{"id":30605,"date":"2026-05-16T12:27:36","date_gmt":"2026-05-16T04:27:36","guid":{"rendered":"https:\/\/shchimay.com\/the-science-of-water-disinfection-what-every-water\/"},"modified":"2026-05-16T12:27:36","modified_gmt":"2026-05-16T04:27:36","slug":"the-science-of-water-disinfection-what-every-water","status":"publish","type":"post","link":"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/","title":{"rendered":"The Science of Water Disinfection: What Every Water Professional Should Know"},"content":{"rendered":"<p><strong>Key Takeaways:<\/strong><\/p>\n<ul>\n<li>Water disinfection relies on multiple mechanisms including oxidation, membrane damage, and protein denaturation<\/li>\n<li>Different disinfection technologies offer distinct advantages and limitations<\/li>\n<li>Understanding inactivation kinetics helps optimize treatment for specific pathogens<\/li>\n<li>ChiMay&#39;s comprehensive monitoring solutions support all major disinfection technologies<\/li>\n<\/ul>\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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Introduction\" title=\"Introduction\">Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Understanding_Microbial_Threats\" title=\"Understanding Microbial Threats\">Understanding Microbial Threats<\/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\/zh\/the-science-of-water-disinfection-what-every-water\/#Disinfection_Mechanisms\" title=\"Disinfection Mechanisms\">Disinfection Mechanisms<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Reaction_Kinetics\" title=\"Reaction Kinetics\">Reaction Kinetics<\/a><\/li><\/ul><\/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\/zh\/the-science-of-water-disinfection-what-every-water\/#Chlorine_Disinfection\" title=\"Chlorine Disinfection\">Chlorine Disinfection<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Chemistry_of_Chlorine\" title=\"Chemistry of Chlorine\">Chemistry of Chlorine<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Chlorine_Effectiveness_Factors\" title=\"Chlorine Effectiveness Factors\">Chlorine Effectiveness Factors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Chlorine_Byproducts\" title=\"Chlorine Byproducts\">Chlorine Byproducts<\/a><\/li><\/ul><\/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\/zh\/the-science-of-water-disinfection-what-every-water\/#UV_Disinfection\" title=\"UV Disinfection\">UV Disinfection<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Physics_of_UV_Light\" title=\"Physics of UV Light\">Physics of UV Light<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#UV_Dose-Response\" title=\"UV Dose-Response\">UV Dose-Response<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#UV_System_Components\" title=\"UV System Components\">UV System Components<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Ozone_Effectiveness\" title=\"Ozone Effectiveness\">Ozone Effectiveness<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Ozone_Byproducts\" title=\"Ozone Byproducts\">Ozone Byproducts<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Chloramine_Disinfection\" title=\"Chloramine Disinfection\">Chloramine Disinfection<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/shchimay.com\/zh\/the-science-of-water-disinfection-what-every-water\/#Chloramine_Formation\" title=\"Chloramine Formation\">Chloramine Formation<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Water disinfection represents one of the greatest public health achievements of the modern era, preventing countless waterborne disease outbreaks and enabling urbanization on a global scale. Yet the science behind disinfection remains poorly understood by many water professionals. This comprehensive guide explains the fundamental mechanisms, technologies, and considerations that every water professional should master.<\/p>\n<p>According to the <strong>U.S. Environmental Protection Agency (EPA)<\/strong>, drinking water treatment has reduced waterborne disease incidence by over <strong>95%<\/strong> since the implementation of modern disinfection practices. Understanding this science enables water professionals to optimize treatment, reduce costs, and ensure continued protection of public health.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_Microbial_Threats\"><\/span>Understanding Microbial Threats<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Bacteria<\/strong><\/p>\n<p>Single-celled organisms capable of independent reproduction:<\/p>\n<ul>\n<li><strong>Escherichia coli (E. coli)<\/strong>: Indicator organism; some strains pathogenic<\/li>\n<li><strong>Legionella pneumophila<\/strong>: Causes Legionnaires&#39; disease<\/li>\n<li><strong>Pseudomonas aeruginosa<\/strong>: Opportunistic pathogen; healthcare-associated infections<\/li>\n<li><strong>Salmonella<\/strong>: Gastrointestinal illness; 1.35 million annual infections in the US<\/li>\n<\/ul>\n<p><strong>Viruses<\/strong><\/p>\n<p>Non-living particles requiring host cells for reproduction:<\/p>\n<ul>\n<li><strong>Norovirus<\/strong>: Leading cause of viral gastroenteritis; 20 million annual cases in US<\/li>\n<li><strong>Rotavirus<\/strong>: Leading cause of severe diarrhea in children<\/li>\n<li><strong>Adenovirus<\/strong>: Respiratory and gastrointestinal illness<\/li>\n<li><strong>Hepatitis A<\/strong>: Liver infection; 3,000-4,000 annual US cases<\/li>\n<\/ul>\n<p><strong>Protozoa<\/strong><\/p>\n<p>Single-celled parasites with resistant cyst stages:<\/p>\n<ul>\n<li><strong>Cryptosporidium<\/strong>: Chlorine-resistant; 748,000 annual US infections<\/li>\n<li><strong>Giardia lamblia<\/strong>: Beaver fever; 1.2 million annual US infections<\/li>\n<li><strong>Entamoeba histolytica<\/strong>: Amoebic dysentery; 50 million annual global infections<\/li>\n<\/ul>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>Pathogen<\/th>\n<th>Size<\/th>\n<th>Chlorine Resistance<\/th>\n<th>UV Sensitivity<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bacteria<\/td>\n<td>0.5-5 \u03bcm<\/td>\n<td>Low<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>Viruses<\/td>\n<td>0.02-0.3 \u03bcm<\/td>\n<td>Moderate<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>Protozoa (cysts)<\/td>\n<td>3-15 \u03bcm<\/td>\n<td>Very High<\/td>\n<td>Moderate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Disinfection_Mechanisms\"><\/span>Disinfection Mechanisms<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Oxidation<\/strong><\/p>\n<p>Chemical oxidants damage cellular components:<\/p>\n<ul>\n<li><strong>Protein oxidation<\/strong>: Disrupts enzyme function<\/li>\n<li><strong>Lipid peroxidation<\/strong>: Destroys cell membranes<\/li>\n<li><strong>DNA damage<\/strong>: Prevents reproduction<\/li>\n<li><strong>Cofactor oxidation<\/strong>: Interrupts metabolic pathways<\/li>\n<\/ul>\n<p><strong>Membrane Damage<\/strong><\/p>\n<p>Physical disruption of cellular barriers:<\/p>\n<ul>\n<li><strong>Membrane permeabilization<\/strong>: Loss of cellular contents<\/li>\n<li><strong>Oxidative membrane attack<\/strong>: Protein and lipid damage<\/li>\n<li><strong>Electrostatic disruption<\/strong>: Alters membrane potential<\/li>\n<\/ul>\n<p><strong>Protein Denaturation<\/strong><\/p>\n<p>Structural disruption of functional proteins:<\/p>\n<ul>\n<li><strong>Enzyme inactivation<\/strong>: Stops metabolic processes<\/li>\n<li><strong>Structural protein damage<\/strong>: Weakens cellular structure<\/li>\n<li><strong>Transport protein disruption<\/strong>: Impairs nutrient transport<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Reaction_Kinetics\"><\/span>Reaction Kinetics<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Chick&#39;s Law<\/strong><\/p>\n<p>First-order inactivation kinetics describe most disinfection processes:<\/p>\n<p><strong>N = N\u2080 \u00d7 e^(-k \u00d7 C \u00d7 t)<\/strong><\/p>\n<p>Where:<\/p>\n<ul>\n<li><strong>N<\/strong> = Number of surviving organisms<\/li>\n<li><strong>N\u2080<\/strong> = Initial number of organisms<\/li>\n<li><strong>k<\/strong> = Inactivation rate constant<\/li>\n<li><strong>C<\/strong> = Disinfectant concentration<\/li>\n<li><strong>t<\/strong> = Contact time<\/li>\n<\/ul>\n<p><strong>CT Concept<\/strong><\/p>\n<p>Disinfection dose is expressed as concentration multiplied by time:<\/p>\n<ul>\n<li>Higher concentration allows shorter contact time<\/li>\n<li>Lower concentration requires longer contact time<\/li>\n<li>Balance needed between chemical cost and contact time<\/li>\n<\/ul>\n<p><strong>The EPA<\/strong> establishes minimum CT values for specific log inactivation of each pathogen type.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Chlorine_Disinfection\"><\/span>Chlorine Disinfection<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Chemistry_of_Chlorine\"><\/span>Chemistry of Chlorine<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Hypochlorous Acid Formation<\/strong><\/p>\n<p>When chlorine dissolves in water, it forms hypochlorous acid:<\/p>\n<p><strong>Cl\u2082 + H\u2082O \u2192 HOCl + H\u207a + Cl\u207b<\/strong><\/p>\n<p>HOCl dissociates at higher pH:<\/p>\n<p><strong>HOCl \u21cc H\u207a + OCl\u207b<\/strong><\/p>\n<p><strong>Relative Disinfection Power<\/strong><\/p>\n<p>HOCl is approximately <strong>100 times more effective<\/strong> than OCl\u207b at equivalent concentrations due to its uncharged nature, which facilitates cell membrane penetration.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chlorine_Effectiveness_Factors\"><\/span>Chlorine Effectiveness Factors<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>pH Effects<\/strong><\/p>\n<p>pH dramatically affects chlorine disinfection:<\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>pH<\/th>\n<th>HOCl %<\/th>\n<th>OCl\u207b %<\/th>\n<th>Relative Effectiveness<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>6.0<\/td>\n<td>97%<\/td>\n<td>3%<\/td>\n<td>Excellent<\/td>\n<\/tr>\n<tr>\n<td>7.0<\/td>\n<td>72%<\/td>\n<td>28%<\/td>\n<td>Good<\/td>\n<\/tr>\n<tr>\n<td>7.5<\/td>\n<td>50%<\/td>\n<td>50%<\/td>\n<td>Moderate<\/td>\n<\/tr>\n<tr>\n<td>8.0<\/td>\n<td>20%<\/td>\n<td>80%<\/td>\n<td>Reduced<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Temperature Effects<\/strong><\/p>\n<p>Higher temperatures increase reaction rates but decrease residual persistence:<\/p>\n<ul>\n<li><strong>Reaction rate<\/strong>: Doubles for every 10\u00b0C increase<\/li>\n<li><strong>Decay rate<\/strong>: Increases with temperature<\/li>\n<li><strong>Optimal range<\/strong>: 15-25\u00b0C for most applications<\/li>\n<\/ul>\n<p><strong>Ammonia Interactions<\/strong><\/p>\n<p>Ammonia reacts with chlorine to form chloramines:<\/p>\n<ul>\n<li><strong>Monochloramine (NH\u2082Cl)<\/strong>: Primary combined chlorine species<\/li>\n<li><strong>Dichloramine (NHCl\u2082)<\/strong>: Forms at lower pH<\/li>\n<li><strong>Trichloramine (NCl\u2083)<\/strong>: Forms at very low pH; volatile<\/li>\n<\/ul>\n<p><strong>ChiMay&#39;s pH meters<\/strong> provide accurate measurement for optimizing chlorine effectiveness.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chlorine_Byproducts\"><\/span>Chlorine Byproducts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Trihalomethanes (THMs)<\/strong><\/p>\n<p>Formed when chlorine reacts with organic matter:<\/p>\n<ul>\n<li><strong>Chloroform<\/strong>: Potentially carcinogenic<\/li>\n<li><strong>Bromodichloromethane<\/strong>: Regulated at 80 \u03bcg\/L<\/li>\n<li><strong>Dibromochloromethane<\/strong>: Regulated at 80 \u03bcg\/L<\/li>\n<li><strong>Bromoform<\/strong>: Regulated at 80 \u03bcg\/L<\/li>\n<\/ul>\n<p><strong>Haloacetic Acids (HAAs)<\/strong><\/p>\n<p>Second major class of chlorine byproducts:<\/p>\n<ul>\n<li><strong>Monochloroacetic acid<\/strong><\/li>\n<li><strong>Dichloroacetic acid<\/strong><\/li>\n<li><strong>Trichloroacetic acid<\/strong><\/li>\n<li>Regulated at <strong>60 \u03bcg\/L<\/strong> total<\/li>\n<\/ul>\n<p><strong>Managing Byproducts<\/strong><\/p>\n<p>Control strategies include:<\/p>\n<ul>\n<li>Optimize coagulation to remove organic precursors<\/li>\n<li>Consider chloramines for residual maintenance<\/li>\n<li>Use ozone or UV as primary disinfectant<\/li>\n<li>Balance microbial protection with byproduct control<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"UV_Disinfection\"><\/span>UV Disinfection<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Physics_of_UV_Light\"><\/span>Physics of UV Light<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Germicidal Wavelengths<\/strong><\/p>\n<p>UV light at <strong>200-300 nm<\/strong> damages microbial DNA\/RNA:<\/p>\n<ul>\n<li><strong>Peak effectiveness<\/strong>: 253.7 nm<\/li>\n<li><strong>Mechanism<\/strong>: Pyrimidine dimer formation<\/li>\n<li><strong>Effect<\/strong>: Prevents DNA replication<\/li>\n<\/ul>\n<p><strong>Penetration Limitations<\/strong><\/p>\n<p>UV effectiveness depends on water clarity:<\/p>\n<ul>\n<li><strong>High UVT (&gt;85%)<\/strong>: Excellent penetration<\/li>\n<li><strong>Moderate UVT (70-85%)<\/strong>: Good penetration<\/li>\n<li><strong>Low UVT (&lt;70%)<\/strong>: Reduced effectiveness<\/li>\n<li><strong>Turbidity<\/strong>: Shields organisms from UV exposure<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"UV_Dose-Response\"><\/span>UV Dose-Response<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Dose Calculation<\/strong><\/p>\n<p>UV dose = UV intensity \u00d7 exposure time<\/p>\n<p>Units: mW\/cm\u00b2 \u00d7 seconds = mJ\/cm\u00b2<\/p>\n<p><strong>Log Inactivation Requirements<\/strong><\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>Pathogen<\/th>\n<th>Target Log<\/th>\n<th>UV Dose (mJ\/cm\u00b2)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>E. coli<\/td>\n<td>3-log<\/td>\n<td>5.5<\/td>\n<\/tr>\n<tr>\n<td>Rotavirus<\/td>\n<td>3-log<\/td>\n<td>14-24<\/td>\n<\/tr>\n<tr>\n<td>Cryptosporidium<\/td>\n<td>3-log<\/td>\n<td>2.5<\/td>\n<\/tr>\n<tr>\n<td>Giardia<\/td>\n<td>3-log<\/td>\n<td>1.9<\/td>\n<\/tr>\n<tr>\n<td>Adenovirus<\/td>\n<td>3-log<\/td>\n<td>165<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>The EPA<\/strong> requires minimum validation dose of 12 mJ\/cm\u00b2 for bacteria and viruses, with higher doses for protozoa based on treatment objectives.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"UV_System_Components\"><\/span>UV System Components<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Lamp Technologies<\/strong><\/p>\n<p><strong>Low-Pressure Mercury<\/strong><\/p>\n<ul>\n<li>Single wavelength (253.7 nm)<\/li>\n<li>Lower power output<\/li>\n<li>Good efficiency<\/li>\n<li>Standard for most applications<\/li>\n<\/ul>\n<p><strong>Low-Pressure High-Output (LPHO)<\/strong><\/p>\n<ul>\n<li>Enhanced power output<\/li>\n<li>Same wavelength<\/li>\n<li>Higher UV intensity<\/li>\n<li>Reduced reactor size<\/li>\n<\/ul>\n<p><strong>Medium-Pressure Mercury<\/strong><\/p>\n<ul>\n<li>Multiple wavelengths<\/li>\n<li>Higher power<\/li>\n<li>Broader spectrum<\/li>\n<li>Larger reactors<\/li>\n<\/ul>\n<p><strong>Amalgam Lamps<\/strong><\/p>\n<ul>\n<li>Advanced low-pressure design<\/li>\n<li>Higher power density<\/li>\n<li>Longer life<\/li>\n<li>Growing market share<\/li>\n<\/ul>\n<p><strong>Reactor Design<\/strong><\/p>\n<p>Key components include:<\/p>\n<ul>\n<li>Quartz sleeves protecting lamps<\/li>\n<li>Reactors optimized for hydraulic efficiency<\/li>\n<li>UV sensors for monitoring<\/li>\n<li>Cleaning systems for sleeve maintenance<\/li>\n<\/ul>\n<p>Ozone (O\u2083) generated by:<\/p>\n<ul>\n<li><strong>Corona discharge<\/strong>: Most common method<\/li>\n<li><strong>UV radiation<\/strong>: Lower efficiency<\/li>\n<li><strong>Electrochemical<\/strong>: Emerging technology<\/li>\n<\/ul>\n<p><strong>Decomposition<\/strong><\/p>\n<p>Ozone decomposes rapidly in water:<\/p>\n<p><strong>O\u2083 \u2192 O\u2082 + [O] (atomic oxygen)<\/strong><\/p>\n<p>Atomic oxygen reacts with water:<\/p>\n<p><strong>[O] + H\u2082O \u2192 2OH\u2022 (hydroxyl radicals)<\/strong><\/p>\n<p>Hydroxyl radicals are extremely reactive, providing <strong>1,000 times<\/strong> greater oxidation potential than ozone itself.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ozone_Effectiveness\"><\/span>Ozone Effectiveness<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Advantages<\/strong><\/p>\n<ul>\n<li>Most powerful oxidant commonly used in water treatment<\/li>\n<li>Effective against all pathogen types<\/li>\n<li>No persistent residual<\/li>\n<li>Breaks down many organic contaminants<\/li>\n<\/ul>\n<p><strong>Limitations<\/strong><\/p>\n<ul>\n<li>No residual protection in distribution<\/li>\n<li>Rapid decay requires immediate measurement<\/li>\n<li>Bromate formation risk in bromide-containing waters<\/li>\n<li>Higher capital and operating costs<\/li>\n<\/ul>\n<p><strong>ChiMay&#39;s ORP monitors<\/strong> support ozone system optimization by tracking oxidative potential.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ozone_Byproducts\"><\/span>Ozone Byproducts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Bromate Formation<\/strong><\/p>\n<p>Bromide oxidation produces bromate:<\/p>\n<p><strong>Br\u207b \u2192 BrO\u2082\u207b (bromite) \u2192 BrO\u2083\u207b (bromate)<\/strong><\/p>\n<p><strong>Risk Factors<\/strong><\/p>\n<ul>\n<li>High bromide concentration<\/li>\n<li>High ozone dose<\/li>\n<li>High pH<\/li>\n<li>Long contact time<\/li>\n<\/ul>\n<p><strong>Control Strategies<\/strong><\/p>\n<ul>\n<li>Reduce ozone dose<\/li>\n<li>Lower pH during ozonation<\/li>\n<li>Add ammonia to convert bromide to bromamine<\/li>\n<li>Pretreat to remove bromide<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Chloramine_Disinfection\"><\/span>Chloramine Disinfection<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Chloramine_Formation\"><\/span>Chloramine Formation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Chloramines form when chlorine reacts with ammonia:<\/p>\n<p><strong>NH\u2083 + HOCl \u2192 NH\u2082Cl + H\u2082O<\/strong><\/p>\n<p><strong>Species Distribution<\/strong><\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>Species<\/th>\n<th>pH 6-8<\/th>\n<th>pH &lt; 6<\/th>\n<th>pH &gt; 9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Monochloramine<\/td>\n<td>Primary<\/td>\n<td>Secondary<\/td>\n<td>Primary<\/td>\n<\/tr>\n<tr>\n<td>Dichloramine<\/td>\n<td>Secondary<\/td>\n<td>Primary<\/td>\n<td>Trace<\/td>\n<\/tr>\n<tr>\n<td>Trichloramine<\/td>\n<td>Trace<\/td>\n<td>Secondary<\/td>\n<td>None<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways: Water disinfection relies on multiple 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