Selene Grilli - Academia.edu (original) (raw)

Papers by Selene Grilli

This project has received funding from the European Union's Horizon 2020 research and innovation ... more This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 797951 development of bulk, dense pyroelectric ceramics, ideally with a highly developed texture and small grain size, using a micro-sized powder of the ZnS wurtzite phase as precursor material demonstration of the Two-Step Sintering (TSS) process suitability to obtain high density materials with controlled grain growth (comparable density but a finer microstructure than conventional ZnS)

Journal Of Environmental Science And Health, Part A, Nov 1, 2005

In this study, a recently developed methodology for the assessment of the inhibitory effect on ni... more In this study, a recently developed methodology for the assessment of the inhibitory effect on nitrifying biomass was applied to several textile effluents from productive processes. Effluents are classified according to the degree of inhibition as EC50 (concentration producing 50% nitrification inhibition); the investigated textile effluents showed a wide range of EC50 ranging from 20 ml gVSS-1 (83 ml l-1) to values above 100 ml gVSS-1 (300 ml l-1) for effluents produced by rinsing phases. Taking into account biodegradability and toxicity evaluations, most of the effluents showed a good treatability in conventional biological wastewater treatment plant. On the other hand three textile effluents showed significant toxic effects towards nitrifying biomass. In any case, the proposed procedure represents an efficient tool to prevent treatment failures due to toxic discharges.

Open ceramics, Mar 1, 2022

Al lm ma a M Ma at te er r S St tu ud di io or ru um m-U Un ni iv ve er rs si it tà à d di i B Bo... more Al lm ma a M Ma at te er r S St tu ud di io or ru um m-U Un ni iv ve er rs si it tà à d di i B Bo ol lo og gn na a PhD School in Biological, Biomedical and Biotechnological Sciences PhD Program in Cellular, Molecular and Industrial Biology Project n.3: Industrial Microbiology and Biotechnology

The pyroelectric performances of non-ferroelectric pyroelectrics like wurtzite- based materials (... more The pyroelectric performances of non-ferroelectric pyroelectrics like wurtzite- based materials (e.g. AlN, GaN, CdS or ZnO) make them important, although not widely used, compared to the current state-of-the-art ferroelectrics. Their high chemical and thermal stability allows their use at high temperatures in air, whereas ferroelectrics become ineffective when heated beyond their Curie temperature (TC). Wurtzite based materials have a higher thermal conductivity allowing them to react faster to ambient temperature changes, their raw material costs are lower and many of them are eco-friendly. Current pyroelectrics applications are limited to portable systems or tasks needing only μW–mW power. To be commercially viable, we must improve the current low efficiency of pyroelectric systems and intrinsically enhance the pyroelectric properties of modern materials through suitable dopi...

Pyrolectric materials are able to harvest energy both from naturally and artificially occurring t... more Pyrolectric materials are able to harvest energy both from naturally and artificially occurring temperature changes. These materials could be the right way to recover some of the enormous amount of energy wasted as heat and help to develop new devices for harvesting thermal ambient energy. In this work it was investigated the development of bulk, dense pyroelectric ceramics, ideally with a highly developed texture and small grain size, using a micron-sized powder of the ZnS wurtzite phase as precursor material. The Two-Step Sintering (TSS) process is a useful method to obtain high sintered density and to limit the grain growth associated with the final stage of the sintering process. One of the main advantages of this method is the lowering of the sintering temperature. The microstructural, morphological and electrical properties of TSS-ZnS were determined and compared to ZnS produced by the conventional sintering process, performed at 1250°C. TSS-ZnS showed comparable density and a...

The growing interest in environmental protection has led to the development of emerging biotechno... more The growing interest in environmental protection has led to the development of emerging biotechnologies for environmental remediation also introducing the biorefinery concept. This work mainly aimed to evaluate the applicability of innovative biotechnologies for environmental remediation and bioenergy production, throught fermentative processes. The investigated biotechnologies for waste and wastewater treatment and for the valorisation of specific feedstocks and energy recovery, were mainly focused on four research lines. 1. Biotechnology for textile wastewater treatment and water reuse that involving anaerobic and aerobic processes in combination with membrane technologies. Combinations of different treatments were also implemented for water reuse in a textile company. 2. Biotechnology for the treatment of solid waste and leachate in landfill and for biogas production. Landfill operated as Bioreactor with recirculation of the generated leachate was proposed for organic matter bios...

Journal of the European Ceramic Society, 2019

In order to improve the oxidation resistance of C f /Cs produced by chemical vapour infiltration,... more In order to improve the oxidation resistance of C f /Cs produced by chemical vapour infiltration, a multilayer coating based on silicon carbide and molybdenum disilicide was produced by two-step pack cementation technique. The inner SiC layer with a thickness up to 25 μm was obtained without promoted reaction additives by varying the composition, and thermal treatment conditions. The SiC/SiC-MoSi 2 coating was produced with a thickness up to 80 μm by two step pack cementation, considering the effect of the inner layer characteristic. The enhancement of the oxidation resistance, observed in SiC/SiC-MoSi 2 coated C f /Cs by means of thermal analysis in flowing air up to 1500°C, was due to the formation of SiO 2 promoted by the passive oxidation of silicon carbide and molybdenum disilicide.

Water Science and Technology, 2002

In this paper, we describe the results of research aimed to evaluate the possibility of using a n... more In this paper, we describe the results of research aimed to evaluate the possibility of using a neural network (NN) model for predicting biological nitrogen and phosphorus removal processes in activated sludge, utilising oxidation reduction potential (ORP) and pH as NN inputs. Based on N and P concentrations predictions obtained via the NN, a strategy for controlling sequencing batch reactors (SBRs) phases duration, optimising pollutants removal and saving energy, is proposed. The NN model allowed us to reproduce the concentration trends (change in slope, or process end), with satisfactory accuracy. The NN results were generally in good agreement with the experimental data. These results demonstrated that NN models can be used as “soft on-line sensors” for controlling biological processes in SBRs. By monitoring ORP and pH, it is possible to recognise the N and P concentrations during different SBRs phases and, consequently, to identify the end of the biological nutrient removal proc...

$Research paper thumbnail of Stabilisation of biodried municipal solid waste fine fraction in landfill bioreactor$

Waste Management, 2012

The biodrying process of solid waste is a pre-treatment for the bio-stabilisation of the municipa... more The biodrying process of solid waste is a pre-treatment for the bio-stabilisation of the municipal solid waste. This study aims to investigate the fate of the municipal solid waste fine fraction (MSWFF) resulting from a biodrying treatment when disposed in landfills that are operated as bioreactors. Biodried MSWFF was apparently stable due to its low moisture content that slows down the microbial activity. The labscale anaerobic bioreactors demonstrated that a proper moisture content leads to a complete biodegradation of the organic matter contained in the biodried MSWFF. Using a pilot-scale landfill bioreactor (LBR), MSWFF stabilisation was achieved, suggesting that the leachate recirculation could be an effective approach to accomplish the anaerobic biodegradation and biostabilisation of biodried MSWFF after landfilling. The biostabilisation of the material resulting from the LBR treatment was confirmed using anaerobic and aerobic stability indices. All anaerobic and aerobic indices showed a stability increase of approximately 80% of the MSWFF after treatment in the LBR. The similar values of OD7 and BMP stability indices well agree with the relationship between the aerobic and anaerobic indices reported in literature.

Journal of Environmental Science and Health, Part A, 2005

Journal of Environmental Science and Health, Part A, 2011

This study evaluated the treatability of textile wastewaters in a bench-scale experimental system... more This study evaluated the treatability of textile wastewaters in a bench-scale experimental system, comprising an anaerobic biofilter, an anoxic reactor and an aerobic membrane bioreactor (MBR). The MBR effluent was thereafter treated by a nanofiltration (NF) membrane. The proposed system was demonstrated to be effective in the treatment of the textile wastewater under the operating conditions applied in the study. The MBR system achieved a good COD (90-95%) removal; due to the presence of the anaerobic biofilter, also effective color removal was obtained (70%). The addition of the NF membrane allowed the further improvement in COD (50-80%), color (70-90%) and salt removal (60-70% as conductivity). In particular the NF treatment allowed the almost complete removal of the residual color and a reduction of the conductivity such as to achieve water quality suitable for reuse.

International Biodeterioration & Biodegradation, 2010

In this study, an aqueous solution containing the azo dye Reactive Orange 16 (RO16) was subjected... more In this study, an aqueous solution containing the azo dye Reactive Orange 16 (RO16) was subjected to two sequential treatment processes, namely: ozonation and biological treatment in a moving-bed biofilm reactor (MBBR). The most appropriate ozonation pretreatment conditions for the biological process and the toxicity of the by-products resulting from RO16 ozone oxidation were evaluated. The results showed that more than 97 % of color removal from the dye solutions with RO16 concentrations ranging from 25 to 100 mg/L was observed in 5 min of ozone exposure. However, the maximum total organic carbon removal achieved by ozonation was only 48 %, indicating partial mineralization of the dye. Eleven intermediate organic compounds resulting from ozone treatment of RO16 solution were identified by LC/MS analyses at different contact times. The toxicity of the dye-containing solution decreased after 2 min of ozonation, but increased at longer contact times. The results further demonstrated that the ozonolysis products did not affect the performance of the subsequent MBBR, which achieved an average chemical oxygen demand (COD) and ammonium removal of 93 ± 1 and 97 ± 2 %, respectively. A second MBBR system fed with non-ozonated dye-containing wastewater was run in parallel for comparison purposes. This reactor also showed an appreciable COD (90 ± 1 %) and ammonium removal (97 ± 2 %), but was not effective in removing color, which remained practically invariable over the system. The use of short ozonation times (5 min) and a compact MBBR has shown to be effective for the treatment of the simulated textile wastewater containing the RO16 azo dye.

Bioresource Technology, 2013

h i g h l i g h t s " A two-stage anaerobic process for enhancing organic waste codigestion was s... more h i g h l i g h t s " A two-stage anaerobic process for enhancing organic waste codigestion was studied. " The innovative two-stage process designed for reducing footprint. " Cheese whey and cattle manure were codigested. " The highest methane yield was obtained co-treating the two wastes at equal ratio. " The proposed system improved the methanisation yield.

Bioresource Technology, 2012

h i g h l i g h t s " Anaerobic MBR was evaluated for azo dye decolourisation. " MBRs under anaer... more h i g h l i g h t s " Anaerobic MBR was evaluated for azo dye decolourisation. " MBRs under anaerobic conditions achieved very high azo dye decolourisation. " Decolourisation was not significantly affected by azo dye conc. up to 3.2 g L À1. " Methane production was greatly inhibited by the azo dye.

Advances in Science and Technology, 2014

SOREME project (LIFE 11 ENV/IT/109) is aimed at synthesizing an innovative sorbent based on activ... more SOREME project (LIFE 11 ENV/IT/109) is aimed at synthesizing an innovative sorbent based on activated carbon obtained from the carbonization of waste tires. Microstructural characterization was mainly performed in order to define crystallinity, morphology and porosity of the activated carbon powders obtained in different conditions. In particular, XRD analysis always revealed a partially crystalline structure with different crystallite size of the nanographitic structure. The disorder of these structures was determined by Raman spectroscopy. This evaluation was made on the basis of the ratio of the integrated area of the D and G bands typical of the graphitic structure. Finally, SEM was used to put in evidence the mesopores and macropores.