1,721,157 research outputs found
Ottimizzazione del recupero biologico di terreni contaminati da gasolio mediante l’addizione di substrati organici di poco pregio
No full textThe paper presents the results of a research programme on recovery of sites contaminated by diesel fuel. A considerable enhancement of the pollutant biodegradation can be achieved by means of the addition of low value organic substrates to the soil
Applicazione dell’elettrocinesi per la rimozione e contenimento di metalli pesanti da suoli contaminati
No full text
Bonifica di mezzi porosi contaminati da metalli pesanti mediante elettrocinesi. Applicazione al trattamento di sedimenti marini
No full textDynamic transformations of nitrogen during mechanical-biological pre-treatment of municipal solid waste
No full textMechanical–biological pre-treatment (MBP) of municipal solid waste (MSW) has gained evidence as a practice capable of accomplishing
the requirements for environmental sustainable landfilling. In particular, MBP is effective in reducing the ammoniacal nitrogen
content in the leachate. However, few data are available on the modifications of the nitrogen forms occurring during MBP and on the
role played by processes such as nitrification and generation of refractory organic compounds. The dynamic transformations of nitrogen
were investigated during the MBP. MSW was mechanically and biologically pre-treated; samples were collected at different stages of the
process and analysed to investigate the evolution of nitrogen forms; batch and column leaching tests were performed as well. The results
indicate that nitrification is negligible and volatilization can only partially explain the low ammoniacal nitrogen content in the leachate.
Incorporation of ammoniacal nitrogen into a refractory organic form was assessed and is likely to play an important role. The maximum
content of refractory organic nitrogen in the solid waste was achieved after about 60 days of aerobic pre-treatment; therefore, the minimal
duration of the MBP should be about 8–9 weeks in order to optimize the ammoniacal nitrogen incorporation, unless the waste is
characterized by a low C/N ratio
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