{"id":358984,"date":"2026-03-25T16:44:06","date_gmt":"2026-03-25T11:14:06","guid":{"rendered":"https:\/\/forumias.com\/blog\/?p=358984"},"modified":"2026-03-25T16:44:06","modified_gmt":"2026-03-25T11:14:06","slug":"nalgonda-technique","status":"publish","type":"post","link":"https:\/\/forumias.com\/blog\/nalgonda-technique\/","title":{"rendered":"Nalgonda Technique"},"content":{"rendered":"<p><strong>News: <\/strong>The Government of India has commissioned a study to reassess fluoride removal technologies as existing standards based on the Nalgonda technique lag behind advancements.<\/p>\n<h2>About Nalgonda Technique<\/h2>\n<figure id=\"attachment_358986\" aria-describedby=\"caption-attachment-358986\" style=\"width: 427px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\" wp-image-358986\" src=\"https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/03\/Source-Research-Gate.jpg?resize=427%2C175&#038;ssl=1\" alt=\"Nalgonda Technique\" width=\"427\" height=\"175\" srcset=\"https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/03\/Source-Research-Gate.jpg?resize=300%2C123&amp;ssl=1 300w, https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/03\/Source-Research-Gate.jpg?resize=768%2C315&amp;ssl=1 768w, https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/03\/Source-Research-Gate.jpg?w=938&amp;ssl=1 938w\" sizes=\"auto, (max-width: 427px) 100vw, 427px\" \/><figcaption id=\"caption-attachment-358986\" class=\"wp-caption-text\">Source &#8211; Research Gate<\/figcaption><\/figure>\n<ul>\n<li>The Nalgonda technique is a <strong>simple and cost-effective method<\/strong> used for <strong>removing excess fluoride from drinking water.<\/strong><\/li>\n<li><strong>Developed by: <\/strong>It was developed by the <strong>National Environmental Engineering Research Institute (NEERI), Nagpur, in 1974.<\/strong><\/li>\n<li><strong>Chemicals used:\u00a0 <\/strong>The technique involves the <strong>sequential addition of three primary chemicals &#8211;<\/strong>\n<ul>\n<li><strong>Alum (aluminium sulphate):<\/strong> Acts as a <strong>coagulant<\/strong> that reacts with fluoride ions to <strong>form &#8220;flocs<\/strong>&#8220;.<\/li>\n<li><strong>Lime (calcium oxide):<\/strong> Added to <strong>maintain the pH<\/strong> of the water and ensure <strong>proper flocculation<\/strong>.<\/li>\n<li><strong>Bleaching powder:<\/strong> Used for disinfection to remove pathogens.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Process<\/strong>: The process follows <strong>four main sequential steps &#8211;\u00a0<\/strong>\n<ul>\n<li><strong>Rapid mixing:<\/strong> Chemicals (alum, lime, and bleaching powder) are added to the raw water and mixed vigorously, usually for 1\u20132 minutes, to ensure they are properly dispersed.<\/li>\n<li><strong>Flocculation:<\/strong> The mixture is stirred gently for a longer duration, typically 10\u201320 minutes. This allows the formation of large, settleable &#8220;flocs&#8221; as the chemicals react, which trap the fluoride ions.<\/li>\n<li><strong>Sedimentation:<\/strong> The water is allowed to remain undisturbed for about 1\u20132 hours. During this phase, the flocs formed in the previous step settle to the bottom due to gravity.<\/li>\n<li><strong>Filtration:<\/strong> The clear, treated supernatant water is separated from the settled sludge by passing it through filters, such as a rapid gravity sand filter.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Limitations:<\/strong> It produces <strong>high amounts of sludge<\/strong>, requires <strong>daily chemical addition<\/strong>\u00a0and is <strong>less effective in water with high total dissolved solids or hardness.<\/strong><\/li>\n<li><strong>Significance <\/strong>: It provides an <strong>affordable and practical solution for safe drinking water<\/strong> in fluoride-affected regions.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>News: The Government of India has commissioned a study to reassess fluoride removal technologies as existing standards based on the Nalgonda technique lag behind advancements. About Nalgonda Technique The Nalgonda technique is a simple and cost-effective method used for removing excess fluoride from drinking water. Developed by: It was developed by the National Environmental Engineering&hellip; <a class=\"more-link\" href=\"https:\/\/forumias.com\/blog\/nalgonda-technique\/\">Continue reading <span class=\"screen-reader-text\">Nalgonda Technique<\/span><\/a><\/p>\n","protected":false},"author":10393,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"categories":[1566,1738,12039],"tags":[11872],"class_list":["post-358984","post","type-post","status-publish","format-standard","hentry","category-daily-factly-articles","category-science-and-technology-daily-factly-articles","category-knolls","tag-9pm-daily-factly","entry"],"jetpack_featured_media_url":"","views":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts\/358984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/users\/10393"}],"replies":[{"embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/comments?post=358984"}],"version-history":[{"count":0,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts\/358984\/revisions"}],"wp:attachment":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/media?parent=358984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/categories?post=358984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/tags?post=358984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}