{"id":18968,"date":"2026-10-19T13:07:55","date_gmt":"2026-10-19T11:07:55","guid":{"rendered":"https:\/\/www.sebigas.it\/?page_id=18968"},"modified":"2026-10-27T17:29:40","modified_gmt":"2026-10-27T16:29:40","slug":"pfr","status":"publish","type":"page","link":"https:\/\/www.sebigas.it\/en\/biogas-technology\/pfr\/","title":{"rendered":"PFR plug-flow reactors"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Header&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#d6d6d6&#8243; background_image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/06\/radha_raman_.jpg&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;270px||0px||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;rgba(10,10,10,0.5)&#8221; custom_padding=&#8221;20px|20px|20px|20px|false|false&#8221; border_color_right=&#8221;#E09900&#8243; border_color_left=&#8221;#E09900&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;10px|||20px|false|false&#8221; border_width_left=&#8221;7px&#8221; border_color_left=&#8221;#F39606&#8243;][et_pb_post_title meta=&#8221;off&#8221; featured_image=&#8221;off&#8221; text_color=&#8221;light&#8221; admin_label=&#8221;Titolo del Post&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;|700|||||||&#8221; title_font_size=&#8221;28px&#8221; background_enable_color=&#8221;off&#8221; custom_margin=&#8221;0px||0px||false|false&#8221;][\/et_pb_post_title][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;#FFFFFF&#8221; background_layout=&#8221;dark&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;]<\/p>\n<h3>The plug-flow anaerobic reactor for solid biomass<\/h3>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Testo&#8221; module_class=&#8221;pl&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; background_enable_image=&#8221;off&#8221; custom_padding=&#8221;||||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row admin_label=&#8221;Table of contents&#8221; module_class=&#8221;indice&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;20px|20px|20px|20px|false|false&#8221; locked=&#8221;off&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;]<\/p>\n<h3>Table of contents<\/h3>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;]<\/p>\n<ul>\n<li><a href=\"#cose-e-a-cosa-serve\">What it is and what it is used for<\/a><\/li>\n<li><a href=\"#vantaggi\">Advantages<\/a><\/li>\n<li><a href=\"#come-funziona\">How it works<\/a><\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row make_equal=&#8221;on&#8221; admin_label=&#8221;What it is and what it is used for&#8221; module_class=&#8221;oh&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_column type=&#8221;4_4&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text module_id=&#8221;cose-e-a-cosa-serve&#8221; module_class=&#8221;anchor-offset&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;]<\/p>\n<h2>What an anaerobic PFR is and what it is used for<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#333333&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;]The <strong>PFR (Plug Flow Reactor)<\/strong> is suitable for treating biomass with a high dry substance content.<\/p>\n<p>This type of reactor uses <strong>plug flow<\/strong>, in which the organic material moves slowly and uniformly through the digester without the need for continuous mixing. The process takes place under anaerobic conditions, meaning in the absence of oxygen, allowing the biomass to be converted into biogas.<\/p>\n<p>These reactors are mainly used for <strong>renewable energy production<\/strong>, optimizing biogas yield while minimizing issues related to odour emissions.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;CTA&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; locked=&#8221;off&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;][et_pb_cta title=&#8221;Discover the feasibility of your project&#8221; button_url=&#8221;#contact_form&#8221; button_text=&#8221;Get More Information&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; header_text_color=&#8221;#FFFFFF&#8221; header_font_size=&#8221;22px&#8221; body_font_size=&#8221;18px&#8221; background_color=&#8221;#48AF66&#8243; custom_button=&#8221;on&#8221; button_text_size=&#8221;16px&#8221; button_text_color=&#8221;#FFFFFF&#8221; custom_padding=&#8221;20px||20px||false|false&#8221; button_border_width_last_edited=&#8221;off|desktop&#8221; border_color_all=&#8221;#000000&#8243; background__hover_enabled=&#8221;off|hover&#8221; background_color__hover=&#8221;#ec6608&#8243; background_enable_color__hover=&#8221;on&#8221; button_border_width__hover_enabled=&#8221;on|hover&#8221; button_border_width__hover=&#8221;2px&#8221; button_border_color__hover_enabled=&#8221;on|hover&#8221; button_border_color__hover=&#8221;#FFFFFF&#8221; button_text_color__hover_enabled=&#8221;on|hover&#8221; button_text_color__hover=&#8221;#FFFFFF&#8221;][\/et_pb_cta][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Infografica&#8221; module_class=&#8221;pl&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#F4F7E0&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; collapsed=&#8221;off&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;]<\/p>\n<h2>How does the PFR work<\/h2>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/10\/pfr-1.webp&#8221; alt=&#8221;cstr&#8221; title_text=&#8221;pfr&#8221; show_in_lightbox=&#8221;on&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Testo&#8221; module_class=&#8221;pd&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; background_enable_image=&#8221;off&#8221; custom_padding=&#8221;||||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row column_structure=&#8221;1_2,1_2&#8243; make_equal=&#8221;on&#8221; admin_label=&#8221;Advantages&#8221; module_class=&#8221;oh&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Immagine&#8221; disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_enable_image=&#8221;off&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/06\/plug-flow-reactor-.jpg&#8221; min_height=&#8221;350px&#8221; height=&#8221;100%&#8221; locked=&#8221;off&#8221;][\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Testo&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text module_id=&#8221;vantaggi&#8221; module_class=&#8221;anchor-offset&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;]<\/p>\n<h2>Advantages of the PFR<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#333333&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;]Why choose a plug-flow reactor (PFR)?<\/p>\n<p>From an engineering and process perspective, <strong>PFR offers numerous advantages<\/strong>:<\/p>\n<ul>\n<li><strong>Suitable for small digestion volumes and highly fibrous biomass or feedstocks rich in impurities<\/strong>: it optimizes yield in limited spaces and with more challenging materials such as fibres<\/li>\n<li>It helps <strong>reduce the volume of liquid digestate<\/strong> to be managed, thanks to the lower need for dilution water<\/li>\n<li><strong>Efficiency and precise process control<\/strong>, thanks to the sequential separation of the anaerobic digestion stages<\/li>\n<li>It enables a more controlled <strong>retention time<\/strong> for biomass in the digester, reducing the risk of fresh material bypass and promoting more effective degradation of the organic fraction<\/li>\n<li><strong>Reduced electricity consumption<\/strong>, thanks to the absence of continuous mixing<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row make_equal=&#8221;on&#8221; admin_label=&#8221;Applications&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221; locked=&#8221;off&#8221;][et_pb_column type=&#8221;4_4&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221; custom_padding_tablet=&#8221;||||false|false&#8221; custom_padding_phone=&#8221;&#8221; custom_padding_last_edited=&#8221;on|desktop&#8221;][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#333333&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;]For these reasons, PFR are suitable for processing <strong>highly fibrous and difficult-to-digest biomass<\/strong>, such as <strong>straw, high-fibre manure, lignocellulosic by-products, and OFMSW with a high impurity content<\/strong>.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_4,1_4,1_4,1_4&#8243; 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make_equal=&#8221;on&#8221; admin_label=&#8221;How it works&#8221; module_class=&#8221;oh&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text admin_label=&#8221;Testo&#8221; module_id=&#8221;come-funziona&#8221; module_class=&#8221;anchor-offset&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221;]<\/p>\n<h2>How does the PFR work<\/h2>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Testo&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#333333&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;]The plug-flow reactor (PFR) consists of:<\/p>\n<ul>\n<li><b>A pretreatment system<\/b> selected according to the specific characteristics of the biomass and designed to maximise the anaerobic digestion process<\/li>\n<li><b>Material handling systems<\/b> that ensure the substrate moves slowly and steadily through the reactor<\/li>\n<li><b>A heating system<\/b> to maintain the ideal thermal conditions for digestion<\/li>\n<li><b>Biogas extraction systems<\/b> that collect the biogas produced by the process<\/li>\n<li><b>A pumping system or screw conveyors<\/b> for feeding and discharging the digestate.<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_blurb title=&#8221;DRY SUBSTANCE&#8221; image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/09\/icon_brochure_secca.png&#8221; icon_placement=&#8221;left&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;||||||||&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;10px||10px||false|false&#8221; border_color_all=&#8221;#666666&#8243; border_width_bottom=&#8221;1px&#8221;]15% &lt; DS &lt; 35%[\/et_pb_blurb][et_pb_blurb title=&#8221;THERMAL REGIME&#8221; image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/09\/icon_brochure_termico.png&#8221; icon_placement=&#8221;left&#8221; admin_label=&#8221;Blur&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;||||||||&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;10px||10px||false|false&#8221; border_color_all=&#8221;#666666&#8243; border_width_bottom=&#8221;1px&#8221;]Mesophilic or thermophilic[\/et_pb_blurb][et_pb_blurb title=&#8221;HYDRAULIC RETENTION TIME&#8221; image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/09\/icon_brochure_ritenzione.png&#8221; icon_placement=&#8221;left&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;||||||||&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;10px||10px||false|false&#8221; border_color_all=&#8221;#666666&#8243; border_width_bottom=&#8221;1px&#8221;]20 &lt; days &lt; 60[\/et_pb_blurb][et_pb_blurb title=&#8221;MIXING SYSTEM&#8221; image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/09\/icon_brochure_miscelazione.png&#8221; icon_placement=&#8221;left&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;||||||||&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;10px||10px||false|false&#8221;]Mechanical, internal to the reactor, with slow-speed mixers[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; make_equal=&#8221;on&#8221; admin_label=&#8221;How it works&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; background_image=&#8221;https:\/\/www.sebigas.it\/wp-content\/uploads\/2026\/06\/plug-flow-municipal-solid-waste.jpg&#8221; min_height=&#8221;350px&#8221; height=&#8221;100%&#8221; locked=&#8221;off&#8221;][\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; admin_label=&#8221;Column&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221;][et_pb_text admin_label=&#8221;Testo&#8221; _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#333333&#8243; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;||||false|false&#8221;]In this type of reactor, the anaerobic digestion process takes place at <strong>controlled temperatures<\/strong> and with a <strong>dry substance content between 15% and 35%<\/strong>.<\/p>\n<p>The digestion process also takes place under mesophilic conditions, at approximately 40 \u00b0C, or thermophilic conditions, at approximately 50\u201355 \u00b0C, with retention times ranging from 20 to 60 days depending on the types of biomass used to feed the plant.<\/p>\n<p>PFR enables the construction of <strong>high-performance biogas production plants<\/strong>, making effective use of biomass with a higher dry substance content.<\/p>\n<p>Technology supplied in partnership with <a href=\"https:\/\/arciplug.com\/\" target=\"_blank\"><span style=\"font-size: 18px;\">Arciplug\u00ae<\/span><\/a> \u2014 patented Plug-Flow technology.[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; 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custom_margin=&#8221;0px||0px||false|false&#8221;][\/et_pb_post_title][et_pb_text _builder_version=&#8221;4.7.4&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;#FFFFFF&#8221; background_layout=&#8221;dark&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;] The plug-flow anaerobic reactor for solid [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":18799,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-18968","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PFR reactor: high dry matter biomass | SEBIGAS<\/title>\n<meta name=\"description\" content=\"Choose the PFR reactor to 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