{"id":26596,"date":"2025-04-15T15:42:22","date_gmt":"2025-04-15T13:42:22","guid":{"rendered":"https:\/\/biogastechnik-sued.de\/home\/products\/heatogant-substrate-heat-exchanger-for-biogas-plants\/"},"modified":"2025-04-15T15:42:23","modified_gmt":"2025-04-15T13:42:23","slug":"heatogant-substrate-heat-exchanger-for-biogas-plants","status":"publish","type":"page","link":"https:\/\/biogastechnik-sued.de\/en\/home\/products\/heatogant-substrate-heat-exchanger-for-biogas-plants\/","title":{"rendered":"Heatogant substrate heat exchanger for biogas plants"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"26596\" class=\"elementor elementor-26596 elementor-26082\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4291ad7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4291ad7\" 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-f5cb3ad\" data-id=\"f5cb3ad\" 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-a1bf742 elementor-widget elementor-widget-heading\" data-id=\"a1bf742\" 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<h5 class=\"elementor-heading-title elementor-size-default\">Maximum energy efficiency through innovative substrate preheating<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a1a0b3e elementor-widget elementor-widget-heading\" data-id=\"a1a0b3e\" 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<h1 class=\"elementor-heading-title elementor-size-default\">Heatogant<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c3cc6f elementor-widget elementor-widget-heading\" data-id=\"7c3cc6f\" 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<h2 class=\"elementor-heading-title elementor-size-default\">Substrate-substrate heat exchanger for biogas plants  <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01b9e5b elementor-widget elementor-widget-text-editor\" data-id=\"01b9e5b\" 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><strong>Heatogant<\/strong> is the advanced <strong>substrate-substrate heat exchanger<\/strong> from Biogastechnik S\u00fcd GmbH, developed for efficient heat recovery in biogas plants. Particularly suitable for <strong>preheating liquid feedstock<\/strong> such as liquid manure or other residual materials, Heatogant uses the <strong>residual heat from fermentation residues<\/strong> and thus optimizes the <strong>energy efficiency<\/strong> of your biogas plant. <\/p>\n\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-f011b89 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f011b89\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;slideshow&quot;,&quot;background_slideshow_gallery&quot;:[],&quot;background_slideshow_loop&quot;:&quot;yes&quot;,&quot;background_slideshow_slide_duration&quot;:5000,&quot;background_slideshow_slide_transition&quot;:&quot;fade&quot;,&quot;background_slideshow_transition_duration&quot;:500}\">\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-50 elementor-top-column elementor-element elementor-element-ad2ff7d\" data-id=\"ad2ff7d\" 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-8be815a elementor-widget elementor-widget-image\" data-id=\"8be815a\" 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=\"879\" height=\"714\" src=\"https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/Heatogant-Beitragsbild-Webseite.jpg\" class=\"attachment-full size-full wp-image-26085\" alt=\"\" srcset=\"https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/Heatogant-Beitragsbild-Webseite.jpg 879w, https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/Heatogant-Beitragsbild-Webseite-300x244.jpg 300w, https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/Heatogant-Beitragsbild-Webseite-768x624.jpg 768w\" sizes=\"(max-width: 879px) 100vw, 879px\" \/>\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<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-114cc86\" data-id=\"114cc86\" 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-406d61b elementor-widget elementor-widget-text-editor\" data-id=\"406d61b\" 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<h2 style=\"text-align: left;\"><strong>How does the Heatogant heat exchanger work?<\/strong><\/h2>\n<p>The <strong>Heatogant<\/strong> combines a <a href=\"https:\/\/biogastechnik-sued.de\/en\/home\/products\/heat-exchangers-for-biogas-plants\/\"><strong>plate heat exchanger<\/strong> <\/a><strong>with <\/strong>an innovative <a href=\"https:\/\/biogastechnik-sued.de\/en\/home\/products\/returgant-direkt-with-ultrasonic-technology\/\"><strong>switching mimic<\/strong><\/a>which enables <strong>optimum heat transfer<\/strong>. The warm <strong>fermentation residue <\/strong>heats cold <strong>liquid manure<\/strong> or other liquid feedstock before it enters the fermenter. This drastically reduces the energy required to <strong>heat the substrate <\/strong>, and heating is no longer a challenge even with large quantities of liquid manure.  <\/p>\n<p>To ensure maximum efficiency and trouble-free heat transfer, we recommend a particle size of <strong>&lt;0<\/strong> <strong>.5 mm<\/strong> in the heat exchanger. To achieve this, we rely on the proven <a href=\"https:\/\/biogastechnik-sued.de\/en\/home\/products\/screw-press-separator-sepogant\/\"><strong>separation with our SEPOGANT press screw separator<\/strong><\/a>. This ensures reliable separation of coarse components and significantly reduces the proportion of solids in the liquid substrate. This not only guarantees the functionality of the Heatogant, but also reduces wear to a minimum &#8211; for long-term stable and efficient operation.   <\/p>\n\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-a1690a1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1690a1\" 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-26e4e2d\" data-id=\"26e4e2d\" 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-2f26ff5 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"2f26ff5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\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-9c404d2 elementor-widget elementor-widget-heading\" data-id=\"9c404d2\" 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<h2 class=\"elementor-heading-title elementor-size-default\">The advantages of a biogas \nsubstrate - substrate heat exchanger at a glance<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43ce0d5 elementor-widget elementor-widget-image\" data-id=\"43ce0d5\" 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<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"636\" src=\"https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/02_PWT_Waermetauscher-Modul_IMG_8504_Produktgrafik_Web_2025-2.jpg\" class=\"attachment-large size-large wp-image-26115\" alt=\"\" srcset=\"https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/02_PWT_Waermetauscher-Modul_IMG_8504_Produktgrafik_Web_2025-2.jpg 868w, https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/02_PWT_Waermetauscher-Modul_IMG_8504_Produktgrafik_Web_2025-2-300x238.jpg 300w, https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/2025\/03\/02_PWT_Waermetauscher-Modul_IMG_8504_Produktgrafik_Web_2025-2-768x611.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Illustration shows Heatogant as WTE2 module for GRV<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\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-cbb2aee elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cbb2aee\" 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-50 elementor-top-column elementor-element elementor-element-88a3de4\" data-id=\"88a3de4\" 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-7efcda7 elementor-widget elementor-widget-ucaddon_uc_diamond_bullets\" data-id=\"7efcda7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"ucaddon_uc_diamond_bullets.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n<!-- start Diamond Bullets -->\n\t\t<link id='font-awesome-css' href='https:\/\/biogastechnik-sued.de\/wp-content\/plugins\/unlimited-elements-for-elementor\/assets_libraries\/font-awesome6\/fontawesome-all.min.css' type='text\/css' rel='stylesheet' >\n\t\t<link id='font-awesome-4-shim-css' href='https:\/\/biogastechnik-sued.de\/wp-content\/plugins\/unlimited-elements-for-elementor\/assets_libraries\/font-awesome6\/fontawesome-v4-shims.min.css' type='text\/css' rel='stylesheet' >\n\t\t<link id='uc_ac_assets_file_uc_diamond_bullets_css_1981-css' href='https:\/\/biogastechnik-sued.de\/wp-content\/uploads\/ac_assets\/uc_diamond_bullets\/uc_diamond_bullets.css' type='text\/css' rel='stylesheet' >\n\n\n<div class=\"uc_diamond_bullets\">   \t\n    \t<div class=\"uc_container_holder\">\n          \t<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-thermometer-4\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">High heat transfer<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >Plate heat exchanger technology is significantly more efficient than conventional pipe systems.<\/span><\/p>\n  <\/div>\n<\/div>\n<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-thermometer-2\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">Optimum fermenter temperature<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >Prevents temperature fluctuations due to the cold slurry supply.<\/span><\/p>\n  <\/div>\n<\/div>\n<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-stumbleupon-circle\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">Automatic cleaning<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >The switching mimic prevents extreme deposits such as sand, fibers or, if necessary, struvite and ensures trouble-free operation of the heat exchanger.<\/span><\/p>\n  <\/div>\n<\/div>\n\n      <\/div>\n<\/div>\n<!-- end Diamond Bullets -->\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<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-96d7aec\" data-id=\"96d7aec\" 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-58af845 elementor-widget elementor-widget-ucaddon_uc_diamond_bullets\" data-id=\"58af845\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"ucaddon_uc_diamond_bullets.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n<!-- start Diamond Bullets -->\n\n\n<div class=\"uc_diamond_bullets\">   \t\n    \t<div class=\"uc_container_holder\">\n          \t<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-hand-peace-o\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">Lower emissions<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >Lowered storage temperatures (&lt;30\u00b0C in the slurry store) minimize the emission of ammonia and other pollutants. This results in lower emissions for the substrate at the end of the process. <\/span><\/p>\n  <\/div>\n<\/div>\n<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-battery\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">Energy saving<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >No additional heating energy required for slurry preheating.<\/span><\/p>\n  <\/div>\n<\/div>\n<div class=\"uc_diamond_bullets_row\">\n  <div class=\"uc_top_border\" style=\"background-color:#e7e7e7;\"><\/div>\n  <div class=\"uc_icon_holder\" style=\"border-color:#00723F; background-color:#ffffff;\"><i style=\"color:#00723F;\" class=\"fa fa-wrench\"><\/i><\/div>\n  <div class=\"uc_content_box\">\n    <h2 style=\"color:#414247\">Low maintenance<\/h2>\n    <p style=\"color:#999999\"><span  class=\"uc_style_uc_diamond_bullets_elementor_uc_items_attribute_content\" >The alternating flow directions effectively prevent clogging of the channels in the heat exchanger system, which reduces maintenance work to a minimum. The Heatogant can therefore be described as largely self-cleaning. <\/span><\/p>\n  <\/div>\n<\/div>\n\n      <\/div>\n<\/div>\n<!-- end Diamond Bullets -->\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-e1c3b0d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e1c3b0d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\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-bf1061f\" data-id=\"bf1061f\" 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-05fa92b elementor-widget elementor-widget-heading\" data-id=\"05fa92b\" 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<h2 class=\"elementor-heading-title elementor-size-default\">NEED MORE INFORMATION?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87a8a47 elementor-widget elementor-widget-heading\" data-id=\"87a8a47\" 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<h2 class=\"elementor-heading-title elementor-size-default\">Download technical information here or call us!<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-ef27b4d 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biogas plants Heatogant is the advanced substrate-substrate heat exchanger from Biogastechnik S\u00fcd GmbH, developed for efficient heat recovery in biogas plants. Particularly suitable for preheating liquid feedstock such as liquid manure or other residual materials, Heatogant uses the residual heat from fermentation residues [&hellip;]<\/p>\n","protected":false},"author":154380550,"featured_media":0,"parent":13260,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_theme","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-26596","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heatogant substrate heat exchanger for biogas plants - Biogastechnik S\u00fcd GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/biogastechnik-sued.de\/en\/home\/products\/heatogant-substrate-heat-exchanger-for-biogas-plants\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heatogant substrate heat exchanger for biogas plants - Biogastechnik S\u00fcd GmbH\" \/>\n<meta property=\"og:description\" content=\"Maximum energy efficiency through innovative substrate preheating Heatogant Substrate-substrate heat exchanger for biogas plants Heatogant is the advanced substrate-substrate heat exchanger from Biogastechnik S\u00fcd GmbH, developed for efficient heat recovery in biogas plants. 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