This paper presents a water meter substitution plan based on a composite "Replacement indicator" ... more This paper presents a water meter substitution plan based on a composite "Replacement indicator" which was defined and compared with common substitution strategies based on meter age and on run-to-fail approaches. The methodology was applied to one of the 17 sub-networks in which the Palermo city water distribution network (Italy) is divided. The analysis was carried out considering a substitution budget limitation and the results showed that the use of "Replacement indicator" outperform the classical substitution strategies based on meter age because it takes into account some other variables that may affect meter precision and wearing.
ABSTRACT In this study, the coagulation and flocculation processes were evaluated in the treatmen... more ABSTRACT In this study, the coagulation and flocculation processes were evaluated in the treatment of slops with the aim of reducing the organic concentration in the pre-treated influent, as measured by Chemical Oxygen Demand (COD), Total Organic Carbon (TOC) and Total Petroleum Hydrocarbons (TPH). The coagulation was optimised for the wastewaters sampled from a floating tank of an oil costal deposit in the Augusta Harbour (Sicily-Italy). The jar test experiments were run at 200 rpm for -1 min, 30 rpm for 20 min and settling for 180 min. Two different trivalent salts were used as the coagulant: FeCl3 and Al-2(SO4)(3) x 18H(2)O. To limit the residual concentration of Al and Fe after coagulation, a low coagulant dose was used. Furthermore, both anionic and cationic polyelectrolytes were used as flocculating agents. In general, the application of the coagulation process with low coagulant doses was effective in the pre-treatment of the slops. In fact, the percentages of removal, although rarely exceeding 70-80% (in term of TOC), reduced the organic load resulting from recalcitrant or poorly biodegradable substances. In particular a pre-treatment, with aluminium sulphate is more versatile for the removal of the main contaminants, that can hinder the performance of subsequent biological processes.
The hydrodynamic circulation in the coastal area of the Augusta Bay (Italy), located in the easte... more The hydrodynamic circulation in the coastal area of the Augusta Bay (Italy), located in the eastern part of Sicily, is analysed. Due to the heavy contamination generated by the several chemical and petrochemical industries active in the zone, the harbour was declared a Contaminated Site of National Interest. To mitigate the risks connected with the industrial activities located near the harbour, it is important to analyse the hydrodynamic circulation in the coastal area. To perform such analysis, a parallel 3D numerical model is used to solve the Reynolds-averaged momentum and mass balance, employing the k-ε turbulence model for the Reynolds stresses. The numerical model is parallelized using the programing technology -Message Passing Interface (MPI) and applying the domain decomposition procedure.
This paper presents a water meter substitution plan based on a composite "Replacement indicator" ... more This paper presents a water meter substitution plan based on a composite "Replacement indicator" which was defined and compared with common substitution strategies based on meter age and on run-to-fail approaches. The methodology was applied to one of the 17 sub-networks in which the Palermo city water distribution network (Italy) is divided. The analysis was carried out considering a substitution budget limitation and the results showed that the use of "Replacement indicator" outperform the classical substitution strategies based on meter age because it takes into account some other variables that may affect meter precision and wearing.
ABSTRACT In this study, the coagulation and flocculation processes were evaluated in the treatmen... more ABSTRACT In this study, the coagulation and flocculation processes were evaluated in the treatment of slops with the aim of reducing the organic concentration in the pre-treated influent, as measured by Chemical Oxygen Demand (COD), Total Organic Carbon (TOC) and Total Petroleum Hydrocarbons (TPH). The coagulation was optimised for the wastewaters sampled from a floating tank of an oil costal deposit in the Augusta Harbour (Sicily-Italy). The jar test experiments were run at 200 rpm for -1 min, 30 rpm for 20 min and settling for 180 min. Two different trivalent salts were used as the coagulant: FeCl3 and Al-2(SO4)(3) x 18H(2)O. To limit the residual concentration of Al and Fe after coagulation, a low coagulant dose was used. Furthermore, both anionic and cationic polyelectrolytes were used as flocculating agents. In general, the application of the coagulation process with low coagulant doses was effective in the pre-treatment of the slops. In fact, the percentages of removal, although rarely exceeding 70-80% (in term of TOC), reduced the organic load resulting from recalcitrant or poorly biodegradable substances. In particular a pre-treatment, with aluminium sulphate is more versatile for the removal of the main contaminants, that can hinder the performance of subsequent biological processes.
The hydrodynamic circulation in the coastal area of the Augusta Bay (Italy), located in the easte... more The hydrodynamic circulation in the coastal area of the Augusta Bay (Italy), located in the eastern part of Sicily, is analysed. Due to the heavy contamination generated by the several chemical and petrochemical industries active in the zone, the harbour was declared a Contaminated Site of National Interest. To mitigate the risks connected with the industrial activities located near the harbour, it is important to analyse the hydrodynamic circulation in the coastal area. To perform such analysis, a parallel 3D numerical model is used to solve the Reynolds-averaged momentum and mass balance, employing the k-ε turbulence model for the Reynolds stresses. The numerical model is parallelized using the programing technology -Message Passing Interface (MPI) and applying the domain decomposition procedure.
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Papers by Gabriele Freni