Daniela Spiga

Daniela Spiga
Università degli studi di Cagliari | UNICA · Department of Civil, Environmental and Architectural Engineering

PhD Environmental Engineer

About

25
Publications
4,560
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633
Citations

Publications

Publications (25)
Article
Cheese whey (CW) is the main by-product of the dairy industry and is often considered one of the main agro-industrial biowaste streams to handle, especially within the European Union, where the diary activities play an essential role in the agrarian economy. In the paper, Life Cycle Assessment (LCA) is used to analyse the feasibility of producing p...
Conference Paper
In the present study, combined recovery of biohydrogen and polyhydroxyalkanoate (PHA) from sheep cheese whey (SCW) was investigated through a 3-stage treatment (dark fermentation, PHA-accumulating microorganisms selection and PHA accumulation process). Batch dark fermentation (DF) tests (I stage) were performed on raw SCW adopting two different pH...
Article
Production of volatile fatty acids (VFAs), fundamental building blocks for the chemical industry, depends on fossil fuels but organic waste is an emerging alternative substrate. Lactate produced from sugar-containing waste streams can be further processed to VFAs. In this study, electrofermentation (EF) in a two-chamber cell is proposed to enhance...
Article
Full-text available
With an estimated worldwide production of 190 billion kg per year, and due to its high organic load, cheese whey represents a huge opportunity for bioenergy and biochemicals production. Several physical, chemical and biological processes have been proposed to valorise cheese whey by producing biofuels (methane, hydrogen, and ethanol), electric ener...
Article
The concept of biorefinery expands the possibilities to extract value from organic matter in form of either bespoke crops or organic waste. The viability of biorefinery schemes depends on the recovery of higher-value chemicals with potential for a wide distribution and an untapped marketability. The feasibility of biorefining organic waste is enhan...
Conference Paper
In the present study, PHA production from sheep cheese whey (SCW) through a 3-stage process (dark fermentation, PHA-biomass selection and PHA accumulation process) was investigated. To this aim, batch dark fermentation (DF) tests were performed on raw SCW without any addition of biomass inoculum nor any pre-treatment of the substrate and adopting d...
Conference Paper
In the present study, PHA production from ovine cheese whey (oCW) through a 3-step process (dark fermentation, biomass selection and PHA accumulation process) was investigated. Different operating pHs were adopted during the fermentation step and no external nutrients were supplied at any step of the process. Results showed that the production of P...
Article
Batch dark fermentation tests were performed on sheep cheese whey without inoculum addition at different operating pHs, relating the type and production yields of the observed gaseous and liquid by-products to the evolution of fermentation. Cheese whey fermentation evolved over time in two steps, involving an initial conversion of carbohydrates to...
Article
Full-text available
In the present laboratory-scale study, the combination of washing and carbonation processes was examined to evaluate the feasibility to reduce the environmental impact of coal power plants. Three different washing solutions (tap, distilled and sea water) were used to pre-treat coal fly ash and the corresponding effect on direct gas-solid carbonatio...
Article
Ash generated by biomass combustion has been envisaged as a potential composting additive in order to address some of the most common critical issues concerning the composting process and final product quality. Nonetheless, a deeper awareness for the effective feasibility of such ash reuse option should be pursued. In this work, all the ash types p...
Article
Factorial fermentation experiments on food waste (FW) inoculated with activated sludge (AS) were conducted to investigate the effects of pH and the inoculum-to-substrate ratio (ISR [g VSAS/g TOCFW]) on biohydrogen production. The two parameters affected the H2 yield, the fermentation rate and the biochemical pathways. The minimum and maximum yields...
Article
Full-text available
In this study, the influence of the inoculum-to-substrate ratio (ISR) on dark fermentative hydrogen production from food waste (FW) was evaluated. ISR values ranging from 0.05 to 0.25 g VSinoculum/g VSsubstrate were investigated by performing batch tests at T = 39 °C and pH = 6.5, the latter being the optimal value identified based on a previous st...
Conference Paper
Cheese whey (CW) is the main by-product of the cheese making process and is composed mainly by lactose, proteins, lipids and mineral salts. The environmental impacts and other potential negative effects linked to the traditional management strategies of CW are no longer considered sustainable, therefore alternatives need to be explored. Dark fermen...
Article
In this work the effects of selected types of biomass ash on the composting process and final product quality were studied by conducting a 96-day long experiment where the source separated organic fraction of municipal waste, mixed with wood prunings that served as bulking agent, was added with 0%, 2%, 4% and 8% wt/wt of biomass ash. The evolution...
Article
Coal ashes are normally considered as a waste obtained by the coal combustion in thermal power plants. Their utilization inside the site where are produced represents an important example of sustainable process integration. The present study was performed to evaluate the application of a gas-solid carbonation treatment on coal fly ash in order to a...
Article
Hydrogen production from cheese whey through dark fermentation was investigated in this study in order to systematically analyse the effects of the operating pH. The effluents from pecorino cheese and mozzarella cheese production were the substrates used for the fermentation tests. Either CW only or a mixture of CW and heat-shocked activated sludge...
Article
Batch dark fermentation experiments were performed on food waste and mixtures of food waste and wastewater activated sludge to evaluate the influence of pH on biological H2 production and compare the process performance with and without inoculum addition. The effect of a preliminary thermal shock treatment of the inoculum was also investigated as a...
Article
Full-text available
A reactive barrier (RB) of transformed red mud (TRM), a by-product of the refinement of bauxite in alumina production, was placed adjacent to the anode of an electrokinetic (EK) system with the aim of enhancing removal of chromium or arsenic, added singly to a low permeability clayey soil, and favouring entrapment. The innovative study focused on e...

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Project
The GRRinPORT Project (Sustainable management of waste and wastewater in ports) promotes sustainable practices to improve the quality of marine waters in ports by limiting the environmental impact of port activity and maritime traffic. GRRinPORT aims to define a set of good practices for the management of waste and wastewater according to the principles of resource enhancement and circular economy. The expected outcomes of GRRinPORT are the development of Action Plans for a) sustainable management of waste, wastewater, and sediments dredged in ports, b) pilot applications of the most appropriate contamination remediation techniques for dredged sediments, and c) creation of an integrated and environmentally friendly system for hydrocarbon spill containment and removal and wastewater collection from pleasure crafts.