{"id":31200,"date":"2026-07-31T10:06:55","date_gmt":"2026-07-31T02:06:55","guid":{"rendered":"https:\/\/shchimay.com\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/"},"modified":"2026-07-31T10:06:55","modified_gmt":"2026-07-31T02:06:55","slug":"why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay","status":"publish","type":"post","link":"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/","title":{"rendered":"Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay"},"content":{"rendered":"<hr \/>\n<p>title: &ldquo;Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay&rdquo;<br \/>\ndate: 2026-07-08<br \/>\ncategory: Landfill &amp; Waste Water<br \/>\naudience: Technical Operations<br \/>\ntags: [foam fractionation, PFAS, turbidity monitoring, landfill leachate, Shanghai ChiMay]<\/p>\n<hr \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_50 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Why_Does_Foam_Fractionation_Need_Continuous_Turbidity_Monitoring_Insights_from_Shanghai_ChiMay\" title=\"Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay\">Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay<\/a><ul class='ez-toc-list-level-2'><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Key_Takeaways\" title=\"Key Takeaways\">Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#What_Foam_Fractionation_Does\" title=\"What Foam Fractionation Does\">What Foam Fractionation Does<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Where_Turbidity_Enters_the_Picture\" title=\"Where Turbidity Enters the Picture\">Where Turbidity Enters the Picture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#The_Three-Point_Turbidity_Strategy\" title=\"The Three-Point Turbidity Strategy\">The Three-Point Turbidity Strategy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Why_Continuous_Not_Grab_Samples\" title=\"Why Continuous, Not Grab Samples\">Why Continuous, Not Grab Samples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Fouling_Countermeasures_for_Turbidity_Sensors_on_Foam_Fractionation\" title=\"Fouling Countermeasures for Turbidity Sensors on Foam Fractionation\">Fouling Countermeasures for Turbidity Sensors on Foam Fractionation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Interaction_with_the_PFAS_Destruction_Stack\" title=\"Interaction with the PFAS Destruction Stack\">Interaction with the PFAS Destruction Stack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Regulatory_Context\" title=\"Regulatory Context\">Regulatory Context<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/shchimay.com\/ar\/why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 id=\"why-does-foam-fractionation-need-continuous-turbidity-monitoring-insights-from-shanghai-chimay\"><span class=\"ez-toc-section\" id=\"Why_Does_Foam_Fractionation_Need_Continuous_Turbidity_Monitoring_Insights_from_Shanghai_ChiMay\"><\/span>Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2 id=\"key-takeaways\"><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Foam fractionation is emerging as the front-end concentration step in the 2026 PFAS destruction stack, but its output quality varies with feed turbidity in ways that catch operators off guard.<\/li>\n<li>Turbidity monitoring at three points \u2014 foam column feed, foam column effluent and concentrate line \u2014 is the practical minimum for stable operation.<\/li>\n<li>Colloidal particles and residual biosolids interfere with air-water interface loading, reducing PFAS removal efficiency by 20 to 60 percent when uncontrolled.<\/li>\n<li>Shanghai ChiMay&rsquo;s online <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a> family fits this application because its NTU range and self-cleaning features match the working conditions of a foam fractionation column.<\/li>\n<\/ul>\n<h2 id=\"what-foam-fractionation-does\"><span class=\"ez-toc-section\" id=\"What_Foam_Fractionation_Does\"><\/span>What Foam Fractionation Does<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Foam fractionation (sometimes called surfactant-assisted flotation) exploits the amphiphilic nature of PFAS molecules to concentrate them at the air-water interface of finely dispersed bubbles. Rising bubbles carry PFAS to a foam layer, which is collected as a small-volume concentrate. Typical volume-reduction factors are 20:1 to 1000:1 depending on chain length and feed matrix. This concentration is what makes downstream destruction technologies \u2014 electrochemical oxidation, supercritical water oxidation (SCWO), hydrothermal alkaline treatment (HTA) \u2014 economically viable, because destruction cost scales with volume rather than with total water throughput.<\/p>\n<p>In the 2026 PFAS destruction stack that regulators now favor, foam fractionation typically sits between biological treatment and the destruction reactor. Its job is to shrink the treated water into a manageable slug of hazardous concentrate.<\/p>\n<h2 id=\"where-turbidity-enters-the-picture\"><span class=\"ez-toc-section\" id=\"Where_Turbidity_Enters_the_Picture\"><\/span>Where Turbidity Enters the Picture<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Foam fractionation is a surface chemistry process. PFAS molecules adsorb at the air-water interface of the bubbles, and the total interface area available depends on bubble size and stability. When the feed water carries suspended solids or colloids, three problems arise:<\/p>\n<ul>\n<li><strong>Interface competition.<\/strong> Colloidal organic particles adsorb to the same air-water surfaces PFAS want to occupy, reducing the effective loading of PFAS onto the foam.<\/li>\n<li><strong>Bubble destabilization.<\/strong> Surface-active biosolid fragments alter bubble stability, causing premature coalescence or excessive drainage, both of which reduce the concentration factor.<\/li>\n<li><strong>Concentrate contamination.<\/strong> A turbid feed produces a concentrate that carries not only PFAS but also biosolids and colloidal COD, complicating the destruction step downstream.<\/li>\n<\/ul>\n<p>For these reasons, foam fractionation designers specify feed turbidity below 10 NTU for stable operation, with 2\u20135 NTU preferred. Above 20 NTU, removal efficiency degrades rapidly.<\/p>\n<h2 id=\"the-three-point-turbidity-strategy\"><span class=\"ez-toc-section\" id=\"The_Three-Point_Turbidity_Strategy\"><\/span>The Three-Point Turbidity Strategy<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To operate foam fractionation reliably, Shanghai ChiMay&rsquo;s application team commonly recommends turbidity monitoring at three points.<\/p>\n<p><strong>Point 1: Column feed.<\/strong> This is the primary control point. If feed turbidity climbs above the design threshold, the upstream MBR or clarifier is not doing its job, and operators can respond in real time \u2014 either by adjusting coagulant dose, extending sedimentation time or partially bypassing the column until conditions recover.<\/p>\n<p><strong>Point 2: Column effluent.<\/strong> The effluent should be substantially clearer than the feed if the column is running correctly. When effluent turbidity approaches or exceeds feed turbidity, it signals that the column is short-circuiting or that foam is collapsing back into the water phase, releasing carried solids. Continuous monitoring at this point provides early warning of column upsets before they show up as compliance excursions downstream.<\/p>\n<p><strong>Point 3: Concentrate line.<\/strong> The foam concentrate itself is highly turbid, but tracking its turbidity trend gives operators a signal about foam quality. A stable, high turbidity indicates a well-loaded foam. A drop in concentrate turbidity often coincides with a drop in PFAS concentration factor, offering a low-cost surrogate for foam performance without needing PFAS lab analysis for every batch.<\/p>\n<p>Shanghai ChiMay&rsquo;s online <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a> family offers instruments spanning the low range (0\u201310 NTU) suitable for Points 1 and 2, and a higher range (0\u20131000 NTU or greater) suitable for Point 3. The transmitter can be configured with dual-range settings for streams that swing widely.<\/p>\n<h2 id=\"why-continuous-not-grab-samples\"><span class=\"ez-toc-section\" id=\"Why_Continuous_Not_Grab_Samples\"><\/span>Why Continuous, Not Grab Samples<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Foam fractionation is dynamic. Bubble generation rate, feed chemistry, water temperature and dissolved gas content all influence performance on time scales of minutes to hours. Grab sampling at, say, four-hour intervals misses transient events entirely. A single upstream biological reactor upset \u2014 for example, a partial nitrification collapse \u2014 can push feed turbidity from 5 NTU to 40 NTU in under an hour, and by the time the grab sample lab result returns, the foam column has already produced hours of substandard concentrate.<\/p>\n<p>Continuous turbidity monitoring closes this gap. With inline turbidity data flowing into the plant SCADA at one-minute intervals, operators can trigger automatic actions: dose additional coagulant, temporarily divert feed to storage, or lower foam column feed rate to compensate.<\/p>\n<h2 id=\"fouling-countermeasures-for-turbidity-sensors-on-foam-fractionation\"><span class=\"ez-toc-section\" id=\"Fouling_Countermeasures_for_Turbidity_Sensors_on_Foam_Fractionation\"><\/span>Fouling Countermeasures for Turbidity Sensors on Foam Fractionation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Foam fractionation is a fouling-prone application because it inherently produces surfactants and biofilm-favoring conditions. Turbidity sensors placed on foam columns need active fouling mitigation.<\/p>\n<p>Shanghai ChiMay&rsquo;s online <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a> units for this service typically ship with:<\/p>\n<ul>\n<li>Automatic ultrasonic cleaning integrated into the sensor body.<\/li>\n<li>Mechanical wiper option for the optical windows.<\/li>\n<li>Two-color LED optics that self-diagnose window transmission and alarm before the reading drifts.<\/li>\n<li>Chemical cleaning port for scheduled acidic or hypochlorite flushes.<\/li>\n<\/ul>\n<p>Operators still need a defined cleaning schedule, but the goal is that the sensor never becomes the weakest link in the control loop.<\/p>\n<h2 id=\"interaction-with-the-pfas-destruction-stack\"><span class=\"ez-toc-section\" id=\"Interaction_with_the_PFAS_Destruction_Stack\"><\/span>Interaction with the PFAS Destruction Stack<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Downstream destruction reactors \u2014 whether electrochemical oxidation with boron-doped diamond anodes, SCWO or HTA \u2014 have their own inlet quality specifications. Excess colloidal load in the foam concentrate reduces the current efficiency of electrochemical oxidation and fouls SCWO feed nozzles. By using continuous turbidity monitoring on both the concentrate and post-column effluent, operators can enforce the inlet spec of the destruction reactor rather than discovering violations after damage has been done.<\/p>\n<p>Shanghai ChiMay&rsquo;s turbidity data typically feeds into the same historian as the multi-parameter and COD data around the destruction reactor, allowing a unified compliance and operations dashboard.<\/p>\n<h2 id=\"regulatory-context\"><span class=\"ez-toc-section\" id=\"Regulatory_Context\"><\/span>Regulatory Context<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The April 2026 EPA rule listing nine PFAS as RCRA hazardous constituents has raised the bar for documentation across the entire PFAS treatment train. Turbidity is not a PFAS parameter per se, but its role as a surrogate for concentrate quality means that turbidity records are now part of the defensible operations file for many landfill sites. Regulators reviewing a foam fractionation performance record expect to see continuous turbidity trends alongside PFAS lab data, not one or the other.<\/p>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Foam fractionation is a surface chemistry process, and surface chemistry is exquisitely sensitive to feed water quality. Continuous turbidity monitoring at column feed, column effluent and concentrate line is the practical way to hold performance stable under real landfill leachate conditions. Shanghai ChiMay&rsquo;s online <a href=\"\/tag\/Turbidity-Tester\" target=\"_blank\"><strong>Turbidity Tester<\/strong><\/a> family provides instruments and self-cleaning features matched to this application, and its transmitter integration slots into the broader monitoring architecture that the post-April 2026 regulatory environment now demands. For operators building or upgrading a PFAS destruction stack, turbidity monitoring is not an accessory \u2014 it is a core part of making foam fractionation work as advertised.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>title: &ldquo;Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay&rdquo; date: 2026-07-08 category: Landfill &amp; Waste Water audience: Technical Operations tags: [foam fractionation, PFAS, turbidity monitoring, landfill leachate, Shanghai ChiMay] Why Does Foam Fractionation Need Continuous Turbidity Monitoring? Insights from Shanghai ChiMay Key Takeaways Foam fractionation is emerging as the front-end concentration&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[1],"tags":[134481,11066],"translation":{"provider":"WPGlobus","version":"2.12.0","language":"ar","enabled_languages":["en","es","fr","ru","ar"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"es":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/posts\/31200"}],"collection":[{"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/comments?post=31200"}],"version-history":[{"count":0,"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/posts\/31200\/revisions"}],"wp:attachment":[{"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/media?parent=31200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/categories?post=31200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shchimay.com\/ar\/wp-json\/wp\/v2\/tags?post=31200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}