{"id":9421,"date":"2022-08-01T16:31:11","date_gmt":"2022-08-01T14:31:11","guid":{"rendered":"https:\/\/brightwork.nl\/?p=9421"},"modified":"2022-12-07T09:34:43","modified_gmt":"2022-12-07T08:34:43","slug":"head-loss-l-blog-6","status":"publish","type":"post","link":"https:\/\/brightwork.nl\/nl\/continuous-deep-bed-filtration\/head-loss-l-blog-6\/","title":{"rendered":"Hoofdverlies l Blog 6"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"9421\" class=\"elementor elementor-9421\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8edb152 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8edb152\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9e1f0b4\" data-id=\"9e1f0b4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1a83be0 elementor-widget elementor-widget-elementskit-header-info\" data-id=\"1a83be0\" data-element_type=\"widget\" data-widget_type=\"elementskit-header-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<div class=\"ekit-wid-con\" >        <ul class=\"ekit-header-info\">\n                                    <li>\n                            <a > \n                                <i aria-hidden=\"true\" class=\"icon icon-calendar3\"><\/i>                                1 augustus 2022                            <\/a>\n                        <\/li>\n\n                            <\/ul>\n        <\/div>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4dbb045 elementor-widget elementor-widget-page-title\" data-id=\"4dbb045\" data-element_type=\"widget\" data-widget_type=\"page-title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t<div class=\"hfe-page-title hfe-page-title-wrapper elementor-widget-heading\">\n\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/brightwork.nl\/nl\">\n\t\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">\n\t\t\t\t\t\t\t\t\n\t\t\t\tHoofdverlies l Blog 6  \n\t\t\t<\/h1> \n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75afdaf elementor-widget elementor-widget-text-editor\" data-id=\"75afdaf\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p class=\"MsoNormal\" style=\"text-align: justify; tab-stops: 35.45pt 49.65pt;\"><span lang=\"EN-US\">In een continu zandfilter passeert het water het filterbed in opwaartse richting. De stroming van water door een poreus medium resulteert in een hydraulische drukval. Deze drukval noemen we de filterbedweerstand. De werkelijke waarde van deze filterbedweerstand wordt gemeten door het verschil in opvoerhoogte in de toevoerleiding naar het filter en het filtraatniveau in het filter af te lezen, zoals aangegeven in de figuur. Hetzij met behulp van een drukmeter, hetzij door eenvoudigweg het waterniveau in de ontluchtingsleiding boven in het filter te meten.<\/span><\/p>\n<h3>&nbsp;<\/h3>\n<h3><span style=\"color: #000000;\"><strong>Weerstand van het filterbed<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">De weerstand van het filterbed, H<sub>filterbed<\/sub>kan worden onderverdeeld in twee componenten:<\/span><\/p>\n<p><span style=\"color: #000000;\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; H<sub>filterbed<\/sub> = H<sub>0<\/sub> + H<sub>depositie&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/sub>(1)<\/span><\/p>\n<p><span style=\"color: #000000;\">H<sub>0<\/sub> wordt aangeduid als de <em>weerstand tegen schoon bed<\/em>; dit is de hydraulische weerstand ten gevolge van de waterstroming van een schoon filterbed, zonder afzettingen in de pori\u00ebnruimte.<\/span><\/p>\n<p><span style=\"color: #000000;\">De tweede component, H<sub>depositie<\/sub>staat voor de extra filterbedweerstand ten gevolge van afzettingen in de pori\u00ebnruimte van het filtermedium.<\/span><\/p>\n<p class=\"MsoNormal\" style=\"text-align: justify; tab-stops: 35.45pt 49.65pt;\"><span lang=\"EN-US\">In blog #5 hebben we laten zien hoe de schoonbedweerstand wordt berekend. In deze blog gaan we de relevantie beschrijven van de tweede component H<\/span><sub><span lang=\"EN-US\" style=\"font-size: 12.0pt; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 'MS Mincho'; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\">depositie<\/span><\/sub><span lang=\"EN-US\" style=\"font-size: 12.0pt; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 'MS Mincho'; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\"> in de vergelijking van de filterbedweerstand op de filterprestaties.<\/span><\/p>\n<p><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7390ef4 elementor-widget elementor-widget-text-editor\" data-id=\"7390ef4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<b>Drukverlies door afzetting van vaste stoffen in het filterbed<\/b>\n<p class=\"p1\">In het water aanwezige onzuiverheden worden in de pori\u00ebn van het filterbed afgezet. Door deze afzettingen worden de pori\u00ebn nauwer, wat leidt tot extra weerstand van het filterbed.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">Een belangrijke factor die van invloed is op de filtratie-effici\u00ebntie is de vullingsgraad van de pori\u00ebn. Een hogere vullingsgraad van de pori\u00ebn in het filterbed vormt een extra barri\u00e8re voor vaste stoffen die het filter binnenkomen. Dit leidt in het algemeen tot een betere filtraatkwaliteit. Ook bekend als \"<i>vuilvangend vuil<\/i>\".<\/p>\n<p class=\"p1\">Om de filtereffici\u00ebntie te verbeteren is dus een bepaalde hoeveelheid afzettingen nodig, die kan worden bereikt door de zandcirculatiesnelheid te verlagen. Hoe lager de toegepaste zandcirculatiesnelheid, hoe hoger de hoeveelheid afzettingen, hoe hoger het extra verlies aan filterbedhoogte, hoe hoger de filtereffici\u00ebntie.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\">Dit geldt totdat het maximaal toepasbare drukverlies is bereikt. Zoals aangegeven in een van onze eerdere blogs is dit maximale drukverlies gedefinieerd als 2\/3 maal de bedhoogte.<\/p>\n<p class=\"p1\">Het wijzigen van de zandcirculatie bij continue filtratie gebeurt door het aanpassen van de luchtstroom naar de luchtlift. De zandcyclusbewaking en -regeling van continue filters is ontwikkeld om juist deze gunstige omstandigheden te verkrijgen. Zandcirculatiesnelheden waarmee het filtersysteem binnen een drukverliesbereik kan werken om aan de beste prestatievoorwaarden te voldoen. <span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p class=\"p1\"><b>Illustratie van veldgegevens<\/b><\/p>\n<p class=\"p1\">In een continu filter zal het merendeel van de depositie zich aan de aanvoerzijde van het filterbed bevinden,<span class=\"Apple-converted-space\">\u00a0 <\/span>net boven het distributiesysteem van de filtervoeding. Dit wordt ge\u00efllustreerd in figuur 1, waarin het XY-diagram van het stijghoogteverlies en<span class=\"Apple-converted-space\">\u00a0 <\/span>hoogte van het filterbed. Het filter (met een bedhoogte van 1,8 m)<span class=\"Apple-converted-space\">\u00a0 <\/span>werkt met een filtratiesnelheid van 14 m\/h bij een watertemperatuur van 10 graden C. De toegepaste zandkorrelgrootteverdeling is 0,8 - 1,25 mm. Het zuivere bedhoogteverlies bedraagt 0,40 meter per meter bedhoogte.<\/p>\n<p class=\"p1\">Twee verschillende procesomstandigheden worden ge\u00efllustreerd: de blauwe lijn vertegenwoordigt een hoge zandcirculatiesnelheid (12 mm\/min), geen afzetting en dus alleen hydraulisch drukverlies. De rode lijn toont een lage zandcirculatiesnelheid (2 mm\/min), met als gevolg de opbouw van afzettingen in het onderste filterbed, waardoor extra drukverlies door afzettingen ontstaat.<\/p>\n<p class=\"p1\">Een vergelijking van het verschil in filterprestatie voor troebelheidsverwijdering voor deze twee bedrijfsomstandigheden geeft de relevantie aan: de gemiddelde prestatie neemt toe met 15 - 40%. Indien het continue filter bovendien als biofilter wordt gebruikt (b.v. voor stikstofverwijdering) draagt deze optimalisatie ertoe bij dat meer biomassa in het filter wordt vastgehouden, waardoor de biologische omzetting wordt bevorderd.<\/p>\n<p class=\"p1\"><b>Samenvatting<\/b><\/p>\n<p class=\"p1\">Opvoerhoogteverlies is een belangrijke procesparameter bij continue filtratie. Het bestaat uit twee componenten: het hydraulische drukverlies en het drukverlies door afzettingen in het filterbed. De aard van het continue filtratieproces maakt het mogelijk om het drukverlies door afzettingen in het filterbed actief te regelen. De luchttoevoer naar de luchtlift regelt dit drukverlies actief. Dit zal over het algemeen leiden tot hogere filterprestaties.<br><span class=\"Apple-converted-space\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-9441 size-full\" src=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/08\/blog-6.png\" alt=\"\" width=\"394\" height=\"238\" srcset=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/08\/blog-6.png 394w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/08\/blog-6-300x181.png 300w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/08\/blog-6-18x12.png 18w\" sizes=\"(max-width: 394px) 100vw, 394px\" \/><\/span><\/p>\n<p class=\"p1\"><i><small>Figuur 1 - Opvoerhoogte versus bedhoogte voor twee procesomstandigheden met verschillende zandcirculatiesnelheden in een continu zandfilter<span class=\"Apple-converted-space\">\u00a0<\/span><\/small><\/i><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In een continu zandfilter passeert het water het filterbed in opwaartse richting. De stroming van water door een poreus medium resulteert in een hydraulische drukval. Deze drukval noemen we de filterbedweerstand.<\/p>","protected":false},"author":2,"featured_media":9381,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[40],"tags":[],"class_list":["post-9421","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-continuous-deep-bed-filtration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Head loss  l Blog 6 - Brightwork BV<\/title>\n<meta name=\"description\" content=\"In a continuous sand filter the water passes the filter bed in upward direction. The flow of water through a porous medium results in a hydraulic pressure drop. 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