Search results for " clogging"

showing 4 items of 4 documents

Evaluation of clogging in full-scale subsurface flow constructed wetlands

2016

Abstract Treatment processes that occur in constructed wetlands can result in gradual clogging of the porous medium. Clogging may result in hydraulic malfunction and/or reduced treatment performance. The aim of this study was to analyze the hydraulic aspects of horizontal subsurface flow (H-SSF) constructed wetlands (CWs), and, in particular, to investigate the clogging phenomena through in situ measurements of hydraulic conductivity of the gravel bed, quantification of accumulated clog matter and flow paths visualization by means of tracer tests. Removal efficiencies of chemical and physical contaminants were also assessed. Experiments were carried out in three full-scale H-SSF CWs in Sici…

Environmental EngineeringCloggingHydraulic conductivity0208 environmental biotechnologyWetland02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and Law01 natural sciencesConstructed wetlands Clogging Hydraulic conductivity Tracer testCloggingHydraulic conductivityTRACERSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliSubsurface flowEffluent0105 earth and related environmental sciencesNature and Landscape Conservationgeographygeography.geographical_feature_categoryConstructed wetlandsEnvironmental engineeringConstructed wetland020801 environmental engineeringConstructed wetlands; Clogging; Hydraulic conductivity; Tracer testTracer testEnvironmental scienceSewage treatmentPorous mediumEcological Engineering
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Fate of aerobic granular sludge in the long-term: The role of EPSs on the clogging of granular sludge porosity

2016

This work aims to investigate the stability of aerobic granular sludge in the long term, focusing on the clogging of the granular sludge porosity exerted by the extracellular polymeric substances (EPSs). The effects of different cycle lengths (short and long-term cycle) on the granular sludge stability were investigated. Results obtained outlined that during the short duration cycle, the formation and breakage of the aerobic granules were continuously observed. During this period, the excess of EPS production contributed to the clogging of the granules porosity, causing their breakage in the long run. During the long-duration cycle, the extended famine period entailed a greater EPSs consump…

Porosity cloggingEnvironmental EngineeringPolymers0208 environmental biotechnology02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and Law01 natural sciencesWater PurificationCloggingBioreactorsExtracellular polymeric substanceBreakageExtracellular polymeric substances (EPSs)BiomassLong-term stabilityPorosityWaste Management and DisposalShort durationAerobic granular sludge; Extracellular polymeric substances (EPSs); Feast/famine; Long-term stability; Porosity clogging; Environmental Engineering; Waste Management and Disposal; Management Monitoring Policy and Law0105 earth and related environmental sciencesBacteriaSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleChemistryEnvironmental engineeringGeneral MedicineLimitingPulp and paper industryAerobiosis020801 environmental engineeringFeast/famineAerobic granular sludgePorosity
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Mix-design del calcestruzzo permeabile per la realizzazione di trincee drenanti profonde

2017

La riduzione delle pressioni interstiziali rappresenta uno degli interventi più efficaci per migliorare le condizioni di stabilità di pendii con ridotti margini di sicurezza o per stabilizzare pendii in frana. Per tali finalità si possono impiegare le trincee drenanti, realizzate con comuni escavatori e riempite di materiale grossolano. Questa tipologia costruttiva non può essere impiegata se le trincee sono profonde. In questo caso occorre ricorrere a mezzi di scavo disponibili per la realizzazione dei diaframmi e dei pali secanti. Tuttavia, il materiale di riempimento delle trincee non può essere costituito di materiali sciolti, ossia materiali non cementati, dal momento che lo scavo di u…

Settore ICAR/07 - GeotecnicaMix-design conduttività idraulica resistenza al clogging
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Sistema di irrigazione a perno centrale

2021

L’invenzione consiste nell’impiego, nell’irrigazione pivot, dei comuni irrigatori rotanti che si utilizzano nei sistemi di irrigazione a pioggia (o per aspersione), che hanno il vantaggio, rispetto agli spruzzatori ed ai gocciolatori, di essere dotati di un ugello terminale di elevato diametro (4-30 mm). L’idea nasce quindi dalla ricerca di un sistema irriguo che conservi i benefici dell’irrigazione pivot (completa automatizzazione, manodopera limitata alla manutenzione degli apparecchi erogatori, elevata efficienza) e che al contempo rimuova del tutto il problema dell’occlusione degli apparecchi erogatori. Vengono così azzerati i costi di manodopera e, soprattutto, viene consentito l’impie…

center pivot irrigation sprinkler-gun irrigation clogging energy saving efficiencySettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali
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