor, using conventional Al-pillared clays (Al-PILCs). The second stage consists in electrochemical separation of crude waxy matter in electro flotation cells operated in pulse-widthmodulated regime, at constant current density.
AN OXIRANE – PENDANT – GROUPS COPOLYMER, ACTIVE AS SYNTAN IN LEATHER PROCESSING
MAIER STELIAN-SERGIU*, MAIER VASILICA, PRUNEANU MELINDA
The paper presents the synthesis principles of an oligomeric reactive tanning agent useful in leather processing, and the practical synthesis guidelines for a poly[(glycidyl-methacrylate) - co - (fumaric acid) - co - (maleic acid)]. The synthesis pathway is straightforward and avoids the expensive anionic copolymerization techniques but requires the pursuing of a severe procedure for reactions control during the molecular building stages.
EFFET DES POLYMERES ACRYLIQUES SUR LA MICROFLORE DU SOL
SAMSON DIANA-SIMONA*, IRIMIA MARINELA, BOCANU CĂTĂLIN, POPA MARCEL, AELENEI NECULAI
The acrylic copolymers are among the most important polymeric materials, their main destination being the manufacturing of acrylic fibers for the textiles industry. After usage, acrylic fibers represent a pollution source, mainly for the soil. Nowadays there are no specific information concerning the interaction between these polymers and the soil microorganisms, and that’s why our interest in the topic. In this paper we have studied the effect of polyacrylonitrile (PAN) upon the development of different soil microorganisms. Soil samples have been extracted, mixed in various ratios with PAN powder, and returned into the natural environment. After two years, complex chemical and biological analyses have been bperformed on the samples [1]. A first observed effect was the increasing of bvthe mycosis and bacterial colonies number. The more polymer quantity, the bmore increase of colonies. In the same time, a reduction of the number of bmicroorganism species has been observed. These phenomena led us to the conclusion that there are important interactions between soil microorganisms and the synthetic polymers. Several changes of the polymers have been also observed.
ASPECTS DE LA POLLUTION DES SOLS AVEC DU PETROLE ET DE L’EAU SALEE
TRÎMBIŢAŞU EVA*, POPOVICI DANIELA, PÂNTEA OCTAV, ILIESCU RALUCA OANA, MIHAI SONIA
The paper presents a study on the pollution of the soils with oil and salted water. It has been simulated the pollution with oil and salted water of a terrain and it have been extracted samples from 2 cm, 20 cm and 60 cm depth. The samples were analyzed and compared with a sample of unpolluted soil. The researches were used for elaboration of a cleaning technology using specialized microorganisms. The chemical and microbiological characterization of the soils has been realized with standard methods.
DEPOLLUTION A L’AIDE DES MICROORGANISMES DES SOLS CONTAMINES AVEC DU PETROLE ET DE L’EAU SALINE
TRÎMBIŢAŞU EVA*, ILIESCU RALUCA OANA, MATEI DORINA, NEAGOE STELIAN, ŞCHIOPESCU ALEXANDRA
The paper presents aspects on the cleaning of the soils contaminated with oil and salted water by using specialized microorganisms. For the artificial polluted land with oil and salted water has been determined the chemical and microbiological composition and it has been elaborated the pathway for a cleaning technology using microorganisms. Using this technology which involves the neutralization and regeneration of the polluted soils, the equilibrium between mineralization and humification has been reestablished by including the microbial proteins in the ecological cycle, with a very important role in the humification processes.