Maria Martin

Maria Martin
Universitat de Girona | UDG · LEQUIA Laboratory of Chemical and Environmental Engineering

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56
Publications
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Publications

Publications (56)
Article
This work draws on the concept of circular economy (CE) to advance knowledge toward the obtention of low-cost and sustainable activated carbons from a biocollagenic waste from the leather industry, and using them in biogas upgrading for energy recovery. The research pursues a series of benefits across different industrial applications. The first is...
Article
Full-text available
Drinking water production is subject to multiple water quality requirements such as minimizing disinfection byproducts (DBPs) formation, which are highly related to natural organic matter (NOM) content. For water treatment, coagulation is a key process for removing water pollutants and, as such, is widely implemented in drinking water treatment pla...
Article
Sewage biogas valorization to different energy applications is hampered by the presence of volatile methyl siloxanes. Despite the high operating costs, adsorption onto activated carbon is the most implemented technology for siloxane removal from biogas. In order to purify biogas sustainably, the current work explores the diffusion of siloxanes (oct...
Article
The removal of siloxanes (D4 and D5) and volatile organic contaminants (hexane, toluene and limonene) typically found in sewage biogas was investigated in a lab-scale biotrickling filter (BTF) packed with lava rock under anoxic conditions. Complete removal efficiencies for toluene and limonene were recorded at all empty bed residence time (EBRT) te...
Article
Full-text available
Biogas production is a growing market and the existing conversion technologies require different biogas quality and characteristics. In pursuance of assisting decision-makers in biogas upgrading an environmental decision support system (EDSS) was developed. Since the field is rapidly progressing, this tool is easily updatable with new data from tec...
Article
The present paper evaluates the efficiency of sustainable activated carbons obtained from the valorization of lignocellulosic waste in removing siloxanes and volatile organic compounds for the purification of anaerobic digester biogas. Pyrolized and non-pyrolized lignocellulosic residues generated in food and wood industries were used as precursor...
Article
Biogas, produced in anaerobic digesters, is used as a renewable fuel after undergoing several upgrading processes. Adsorption onto activated carbon is the most widely used technology to remove harmful volatile compounds, such as siloxanes. However, the competition for the adsorptive sites with other biogas impurities reduces the performance of the...
Article
Natural and synthetic zeolites with different properties (porous structure, SiO2/Al2O3 ratio, acidity and Fe-loading) were evaluated as adsorbents/catalysts for octamethylcyclotetrasiloxane (D4) removal in dynamic adsorption tests. BEA type zeolites, with high content of Lewis and Brønsted sites, promoted the catalytic D4 ring-opening leading on th...
Article
A commercial activated carbon (AC) was modified by gamma irradiation and was tested as adsorbent for the removal of ethyl mercaptan, dimethyl disulfide and dimethyl disulfide in wet conditions. Modifications were carried out under five different conditions: irradiation in absence of water, in presence of ultrapure water, in ultrapure water at pH=1....
Article
Emission of odours during the thermal drying in sludge handling processes is one of the main sources of odour problems in wastewater treatment plants. The objective of this work was to assess the use of the response surface methodology as a technique to optimize the chemical conditioning process of undigested sewage sludges, in order to improve the...
Article
In the context of the biogas upgrading, siloxane exhausted activated carbons need to be regenerated in order to avoid them becoming a residue. In this work, two commercial activate carbons which were proved to be efficient in the removal of octamethylcyclotetrasiloxane (D4) from biogas, have been regenerated through advanced oxidation processes usi...
Article
The effectiveness of different advanced oxidation processes on the treatment of a multicomponent aqueous solution containing ethyl mercaptan, dimethyl sulphide and dimethyl disulphide (0.5mgL(-1) of each sulphur compound) was investigated with the objective to assess which one is the most suitable treatment to be coupled in wet scrubbers used in od...
Article
Twelve commercial activated carbons (ACs) have been tested for the removal of octamethylcyclotetrasiloxane (D4) in dynamic adsorption experiments using different carrier gases and D4 concentrations. Characterization of the ACs included several physical and chemical techniques. The D4 adsorption capacities were strongly related with the textural dev...
Data
The effectiveness of different advanced oxidation processes on the treatment of a multicomponent aque-ous solution containing ethyl mercaptan, dimethyl sulphide and dimethyl disulphide (0.5 mg L -1 of each sulphur compound) was investigated with the objective to assess which one is the most suitable treat-ment to be coupled in wet scrubbers used in...
Article
The effect of physical and chemical properties of activated carbon (AC) on the adsorption of ethyl mercaptan, dimethyl sulphide and dimethyl disulphide was investigated by treating a commercial AC with nitric acid and ozone. The chemical properties of ACs were characterised by temperature programme desorption and X-ray photoelectron spectroscopy. A...
Article
This study reports the sequential regeneration treatment of activated carbons (ACs) saturated with volatile organic compounds (VOCs) of different polarity using H(2)O(2) as oxidizing agent. In this process, VOCs were adsorbed onto the AC and further oxidized by H(2)O(2). A commercial AC was selected and saturated with three different VOCs: two non-...
Article
Slags collected from the basic oxygen furnaces of two Linz-Donawitz steel making plants were tested as adsorbents for H(2)S removal at room temperature (298 K). Two different particle size fractions, namely <212 and 212-500 μm, were selected from the original slag samples. Dynamic adsorption tests were carried out using a column-bed configuration a...
Article
This paper focuses on the study of photo-Fenton-like processes using two types of Fe-zeolites (Fe-ZSM5 and Fe-Beta) as heterogeneous catalysts in order to treat contaminated effluents with organic compounds at neutral pH. It was proved that light (solar and artificial) improves significantly the DOC removal in this kind of processes. A possible con...
Article
Adsorbents from pyrolysed sewage–sludge were prepared following two different methodologies, namely acid washing and activation with alkaline hydroxides. Air streams loaded with low concentrations (<100 ppm, v/v) of three VOCs linked to odour episodes in wastewater treatment facilities (toluene, methyl ethyl ketone and limonene) were used in dynami...
Article
The robustness of a conventional biofilter and an air diffusion bioreactor (ADB) was comparatively evaluated in laboratory-scale plants treating a mixture of H2S, butanone, toluene and alpha-pinene at gas residence times of 50 s. Under steady state conditions, H2S, butanone and toluene were almost completely degraded, while alpha-pinene removal did...
Article
The observation that carbon activation by KOH gives rise to a significant formation of cyanide moieties is confirmed. However, contrary to what has been reported, our results show that the N2 used as an atmosphere during the activation process has little to do with the formation of such cyanide moieties. The main source of cyanides is ascribed to s...
Article
Full-text available
This paper discusses H(2)S, NH(3) and VOCs removal by sewage-sludge-derived materials with outstanding chemical and textural properties. These materials were obtained from different precursors using different chemical and thermal treatments. Results show that the H(2)S removal process entailed a catalytic conversion of H(2)S to S or SO(4) (2-) spec...
Article
The present work extends previous activation results obtained with a sewage sludge to others and deepens into the study and characterisation of sewage sludge-based sorbents prepared by alkaline hydroxide activation. Results obtained show that different sewage sludges, whose compositions and treatments vary from each other, can be successfully activ...
Article
3 pages, 2 figures, 1 table.-- Available online Oct 26, 2007. The use of activated carbons (ACs) for environmental applications is widening as new challenges emerge. In recent years, for example, particular attention has been focused on ammonia abatement at room temperature. This particular interest is closely related to odour control issues. NH3 i...
Article
The present paper discusses H2S removal by a new generation of sewage-sludge-derived materials which are characterized by their outstanding textural properties when compared to previous materials obtained by pyrolysis and/or activation of similar precursors. Alkaline hydroxide activation was used to prepare adsorbents/catalysts covering a wide rang...
Article
A comparative Life Cycle Assessment (LCA) concerning two strategies for coupling advanced oxidation processes (AOPs) with biological treatment, namely solar-driven photo-Fenton and ozonation, is performed. In addition, these emergent technologies are compared to a reference technology, namely granular activated carbon (GAQ adsorption. The study is...
Article
This paper focuses on the valorisation of solid residues obtained from the thermal treatment of sewage sludge. In particular, sewage sludge samples were collected from two waste water treatment plants (WWTPs) with different sludge line basic operations. After drying, sludges were heated up to 700 °C in appropriate ovens under diluted air (gasificat...
Article
This paper focuses on physical activation (CO2) and chemical activation (H3PO4, NaOH and KOH) of sewage sludge-based precursors. Our results show that (i) a simple acid washing treatment leads to a significant increase in the adsorption capacity of some precursors; (ii) under the experimental conditions tested, CO2 physical activation and chemical...
Article
The use of sewage sludge as a precursor of adsorbent/ catalyst materials for environmental applications has been encouraged during the past few years. Due to the heterogeneous nature of sludges, there exists a lack of information regarding the characteristics of these low-cost precursors and how their physicochemical properties affect the final per...
Article
A comprehensive assessment of nitrogen metabolism in Catalonia (NE region of Spain) has been performed by the method of Substance Flow Analysis (SFA). Being agriculture soils and livestock sectors where the human food production stands, this paper is focused in the analysis of nitrogen dynamics in these sectors. Groundwater contamination, nitrogen...
Article
Full-text available
Background, Aims and Scope Huge amounts of sewage sludge, that need to be handled, are generated all around the world from wastewater treatment plants and its management in an economically and environmentally acceptable way has become a matter of increasing importance during the last few years. In this paper, we make use of Life Cycle Assessment (L...
Article
In this study, waste biological sludge is converted to an adsorbent by chemical activation with sulphuric acid. The adsorbent obtained is then applied to the aerated vessel of an activated sludge process treating glucose and phenol to improve the quality of the treated effluent. The sludge-based carbonaceous adsorbent was found to be mesoporous in...
Article
In this study, waste biological sludge is converted to an adsorbent by chemical activation with sulphuric acid. The adsorbent obtained is then applied to the aerated vessel of an activated sludge process treating glucose and phenol to improve the quality of the treated effluent. The sludge-based carbonaceous adsorbent was found to be mesoporous in...
Article
Surplus biological sludge from wastewater treatment plants was pyrolysed at 700 °C in the presence of H2SO4. Sludge-based (SB) activated carbon (AC) was mainly mesoporous in nature, with a surface area of 253 m2/g and an average pore diameter of 2.3 nm. Chemviron GW, an AC commercial reference, was mainly microporous with a surface area of 1026 m2/...
Article
Surplus sludge produced during the biological treatment of wastewater requires costly disposal procedures. With increasing environmental and legislative constraints, increasing sludge production and more limited disposal options, new recycling alternatives have to be found. The possibility of obtaining activated carbons from surplus biological slud...
Article
Surplus biological sludge from wastewater treatment operations was converted into activated carbon and then added to the aerated vessel of an activated sludge process treating phenol and glucose. The addition of activated carbon, either sludge-based or commercial, enhanced phenol removal from 58 to 98.7% and from 87 to 93% for COD with feed concent...
Article
Successful integration of Cleaner Production concepts and technologies into businesses and industries requires effective education and training of the professionals. Cleaner Production, in spite of its conceptual simplicity, implies a new way of thinking about processes and products and a more sustainable approach to problem solving. Teaching unive...
Article
Full-text available
The great complexity of the nitrogen cycle, including anthropogenic contributions, makes it necessary to carry out local studies, which allow us to identify the specific cause-effect links in a particular society. Models of local societies that are based on methods such as Substance Flow Analysis (SFA), which study and characterise the performance...
Article
Surplus biological sludge can be used as a low-cost adsorbent in the removal of heavy metal from wastewater. A three-zone contact–settling pilot plant was designed and operated to maintain continuous sludge–metal solution contact and subsequent separation of solid–liquid phases, all in the same vessel. Mild agitation was used to ensure good contact...
Article
The field of environmental science and engineering is rapidly evolving. The focus has shifted more and more from the end-of-pipe to pollution-prevention oriented strategies for sustainability. Cleaner production requires new attitudes, knowledge and skills for all professionals to assure that preventive environmental strategies are integrated into...
Article
Adsorption of Cd (II), Cu (II), Ni (II), and Zn (II) from aqueous solutions on anaerobically digested sludge has been investigated. Experimental data has been fit to Langmuir, Freundlich, and Redlich-Peterson isotherms to obtain the characteristic parameters of each model. Based on the maximum adsorption capacity obtained from the Langmuir and the...
Article
The transformation of surplus biological sludge to activated carbon by chemical activation with H2SO4 and ZnCl2 was investigated. The best result was obtained by pyrolysis and activation at 500°C for one hour with H2SO4. The surface area of the product was 257 m2 per gram. The quality of the carbons was tested for the aqueous phase phenol uptake an...
Article
Full-text available
A study has been conducted to establish conditions for the pyrolysis of leather wastes (LW) in order to recover gas and condensable fractions. The pyrolized sample was later activated by means of alkaline hydroxides in order to develop its porous structure. The activated carbons prepared are microporous with specific surface area values up to 2700...
Article
Full-text available
Various solid residues from steel industry were tested as adsorbents of hydrogen sulfide at high concentrations. Their performance towards the removal of thiocyanates from aqueous solutions was also studied. The H 2 S adsorption capacity was evaluated at room temperature under both dry and wet conditions. The removal efficiency for thiocyanate ions...

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