{"id":1672,"date":"2026-08-26T14:36:53","date_gmt":"2026-08-26T12:36:53","guid":{"rendered":"https:\/\/swissdest.com\/wp-aquaren\/?p=1672"},"modified":"2026-10-02T20:32:26","modified_gmt":"2026-10-02T18:32:26","slug":"naturumlauf-oder-zwangsumlauf","status":"publish","type":"post","link":"https:\/\/aquaren.com\/en\/naturumlauf-oder-zwangsumlauf\/","title":{"rendered":"Natural Circulation or Forced Circulation: Which Evaporator Technology Is Right for Which Wastewater?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Vacuum evaporators enable industrial wastewater to be efficiently treated and concentrated, while recovering a large proportion of the water as distillate. However, not all wastewater is the same. Different system concepts are used depending on the wastewater composition and process requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For our swissDest vacuum evaporators, we therefore use two proven processes: <strong>natural circulation and forced circulation.<\/strong>Both are based on vacuum distillation with direct vapor recompression, but differ in how the medium being treated is circulated within the system.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1913\" height=\"950\" src=\"https:\/\/swissdest.com\/wp-aquaren\/wp-content\/uploads\/2026\/08\/Unbenannt-1.jpg\" alt=\"Unterschiedliche Umlaufprinzipien erm\u00f6glichen eine optimale Anpassung der Verdampfertechnologie an das zu behandelnde Medium.\" class=\"wp-image-1674\" srcset=\"https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-1.jpg 1913w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-1-300x149.jpg 300w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-1-767x381.jpg 767w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-1-1024x509.jpg 1024w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-1-1536x763.jpg 1536w\" sizes=\"auto, (max-width: 1913px) 100vw, 1913px\" \/><figcaption class=\"wp-element-caption\">Evaporator Technology \u2013 Natural Circulation &amp; Falling Film<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Natural Circulation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In natural circulation, the medium circulates due to density differences generated during the evaporation process. No additional mechanical circulation pump is required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces the number of moving components and allows for a comparatively simple and compact system design. At the same time, the evaporation process operates automatically.<\/p>\n\n\n<style>.kb-image1672_b29907-a1 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image1672_b29907-a1 size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"592\" src=\"https:\/\/swissdest.com\/wp-aquaren\/wp-content\/uploads\/2026\/08\/Unbenannt-2-1024x592.jpg\" alt=\"Funktionsprinzip eines Vakuumverdampfers mit direkter Br\u00fcdenverdichtung im Naturumlauf.\" class=\"kb-img wp-image-1675\" srcset=\"https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-2-1024x592.jpg 1024w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-2-300x173.jpg 300w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-2-768x444.jpg 768w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/Unbenannt-2.jpg 1390w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages of Natural Circulation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>few moving components<\/li>\n\n\n\n<li>no additional circulation pump required<\/li>\n\n\n\n<li>automated operation<\/li>\n\n\n\n<li>comparatively low investment costs<\/li>\n\n\n\n<li>energy consumption from approx. 30 kWh\/m\u00b3<\/li>\n\n\n\n<li>complete disinfection through the evaporation process<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, natural circulation can reach its limits with media that have a strong tendency to foam or form deposits. In these cases, more frequent cleaning may be required.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Forced Circulation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In forced circulation, an additional circulation pump actively moves the medium through the evaporator. This allows the circulation to be controlled and keeps the medium continuously in motion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As a result, the process is less sensitive to foaming and reduces the tendency for fouling within the system. Forced circulation is particularly advantageous for more challenging or saline media.<\/p>\n\n\n<style>.kb-image1672_d0227a-cf .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image1672_d0227a-cf\"><img loading=\"lazy\" decoding=\"async\" width=\"1360\" height=\"800\" src=\"https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/2.jpg\" alt=\"Funktionsprinzip eines Vakuumverdampfers mit direkter Br\u00fcdenverdichtung im Naturumlauf.\" class=\"kb-img wp-image-1676\" srcset=\"https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/2.jpg 1360w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/2-300x176.jpg 300w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/2-1024x602.jpg 1024w, https:\/\/aquaren.com\/wp-content\/uploads\/2026\/08\/2-768x452.jpg 768w\" sizes=\"auto, (max-width: 1360px) 100vw, 1360px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages of Forced Circulation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>low sensitivity to foaming<\/li>\n\n\n\n<li>reduced tendency for fouling<\/li>\n\n\n\n<li>automated process<\/li>\n\n\n\n<li>automated CIP cleaning<\/li>\n\n\n\n<li>energy consumption from approx. 30 kWh\/m\u00b3<\/li>\n\n\n\n<li>complete disinfection<\/li>\n\n\n\n<li>particularly suitable for saline media<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The additional circulation pump makes the system more complex and therefore requires a higher investment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Natural Circulation or Forced Circulation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both processes pursue the same objective but differ in their technical design and ideal areas of application.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Natural Circulation<\/th><th>Forced Circulation<\/th><\/tr><tr><td>Natural circulation<\/td><td>Active circulation using a circulation pump<\/td><\/tr><tr><td>Few moving components<\/td><td>Additional circulation pump<\/td><\/tr><tr><td>Lower investment<\/td><td>Higher investment<\/td><\/tr><tr><td>More sensitive to foaming and deposits<\/td><td>Lower sensitivity to foaming and fouling<\/td><\/tr><tr><td>For suitable, less challenging media<\/td><td>Particularly suitable for challenging and saline media<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Which Technology Is Right for Your Application?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Which option is suitable for a particular application depends primarily on the composition of the wastewater and the requirements of the respective process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key factors include salt content, foaming, fouling tendency and the required treatment performance. At Aquaren, we therefore consider not only the required system size but also the characteristics of the medium to be treated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Based on these factors, the swissDest system can be designed to ensure that the process technology and application are optimally matched.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Would You Like to Know Which Evaporator Technology Is Right for Your Wastewater?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We support you in selecting and designing the right swissDest system for your application.<\/p>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns1672_4f55ee-1c{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:flex-start;align-items:center;}.kt-btns1672_4f55ee-1c .kt-button{font-weight:normal;font-style:normal;}.kt-btns1672_4f55ee-1c .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns1672_4f55ee-1c .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns1672_4f55ee-1c\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn1672_3e3aab-6f.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn1672_3e3aab-6f kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-inherit kt-btn-has-text-true kt-btn-has-svg-false wp-block-button__link wp-block-kadence-singlebtn\" href=\"https:\/\/aquaren.com\/en\/kontakt\/\"><span class=\"kt-btn-inner-text\">Contact Us<\/span><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Vacuum evaporators enable industrial wastewater to be efficiently treated and concentrated, while recovering a large proportion of the water as distillate. However, not all wastewater is the same. Depending on its composition and the process requirements, different system concepts are used. For our swissDest vacuum evaporators, we therefore rely on two proven processes: natural circulation and forced circulation. Both are based on...<\/p>","protected":false},"author":2,"featured_media":1624,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein"],"_links":{"self":[{"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/posts\/1672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/comments?post=1672"}],"version-history":[{"count":3,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/posts\/1672\/revisions"}],"predecessor-version":[{"id":2245,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/posts\/1672\/revisions\/2245"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/media\/1624"}],"wp:attachment":[{"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/media?parent=1672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/categories?post=1672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aquaren.com\/en\/wp-json\/wp\/v2\/tags?post=1672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}