Leveraging proprietary chemistry, this system ensures maximum performance and wet-end compatibility. Stabilized chlorine, a central chemical component, is produced through a tightly controlled Scada-connected feeder system. This setup guarantees consistent production of the desired stabilized chlorine product with independent delivery at the right time and effective levels for selected dosing points. While MCA-based technologies are widely accepted for microbial slime control in papermaking, complementary approaches can address specific papermaker needs. In this article we explore two examples, one in tissue and one in corrugated board. <\/p>\n\n\n\n
Tissue<\/p>\n\n\n\n
Excessive use of halogenated oxidants based on (stabilized) hypochloric acid can lead to increased conductivity in tissue production. This conductivity affects the functionality of additives and may escalate maintenance costs due to enhanced corrosion potential. Additionally, halogenated oxidants contribute to halogenated organic components (AOX), which may exceed discharge limitations in certain regions. <\/p>\n\n\n\n
Some end consumers also demand limitations on AOX in the final tissue products. Nalco Water offers a solution to reduce halogenated oxidants in the tissue process. This approach protects mill assets by minimizing corrosion risk, reducing AOX discharge into the environment and ensuring compliance with Total Chlorine Free production requirements. <\/p>\n\n\n\n
The patented biocontrol method combines Nalco Water\u2019s halogen-free oxidant with a conventional biocide. The relatively new ConnexxTM dosing equipment, adopted from its Ecolab Food & Beverage division, enables chemical and odor-free handling of the oxidant, enhancing safety in the tissue production environment. The Connexx system utilizes an improved formulation of halogen-free oxidant that is non-corrosive and compatible with commonly used tissue additives. <\/p>\n\n\n\n
In a tissue mill, a combination of conventional biocides was used together with stabilized hypochlorite. Due to AOX restrictions in the effluent the stabilized hypochlorite was replaced by the halogen free Connexx technology. AOX levels significantly dropped from an average of 0,446 ppm before the change to 0,154 ppm in the effluent after the change, a more than 65% reduction. In addition, the new program showed a more consistent low AOX level in the effluent, which is relevant as the regulatory limit in the final effluent is 1 ppm. This level was exceeded several times when running the program. <\/p>\n\n\n\n The conductivity was on average reduced with 150 microS\/cm. The use of conventional organic biocides could be reduced with 20%. However, this way of using the Connexx technology does not completely replace the need of conventional biocides in the process. To accommodate this, Nalco Water recently developed the combination of our OxiPRO Q2 technology together with the Connexx technique. This allows for up to 50% reduction of the bleach used in the process versus the use of MCA as the only component without compromising the very effective slime control. <\/p>\n\n\n The biocontrol program on the tissue machine was improved with significant reduced need for halogenated oxidants and without any need for conventional biocides in the tissue production. This approach has also been successfully adopted in folding box board production where full microbial control is essential. By ensuring low bacteria and bacterial spore counts, this sustainable solution maintains process integrity without exceeding chlorine usage limitations. The Connexx system, known for its safe and precise dosing, complements OxiPRO Q2, resulting in optimal microbial management. <\/p>\n\n\n\n Corrugated board<\/p>\n\n\n\n Corrugated board mills face challenges related to raw water availability. Anaerobic bacterial acidification in pulp preparation and backwater processes can significantly impact product quality. The dissolution of calcium carbonate due to high anaerobic microbial activity adversely affects strength properties and necessitates additional additives. <\/p>\n\n\n\n Volatile fatty acids generated due to anaerobic activity can lead to odor complaints and equipment corrosion. Sulphate-reducing bacteria produce toxic and corrosive H2S gas, posing risks to operators and the overall mill environment. A case study involving a paper mill producing various board grades, including core board, highlights the effectiveness of Nalco Water\u2019s approach. Despite conventional organic biocide treatments supplemented with bleach, the paper machine loop suffered from slime infestations. <\/p>\n\n\n\n Bacterial acidification, especially in stock preparation, caused the pH to drop as low as 6.2, affecting additive functionality, such as starch retention during board production. Implementing OxiPRO Q2 resolved these challenges. Microbial deposits were eliminated, reducing hole counts per square meter to virtually zero. Additionally, bacterial acidification was significantly curtailed. The OxiPRO Q2 program was further enhanced by integrating PurateTM technology into stock preparation. Purate, an efficient chlorine dioxide (ClO2) generator, ensures efficient and stable control of bacterial acidification with minimal side reactions. <\/p>\n\n\n\n As a result, pH levels remained consistently above 6.7 across all stock chests. The impact was substantial: production increased by up to 20% in certain grades, COD levels decreased in the effluent, starch retention improved and off-spec paper occurrences significantly diminished. The return on investment for OxiPROQ2 and Purate Technology exceeded 400%. <\/p>\n\n\n\n Digital<\/p>\n\n\n\n In the pursuit of optimal solutions, real-time, 24\/7 monitoring and precise control of oxidant dosing are essential for sustainable and costeffective microbial control programs. <\/p>\n\n\n\n The examples mentioned earlier include and demonstrate the critical role of a Water Quality Monitor in ensuring continuous, round-theclock performance of Nalco Water\u2019s biocontrol program. Parameters such as Oxidation-Reduction Potential (ORP), pH, conductivity and temperature serve as vital indicators, reflecting changes in process conditions and directly impacting biocontrol efficacy. <\/p>\n\n\n\n Leveraging digital<\/strong>: 1. <\/strong>Real-Time Insights: accessible data empowers proactive decision-making. Rapid responses to process variations become possible, maintaining program effectiveness. 2.<\/strong> Automated Control: by integrating real-time data, automated adjustments can be made seamlessly. The dynamic nature of microbial control demands swift adaptations and digital enables precisely that.<\/p>\n\n\n\n Remote management<\/strong>: The suite of oxidant feed equipment – OxiPRO Q2, Connexx and Purate – offers remote control capabilities. Whether adjusting oxidant dosing or finetuning biocontrol strategies, operators can do so from a centralized location.<\/p>\n\n\n\n Holistic approach<\/strong>: Integrating oxidant dosing with the Water Quality Monitor and additional biocontrol monitoring equipment and modules from Nalco Water\u2019s product portfolio ensures a holistic, data-driven approach. Real-time insights drive automated biocontrol decisions, optimizing performance.In summary, digitalization transforms microbial control from reactive to proactive, ensuring consistent excellence in water treatment processes.<\/p>\n","protected":false},"excerpt":{"rendered":" The regulatory landscape in Europe is rapidly changing, leading to a reevaluation of biocides permitted for use in the papermaking process. Traditional organic biocides face potential substitution due to safety, health and environmental considerations. Simultaneously, the adoption of oxidizing biocontrol agents is steadily increasing. Across various paper grades – graphics, tissue & towel, board & … Continued<\/a><\/p>\n","protected":false},"author":2,"featured_media":7662,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[155],"tags":[93],"class_list":["post-7657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novembre-dicembre-2024","tag-chemicals"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/posts\/7657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/comments?post=7657"}],"version-history":[{"count":3,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/posts\/7657\/revisions"}],"predecessor-version":[{"id":8294,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/posts\/7657\/revisions\/8294"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/media\/7662"}],"wp:attachment":[{"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/media?parent=7657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/categories?post=7657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cartaecartiere.com\/en\/wp-json\/wp\/v2\/tags?post=7657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.cartaecartiere.com\/wp-content\/uploads\/2024\/12\/CC-IMMAGINI-26.jpg\")
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