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Papers by Roberto Canziani

Ingegneria dell'Ambiente, Jun 30, 2015

DESALINATION AND WATER TREATMENT, 2017

Water Science and Technology, Nov 11, 2013

IWA Publishing eBooks, Jan 15, 2023

Bioresource Technology, 2015

Biochemical Engineering Journal, Oct 1, 2010

Biological modeling of wastewater processes has gained importance for their design, control and o... more Biological modeling of wastewater processes has gained importance for their design, control and operation. However, this requires consistent information on the biological activity. Microcalorimetry has also been developed to investigate biological processes and measure bacterial metabolisms. This measurement is done on the basis of the heat (produced or consumed) and therefore has a wider range of applicability compared to other methods based on the chemical analyses of substrate consumption or product formation. For this purpose, a 2 L Bio-RC1 (Mettler-Toledo) has been modified to reach a resolution of 5-10 mW L −1 and applied to research projects on activated sludge characterization. Several calorimetric applications are presented regarding studies of biomass activity (useful to achieve kinetic and stoichiometric coefficients) and pollutants degradation in aerobic, anoxic and anaerobic conditions.

$Research paper thumbnail of Nitrification denitrification via nitrite in a pilot-scale SBR treating the liquid fraction of co-digested piggery/poultry manure and agro-wastes$

Chemical Engineering Journal, Jul 1, 2013

A lab-scale sequencing batch reactor (SBR) was employed to treat low C/N ratio municipal wastewat... more A lab-scale sequencing batch reactor (SBR) was employed to treat low C/N ratio municipal wastewater to investigate the stability of nitrification-denitrification via nitrite using a real-time control strategy to switch aeration on and off. Three parameters, pH, DO and ORP, were selected as control parameters in the SBR reactor operation. Nitrite accumulation was observed under real-time control conditions (NO 2 −-N/NO x −-N > 0.8), implying that nitrification-denitrification mainly via nitrite was achieved by the process control strategy applied. The nitrite concentration in the SBR decreased sharply when the SBR system was operated using a fixed time aeration control strategy for 7 days. Ammonia nitrogen concentration (NH 4 +-N) and temperature also affect nitrite accumulation. Ammonia shock loads limited nitrification due to alkalinity limitations, but the system recovered quickly from short-time high ammonia shock loads when the real-time control strategy was applied. Temperature was observed to affect nitrite accumulation rate when the real-time control strategy was used in the SBR reactor, with higher nitrite accumulation at 28 ± 0.5 • C (NO 2 −-N/NO x −-N = 0.84), compared to the accumulation at the ambient average temperature of 20 • C (NO 2 −-N/NO x −-N > 0.61).

Journal of Cleaner Production, Mar 1, 2008

Proceedings of the Water Environment Federation, 2007

Biotechnology and Bioengineering, 2007

An improved pH-stat titrimetric procedure was developed, validated, and extensively applied to mo... more An improved pH-stat titrimetric procedure was developed, validated, and extensively applied to monitor biological heterotrophic denitrification in a lab-scale sequencing batch reactor (SBR). So far, titrimetric procedures were not successful in monitoring denitrification processes in full-scale wastewater (WW) treatment plants, mainly because the stoichiometric ratio between proton production and nitrate reduction is highly variable due to variability of both biomass and influent WW characteristics. In this article, a new titration procedure is proposed where a simple calibration step is performed before each experimental test. This procedure allows for the assessment of (i) nitrate content in a sample of mixed liquor; (ii) the maximum denitrification rate of sludge when fed on acetate; and (iii) the denitrification potential (DNP) of different substrates. As for (i), validation by comparison with spectrophotometric measures indicated an average discrepancy of less than 3% on more than 40 samples; as for (ii) and (iii) collected values compared well with literature data. The titrimetric method proposed here is also capable of assessing the biomass anoxic yield in a very simple way, since it does not require any analytical nitrate determination. According to the results of this experimentation, titrimetry appeared to be a simple, inexpensive, and powerful tool for monitoring and operating denitrification processes in WW treatment plants.

Inquinamento, 2003

... PEROTTO Eleonora ; CANZIANI Roberto ; MARCHESI Renzo ; Revue / Journal Title. Inquinamento IS... more ... PEROTTO Eleonora ; CANZIANI Roberto ; MARCHESI Renzo ; Revue / Journal Title. Inquinamento ISSN 0001-4982 Source / Source. 2003, vol. 45, n o 50, pp. 48-57 [10 page(s) (article)] Langue / Language. Italien Editeur / Publisher. Jackson, Milano, ITALIE (1976) (Revue) ...

Inquinamento, 2006

In Italy, management of Water Services needs optimisation and inefficient operation should be red... more In Italy, management of Water Services needs optimisation and inefficient operation should be reduced as much as possible for many reasons. First of all, an optimised management would improve water quality; secondly it would reduce operational costs, which are paid by the users; and, finally, it would improve the competitiveness of the Water Companies. The new regulation on environment (Decree 152, issued in April 2006) confirmed the Water Service System in Italy as it was first established by the so-called "Galli" law (issued in 1994). It states that efficacy technical efficiency and cost-effectiveness should be the criteria for Water Service management. Today an efficient management is necessary as increasing water consumption, especially for water consuming activities such as agriculture, may lead to water shortage and competition for the access to water resources. These, in turn, have to be carefully safeguarded against pollution. Since stricter limits have been imposed by recently approved regulations, it is crucial to achieve these new goals at the lower possible cost and at the 'best possible level. Therefore, it is very important to measure the management and environmental performance of Water Services and to make comparison among similar areas. Indicators and indices are one of the best option to achieve a simple, understandable and efficient picture of the technical, economical and environmental performance of Water Services.