{"id":8104,"date":"2022-04-08T10:36:33","date_gmt":"2022-04-08T08:36:33","guid":{"rendered":"https:\/\/brightwork.nl\/?p=8104"},"modified":"2022-05-30T11:37:01","modified_gmt":"2022-05-30T09:37:01","slug":"filter-material-in-continuous-filters-l-blog-3","status":"publish","type":"post","link":"https:\/\/brightwork.nl\/nl\/continuous-deep-bed-filtration\/filter-material-in-continuous-filters-l-blog-3\/","title":{"rendered":"Filtermateriaal in continufilters l Blog 3"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"8104\" class=\"elementor elementor-8104\">\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\" data-e-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\" data-e-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-e-type=\"widget\" data-widget_type=\"elementskit-header-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\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>                                8 April 2022                            <\/a>\n                        <\/li>\n\n                            <\/ul>\n        <\/div>\t\t\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-e-type=\"widget\" data-widget_type=\"page-title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\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\tFilter material in continuous filters  l Blog 3  \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\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be38f4d elementor-widget elementor-widget-heading\" data-id=\"be38f4d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><b><font color=\"#000000\"><span style=\"font-size: 23px;white-space: normal\">Physical data<\/span><\/font><\/b><\/h3>\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-e-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\t\t<p class=\"MsoNormal\">Filter sand is the most common filter media used in deep bed filtration systems. The reason is that it is the perfect filter media: inert, resistant to abrasion, free of impurities, available in a uniform grain-size distribution and relatively cheap.<\/p><p class=\"MsoNormal\" style=\"mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; text-autospace: none; vertical-align: baseline;\"><span lang=\"EN-US\">Filter sand used in deep bed filters, such as continuous filters, may be abstracted from two sources: either from river beds or by mining. In continuous filters the river bed quartz sand is preferred as it is perfectly rounded due to the long-term natural erosion process. As the sand is continuously moving downwards in a continuous filter the rounded sand promotes homogeneous movement. This results in better filter performances. \u00a0The river sand is dredged from the river basin and should be processed before it can be used for deep bed filtration. Processing consists of cleaning, drying and sieving of the raw material, in order to produce a product which is in accordance with a number of quality criteria.<\/span><\/p><p class=\"MsoNormal\" style=\"mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; text-autospace: none; vertical-align: baseline;\"><span lang=\"EN-US\">The specific density of filter sand is 2.6 ton\/m<sup>3<\/sup>, with a pore space or porosity of 40%. This is irrespective of the shape and grain size. This means that the apparent density of the filter media in a sand filter is equal to 1.6 ton\/m<sup>3<\/sup>.<\/span><\/p><p class=\"MsoNormal\" style=\"mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; text-autospace: none; vertical-align: baseline;\"><span lang=\"EN-US\">An important characteristic of filter sand is its hardness. The harder the material the better it will keep its shape in long-term filtration operations. The Mohs scale of mineral hardness is used to determine the filter media hardness. It is expressed in a qualitative ordinal scale from 1 to 10, characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material.<\/span><\/p><p class=\"MsoNormal\" style=\"mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; text-autospace: none; vertical-align: baseline;\"><span lang=\"EN-US\">Dutch river sand typically consists of 96% SiO<sub>2<\/sub> and 2% <\/span>Al<sub>2<\/sub>O<sub>3<\/sub> and the loss of ignition should be low: &lt; <span lang=\"EN-US\">0.5%. The sand<\/span> is<span lang=\"EN-US\"> characterized by 7 on the Mohs hardness scale. To put this into perspective: gypsum is 2 Mohs, while diamond is 10 Mohs, the hardest material.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2737624 elementor-widget elementor-widget-image\" data-id=\"2737624\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"258\" height=\"195\" src=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture1.png\" class=\"attachment-large size-large wp-image-8107\" alt=\"\" srcset=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture1.png 258w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture1-16x12.png 16w\" sizes=\"(max-width: 258px) 100vw, 258px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-820c8d0 elementor-widget elementor-widget-text-editor\" data-id=\"820c8d0\" data-element_type=\"widget\" data-e-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\t\t<p><span style=\"color: #7a7a7a; font-size: 17px; text-align: justify;\"><i>Figure 1. A rounded river sand grain used for filtration<\/i><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-91cfc3f elementor-widget elementor-widget-heading\" data-id=\"91cfc3f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Filter sand size and distribution<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-075e460 elementor-widget elementor-widget-text-editor\" data-id=\"075e460\" data-element_type=\"widget\" data-e-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\t\t<p>In a sand filter the grain size distribution is determined based on the application and the solids loadings. In drinking water applications grain sizes of 0.6 \u2013 1.3 mm is typically used, while in waste water applications 1.2 \u2013 2.0 mm is common.<\/p><p class=\"MsoNormal\"><span lang=\"EN-US\">If sand is supplied in a guaranteed grain size range then the upper and lower grain size limit is not rock solid. Ordering a grain size range of 1.2 \u2013 2.0 mm, both the lower and upper limit allows for 10 weight% smaller and 10 weight% bigger grains.\u00a0<br \/><\/span><\/p><p class=\"MsoNormal\"><span lang=\"EN-US\">Another important parameter, characterizing the filter sand, is the uniformity coefficient or UC. This is defined as a ratio and is calculated as the size opening that will just pass 60% of the sand (d60<br \/>\u00a0value) divided by the size opening that will just pass 10% of the sand sample (d10 value). If the uniformity coefficient is below 1.5, it means that the sand particles are very similar in size. <\/span><\/p><p class=\"MsoNormal\">For deep bed filtration the value of the uniformity coefficient should be between 1.3 and 1.5 to avoid stratification of the filter bed during backwashing. A lower value of the coefficient is possible, but this results in higher sieving costs and provides little additional advantage. In a continuous sand filter this stratification issue is not relevant as the sand washing procedure is quite different and the media is not expanded.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74c43af elementor-widget elementor-widget-heading\" data-id=\"74c43af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><p><b>Filter sand in a continuous filter<br><\/b><\/p>\n\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b948517 elementor-widget elementor-widget-text-editor\" data-id=\"b948517\" data-element_type=\"widget\" data-e-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\t\t<p>Once the filter tank is filled with sand (either using big bags or by bulk carrier, blowing in the sand) and the filter is operational, the sand bed looks like the cross section indicated. In the center of the filter the vertical airlift, at the top the washer assembly and at the lower side of the tank the distributor arms, feeding the filter. Then washed sand falls back onto the top of the sand bed in an angle of 30 degrees, equal to the natural slope. The effective sand bed height is the distance between the bottom of the feed distributor arms and the top of the sand bed, measured at the edge of the filter tank.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-22c96d2 elementor-widget elementor-widget-image\" data-id=\"22c96d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"222\" height=\"300\" src=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture2-222x300.png\" class=\"attachment-medium size-medium wp-image-8108\" alt=\"\" srcset=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture2-222x300.png 222w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture2-9x12.png 9w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/04\/zand-Picture2.png 289w\" sizes=\"(max-width: 222px) 100vw, 222px\" \/>\t\t\t\t\t\t\t\t\t\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-28b0b41 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"28b0b41\" data-element_type=\"section\" data-e-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-0509fd2\" data-id=\"0509fd2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-af3508b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"af3508b\" data-element_type=\"section\" data-e-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-a5f434b\" data-id=\"a5f434b\" data-element_type=\"column\" data-e-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-8668d28 elementor-widget elementor-widget-text-editor\" data-id=\"8668d28\" data-element_type=\"widget\" data-e-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\t\t<p style=\"text-align: center;\" align=\"center\"><i><a>Figure\u00a0<\/a>2. Sandbed height<\/i><\/p><div><p><!-- [if !supportAnnotations]--><\/p><div><div><p><!-- [if !supportAnnotations]--><\/p><\/div><p><!--[endif]--><\/p><\/div><\/div>\t\t\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>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Filterzand is het meest gebruikte filtermedium in diepbedfiltratiesystemen. De reden daarvoor is dat het het perfecte filtermedium is: inert, slijtvast, vrij van verontreinigingen, beschikbaar in een uniforme korrelgrootteverdeling en relatief goedkoop.<\/p>","protected":false},"author":2,"featured_media":8142,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_canvas","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[40],"tags":[],"class_list":["post-8104","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 v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Filter material in continuous filters l Blog 3 - Brightwork BV<\/title>\n<meta name=\"description\" content=\"Filter sand used in deep bed filters, such as continuous filters, may be abstracted from two sources: either from river beds or by mining. 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