{"id":48,"date":"2011-08-04T11:16:57","date_gmt":"2011-08-04T15:16:57","guid":{"rendered":"http:\/\/umaine.edu\/pdc\/?page_id=48"},"modified":"2025-07-10T12:07:34","modified_gmt":"2025-07-10T16:07:34","slug":"bleaching","status":"publish","type":"page","link":"https:\/\/umaine.edu\/pdc\/facilities-available-for-use\/bleaching\/","title":{"rendered":"Bleaching"},"content":{"rendered":"\n<p>The main objective of bleaching is to produce a brighter pulp. This is accomplished in chemical pulps primarily through lignin removal. The removal of other compounds is another objective of the bleaching process. These compounds include resins, fatty acids, and other extractives.<\/p>\n\n\n\n<p>For many years the PDC has worked closely with the pulp and paper industry to develop new and effective bleaching sequences. We can perform a wide range of bleaching sequences on mechanical, recycled, and chemical pulps.\u00a0\u00a0The sequences may be comprised of a variety of stages, including chelation, enzyme, oxygen, ozone, chlorine, chlorine dioxide, extraction, and hydrogen peroxide stages.<\/p>\n\n\n<style>.kb-row-layout-id48_e99f44-13 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id48_e99f44-13 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id48_e99f44-13 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-xxs, 0.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id48_e99f44-13 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id48_e99f44-13 > .kt-row-column-wrap{padding-top:0px;padding-right:50px;padding-bottom:0px;padding-left:50px;grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id48_e99f44-13 > .kt-row-column-wrap{padding-right:25px;padding-left:25px;grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id48_e99f44-13 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column48_25695f-a4 > .kt-inside-inner-col,.kadence-column48_25695f-a4 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column48_25695f-a4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column48_25695f-a4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column48_25695f-a4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column48_25695f-a4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column48_25695f-a4{position:relative;}@media all and (max-width: 1024px){.kadence-column48_25695f-a4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column48_25695f-a4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column48_25695f-a4\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id48_5c2048-17 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id48_5c2048-17 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id48_5c2048-17 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-xxs, 0.5rem);grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id48_5c2048-17 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id48_5c2048-17 > .kt-row-column-wrap{padding-top:0px;padding-right:50px;padding-bottom:0px;padding-left:50px;grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id48_5c2048-17 > .kt-row-column-wrap{padding-right:25px;padding-left:25px;grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id48_5c2048-17 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column48_fb69ab-3c > .kt-inside-inner-col,.kadence-column48_fb69ab-3c > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column48_fb69ab-3c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column48_fb69ab-3c > .kt-inside-inner-col{flex-direction:column;}.kadence-column48_fb69ab-3c > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column48_fb69ab-3c > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column48_fb69ab-3c{position:relative;}@media all and (max-width: 1024px){.kadence-column48_fb69ab-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column48_fb69ab-3c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column48_fb69ab-3c\"><div class=\"kt-inside-inner-col\"><style>.kt-accordion-id48_4bb379-aa .kt-accordion-inner-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:2px;}.kt-accordion-id48_4bb379-aa .kt-accordion-panel-inner{padding-top:35px;padding-right:35px;padding-bottom:35px;padding-left:35px;}.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #d6d6d6;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;background:#f0f0f0;font-size:20px;line-height:24px;font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Oxygen-Sans,Ubuntu,Cantarell,\"Helvetica Neue\",sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\";text-transform:uppercase;color:#082e58;padding-top:23px;padding-right:23px;padding-bottom:23px;padding-left:23px;}.kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle 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.kt-accordion-id48_4bb379-aa .kt-blocks-accordion-header:focus-visible{color:#082e58;background:#f0f0f0;border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}.kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion--visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#082e58;}.kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger, body:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger{background:#082e58;}.kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#f0f0f0;}.kt-accordion-id48_4bb379-aa .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{background:#f0f0f0;border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}.kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id48_4bb379-aa:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#f0f0f0;}@media all and (max-width: 1024px){.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #d6d6d6;}}@media all and (max-width: 1024px){.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa .kt-blocks-accordion-header:focus-visible{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}}@media all and (max-width: 1024px){.kt-accordion-id48_4bb379-aa .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}}@media all and (max-width: 767px){.kt-accordion-id48_4bb379-aa .kt-accordion-inner-wrap{display:block;}.kt-accordion-id48_4bb379-aa .kt-accordion-inner-wrap .kt-accordion-pane:not(:first-child){margin-top:2px;}.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #d6d6d6;}.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id48_4bb379-aa .kt-blocks-accordion-header:focus-visible{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}.kt-accordion-id48_4bb379-aa .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id48_4bb379-aa > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top:1px solid #d6d6d6;border-right:1px solid #d6d6d6;border-bottom:1px solid #d6d6d6;border-left:10px solid #8ed1fc;}}<\/style>\n<div class=\"wp-block-kadence-accordion alignnone um-UMAccentAccordion\"><div class=\"kt-accordion-wrap kt-accordion-id48_4bb379-aa kt-accordion-has-4-panes kt-active-pane-1 kt-accordion-block kt-pane-header-alignment-left kt-accodion-icon-style-basiccircle kt-accodion-icon-side-right\" style=\"max-width:none\"><div class=\"kt-accordion-inner-wrap\" data-allow-multiple-open=\"false\" data-start-open=\"none\">\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-2 kt-pane48_0c2e7a-22\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Bleaching Equipment<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<ul class=\"wp-block-list\">\n<li>Medium consistency oxygen reactor<\/li>\n\n\n\n<li>Quantum reactor<\/li>\n\n\n\n<li>Laboratory bag bleaching apparatus (Cl<sub>2<\/sub>, ClO<sub>2<\/sub>, H<sub>2<\/sub>O<sub>2<\/sub>, E stage, H, FAS, etc.)<\/li>\n\n\n\n<li>Ozone generator and reactor<\/li>\n\n\n\n<li>100% ClO<sub>2<\/sub> generation reactor<\/li>\n\n\n\n<li>Stainless steel handsheet set-up<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-3 kt-pane48_fa207a-54\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Bleach Effluent Analysis<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<ul class=\"wp-block-list\">\n<li>Residuals and pH<\/li>\n\n\n\n<li>Chemical Oxygen Demand (COD)<\/li>\n\n\n\n<li>Biological Oxygen Demand (BOD)<\/li>\n\n\n\n<li>Total Dissolved Solids (TDS)<\/li>\n\n\n\n<li>Color<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-4 kt-pane48_954a7e-bd\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Capabilities<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<ul class=\"wp-block-list\">\n<li>Oxygen delignification of hardwood and softwood pulps<\/li>\n\n\n\n<li>Optimization and kinetics of oxygen delignification<\/li>\n\n\n\n<li>Evaluation of effects of pulping on bleachablity<\/li>\n\n\n\n<li>ECF and TCF bleaching of hardwood and softwood pulps<\/li>\n\n\n\n<li>Bleaching of mechanical and secondary fibers<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n\n<h4 class=\"wp-block-heading\">To begin working with us, visit our <a href=\"https:\/\/umaine.edu\/pdc\/working-with-us\/\">Working with the PDC<\/a> page.<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>The main objective of bleaching is to produce a brighter pulp. This is accomplished in chemical pulps primarily through lignin removal. The removal of other compounds is another objective of the bleaching process. These compounds include resins, fatty acids, and other extractives. For many years the PDC has worked closely with the pulp and paper [&hellip;]<\/p>\n","protected":false},"author":1159,"featured_media":0,"parent":13,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-48","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bleaching - The Process Development Center - University of Maine<\/title>\n<meta name=\"description\" content=\"The PDC has worked closely with the industry to develop new and effective bleaching sequences. 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