{"id":298,"date":"2026-07-08T15:36:48","date_gmt":"2026-07-08T07:36:48","guid":{"rendered":"https:\/\/www.rubri.cn\/products\/v2-product-2-8\/"},"modified":"2026-10-15T15:09:42","modified_gmt":"2026-10-15T07:09:42","slug":"v2-product-2-8","status":"publish","type":"indie_product","link":"https:\/\/www.rubri.cn\/en\/products\/product-equipment\/v2-product-2-8\/","title":{"rendered":"DD dialysis stack"},"content":{"rendered":"<p>Diffusion dialysis (DD) is a membrane separation technology driven by a concentration difference. It uses selective ion-exchange membranes to transfer solute ions such as acid radicals and hydroxide ions from the high-concentration side to the low-concentration side, enabling resource recovery from waste acid and waste alkali.<\/p>\n<h2>Classification<\/h2>\n<ul>\n<li>Diffusion dialysis anion-exchange membrane: provides acid permeability and salt retention, and can be used for separation and purification of acid from salts, and acid from organic matter.<\/li>\n<li>Diffusion dialysis cation-exchange membrane: provides alkali permeability and salt retention, and can be used for separation and purification of alkali from salts, and alkali from organic matter.<\/li>\n<\/ul>\n<h2>Recovery principle<\/h2>\n<ul>\n<li>Waste acid recovery: free acid radicals and hydrogen ions diffuse through the anion-exchange membrane to the clean water side to form regenerated acid, while heavy metals, salts, and impurities are retained.<\/li>\n<li>Waste alkali recovery: effective components such as hydroxide ions and sodium ions diffuse through the cation-exchange membrane for recovery, while impurities and macromolecular pollutants are retained.<\/li>\n<\/ul>\n<h2>Core advantages<\/h2>\n<ul>\n<li>Driven only by a concentration difference, with no power required and low operating energy consumption.<\/li>\n<li>Waste acid and waste alkali can be recovered, and the regenerated liquid can be reused in production processes.<\/li>\n<li>Operates at normal temperature and pressure, with no phase change, a simple process, and limited secondary pollution.<\/li>\n<li>The membrane module is corrosion-resistant and fouling-resistant, with relatively simple maintenance.<\/li>\n<\/ul>\n<h2>Application Fields<\/h2>\n<ul>\n<li>Waste acid recovery from pickling in metallurgical industries such as steel, copper, and aluminum processing.<\/li>\n<li>Waste acid and alkali recovery from surface treatment processes such as electroplating, passivation, and polishing.<\/li>\n<li>Treatment of chemical waste acids and alkalis from titanium dioxide, phosphate fertilizer, fine chemicals, and other industries.<\/li>\n<li>Resource recovery from acid and alkali waste liquids in new energy production such as lithium batteries and photovoltaics.<\/li>\n<li>Reduction and resource recovery disposal of industrial hazardous waste acid and alkali liquids.<\/li>\n<\/ul>\n<h2>Illustrative materials<\/h2>\n<div class=\"iw-media-grid\">\n<figure><img decoding=\"async\" width=\"800\" height=\"800\" src=\"\/wp-content\/uploads\/2026\/07\/v2-9aee0f6131e9.jpeg\" class=\"attachment-large size-large\" alt=\"DD \u6e17\u6790\u5668\" loading=\"lazy\" \/><figcaption>DD dialysis stack diagram<\/figcaption><\/figure>\n<figure><img decoding=\"async\" width=\"800\" height=\"800\" src=\"\/wp-content\/uploads\/2026\/09\/v2-5b2d786dc323.jpeg\" class=\"attachment-large size-large\" alt=\"DD \u6e17\u6790\u5668\" loading=\"lazy\" \/><figcaption>DD dialysis stack diagram<\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Uses concentration-gradient transport for selective acid or alkali recovery and separation from metal impurities.<\/p>","protected":false},"featured_media":127,"parent":306,"menu_order":30,"template":"","meta":{"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 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