{"id":7800,"date":"2022-03-17T11:38:41","date_gmt":"2022-03-17T10:38:41","guid":{"rendered":"https:\/\/brightwork.nl\/?p=7800"},"modified":"2022-05-30T11:38:04","modified_gmt":"2022-05-30T09:38:04","slug":"understanding-the-washing-principle-in-continuous-filters-l-blog-2","status":"publish","type":"post","link":"https:\/\/brightwork.nl\/de\/continuous-deep-bed-filtration\/understanding-the-washing-principle-in-continuous-filters-l-blog-2\/","title":{"rendered":"Das Waschprinzip in kontinuierlichen Filtern verstehen l Blog 2"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"7800\" class=\"elementor elementor-7800\">\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-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\/de\">\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\tUnderstanding the washing principle in continuous filters  l Blog 2  \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-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>                                18 March 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-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 style=\"text-align: justify;\"><span lang=\"EN-US\">In a continuous filter, the filtration process takes place simultaneously with the washing of the filter media. The washing process consists of two principles: the highly turbulent airlift transport of dirty sand from the bottom of the filter to the top of the filter and the final separation of sand grains and solids. <\/span>In this blog we will highlight the washing process and characteristics.<\/p><p>\u00a0<\/p><p style=\"text-align: justify;\"><span lang=\"EN-US\">The air lift transports a mixture of sand and impurities of the bottom of the filter to the washer, which is located in the center of a filter, in the filtrate area. See figure 1. The main function of the washer is to separate clean sand grains from impurities.<\/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=\"450\" height=\"340\" src=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test-450x340.png\" class=\"attachment-large size-large wp-image-7873\" alt=\"rapid sand filter\" srcset=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test-450x340.png 450w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test-300x226.png 300w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test-768x580.png 768w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test-16x12.png 16w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/test.png 1060w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/>\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;\">Figure 1. The main function of the washer is to\u00a0<\/span><span style=\"color: #7a7a7a; font-size: 17px; text-align: justify;\">separate clean sand grains from impurities<\/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-f079958 elementor-widget elementor-widget-heading\" data-id=\"f079958\" 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 class=\"MsoBodyText3\" style=\"text-align:justify\"><b><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">Airlift\ntransport<\/span><\/b><\/p>\n\n<p class=\"MsoBodyText3\" style=\"text-align:justify\"><\/p><\/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 class=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">Sand and solids are sucked into the airlift at the bottom part of the filter due to the feed of compressed air into the airlift. This principle is well known in dredging and very effective for vertical transport of sand. During the vertical transport of the mixture of sand, solids, air and water the sand grains are effectively washed by the air and water scour, prior to discharge into the washer assembly at the top of the filter.<\/span><\/p><p class=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: Calibri, sans-serif;\">The typical amount of air required for the airlift transport and scouring is 1.0 \u2013 1.5 Nm<\/span><sup style=\"font-family: Calibri, sans-serif;\">3<\/sup><span style=\"font-family: Calibri, sans-serif;\"> of air per ton of filter sand lifted. The typical amount of water lifted together with the sand\/solids mixture is 0.3 \u2013 0.5 m<\/span><sup style=\"font-family: Calibri, sans-serif;\">3<\/sup><span style=\"font-family: Calibri, sans-serif;\"> per ton of sand lifted.\u00a0<\/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-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 class=\"MsoBodyText3\" style=\"text-align:justify\">\n\n<\/p><p class=\"MsoBodyText3\" style=\"text-align:justify\"><b><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">Washer\nassembly &nbsp;<\/span><\/b><\/p><p class=\"MsoBodyText3\" style=\"text-align:justify\">\n\n<b><span style=\"font-family:&quot;Calibri&quot;,sans-serif\"><\/span><\/b><\/p><\/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 class=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">The cross section of the washer assembly<br \/>is indicated in figure 2. The core part of the washer is the labyrinth, which separates the clean sand grains from the solids. The separation mechanism is based upon the density difference between the (heavy) sand grains and the light solids. Filtrate water flows upward through the washer labyrinth, forced hydraulically by a pre-set water level difference between wash water and filtrate. This level difference can be manually set between 5-10 cm.\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">The main function of the washer is to separate sand\u00a0<\/span><span lang=\"EN-US\" style=\"font-family: Calibri, sans-serif;\">grains from solids.\u00a0<\/span><\/p><p class=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: Calibri, sans-serif;\">How to arrange\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">this? Simply by creating an upward high enough flow velocity of water through\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">the washer labyrinth to wash out solids without losing sand grains. The design water\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">velocity through the washer is the key to this all. Let\u2019s illustrate this with\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">some calculations. Assume the smallest<\/span><span style=\"font-family: Calibri, sans-serif;\"> sized sand grain is 0.5 mm. Such a grain\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">has a settling velocity of about 500 m\/h. Solids retained in the filter normally\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">settle at a rate less than 5 m\/h. Hence the washer is designed to create up\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">flow velocities of 50 \u2013 100 m\/h. High enough to wash out solids, without\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">washing out sand grains.<\/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\"><p class=\"MsoBodyText3\" style=\"text-align:justify\"><b><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">Total wash\nwater flows<\/span><\/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-f11a013 elementor-widget elementor-widget-text-editor\" data-id=\"f11a013\" 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=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">As explained the total wash water flow in a continuous filter is the sum of:<\/span><\/p><p class=\"MsoBodyText3\" style=\"margin-left: 36.0pt; text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;\"><!-- [if !supportLists]--><span style=\"font-family: 'Calibri',sans-serif; mso-fareast-font-family: Calibri; mso-ansi-language: EN-GB;\">&#8211;<span style=\"font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><!--[endif]--><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">The water which is lifted with the grains\/solids in the airlift (also indicated as the \u201cpump water\u201d).<\/span><\/p><p class=\"MsoBodyText3\" style=\"margin-left: 36.0pt; text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;\"><!-- [if !supportLists]--><span style=\"font-family: 'Calibri',sans-serif; mso-fareast-font-family: Calibri; mso-ansi-language: EN-GB;\">&#8211;<span style=\"font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/span><!--[endif]--><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">The filtrate water used to wash out the solids in the washer labyrinth.<\/span><\/p><p class=\"MsoBodyText3\" style=\"text-align: justify;\"><span style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-GB;\">\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">As a rule of thumb you should have a total wash water flow which is in the range of 0.8 \u2013 1.0 m<\/span><sup style=\"font-family: Calibri, sans-serif;\">3<\/sup><span style=\"font-family: Calibri, sans-serif;\">\/h per m<\/span><sup style=\"font-family: Calibri, sans-serif;\">2<\/sup><span style=\"font-family: Calibri, sans-serif;\"> of filter area in a standard continuous sand filter plant. Hence a 5 m<\/span><sup style=\"font-family: Calibri, sans-serif;\">2<\/sup><span style=\"font-family: Calibri, sans-serif;\"> continuous filter is generating a continuous wash water flow which is in the range of 4.0 \u2013 5.0 m<\/span><sup style=\"font-family: Calibri, sans-serif;\">3<\/sup><span style=\"font-family: Calibri, sans-serif;\">\/h.\u00a0<\/span><span style=\"font-family: Calibri, sans-serif;\">Be aware this total wash water flow is not related to the feed flow, as it is fully governed by the airlift characteristics and the washer assembly configuration.\u00a0\u00a0<\/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-69b98db elementor-widget elementor-widget-heading\" data-id=\"69b98db\" 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 class=\"MsoBodyText3\" style=\"text-align:justify\">\n\n<\/p><p class=\"MsoBodyText3\" style=\"text-align:justify\"><b><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">Trouble shooting<\/span><\/b><\/p><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f17f41 elementor-widget elementor-widget-text-editor\" data-id=\"8f17f41\" 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: justify;\"><span lang=\"EN-US\" style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\">What if you checked your wash water flow and discovered your data are either too high or too low? We\u2019ll explain what might happen and what you could do.<\/span><\/p><p style=\"text-align: justify;\"><span lang=\"EN-US\" style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\">If the wash water flow is too low you do not have enough cleaning capacity and this might cause the filter performance to decrease. You might check the water level difference over the washer assembly and if there is room to increase this level difference by adjusting the wash water weir this might solve things.<\/span><\/p><p style=\"text-align: justify;\"><span lang=\"EN-US\" style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\">If the wash water flow is too high, this might lead to sand blockages in the washer, wash out of sand and loss of filter media. It is obvious that you would like to avoid this from happening. You might check the water level difference over the washer assembly and if possible reduce the level difference by adjusting the wash water discharge weir. Always secure to maintain the level difference at a minimum level of 50 mm.<\/span><\/p><p>\u00a0<\/p><p style=\"text-align: justify;\"><span lang=\"EN-US\" style=\"font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-latin; mso-ansi-language: EN-US;\">If you cannot manage to get your wash water flows within the acceptable range and would like to use some assistance, please\u00a0<a target=\"_blank\" href=\"https:\/\/brightwork.nl\/contact\/\" rel=\"noopener\"><i><b>contact us<\/b><\/i><\/a>.<\/span><\/p>\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 elementor-element-populated\">\n\t\t\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=\"225\" height=\"300\" src=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-225x300.png\" class=\"attachment-medium size-medium wp-image-7803\" alt=\"\" srcset=\"https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-225x300.png 225w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-338x450.png 338w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-768x1024.png 768w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-9x12.png 9w, https:\/\/brightwork.nl\/wp-content\/uploads\/2022\/03\/blog2-e1647867508594.png 470w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/>\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-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\"><a>Figure\u00a0<\/a>2. Washer assembly cross <a>section<\/a><\/p><p>\u00a0<\/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>In einem kontinuierlichen Filter findet der Filtrationsprozess gleichzeitig mit dem Waschen der Filtermedien statt. Der Waschprozess besteht aus zwei Prinzipien: dem hochturbulenten Lufttransport von verschmutztem Sand vom Boden des Filters zum oberen Ende des Filters und der abschlie\u00dfenden Trennung von Sandk\u00f6rnern und Feststoffen.<\/p>","protected":false},"author":2,"featured_media":7952,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[40],"tags":[],"class_list":["post-7800","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>Understanding the washing principle in continuous filters l Blog 2 - Brightwork BV<\/title>\n<meta name=\"description\" content=\"The washing process consists of two principles: the highly turbulent airlift transport of dirty sand from the bottom of the filter to the top of the filter and the final separation of sand grains and solids. 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