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Validation and application of a simple model for circular secondary settling tanksView Crossref metadata(active tab) <div id="edit-xml" class="form-item form-type-item"> <?xml version="1.0"?> <doi_batch version="4.4.1" xmlns="http://www.crossref.org/schema/4.4.1" xmlns:jats="http://www.ncbi.nlm.nih.gov/JATS1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.crossref.org/schema/4.4.1 http://www.crossref.org/schemas/crossref4.4.1.xsd"><head><doi_batch_id>000692</doi_batch_id><timestamp>1713937573</timestamp><depositor><depositor_name>University of the Aegean</depositor_name><email_address>uoa@university.com</email_address></depositor><registrant>Global NEST Journal</registrant></head><body><journal><journal_metadata><full_title>Global NEST Journal</full_title><full_title>Global NEST: the international Journal</full_title><issn media_type="print">1790-7632</issn><issn media_type="electronic">2241-777X</issn></journal_metadata><journal_issue><titles><title>Issue 1</title></titles><publication_date><month>03</month><year>2024</year></publication_date><journal_volume><volume>10</volume></journal_volume><issue>1</issue></journal_issue><journal_article><titles><title>Validation and application of a simple model for circular secondary settling tanks</title></titles><abstract xmlns="http://www.ncbi.nlm.nih.gov/JATS1"><p>A simple model is presented for the dynamic calculation of the sludge blanket height and concentrations of suspended solids (diluted, sludge blanket and return sludge) in circular secondary settling tanks. The model combines a mass balance equation with three empirical equations, which account for the main processes. These equations form a non-linear, dynamic system, which cannot be solved explicitly; thus, a trial-and-error method is adopted. Field data were obtained from a full-scale treatment plant in transient and steady state conditions and were used in the calibration, the verification and the application of the model. Model calibration involved the determination of only two coefficients, which were found to be relatively constant in various operating conditions. Model verification and application were successful showing a satisfactory agreement with field data. A discrepancy of the model to over-predict sludge blanket height during sudden hydraulic overloads was noted and explained.</p></abstract><publication_date><month>04</month><day>29</day><year>2013</year></publication_date><pages><first_page>62</first_page><last_page>72</last_page></pages><publisher_item><identifier id_type="pii">467</identifier></publisher_item><doi_data><doi>10.30955/gnj.000467</doi><timestamp>1713937573</timestamp><resource>https://journal.gnest.org/publication/467</resource></doi_data></journal_article></journal></body></doi_batch> </div>
