{"id":67867,"date":"2026-02-10T12:49:15","date_gmt":"2026-02-10T12:49:15","guid":{"rendered":"https:\/\/roservicepoint.com\/services\/?p=67867"},"modified":"2026-02-10T12:49:21","modified_gmt":"2026-02-10T12:49:21","slug":"foaming-issues-in-effluent-treatment-plants","status":"publish","type":"post","link":"https:\/\/roservicepoint.com\/services\/foaming-issues-in-effluent-treatment-plants\/","title":{"rendered":"Foaming Issues in Effluent Treatment Plants: Causes, Impacts, and Practical Control Strategies"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Foaming in <a href=\"https:\/\/roservicepoint.com\/services\/tag\/effluent-treatment-plants\/\" type=\"post_tag\" id=\"249\">Effluent Treatment Plants<\/a> (ETPs) is one of the most visible yet complex operational challenges faced by industries worldwide. While foam floating on aeration tanks may appear to be a minor surface problem, it often signals deeper biological, chemical, or operational imbalances within the treatment system. Persistent foaming can disrupt treatment efficiency, damage mechanical infrastructure, increase operational costs, and create workplace safety hazards.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For industries operating under strict environmental discharge norms, unmanaged foaming is more than a nuisance \u2014 it is a compliance and performance risk. Understanding the science behind foam formation and implementing long-term preventive strategies is essential for stable and cost-effective plant operation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding the Nature of Foam in ETPs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What Leads to Foam Formation?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Foam develops when gas bubbles generated during aeration become stabilized by surface-active substances present in wastewater. Under normal conditions, air bubbles rise and burst quickly. However, when surfactants and organic compounds accumulate at the air-water interface, they create a protective film around bubbles, preventing them from collapsing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key foam-stabilizing substances include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Surfactants and detergents<\/li>\n\n\n\n<li>Fats, oils, and grease (FOG)<\/li>\n\n\n\n<li>Proteins and fatty acids<\/li>\n\n\n\n<li>Industrial emulsifiers<\/li>\n\n\n\n<li>Microbial by-products such as extracellular polymeric substances (EPS)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When these compounds are present in high concentrations, they trap air and create thick, stable foam layers that can spread across tank surfaces.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Temporary vs Persistent Foam<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not all foam indicates a critical problem. Operators must distinguish between short-term and chronic foaming:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Temporary Foam<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Occurs during plant startup or load fluctuations<\/li>\n\n\n\n<li>Appears light and unstable<\/li>\n\n\n\n<li>Dissipates once biological conditions stabilize<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Persistent Foam<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thick, dense, and long-lasting<\/li>\n\n\n\n<li>Covers aeration tanks and secondary clarifiers<\/li>\n\n\n\n<li>Often linked to microbial imbalance or chemical overload<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Persistent foam requires deeper process evaluation rather than superficial removal methods.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Root Causes of Foaming in Effluent Treatment Plants<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Excess Surfactants and Industrial Chemicals<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Industrial wastewater frequently contains cleaning agents, detergents, degreasers, and emulsifiers. These chemicals are designed to reduce surface tension \u2014 the very property that allows foam to stabilize.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many surfactants are resistant to biodegradation. When pretreatment is inadequate, they accumulate in biological reactors, making foam control through biological means alone extremely difficult.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Industries commonly contributing to surfactant loads include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Textile processing<\/li>\n\n\n\n<li>Pharmaceutical manufacturing<\/li>\n\n\n\n<li>Food processing<\/li>\n\n\n\n<li>Chemical production<\/li>\n\n\n\n<li>Metal finishing units<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without source control, foaming becomes a recurring operational burden.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Imbalance in Microbial Population<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Biological treatment relies on a balanced microbial ecosystem. When this balance is disturbed, certain filamentous bacteria begin to dominate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Filamentous organisms possess hydrophobic (water-repelling) cell surfaces that trap air bubbles. As they grow and float, they form thick, brown, stable foam layers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Conditions promoting filamentous growth include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low dissolved oxygen (DO)<\/li>\n\n\n\n<li>Nutrient deficiency (N &amp; P imbalance)<\/li>\n\n\n\n<li>High organic loading shocks<\/li>\n\n\n\n<li>Poor sludge wasting practices<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Unchecked filamentous proliferation not only causes foaming but also leads to sludge bulking and settling issues.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. High Fats, Oils, and Grease (FOG) Loading<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FOG is a major contributor to foam stability. It enters ETP systems from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Food and dairy industries<\/li>\n\n\n\n<li>Edible oil refineries<\/li>\n\n\n\n<li>Slaughterhouses<\/li>\n\n\n\n<li>Chemical and cosmetic plants<\/li>\n\n\n\n<li>Equipment maintenance washings<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">FOG reduces surface tension and coats biomass flocs, trapping gas bubbles. If oil skimming and grease traps in pretreatment are inefficient, these substances reach aeration tanks and intensify foaming.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Low Sludge Age and Process Upsets<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Young sludge systems with low Mean Cell Residence Time (MCRT) tend to produce more extracellular polymeric substances. EPS acts like glue, binding bubbles into foam mats.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Frequent hydraulic or organic shock loads further destabilize the biomass, leading to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rapid microbial growth<\/li>\n\n\n\n<li>Poor floc formation<\/li>\n\n\n\n<li>Increased foam generation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Maintaining optimal sludge age is therefore critical for foam control.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Improper Aeration Management<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aeration is essential for biological oxidation, but excess aeration can be counterproductive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Over-aeration results in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excessive bubble generation<\/li>\n\n\n\n<li>Turbulence at tank surfaces<\/li>\n\n\n\n<li>Increased foam stabilization<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When high airflow combines with surfactants and FOG, foam formation multiplies. Moreover, excess aeration wastes energy without improving oxygen transfer efficiency.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Operational Impacts of Foaming<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Reduced Treatment Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Foam carries active biomass out of aeration tanks, reducing Mixed Liquor Suspended Solids (MLSS) concentration. Lower biomass levels directly affect organic degradation capacity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consequences include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor BOD\/COD removal<\/li>\n\n\n\n<li>Fluctuating effluent quality<\/li>\n\n\n\n<li>Non-compliance with discharge norms<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In severe cases, sludge washout can destabilize the entire biological process.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Mechanical and Safety Hazards<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Foam overflow can interfere with plant instrumentation and machinery:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Level sensors malfunction<\/li>\n\n\n\n<li>Blowers face airflow resistance<\/li>\n\n\n\n<li>Pumps clog due to biomass carryover<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">From a safety standpoint, foam accumulation creates slippery surfaces, increasing the risk of operator accidents. Foam drift may also lead to odor complaints and environmental violations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Increased Operating Costs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Emergency foam control often relies on chemical antifoaming agents. While effective short term, excessive use leads to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Higher chemical expenditure<\/li>\n\n\n\n<li>Potential inhibition of microbial activity<\/li>\n\n\n\n<li>Increased sludge generation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Reactive foam management is always more expensive than preventive control.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Practical Solutions for Foaming Control<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Strengthening Influent Pretreatment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Effective pretreatment is the first defense against foaming.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key measures include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oil &amp; grease traps<\/li>\n\n\n\n<li>Dissolved Air Flotation (DAF) systems<\/li>\n\n\n\n<li>Equalization tanks<\/li>\n\n\n\n<li>Fine screening<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By removing foam-forming substances at the source, biological systems operate under stable conditions, reducing long-term foaming risk.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Maintaining Biological Stability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Balanced microbial health is essential.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Operators should monitor and control:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dissolved oxygen (2\u20134 mg\/L typical range)<\/li>\n\n\n\n<li>Sludge age (MCRT)<\/li>\n\n\n\n<li>Nutrient ratios (BOD:N:P \u2248 100:5:1)<\/li>\n\n\n\n<li>Sludge wasting rates<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Stable biology discourages filamentous dominance and limits foam-producing metabolites.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Optimizing Aeration Systems<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aeration should match actual oxygen demand \u2014 not exceed it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Optimization strategies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Variable frequency drives (VFDs) on blowers<\/li>\n\n\n\n<li>Fine bubble diffuser maintenance<\/li>\n\n\n\n<li>Zone-wise aeration control<\/li>\n\n\n\n<li>Oxygen uptake rate (OUR) monitoring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Proper airflow control reduces unnecessary bubble formation and energy consumption simultaneously.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Controlled Use of Antifoaming Agents<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Chemical antifoams provide rapid relief but must be used judiciously.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Best practices include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spot dosing instead of continuous addition<\/li>\n\n\n\n<li>Selecting biologically compatible formulations<\/li>\n\n\n\n<li>Monitoring downstream impacts<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Overdosing can coat biomass and hinder oxygen transfer, worsening treatment performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Process Monitoring and Early Intervention<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Proactive monitoring prevents small foam incidents from becoming operational crises.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key indicators to track:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Foam thickness and color<\/li>\n\n\n\n<li>Sludge Volume Index (SVI)<\/li>\n\n\n\n<li>DO fluctuations<\/li>\n\n\n\n<li>Influent surfactant loads<\/li>\n\n\n\n<li>Microscopic biomass examination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Early detection allows corrective adjustments before foam escalates.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Long-Term Foam Prevention Strategies<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Design and Infrastructure Modifications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering improvements can significantly reduce foam persistence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Deeper aeration basins<\/li>\n\n\n\n<li>Foam baffles and spray systems<\/li>\n\n\n\n<li>Optimized tank geometry<\/li>\n\n\n\n<li>Improved mixing patterns<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Plants designed for hydraulic and organic variability handle foaming better than rigid systems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Advanced Pretreatment Integration<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Industries with high surfactant or FOG loads benefit from advanced pretreatment such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Membrane separation<\/li>\n\n\n\n<li>Electrocoagulation<\/li>\n\n\n\n<li>Chemical oil breaking systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These technologies minimize biological stress and foam formation downstream.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Operator Training and Awareness<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Human expertise remains one of the most powerful foam control tools.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Well-trained operators can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identify early foaming signs<\/li>\n\n\n\n<li>Adjust aeration rates<\/li>\n\n\n\n<li>Modify sludge wasting<\/li>\n\n\n\n<li>Correct nutrient dosing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Process understanding reduces dependence on chemical quick fixes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Industry-Specific Foaming Risks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Certain sectors face higher foaming probability:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Industry<\/th><th>Primary Foam Contributors<\/th><\/tr><\/thead><tbody><tr><td>Textile<\/td><td>Detergents, dyes, surfactants<\/td><\/tr><tr><td>Food Processing<\/td><td>FOG, proteins<\/td><\/tr><tr><td>Pharma<\/td><td>Solvents, organics<\/td><\/tr><tr><td>Dairy<\/td><td>Fats, lactose, casein<\/td><\/tr><tr><td>Chemicals<\/td><td>Emulsifiers, polymers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Tailored pretreatment and biological control strategies are essential for these industries.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Environmental and Compliance Considerations<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Uncontrolled foaming can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Effluent discharge violations<\/li>\n\n\n\n<li>Odor complaints<\/li>\n\n\n\n<li>Surface water contamination<\/li>\n\n\n\n<li>Regulatory penalties<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Environmental authorities increasingly scrutinize visible plant emissions, including foam overflow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thus, foam control is both an operational and compliance priority.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Future Trends in Foam Management<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern ETPs are adopting smart monitoring and automation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AI-based aeration control<\/li>\n\n\n\n<li>Real-time surfactant sensors<\/li>\n\n\n\n<li>Automated antifoam dosing<\/li>\n\n\n\n<li>Digital twin process modeling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These innovations allow predictive foam management rather than reactive intervention.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Foaming in Effluent Treatment Plants is rarely an isolated surface issue. It is typically a symptom of deeper imbalances \u2014 whether chemical overload, microbial instability, pretreatment gaps, or aeration mismanagement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While temporary foam may occur during operational transitions, persistent foam demands systematic investigation and corrective action. Effective foam control requires a multi-pronged approach:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Influent load management<\/li>\n\n\n\n<li>Robust pretreatment<\/li>\n\n\n\n<li>Biological balance<\/li>\n\n\n\n<li>Optimized aeration<\/li>\n\n\n\n<li>Skilled plant operation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Facilities that prioritize process understanding over chemical suppression achieve more stable treatment performance, lower operating costs, and stronger regulatory compliance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Need Expert Guidance?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you are facing persistent foaming, treatment inefficiencies, or operational challenges in your water or wastewater treatment systems, professional assessment can make a significant difference.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Share your treatment concerns with industry specialists to identify root causes and implement sustainable solutions tailored to your plant needs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For technical assistance or consultation:<br><strong>Call:<\/strong> +91-9560654995<br><strong>Email:<\/strong> <a href=\"mailto:sales@vaqua.in\">sales@vaqua.in<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Foaming in Effluent Treatment Plants (ETPs) is one of the most visible yet complex operational challenges faced by industries worldwide&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":67887,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[249,248],"class_list":["post-67867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-effluent-treatment-plants","tag-etp-plant"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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