{"id":2225,"date":"2025-11-24T15:17:40","date_gmt":"2025-11-24T13:17:40","guid":{"rendered":"https:\/\/kotekservice.com\/?page_id=2225"},"modified":"2025-11-25T13:17:15","modified_gmt":"2025-11-25T11:17:15","slug":"waste-water-treatment-plants","status":"publish","type":"page","link":"https:\/\/kotekservice.com\/en\/services\/waste-water-treatment-plants\/","title":{"rendered":"Waste water treatment plants"},"content":{"rendered":"\t\t
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Home page<\/a><\/div>\n\t\t<\/div>\n\t\t<\/div>\n\t\t<\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Waste water basin stresses and Kotek Factory Service Oy's comprehensive service<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Waste water tanks are one of the most demanding structures in industry and municipal engineering. Their conditions put concrete and coatings under a variety of stresses – simultaneously and continuously. The combined effect of these factors places a very heavy life-cycle load on the structure, requiring both the right working methods and the right coating system. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Chemical stress<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Wastewater is not just water, it contains:<\/p>

  • acidic and basic compounds<\/li>
  • sulphates, chlorides and heavy metals<\/li>
  • organic acids and decomposing compounds<\/li>
  • detergents and process chemicals<\/li><\/ul>

    In particular, microbial corrosion (MIC) caused by hydrogen sulphide (H\u2082S)<\/strong> is a rapid and severe mechanism of destruction of concrete and metal reinforcement. In pools, H\u2082S is converted by bacteria into sulphuric acid – which corrodes concrete faster than most industrial chemicals. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Microbiological load<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    The heat, humidity and organic material in waste water basins create the perfect conditions for microbial growth.
    Concrete is exposed:<\/p>

    • sulphur-forming bacteria<\/li>
    • for algal, mould and bacterial membranes<\/li>
    • for biological precipitates<\/li><\/ul>

      These accelerate chemical deterioration and weaken the adhesion of coatings unless the surface is professionally cleaned and roughened.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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      Mechanical consumption<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      Pool coatings and concrete structures have to withstand:<\/p>

      • erosion by flowing water<\/li>
      • the abrasive effect of pumped sludge and sand<\/li>
      • vibration of equipment in wastewater processes<\/li>
      • mechanical shocks (metal objects, cleaning tools)<\/li><\/ul>

        Over time, wear will deteriorate both the concrete surface and the previous coating – especially if the substrate has not been properly roughened before coating.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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        Temperature fluctuations, freezing and thawing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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        In the Finnish climate, outdoor waste water basins are vulnerable:<\/p>

        • for frost<\/li>
        • for meltwater<\/li>
        • to the expansion of freezing water<\/li>
        • for routing<\/li><\/ul>

          Moisture is absorbed into the concrete and expands as it freezes, causing:<\/p>

          • concrete crumbles<\/li>
          • cracks are growing<\/li>
          • the coating loses its adhesion<\/li>
          • the reinforcement is exposed to corrosion<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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            Concrete deterioration and corrosion of reinforcement<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            When concrete loses its compactness:<\/p>

            • chlorides and sulphates penetrate deeper<\/li>
            • the reinforcement starts to rust<\/li>
            • rusting expands the reinforcement<\/li>
            • expansion breaks the concrete from the inside<\/li>
            • increasing cracks and chipping<\/li><\/ul>

              This leads to rapid deterioration of the structure and even environmental risks if leaks occur.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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              Kotek Factory Service Oy provides a full service for the rehabilitation of wastewater ponds<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              Kotek’s strength is that the entire process is done in-house – from substrate cleaning to the final coating.
              This is critical, as the coating of wastewater ponds will always fail if any step is skipped or done using the wrong methods.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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              1. Water pickling or high-pressure washing<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              The substrate is cleaned with high pressure (2500-3000 bar) or water pickling (2000-2500 bar, with material removal), whereby:<\/p>

              • weak concrete is eliminated<\/li>
              • microbial and chemical residues are shed<\/li>
              • better adhesion of the coating<\/li>
              • errors and damage become visible<\/li><\/ul>

                This is the only proper way to clean wastewater basins – sandblasting is not enough for deeply absorbed residues.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                2. Levelling and repair work<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                Weak parts of the concrete surface are levelled:<\/p>

                • with epoxy coatings<\/li>
                • with cement-based repair mixes<\/li>
                • if necessary, the reinforcement is repaired<\/li><\/ul>

                  The aim is to achieve a dense and uniform surface with maximum adhesion of the coating.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                  3. Chemically resistant coating<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  Kotek uses suitable coating systems.<\/p>

                  The most common coatings for waste water tanks:<\/p>

                  • Polyurea<\/strong> – seamless, highly chemical resistant, fast curing<\/li>
                  • ARC CS4(E)<\/strong> – strong novolac epoxy, resistant to MIC corrosion<\/li>
                  • ARC 988(E)<\/strong> – strong abrasive mass for harsh chemicals and abrasion<\/li>
                  • Epoxy coatings<\/strong> – resistant to chemicals and mechanical stress<\/li>
                  • Polyurethane coatings<\/strong> – flexible and wear-resistant<\/li><\/ul>

                    The coating is selected based on the chemical stresses, temperature and mechanical wear of the pool.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                    4. The result: a leak-proof, safe and long-lasting pool<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                    When all the steps are done correctly:<\/p>

                    • the risk of leakage is eliminated<\/li>
                    • extending the life of the structure by years<\/li>
                    • improved chemical resistance<\/li>
                    • increased process safety<\/li>
                    • environmental risk is significantly reduced<\/li><\/ul>

                      Kotek Factory Service Oy’s one-stop service ensures that all stages are handled by a single operator – without any middlemen and without the risk of missing steps.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                      Waste water basin stresses and Kotek Factory Service Oy’s comprehensive service Waste water tanks are one of the most demanding structures in industry and municipal engineering. Their conditions put concrete and coatings under a variety of stresses – simultaneously and continuously. The combined effect of these factors places a very heavy life-cycle load on the […]<\/p>\n","protected":false},"author":1,"featured_media":1446,"parent":1505,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2225","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/pages\/2225","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/comments?post=2225"}],"version-history":[{"count":13,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/pages\/2225\/revisions"}],"predecessor-version":[{"id":2274,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/pages\/2225\/revisions\/2274"}],"up":[{"embeddable":true,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/pages\/1505"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/media\/1446"}],"wp:attachment":[{"href":"https:\/\/kotekservice.com\/en\/wp-json\/wp\/v2\/media?parent=2225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}