1,721,062 research outputs found
Comparison between experimental results of different technologies for arsenic removal from water intended for human consumption
No full textArsenic contamination in drinking water is a major issue in the present world. Techniques such as oxidation, precipitation and adsorption have been widely used for arsenic removal. The goal of this work is to analyze four case studies where the problem of arsenic contamination in groundwater is faced with an approach that includes experimental activities at laboratory scale and/or pilot scale. The first case study investigates the mechanisms for enhancing arsenic removal with naturally occurring Fe by the addition of an oxidizing agent (KMnO4) or a concentrated basic solution of MnO4 and AlO2. In the second case study, different experimental tests are carried out at laboratory scale in order to identify the best combination of treatments to be applied at full scale. The third case study shows the results of experimental studies followed by a full-scale upgrading for a drinking water treatment plant (DWTP) with no specific arsenic treatment in the first configuration. Last, the fourth case study investigates the performance of granular ferric oxide (GFO) with arsenic concentrations close to the Italian regulatory limit. A pilot GFO filter was installed in a DWTP. The monitoring results led to the implementation of the GFO filter at full scale
The reuse of municipal solid waste incineration residues from fluidized bed reactor for concrete products: assessment of mechanical and environmental aspects
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Processi combinati chimici (ossidativi) e biologici (aerobico termofilo e mesofilo) nel trattamento di liquami industriali
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I fluoruri nelle acque ad uso potabile: effetti sulla salute umana e tecnologie di rimozione appropriate – Parte I
No full textTroubleshooting in a full-scale wastewater treatment plant: what can be learnt from tracer tests
No full textThe experimental assessment of the actual reactor hydrodynamic behavior is aimed at detecting possible deviations from the design configuration, as well as suggesting corrective/improving modifications, efficacy of which can be also assessed in the aftermath. The hydrodynamic scheme can be defined by means of tracer tests (stimulus-response method) used for detecting the residence time distribution curve. This study shows the results of three hydrodynamic tests performed on a wastewater treatment plant half-line, in which a biological process (denitrification and oxidation-nitrification) is carried out. Hydrodynamic faults (in terms of dead space and/or flow bypass) were identified, and consequent actions suggested (i.e., change in submerged mixers orientation in the reactors; sinking of the final section of the sludge recirculation pipe below the free surface to avoid foaming phenomena; introduction of new mixed liquor recirculation lines). These actions, together with a careful selection of wastes to be treated, led to an improvement of the overall process performance
Water Safety Plan: an approach to reduce drinking water contamination in a rural area of Senegal
No full textIn 2012, the Italian NGO G. Tovini Foundation, together
with the Universities
of Brescia (Italy) and
Dakar (Senegal), started a cooperation project in
the Rural Community of Patar (Diourbel Region,
Senegal) aimed at improving living conditions of th
e people by implementing the Water Safety Plan
(WSP) approach. After the identification of the main
criticalities and source of pollution, the Water
Safety Plan approach has been developed in order
to minimize/prevent water contamination. The WSP
team was set up involving managers of the dr
inking water supplies, local Authorities and
representatives of the population, w
ho elaborated an appropriate WS
Recupero dei residui da termodistruzione RSU come “aggregato riciclato” per calcestruzzi
No full textImpianto per il trattamento di fanghi biologici con recupero di materie prime seconde ed energia
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