{"id":5914,"date":"2025-02-14T14:57:00","date_gmt":"2025-02-14T14:57:00","guid":{"rendered":"https:\/\/stark-water.com\/influent-quality-and-pretreatment-of-ro-membrane-process\/"},"modified":"2026-08-28T18:01:05","modified_gmt":"2026-08-28T10:01:05","slug":"ro-membrane-4","status":"publish","type":"post","link":"https:\/\/stark-water.com\/ar\/%d8%a7%d9%84%d9%85%d8%af%d9%88%d9%86%d8%a9\/ro-membrane-4\/","title":{"rendered":"Influent quality and pretreatment of RO membrane process"},"content":{"rendered":"

\u00a0<\/p>\n

RO Membrane fouling refers to the irreversible changes that occur when particles, colloidal substances, or macromolecules in a material interact physically, chemically, or mechanically with a membrane. This interaction leads to adsorption or deposition on the membrane surface or within its pores, causing pore narrowing or blockage, which in turn reduces permeate flux and impairs separation characteristics.\u00a0<\/span><\/span><\/p>\n

Based on the type of foulants, membrane fouling can be categorized into four types:<\/span><\/span><\/p>\n

    \n
  1. \n

    Inorganic fouling<\/strong>: Caused by sparingly soluble inorganic salts that easily form scale, such as carbonates and sulfates.\u00a0<\/span><\/span><\/p>\n<\/li>\n

  2. \n

    \u0627\u0644\u062a\u0644\u0648\u062b \u0627\u0644\u0639\u0636\u0648\u064a<\/strong>: Primarily due to dissolved organic substances like humic substances, polysaccharides, and proteins present in the feed water.\u00a0<\/span><\/span><\/p>\n<\/li>\n

  3. \n

    Colloidal fouling<\/strong>: Involves the accumulation of colloidal particles on the \u0627\u0644\u063a\u0634\u0627\u0621<\/a> surface.<\/span><\/span><\/p>\n<\/li>\n

  4. \n

    Biological fouling<\/strong>: Results from the growth and metabolic activities of microorganisms, leading to the formation of biofilms on the membrane.\u00a0<\/span><\/span><\/p>\n<\/li>\n<\/ol>\n

    Recent studies have shown that the properties of the membrane surface directly influence the extent of fouling in the following aspects:<\/span><\/span><\/p>\n

      \n
    1. \n

      Hydrophilicity of the membrane surface<\/strong>: Most foulants are hydrophobic. A hydrophilic membrane surface can bind with water molecules, forming a “free water” hydration layer that inhibits direct contact and adsorption of foulants on the membrane surface.\u00a0<\/span><\/span><\/p>\n<\/li>\n

    2. \n

      Surface roughness of the membrane<\/strong>: The closer the size of the foulants is to the roughness of the membrane surface, the more likely adsorption and deposition will occur on the membrane surface.\u00a0<\/span><\/span><\/p>\n<\/li>\n

    3. \n

      Charge of the membrane surface<\/strong>: Charged foulants can experience electrostatic attraction or repulsion with the \u0627\u0644\u063a\u0634\u0627\u0621<\/a> surface. When the charges of the foulants and the membrane surface are opposite, electrostatic attraction accelerates foulant adsorption.\u00a0<\/span><\/span><\/p>\n<\/li>\n

    4. \n

      Pore size of the membrane<\/strong>: When the \u0627\u0644\u063a\u0634\u0627\u0621<\/a> pore size is larger than the particle size of the foulants, the foulants can directly enter the membrane pores, leading to pore blockage.\u00a0<\/span><\/span><\/p>\n<\/li>\n<\/ol>\n

      \"\u063a\u0634\u0627\u0621
      \u063a\u0634\u0627\u0621 \u0627\u0644\u062a\u0646\u0627\u0636\u062d \u0627\u0644\u0639\u0643\u0633\u064a<\/figcaption><\/figure>\n

      Understanding these factors is crucial for developing strategies to mitigate \u0627\u0644\u063a\u0634\u0627\u0621<\/a> fouling and enhance membrane performance in various applications.
      <\/span><\/span><\/p>\n

      \u00a0<\/p>\n\n\n

      \"\u063a\u0634\u0627\u0621
      \u063a\u0634\u0627\u0621 \u0631\u0648<\/figcaption><\/figure>\n\n\n\n
      \"\u0623\u063a\u0634\u064a\u0629
      \u0623\u063a\u0634\u064a\u0629 \u0627\u0644\u062a\u0646\u0627\u0636\u062d \u0627\u0644\u0639\u0643\u0633\u064a<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"

      How to clean the RO membrane when it is blocked? As long as it is well treated, the RO membrane can be used for 3 years<\/p>","protected":false},"author":1,"featured_media":68905,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_joinchat":[],"footnotes":""},"categories":[1],"tags":[207,236],"class_list":["post-5914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-water-treatment-industry-information","tag-membrane","tag-ro-membrane"],"acf":[],"_links":{"self":[{"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/posts\/5914","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/comments?post=5914"}],"version-history":[{"count":1,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/posts\/5914\/revisions"}],"predecessor-version":[{"id":69140,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/posts\/5914\/revisions\/69140"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/media\/68905"}],"wp:attachment":[{"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/media?parent=5914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/categories?post=5914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stark-water.com\/ar\/wp-json\/wp\/v2\/tags?post=5914"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}