1.0Brightwork BVhttps://brightwork.nl/nlbwproductshttps://brightwork.nl/nl/author/bwproducts/rich600338<blockquote class="wp-embedded-content" data-secret="KiSoj3KpB5"><a href="https://brightwork.nl/nl/biological-denitrification-2/">Biologische denitrificatie</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://brightwork.nl/nl/biological-denitrification-2/embed/#?secret=KiSoj3KpB5" width="600" height="338" title=""Biologische denitrificatie" - Brightwork BV" data-secret="KiSoj3KpB5" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://brightwork.nl/wp-includes/js/wp-embed.min.js </script>Biological denitrification is used to reduce total nitrogen in both water and waste water. In tertiary waste water applications biological continuous sand filters are used to reduce nitrate nitrogen to levels of 1 – 3 ppm.https://brightwork.nl/wp-content/uploads/2022/04/zand-Picture1.png