{"id":4351,"date":"2026-09-05T09:33:07","date_gmt":"2026-09-05T01:33:07","guid":{"rendered":"https:\/\/jxhg.net\/"},"modified":"2026-09-05T09:33:09","modified_gmt":"2026-09-05T01:33:09","slug":"how-to-choose-polyacrylamide-for-water-treatment-apam-cpam-and-npam-explained","status":"publish","type":"post","link":"https:\/\/jxhg.net\/zh\/blog\/how-to-choose-polyacrylamide-for-water-treatment-apam-cpam-and-npam-explained\/","title":{"rendered":"How to Choose Polyacrylamide for Water Treatment: APAM, CPAM and NPAM Explained"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>Polyacrylamide, commonly known as PAM<\/strong>, is a high-molecular-weight polymer widely used as a flocculant in industrial wastewater treatment and sludge dewatering.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It helps suspended solids, colloidal particles and fine impurities aggregate into larger flocs, improving sedimentation, flotation, filtration and sludge dewatering efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, wastewater characteristics vary significantly depending on the industry, raw materials and treatment processes. Differences in particle charge, pH, organic content and suspended solids can directly affect PAM performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing the wrong grade may result in small flocs, slow settling, cloudy effluent, high sludge moisture or excessive chemical consumption. Therefore, it is important to select the correct anionic, cationic or nonionic polyacrylamide according to the actual wastewater conditions.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does Polyacrylamide Do in Water Treatment?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Polyacrylamide mainly works through adsorption bridging, charge neutralization and flocculation. It connects fine particles that cannot settle naturally and forms larger, stronger flocs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its main functions include:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Accelerating the sedimentation of suspended solids;<\/li>\n\n\n\n<li>Improving solid-liquid separation efficiency;<\/li>\n\n\n\n<li>Enhancing sludge dewatering performance;<\/li>\n\n\n\n<li>Reducing suspended solids in treated water;<\/li>\n\n\n\n<li>Improving the efficiency of sedimentation tanks, flotation systems and filter presses;<\/li>\n\n\n\n<li>Reducing sludge volume and overall treatment costs.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Polyacrylamide is frequently used together with polyaluminium chloride (PAC). PAC mainly destabilizes and coagulates suspended particles, while PAM connects these particles into larger flocs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the dosage and feeding sequence are properly controlled, the combined use of PAC and PAM can improve treatment performance and reduce overall chemical consumption.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9634\u79bb\u5b50\u805a\u4e19\u70ef\u9170\u80fa\uff08APAM\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Anionic polyacrylamide, or APAM, is generally suitable for treating inorganic wastewater and suspended particles with positive surface charges.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typical Applications of APAM<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mining and mineral-processing wastewater;<\/li>\n\n\n\n<li>Coal-washing wastewater and coal-slurry settling;<\/li>\n\n\n\n<li>Sand-washing wastewater;<\/li>\n\n\n\n<li>Steel plant wastewater;<\/li>\n\n\n\n<li>Metallurgical wastewater;<\/li>\n\n\n\n<li>Construction slurry treatment;<\/li>\n\n\n\n<li>Paper-making wastewater;<\/li>\n\n\n\n<li>Certain oilfield wastewater applications;<\/li>\n\n\n\n<li>Wastewater clarification and sedimentation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">APAM generally provides a high molecular weight, rapid floc formation and efficient sedimentation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Puyang Jinxiang Chemical Co., Ltd. supplies APAM in different molecular weights and degrees of hydrolysis. Common molecular weights range from approximately 12 million to 23 million.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, a higher molecular weight does not always provide better results. An excessively high molecular weight may increase solution viscosity, make dissolution more difficult and raise chemical consumption. The correct grade should be selected through wastewater sample testing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9633\u79bb\u5b50\u805a\u4e19\u70ef\u9170\u80fa\uff08CPAM\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cationic polyacrylamide, or CPAM, is mainly used for wastewater and sludge containing high levels of organic matter. It is particularly suitable for sludge dewatering applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typical Applications of CPAM<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Municipal sewage sludge dewatering;<\/li>\n\n\n\n<li>Domestic wastewater treatment;<\/li>\n\n\n\n<li>Food-processing wastewater;<\/li>\n\n\n\n<li>Slaughterhouse wastewater;<\/li>\n\n\n\n<li>Livestock and farming wastewater;<\/li>\n\n\n\n<li>Textile dyeing wastewater;<\/li>\n\n\n\n<li>Paper-mill sludge dewatering;<\/li>\n\n\n\n<li>Pharmaceutical and fermentation wastewater;<\/li>\n\n\n\n<li>Leather-processing wastewater;<\/li>\n\n\n\n<li>Belt filter presses, plate-and-frame filter presses and centrifuges.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The cationic degree is an important factor when selecting CPAM. Different sludge compositions, organic matter contents, surface charges and dewatering equipment require different cationic grades.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common cationic degrees range from approximately 30% to 80%. Sludge containing high levels of organic matter may require medium- or high-cationic products. However, the final grade and dosage should always be confirmed through laboratory testing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u975e\u79bb\u5b50\u805a\u4e19\u70ef\u9170\u80fa\uff08NPAM\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nonionic polyacrylamide, or NPAM, has a relatively low ionic charge and is commonly used in acidic wastewater or treatment systems that are sensitive to charge conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typical Applications of NPAM<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Acidic industrial wastewater;<\/li>\n\n\n\n<li>Textile and dyeing wastewater;<\/li>\n\n\n\n<li>Mineral processing;<\/li>\n\n\n\n<li>Metallurgical wastewater;<\/li>\n\n\n\n<li>Certain chemical-industry wastewater;<\/li>\n\n\n\n<li>Soil water retention and industrial thickening.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The common molecular-weight range of NPAM is approximately 5 million to 14 million.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under acidic or chemically complex conditions, NPAM may provide more stable treatment performance than some anionic grades. However, its application range is relatively specialized, so selection should be based on wastewater characteristics and treatment requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Are the Differences Between APAM, CPAM and NPAM?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4ea7\u54c1<\/th><th>Abbreviation<\/th><th>Main Characteristics<\/th><th>Typical Applications<\/th><\/tr><\/thead><tbody><tr><td>Anionic polyacrylamide<\/td><td>APAM<\/td><td>High molecular weight with excellent flocculation and sedimentation performance<\/td><td>Coal washing, mining, sand washing, steel production and paper-making wastewater<\/td><\/tr><tr><td>Cationic polyacrylamide<\/td><td>CPAM<\/td><td>Strong charge-neutralization performance and suitable for organic sludge<\/td><td>Municipal sludge, food processing, slaughterhouse, textile and paper-mill sludge dewatering<\/td><\/tr><tr><td>Nonionic polyacrylamide<\/td><td>NPAM<\/td><td>Low ionic charge and suitable for certain acidic systems<\/td><td>Acidic wastewater, mining, textile and chemical wastewater<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These three types of polyacrylamide cannot simply replace one another.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even within the same industry, wastewater composition and treatment equipment can vary considerably between plants. Therefore, the most suitable PAM type, molecular weight, ionic degree and dosage may also be different.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5982\u4f55\u9009\u62e9\u5408\u9002\u7684\u805a\u4e19\u70ef\u9170\u80fa<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Identify the Wastewater Source<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First, determine whether the wastewater comes from coal washing, mining, paper production, textile dyeing, food processing, municipal sewage or another industrial process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The wastewater source provides an initial indication of whether APAM, CPAM or NPAM should be tested.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Confirm the Treatment Objective<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Different treatment stages may require different products:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For sedimentation and clarification, APAM is usually tested first;<\/li>\n\n\n\n<li>For sludge dewatering, CPAM is generally the preferred starting point;<\/li>\n\n\n\n<li>For acidic or special wastewater, NPAM may be considered;<\/li>\n\n\n\n<li>When PAM is used with PAC, the dosage and feeding sequence of both chemicals must be optimized.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Evaluate the pH and Particle Charge<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Wastewater pH, suspended-solids concentration, organic content and particle surface charge can all affect flocculation performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selecting a product only according to molecular weight or ionic degree is usually insufficient to guarantee the best result.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Conduct Jar Tests<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Jar testing is one of the most important steps in PAM selection. Different product grades and dosages should be compared by observing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Floc formation speed;<\/li>\n\n\n\n<li>Floc size and strength;<\/li>\n\n\n\n<li>Sedimentation speed;<\/li>\n\n\n\n<li>Clarity of the supernatant;<\/li>\n\n\n\n<li>Sludge volume;<\/li>\n\n\n\n<li>Moisture content of the dewatered sludge cake.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These results help determine both the most suitable product and the most economical dosage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Use Polyacrylamide Correctly<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Solution Concentration<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Polyacrylamide powder should normally be dissolved and diluted before use. A solution concentration of approximately 0.1% to 0.3% is commonly used, although the actual concentration should be adjusted according to the dosing system and treatment process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Preparation Method<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Add the PAM powder slowly and evenly into clean water while stirring. Do not add a large amount at once, as this can cause agglomeration and the formation of undissolved lumps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Room-temperature clean water is generally recommended for solution preparation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dissolution Time<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Polyacrylamide must be completely dissolved and matured before use. Most products require approximately 40 to 60 minutes, depending on the grade, water temperature, stirring speed and solution concentration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stirring Requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Excessively high stirring speeds should be avoided. Strong mechanical shear can damage the polymer chains and reduce flocculation performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prepared PAM solutions should also not be circulated for extended periods through high-speed centrifugal pumps.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dosage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The correct PAM dosage should be established through testing. Insufficient dosage may cause incomplete flocculation, while excessive dosage may make the treated water cloudy again and increase operating costs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Problems When Using Polyacrylamide<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">The Flocs Are Too Small<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Possible causes include an unsuitable PAM grade, insufficient dosage, incomplete dissolution or an inappropriate wastewater pH.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Flocs Break Easily<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This may be caused by excessive stirring, high shear forces during pumping, or an unsuitable molecular weight or ionic degree.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Treated Water Remains Cloudy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check the PAC and PAM feeding sequence, chemical dosage, wastewater pH and available flocculation time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The PAM Solution Contains Lumps<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This usually occurs when the powder is added too quickly or concentrated in one area. PAM should be slowly and evenly dispersed into the water under controlled stirring.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5305\u88c5\u4e0e\u50a8\u5b58<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Polyacrylamide powder is commonly packed in 25 kg bags with an inner moisture-resistant plastic liner and a durable outer bag.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The product should be stored in a dry, cool and well-ventilated area. Protect it from moisture, direct sunlight and packaging damage. Opened bags should be tightly sealed to prevent moisture absorption and agglomeration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Professional Polyacrylamide Selection and Supply<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Puyang Jinxiang Chemical Co., Ltd. specializes in the development, manufacturing and supply of water-treatment and oilfield chemicals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our product range and services include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/jxhg.net\/zh\/product\/anionic-polyacrylamide-apam\/\">Anionic polyacrylamide (APAM);<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/jxhg.net\/zh\/product\/cationic-polyacrylamide-cpam\/\">Cationic polyacrylamide (CPAM);<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/jxhg.net\/zh\/product\/nonionic-polyacrylamide-npam\/\">Nonionic polyacrylamide (NPAM);<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/jxhg.net\/zh\/product\/polyaluminium-chloride\/\">Polyaluminium chloride (PAC);<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/jxhg.net\/zh\/product\/silicone-defoamer\/\">Silicone defoamers;<\/a><\/li>\n\n\n\n<li>Product-selection guidance;<\/li>\n\n\n\n<li>Wastewater sample testing and dosage recommendations;<\/li>\n\n\n\n<li>OEM packaging and international export services.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you are treating coal-washing wastewater, mining wastewater, paper-making wastewater, textile wastewater, municipal sludge or other industrial wastewater, please provide the wastewater source, treatment process, pH value, daily treatment capacity and current chemical dosage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our technical team can recommend a suitable polyacrylamide grade and support sample testing to help improve solid-liquid separation efficiency and reduce overall chemical costs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/jxhg.net\/zh\/\">\u6fee\u9633\u91d1\u7fd4\u5316\u5de5\u6709\u9650\u516c\u53f8.<\/a><\/strong><br><strong>Website: <a href=\"https:\/\/jxhg.net\/zh\/\">www.jxhg.net<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Polyacrylamide, commonly known as PAM, is a high-molecular-weight polymer widely used as a flocculant in industrial wastewater treatment and sludge dewatering. It helps suspended solids, colloidal particles and fine impurities aggregate into larger flocs, improving sedimentation, flotation, filtration and sludge dewatering efficiency. However, wastewater characteristics vary significantly depending on the industry, raw materials and treatment [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_focuskw":"","rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"Polyacrylamide for water treatment,Differences between APAM,CPAM,and NPAM","_aioseop_title":"","_aioseop_description":"","footnotes":""},"categories":[32],"tags":[],"class_list":["post-4351","post","type-post","status-publish","format-standard","hentry","category-application-of-wastewater-treatment-agents"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/posts\/4351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/comments?post=4351"}],"version-history":[{"count":1,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/posts\/4351\/revisions"}],"predecessor-version":[{"id":4354,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/posts\/4351\/revisions\/4354"}],"wp:attachment":[{"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/media?parent=4351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/categories?post=4351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jxhg.net\/zh\/wp-json\/wp\/v2\/tags?post=4351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}