{"id":3483,"date":"2025-10-22T14:45:41","date_gmt":"2025-10-22T12:45:41","guid":{"rendered":"https:\/\/www.dosita.com\/?p=3483"},"modified":"2025-10-22T14:45:41","modified_gmt":"2025-10-22T12:45:41","slug":"reverse-osmosis-design-and-sizing","status":"publish","type":"post","link":"https:\/\/www.dosita.com\/en\/reverse-osmosis-design-and-sizing\/","title":{"rendered":"Reverse osmosis: design and sizing"},"content":{"rendered":"<p>To properly design and size a reverse osmosis system, it is necessary to evaluate hydraulic, chemical-physical, and operational parameters such as required flow rate, inlet water quality, pressure, membrane type, and treatment objectives.<\/p>\n<p>Here is a detailed overview:<\/p>\n<h4>Key parameters for sizing<\/h4>\n<p><strong>1. Required flow rate<\/strong><\/p>\n<ul>\n<li>Measured in liters\/hour or m\u00b3\/day.<\/li>\n<li>Determines the number of membranes and pump power.<\/li>\n<\/ul>\n<p><strong>2. Inlet water quality<\/strong><\/p>\n<ul>\n<li>Evaluation of:<\/li>\n<li>TDS (Total Dissolved Solids) in ppm.<\/li>\n<li>Electrical conductivity.<\/li>\n<li>pH, hardness, free chlorine, turbidity, presence of metals.<\/li>\n<li>Influences the choice of pretreatment and membrane type.<\/li>\n<\/ul>\n<p><strong>3. Operating pressure<\/strong><\/p>\n<ul>\n<li>Must exceed the osmotic pressure of the solution being treated.<\/li>\n<li>Typically between 6 and 70 bar, depending on salinity.<\/li>\n<\/ul>\n<p><strong>4. Recovery and Rejection<\/strong><\/p>\n<ul>\n<li>Recovery rate: % of treated water that becomes permeate (e.g., 50\u201375%).<\/li>\n<li>Rejection rate: % of salts removed (e.g., 95\u201399%).<\/li>\n<\/ul>\n<p><strong>5. Water Temperature<\/strong><\/p>\n<ul>\n<li>Affects membrane viscosity and permeability.<\/li>\n<li>Design data often refers to 25\u00b0C.<\/li>\n<\/ul>\n<h4>Components to Select<\/h4>\n<ul>\n<li>Osmotic Membranes<\/li>\n<li>Type: TFC (Thin Film Composite), polyamide.<\/li>\n<li>Size: 4&#8243; or 8&#8243; diameter.<\/li>\n<li>Number: calculated based on flow rate and recovery.<\/li>\n<li>High-pressure pump<\/li>\n<li>Power calculated based on flow rate and required pressure.<\/li>\n<li>Corrosion-resistant materials (e.g., AISI 316).<\/li>\n<li>Pre-filtration<\/li>\n<li>Sand filters, activated carbon, microfiltration.<\/li>\n<li>Antiscalant and dechlorination dosing.<\/li>\n<li>Control system<\/li>\n<li>PLC or digital controller.<\/li>\n<li>Pressure, conductivity, flow, and level sensors.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>To properly design and size a reverse osmosis system, it [&hellip;]<\/p>\n","protected":false},"author":8173,"featured_media":3481,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37],"tags":[],"class_list":["post-3483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/posts\/3483"}],"collection":[{"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/users\/8173"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/comments?post=3483"}],"version-history":[{"count":1,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/posts\/3483\/revisions"}],"predecessor-version":[{"id":3498,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/posts\/3483\/revisions\/3498"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/media\/3481"}],"wp:attachment":[{"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/media?parent=3483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/categories?post=3483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dosita.com\/en\/wp-json\/wp\/v2\/tags?post=3483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}