1,721,462 research outputs found
Alternate cycles process for municipal wwtp upgrading: ready for widespread application?
No full textThe interest in the biological alternating anoxic/oxic reactors to upgrade existing wastewater treatment plants
has been recently renewed, thanks to the use of reliable automatic control systems. To discuss the treatment
capabilities of the alternating systems, with particular relation to the municipal WWTPs’ upgrading, this
study exploits the experience gained in this field through numerous years of R&D. At first a pilot plant study
and then a full scale alternating plant were used to supply experimental data that support the final schematic
of methodology. The pilot experimentation was based in the real loading conditions of the italian municipal
WWTPs. Real municipal sewage was used to feed the plant in six steady-state periods, applying nitrogen
loading rates ranging from 0.03 to 0.1 kg N m-3 d-1. Major problems with the nitrogen removal performances
occurred in the case of overaeration of the activated sludge tank, corresponding to influent low-loaded
wastewater. The experimental durations per day of the anoxic and oxic phases were in good agreement with
a simplified mathematical model, which was validated by full scale data and was finally considered useful for
the upgrading design. The maximum treatment capacity of the process in terms of nitrogen loading rates was
estimated in the range 0.10-0.16 kg N m-3 d-1 according to the different rates for biological nitrification
and denitrification, which influence the oxic and anoxic durations per day. Moreover, the reliability of the
control device used for the experimentation was proved through the statistic analyses of the performed cycles,
which were in agreement with the actual nitrogen removal performances. Finally, the schematic of methodology
shows how easy and consolidated the upgrading of existing wastewater treatment plants by the alternate
cycles process could be
Comparazione MBR e trattamenti terziari per la rimozione ad alta efficienza di microinquinanti prioritari
No full textAlternate Cycles Process for Municipal WWTPs Upgrading: Ready for Widespread Application?
No full text
Sludge line automation in real waste water treatment plants. experimentation and optimization of control logic
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Los suelos y la agricultura en los municipios de San Antonio de Los Ba��os, La Salud y Quivic��n
No full textComparazione MBR e trattamenti terziari per la rimozione ad alta efficienza di microinquinanti prioritari
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