{"id":61927,"date":"2022-03-10T09:52:13","date_gmt":"2022-03-10T08:52:13","guid":{"rendered":"https:\/\/www.kwrwater.nl\/actueel\/onderzoek-naar-de-microbiologische-effecten-van-thermische-energie-uit-drinkwater-op-de-waterkwaliteit\/"},"modified":"2022-03-15T16:27:45","modified_gmt":"2022-03-15T15:27:45","slug":"research-on-the-microbial-effects-of-thermal-energy-from-drinking-water-on-water-quality","status":"publish","type":"post","link":"https:\/\/www.kwrwater.nl\/en\/actueel\/research-on-the-microbial-effects-of-thermal-energy-from-drinking-water-on-water-quality\/","title":{"rendered":"Research on the microbial effects of \u2018thermal energy from drinking water\u2019 on water quality"},"content":{"rendered":"<div class=\"post_intro\">\n<p>The demand for thermal energy from drinking water (TED) is increasing with the growing urgency of the energy transition. Drinking water utilities want to know whether, and under what conditions, the supplying of heat or cold from the drinking water network is safe. Using a unique test installation at PWN, this drinking water utility and KWR are conducting joint pilot research into this question in the framework of the Aquathermia theme within the WarmingUp research collective.<\/p>\n<\/div>\n<p>In the Climate Agreement the Dutch government made commitments on the reduction of the emission of CO<sub>2<\/sub>. These commitments are being carried out in the energy transition and, in view of the transition\u2019s urgency, every available sustainable source of heating and cooling capacity needs to be considered. The drinking water utilities are therefore also being increasingly approached and asked whether they want to offer heating and cooling capacity from their water infrastructure: \u2018Thermal Energy from Drinking Water\u2019 (TED). This explains the importance of knowing more about the effects TED has on drinking water quality.<\/p>\n<div class=\"wp-caption aligncenter\" style=\"width: 500px\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.kwrwater.nl\/wp-content\/uploads\/2022\/03\/Afbeelding1-002.jpg\" alt=\"\" width=\"500\" height=\"331\" \/><p class=\"wp-caption-text\">The container with the test installation, consisting of five flow cells, to study the effects of TED.<\/p><\/div>\n<p>Aquathermia or TED is not a new technology. It has already been in use in the Netherlands for about 18 years, including for collective heat supply, as in the case of the <a href=\"https:\/\/www.thermobello.nl\/\">EVA-Lanxmeer<\/a> district in Culemborg. When TED is used for heat recovery, the drinking water cools down. Depending on the situation, TED can also be a source of sustainable cold, in which case the drinking water warms up. An example of this is the existing TED system at Sanquin in Amsterdam (Waternet). Here, during the winter season cold is \u2018extracted\u2019 and stored in a geothermal energy system and then used for cooling in the summer. Our current knowledge is not adequate to determine the temperature to which drinking water can be warmed up in TED applications without endangering drinking water safety.<\/p>\n<h2>Existing research gives limited picture<\/h2>\n<p>Earlier research showed that TED can be safely implemented \u2013 thus without risks to drinking water safety \u2013 when certain conditions are met, such as the use of certified materials, application of double-walled heat exchangers, and operation up to the relatively low temperature of 15 \u00b0C. In the \u2018Elaboration of heat-cold recovery from drinking water\u2019 <a href=\"https:\/\/www.kwrwater.nl\/projecten\/verdieping-warmte-en-koude-uit-drinkwater-wkd\/\">\u00a0(WKD) project<\/a>, within the Joint Research Programme with the water utilities in 2013-2017, KWR carried out microbiological research into the effects of TED. TU Delft and Waternet also researched TED and published their findings in 2020. But none of this research offers a full answer to these two questions:<\/p>\n<ol>\n<li>What is the temperature limit to which the drinking water can be warmed up in the winter for the recovery of cold capacity?<\/li>\n<li>Can a TED heat exchanger be safely installed for heat recovery at a location where the drinking water in the pipe network in the summer becomes relatively warm?<\/li>\n<\/ol>\n<h2>Unique test installation<\/h2>\n<p>In the Aquathermia theme within the <a href=\"http:\/\/www.warmingup.info\">WarmingUP<\/a> research collective, KWR is therefore now investigating the effects of TED. Drinking water utility PWN has made a site available for a test installation. Drinking water is taken at the site from a PWN transport main and collected in a separate system via a \u2018break tank\u2019, so that there is no risk of an exchange of substances with the PWN drinking water. The test installation offers the possibility of studying the conditions (i.e., the temperature of the water or of the heat exchanger) under which microorganisms can develop in the biofilm on the RVS and EPDM in a heat exchanger.<\/p>\n<p>In the test installation the water is run through \u2018flow cells\u2019. These cells replicate conditions that also apply in the heat exchanger. The incoming and outgoing temperatures of the pilot water can be adjusted to test different temperature scenarios in practice. The installation also allows for the testing of different materials.<\/p>\n<div class=\"wp-caption aligncenter\" style=\"width: 500px\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.kwrwater.nl\/wp-content\/uploads\/2022\/03\/Afbeelding2-002.jpg\" alt=\"\" width=\"500\" height=\"375\" \/><p class=\"wp-caption-text\">One of the five \u2018flow cells\u2019 in which water flows and is warmed up. Small sheets of RVS and EPDM are placed in the flow cell to study biofilm formation.<\/p><\/div>\n<h2>Applying results<\/h2>\n<p>The researchers want to learn more about what is and what is not possible with TED from the results of the research, which are expected over the course of 2022. They want to be in a position to make recommendations about how TED can best be implemented to contribute to the energy transition without impairing the quality of drinking water. The test installation at PWN now simulates a situation with cold recovery in the winter, and is set up in such a way that it is also expected to reveal the extent to which the application of TED at locations with (overly) warm drinking water in the summer could lead to undesirable growth of microorganisms in the heat exchanger.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How can it be possible to extract heat and cold from the drinking water network without adverse (microbiological) effects on drinking water quality? A unique pilot study by KWR and PWN within the WarmingUP research collective is intended to answer this question.<\/p>\n","protected":false},"author":6,"featured_media":61657,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-61927","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","gtag-heat","gtag-water-quality","gtag-field-test","gtag-thermal-energy-from-water"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Research on the microbial effects of \u2018thermal energy from drinking water\u2019 on water quality - KWR<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kwrwater.nl\/en\/actueel\/research-on-the-microbial-effects-of-thermal-energy-from-drinking-water-on-water-quality\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Research on the microbial effects of \u2018thermal energy from drinking water\u2019 on water quality - KWR\" \/>\n<meta property=\"og:description\" content=\"How can it be possible to extract heat and cold from the drinking water network without adverse (microbiological) effects on drinking water quality? 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