The use of gasoline oxygenated with MTBE (methyl tert-butyl ether) reduced significantly air pollution (16 - 23% lower emissions of CO and 18% lower emissions of unburned hydrocarbons) but increased water pollution. There is no European or national regulations for MTBE in drinking water except for Denmark, which has set a limit value of 30 Âľg/ L for MTBE. USEPA proposed a maximum concentration of 20- 40 Âľg/L. This paper is a review with 70 references on the MTBE production, use, properties and...
Autori: Camelia Beţianu, Florina Ungureanu, Loredana Branza, Lucian Vasile Pavel, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25122

Include urmatoarele articole:� "Waste not, want not" a study of household attitude toward recycling of solid wastes� A kinetic model for the crystal violet mineralization in water by the electro- fenton process� Development of a coagulation/flocculation predictive model for turbidity removal from tehran water treatment plants� Removal of cadmium (II) from aqueous solutions by sphagnum moss peat: Equilibrium study� Environmental sustainability based on fuzzy models� Impact of dust emi...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25207

AbstractSome industry activities in the area of Constanta (Romania) contribute to the polluting of the environment with heavy metals. In order to estimate the pollution level and the danger created by this phenomenon, some analyses are required with regard to determining the concentration of the pollutant metals in plants samples. The investigated metals were determined by flame atomic absorbtion spectrometry in different types of vegetables and fruits, after the chemical mineralization of the s...
Autori: Alina Soceanu, , Simona Dobrinas, Vasile Magearu, Viorica Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25227

AbstractThe mineralization of acidic aqueous solutions with 0.166 to 1.333 mM Crystal Violet (CV) in 50 mM Na2SO4 as background electrolyte has been studied by the electro- Fenton method, where the oxidizing hydroxyl radicals were produced from the Fenton reaction between added ferrous ions and hydrogen peroxide generated at a oxygen- diffusion cathode. The influence of a new operating factor on the mineralization degree has been investigated: anode material (platinum versus boron doped diamond)...
Autori: Carmen-Ionela Alexandru, Eric Brillas, Ilie Siminiceanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25229

AbstractThe paper presents new experimental results on the photodegradation of two important phenyl urea herbicides in water: Monuron and Isoproturon. The photodegradation was performed by two Advanced Oxidation Processes (AOPs): the homogeneous photo- Fenton process (, UV-H2O2 - Fe3+) and a heterogeneous photo - Fenton reaction using an iron pillared Laponide- RD catalyst (Fe-Lap-RD). The Fe-Lap-RD catalyst was prepared from iron nitrate 0.2 M solution and a suspension of Laponite - RD clay. Th...
Autori: Elsa Lundanes, Ilie Siminiceanu, Maria-Magdalena Bobu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25234

AbstractMilk products are a very important human nutrient since their consumption has increased in recent years. Good quality measurements are essential to control and maintain milk products and processes quality, both in manufacturing, trade and in research. The presence of toxic elements in powdered and liquid milk may create significant health problems for people. The aim of this paper was to determine the content of major and minor elements in different milk samples, sold in major supermarke...
Autori: Alina Soceanu, Gabriela Stanciu, , Simona Dobrinas
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25320

Abstract This paper presents the preliminary results of photocatalytic oxidation of humic acid from water using two types of catalysts, i.e., TiO2 and Ag-doped TiO2 modified zeolite (TMZ and Ag-TMZ). TMZ and Ag-TMZ, with zeolite granulation of 315-500 ?Źm was synthesized by sol-gel method, and the morphology and composition of the unmodified/modified zeolite were characterized by BET (Brunauer–Emmet–Teller) method, X-ray Diffraction (XRD), scanning electron microscopy (SEM) and energy dis...
Autori: Cornelia Ratiu, Carmen Lazau, Paula Sfirloaga, Corina Orha, Daniela Sonea, Stefan Novaconi, Florica Manea, Georgeta Burtica, Ioan Grozescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25397

Abstract The analysis over the underground water monitoring system and the collected data from survey drilling show that the underground water has an unsatisfactory quality due to some physical and chemical characteristics. Along with these, factors like the surface water pollution, the hydrodynamic exchange between surface and underground waters and the reintroduction in the agricultural activities of nitrates and phosphorus based fertilizers lowers, as well, the quality that it has been tal...
Autori: Ioan Crăciun, Catrinel-Raluca Giurma-Handley, Ion Giurma
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25436

Abstract The present paper proposes an integrated-treatment process of leachate from a municipal landfill, which involves two treatment steps. The first step consists in diminishing the organic content through an advanced oxidation process using ozone and hydrogen peroxide. The second step is performed in order to diminish the content of heavy metals through a sorption process on a natural low-cost biosorbent, thus the traces of organic substances remained after oxidative degradation or oxida...
Autori: Carmen Paduraru, Corneliu Pohontu, Igor Creţescu, Lavinia Tofan, Marius Sebastian Secula, Matei Macoveanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25589

Chemical composition data of coalbed produced water can provide information to determine the water sources, understand the evolution, select appropriate treatment processes and increase the utilization efficiency of water resources. Based on methods of hydrogeology, water chemistry and environmental chemistry, the characters of coalbed produced water in the Powder River Basin in the USA and Qinshui Basin in China have been analyzed. Conclusions have been drawn as follows: (1) The coalbed produce...
Autori: Guang Xu, Li Tong, Mei Yang, Yi-wen Juhttp://www.ecozone.ro/reviste.php?RID=25715

The aim of this study was to investigate photocatalytic activity of a silver doped TiO2 modified zeolite (Z-TiO2-Ag) in the photocatalytic degradation of Reactive Yellow 125 (RY 125) azo dye. The operational conditions using photocatalyst dose of 1g¡L-1 at pH 6 were established as optimal conditions for photocatalysis application in RY 125 dye solution degradation. The photocatalyst exhibited a good performance for discoloration at all studied concentrations (25, 50 and 100 mgL-1). A go...
Autori: Carmen Lazau, Elida Cristina Ilinoiu, Florica Manea, Liliana Andreea Colar, Rodica Pode
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25854

The composite materials based on natural zeolite and undoped and N-doped TiO2, i.e., Z-Na-TiO2 and Z-Na-TiO2-N, were successfully synthesized by solid-state reaction in microwave-assisted hydrothermal conditions. Undoped TiO2 and N-doped TiO2 nanocrystals were previously synthesized by sol-gel method. The X-rays diffraction results of TiO2 nanocrystals indicated that anatase TiO2 is the dominant crystalline type. The composite materials were structural and morphological characterized by X-ray di...
Autori: Cornelia Bandas (Ratiu), Carmen Lazau, Paula Sfirloaga, Florica Manea, Rodica Pode
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25911

AbstractGroundwater hydrochemical evolution has influences on the rational use and conservation of water resources. This paper whichtakes MapGIS as the platform is aimed at demonstrating the evolution of shallow groundwater hydrochemistry in Guanzhongbasin (China) by adopting mathematical statistics, ratios of ion pair equivalents, geochemical simulation. The direction ofevolution is dependent on the geological, geomorphological, and hydrogeological conditions of the study area. The spatialdistr...
Autori: Hua Tian, Lei Duan, Wenke Wang, Xiaoting Yang
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25956

AbstractA study on the electrochemical decolourisation, aromatic ring degradation and mineralization of Reactive Red 147 (RR) syntheticsolutions using boron-doped diamond (BDD) electrodes is presented. Electrolyses were carried out under galvanostaticconditions in 0.1 M Na2SO4 supporting electrolyte using undivided electrolytic cell. Prior to electrolysis application, theelectrochemical behaviour of BDD electrode was characterized in the presence of RR dye by cyclic voltammetry in order toestabl...
Autori: Sorina Moţoc
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26089

Abstract This paper develops a procedure whereby breakthrough curves obtained experimentally for ion exchange process in fixed bed ion mixed exchangers during water demineralization, can be used to characterize quantitatively and optimize the ion exchange process. In this regard, based on breakthrough curves there were developed statistical models that correlate three important factors which influence the process (superficial fluid velocity through the layer, changing layer height,...
Autori: Iuliana Rogoveanu Radosavlevici
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26147

AbstractExcess biomass produced in the degradation processes of organic pollutants is creating environmental challenges for wastewatertreatment plants. The A+OSA system, a modification of the anoxic / oxic (A/O) process via insertion of a sludge holding tankinto a sludge return line, has been demonstrated to be capable of achieving simultaneous nutrient removal and sludge reduction.Here we report the results of an investigation aimed at evaluating the impact of the sludge holding tank on the bio...
Autori: Li Jia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26207

AbstractThe aim of this study is to evaluate the treatment performance of mono azo dye Methyl Orange (MO)-containing wastewater byrecirculated up-flow constructed wetland (UFCW) with and without supplementary aeration. The successive anaerobic andaerobic treatment of the UFCW reactors could effectively remove color, organic matters and intermediate aromatic aminessimultaneously in a single reactor. With influent 50 mg/L of MO, the removal efficiencies of COD and MO were 91 and 75 %,respectively,...
Autori: Soon-An Ong
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26254

AbstractDue to its toxicity, persistence in the environment and specific properties, 1,2-dichlorobenzene (DCB) has been listed as apriority pollutant by the European Agency. In this study, the oxidation with ozone alone as well as in combination withultraviolet irradiation was applied for the degradation of DCB. This article presents the abatements obtained, after the varioustreatments proposed, in the levels of chemical pollution as monitored by chromatographic techniques (GC/ECD, GC/MS andHPLC...
Autori: Bertrand Sancey, Corina Bradu, Grégorio Crini
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26328

AbstractEnhanced nitrogen inputs to both terrestrial and aquatic ecosystems affects biodiversity at all its levels. Grasslands provide acomplex range of functions, due to their wide representation throughout terrestrial ecosystems. Numerous studies demonstratesoil acidification, eutrophication and species richness reduction as a result of elevated reactive nitrogen availability. The presentstudy aims to assess soil nitrogen stocks and transformations for two Romanian grasslands during November 2...
Autori: Carmen Postolache
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26497

AbstractThe objective was to study the degradation of azo dye C.I. Acid Orange 7 (AO7) and intermediates for its synthesis sulphanilicacid (SA) and 2-naphthol (2-N) by Fenton process. Full factorial design and response surface methodology were applied to modelthe system behavior influenced by studied process parameters ([Fe2+] and [H2O2]).Optimal process conditions were determined on the basis of mineralization efficiency. The effectiveness evaluation of appliedtreatment process was conducted on...
Autori: Sanja Papić
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26569

Abstract Nowadays, an efficient wastewater management involves the use of advanced treatment technologies able to decompose hardly biodegradable compounds with reasonable costs at the lowest possible environmental impact. In our work we used one of the most efficient advanced wastewater treatment, the Fenton reaction and its photo-assisted version. The hydrogen peroxide was the oxidizer; despite its relatively high cost, its high activity in oxidizing of a large variety of organic persistent...
Autori: Vasilica-Ancuta Simion
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26677

Abstract In the process of chitin extraction, shrimp shell powder was treated by Lactobacillus plantarum culture. The efficiency of microbial demineralization (DM) under aerobic and anaerobic conditions was investigated. The shrimp shell powder was incubated at 30 °C for 6 days with L. plantarum. In order to prepare microbial culture, inoculums size was 5% for culture inoculation. Date syrup with total reduce sugar concentration of 30 g.L-1 was used. The value of pH in anaerobic conditio...
Autori: Marjan Khorrami
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26692

Abstract The objective of this study was to identify differences between three of the most conventional UV-based advanced oxidation processes, namely photolysis, UV/TiO2, and UV/ZnO for the decolorization and mineralization of reactive red 198 (RR198) model dye in saline media. The study investigated influences of solution pH levels, salt concentration, reaction time and dye concentration on the degradation of RR198. The most effective dye removal and mineralization was observed at pH levels...
Autori: Gholamreza Moussavi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26724

Abstract The present work systematically investigates the photocatalytic degradation of carbamazepine (CBZ), an organic compound, known as refractory to the conventional wastewater treatment by the titanium dioxide PC 500 catalyst. The effects of some fundamental operating parameters in heterogeneous photocatalysis were investigated in this work in order to determine the main ones affecting the degradation kinetics. The obtained results clearly showed that the removal rate of the target comp...
Autori: Lidia Favier
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26754

Abstract Diclofenac (DCF), which belongs to nonsteroidal anti-inflammatory drugs (NSAIDs), is a biorefractory micropollutant and its removal from wastewaters has become strongly necessary. This paper dealt with the DCF removal from aqueous solutions by electrooxidation at boron-doped diamond (BDD) electrode. In addition, the dual character of BDD electrode in electrochemical degradation processes and their control was investigated. The electrooxidation process was assessed based on ultraviol...
Autori: Monica Ihos
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26755

The influence of key process parameters of homogenous catalytic ozonation using ferrous or manganese catalysts on the mineralization rate of salicylic acid (SA), model pharmaceutical pollutant, in water was investigated. In order to assess the combined influence and interactions of studied process parameters as well, the empirical/statistical approach applying Box- Behnken experimental design (BBD) combined with response surface methodology (RSM) was applied. Three numerical and one categori...
Autori: Kresimir Koricic
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26939

Recently, environmental scientists have been focused their attention on the occurrence and the elimination of specific organic compounds in water. Among them, chlorophenols are considered to be a public health problem due to their carcinogenic properties. Thus, there is an important need to find new strategies to efficiently transform these compounds to no toxic or inactive by-products. In this work the photocatalytic removal of 2,4-dichlorophenol in water solution was investigated at laborat...
Autori: Lidia Favier
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27034

Carbadox is a veterinary antibiotic and widely used in livestock production as feed additives. Carbadox and its metabolites have the potential of provoking a tumor-inducing mutation. In this study, the influence of carbadox addition on composting performance and its removal during thermophilic composting were investigated. The results showed that the carbadox addition slightly influenced pH variation and C/N ratio, and also improved the decomposition of organic matter. However, XRD analysis indi...
Autori: Lin Shi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27147

Conversion of natural ecological systems has been one of the greatest human impact on terrestrial ecosystems. The expansion of anthroposphere altered virtually all biogeochemical cycles of elements. Nitrogen holds a key place in sustaining life and presents unique traits such as broad chemical speciation and mobility within the environmental compartments. With historically adapted ecosystems to low bioavailable nitrogen, understanding the complexity of the nitrogen disruption is a continuous cha...
Autori: Andreea Csolti
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27329

Mining activity implies a series of environmental issues that can have short or long term consequences: deterioration of natural landscape, air, water and soil pollution, negative impact on aquatic and terrestrial ecosystems and on human health. The present study was performed on a mine dump from the Giumalau Mountains, Eastern Carpathians, Romania. A number of 28 samples were collected and analysed by ICP-MS for 9 minor elements (As, Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn) and also by XRD for the m...
Autori: Madalina Paiu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27330

A comparative study of humic substances (HS) extracted from raw sludge and its digested product was carried out in order to analyze HS evolution during sludge anaerobic digestion. HS content, elemental composition, functional groups, infrared spectra and ultraviolet absorbances were analyzed by means of chemical and spectrographic methods. The extracted HS were also fractionated by ultrafiltration in order to obtain their molecular weight (MW) distribution. The results showed that humic acids (...
Autori: Huan Li
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27390

The aim of this study is the treatment of Chlorothiazide in an aqueous medium by Electro-Fenton process using a Platinum anode. This pharmaceutical product is used to treat hypertension. Removal rates and mineralization efficiency have been analyzed under different operational conditions. Degradation kinetics well fitted to a pseudo–first–order reaction. Apparent rate constant of the oxidation of Chlorothiazide by electrochemically generated hydroxyl radicals was determined to be 9.4...
Autori: Saied Taieb
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27616

The mineralization of azo dyes could be realized through solar photocatalytic degradation that is a green method where non-harmful end products are produced. The aim of this study was to investigate the mineralization of Orange G (OG) and New Coccine (NC) using ZnO as catalyst. The degradation of the azo dyes was conducted at different experimental conditions, and parameters such as effect of sunlight to the degradation rate, initial azo dye concentration, amounts of catalyst dosage, pH and effe...
Autori: Wan Fadhilah Khalik
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27643

The objectives of this study were to investigate: a) whether the duration of organic farming influences the dimension, shape and geometry (fractal dimension) of soil micropores (<50μm) and b) for relationships of morphometric traits with certain chemical and biochemical soil variables (microbial biomass, N- and C-mineralization rates, NH4+, NO3-, organic C and N, extractable P, Mg+2, K+, Ca+2). We compared soil micromorphometric traits (area, perimeter, compactness, solidity, eccentricity)...
Autori: Nikolaos Monokrousos
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27682

Leather manufacturing process generates significant volume of wastewater. Deliming is one of the unit processes, in which about 4.5 L of wastewater is generated per one Kg of pelt. Reuse of wastewater from the unit processes, where significant volume of wastewater is generated is much important to address pollution mineralization and water conservation. Presence of significant level of organic pollutants is the primary factor that deters reuse of waste streams. In this paper, the Electro-Oxidati...
Autori: Sundaramoorthy Sundarapandiyan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27744

Little is known about the degradation kinetics of sewage sludge, sanitized with Ca(OH)2, in soil. Thus, this work aimed to monitor the degradation of limed sludge, under field conditions, when applied on soil surface or incorporated into the soil. The limed sludge was applied in dystrophic Inceptisol at a dose of 500 kg ha-1 yr-1 of total nitrogen. The mineralization process in the soil was monitored for 131 days. Samples of organic material were collected for analysis of total and easily oxi...
Autori: Isabela Diniz
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27995

The main objective of the research was to study the efficiency of the glyphosate amine pesticide mineralization in wastewaters (real and model type of wastewaters respectively) using ozonation treatment as an advanced oxidation processes (AOP). The wastewater samples (model wastewater) were obtained by mixing a given volume of the stock solution prepared from glyphosate isopropyl-amine in different volumetric ratios with distillated water and with real wastewater obtained from a domestic wastewa...
Autori: József Németh
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28050

The contamination of aquatic and terrestrial environments by pesticides is highlighted by their possible toxic properties and poor biodegradability on the environment. The development of low cost by products from agricultural sectors as a suitable solution for contaminated areas remediation is of great environmental interest. Straw wastes can be considered as a promising alternative to remove different chemical compound that are environmentally toxic. In this study, some materials derived from ...
Autori: Irina Gabriela Cara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28161