1,721,052 research outputs found
Evaluation of the contamination level of an abandoned industrial site
No full textA method for the evaluation of the contamination level of an abandoned industrial site and the application of the method to a chemical plant are presented. The method consists of an initial application of a limit concentration list, that certifies the contamination. Ascertained of the need to intervene, an absolute risk analysis is used to appraise the real contamination of the site and the reclamation objective. During this phase, it is often important to use specific mathematical models that, simulating the real behavior of contaminants in the ground, give all the useful information to elaborate a correct program of intervention
Effects of leachate salinity on the aerobic and anaerobic mineralization of the municipal Solid waste
No full text
Going 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
Biological treatment of tannery wastewater in the presence of chromium
No full textExperiments were carried out to determine the feasibility of treating tannery wastewater containing chromium, an inhibiting compound, with sequencing batch reactors (SBR).
The maximum chromium concentration tolerated by microorganisms was determined through aerobic and anoxic batch experiments, and
the biomass inhibition process was analyzed in a lab scale reactor at increasing chromium concentrations.
The results obtained, in batch experiments and in the SBR reactor, have demonstrated that chromium addition had less influence on the denitrification bacteria than on the nitrification bacteria. In addition, it was observed that nitrification and denitrification rates, at the same chromium concentration, were higher in the SBR reactor than in batch experiments with unacclimated biomass. Experimental results confirm that sequencing batch reactors are able to produce a more resistant biomass, which acclimates quickly to inhibiting conditions. A large
amount of chromium was found in the sludge from the reactor, while the effluent was devoid of the inhibiting metal
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