Search results for "sanita"
showing 10 items of 855 documents
I contributi inquinanti dei sistemi di drenaggio urbano: considerazioni procedurali e tecnologiche
2008
l'acqua è un bene
Il destino dei microinquinanti negli impianti di depurazione e nei corpi idrici.
2016
• Monitoraggio di droghe in quattro impianti di depurazione siciliani e in un corpo idrico ricettore. • Elevata presenza nei reflui influenti a tutti gli impianti monitorati di THC-COOH e BEG, metaboliti rispettivamente della cannabis e della cocaina. • Fenomeni di degradazione naturale ad opera del biota e/o di accumulo nei sedimenti del corpo idrico ricettore comportano la riduzione delle concentrazione di THC-COOH.
Enhanced Sewage Sludge Drying with a Modified Solar Greenhouse
2022
This work reports the results obtained with an innovative configuration of a closed-static solar greenhouse for sludge drying. The novelty of the solar greenhouse configuration consisted in using a forced ventilation system to provide hot air for sludge drying and the utilization of solar irradiation for energy supply. Wet sewage sludge (97% humidity) was successfully dried up to a residual humidity close to 5% after 25 days during wintertime. The increase of the airflow rate supplied under the sludge bed improved the sludge drying rate. Moreover, the fraction of volatile suspended solids decreased from 70% to 41% after 13 days, indicating that air supply promoted the simultaneous stabiliza…
Il destino dei microinquinanti negli impianti di depurazione
2017
La problematica dell’inquinamento prodotta dai microinquinanti, cioè da sostanze presenti in tracce nei corpi ricettori, ma aventi caratteristiche tali da comportare possibili danni per l’ambiente e per l’uomo, ha assunto un’importanza sempre crescente nell’ultimo ventennio. Infatti essa è ormai oggetto di diversi interventi normativi a livello comunitario e nazionale, che hanno individuato un elenco di sostanze definire “prioritarie” e “pericolose prioritarie”, di cui sono state fissate le concentrazioni massime per i corpi ricettori al fine di garantire voluti livelli di qualità ambientale; a queste si aggiunge un elenco molto numeroso di “contaminanti emergenti”, non ancora oggetto di no…
The GSA-GLUE approach for uncertainty assessment of an integrated MBR model
2012
In the recent literature, the uncertainty of wastewater treatment plant (WWTP) modelling has had relevant interest both for designers and operators. Indeed, the frequent data lacking and the need to improve process knowledge, in case of innovative technologies, make the use of mathematical models more uncertain. Therefore, the need to make model uncertainty more explicit is warmly recommended. However, only few applications of uncertainty analysis in the wastewater field have been carried out. In this work, the combination of the global sensitivity analysis (GSA) and the Generalized Likelihood Uncertainty Estimation (GLUE) is applied for the uncertainty assessment of a WWTP model, in order …
Towards a conceptual mathematical tool linking physical and biological processes for a reduction of ghg emissions from an mb-mbr plant
2016
The current study explores the influence of the air flow rate on greenhouse gas (GHG) emissions (direct and indirect), the operational costs (OCs), the effluent quality index (EQI) and effluent fines (EF). An University Cape Town (UCT) moving bed (MB) membrane bioreactor (MBR) pilot plant has been considered as case study where the influence of the air flow rate on the biological and physical processes has been analyzed. Constitutive relationships between the air flow rate and some performance indicators (i.e., EQI, OCs, direct and indirect GHG emissions) have been identified. Results showed that the EQI increases at low flow rate likely due to the dissolved oxygen (DO) limitation in the bi…
Aerobic Granular Sludge for Leachate Treatment
2014
The treatment of municipal landfill leachate by means of aerobic granular sequencing batch reactors (GSBRs) was investigated. The paper reports the results from an experimental campaign lasted 100 days, which has been divided into three periods: cultivation of granular sludge (70 days), operation with semi-fresh (15 day) and diluted landfill leachate (15 day). Two different GSBR configurations were used: a Sequencing Batch Bubble Column reactor and a Sequencing Batch Airlift Reactor. All reactors were operated at Volume Loading Rates (VLRs) between 4.8 and 7.2 g COD /(m 3 ·d). The Chemical Oxygen Demand (COD) removal efficiency varied between 80% and 90% under operation with synthetic waste…
STERILIZZAZIONE CON MICROONDE DI RIFIUTI SANITARI: DETERMINAZIONE DIRETTA DELL’EFFICACIA DEL PROCESSO
2018
In the sterilization of those Health Care Waste that are marked as possibly infectious, microwaves (MW) have long been proposed as an alternative means to steam. The effectiveness of the operation is assessed determining the fraction that has survived to the sterilizing agent of a known starting population of micro-organisms. Customarily, this population is introduced into the waste mass in the form of one or more sealed vials. These make up an artificial environment which is completely under control; but onto it the sterilizing agent could a priori behave with higher or lower effectiveness, compared with the loose mass which is directly exposed to it. As far as the traditional steam steril…