{"id":51934,"date":"2021-06-17T08:59:27","date_gmt":"2021-06-17T06:59:27","guid":{"rendered":"https:\/\/www.kwrwater.nl\/actueel\/ro-met-minimale-voorbehandeling-biedt-financiele-ruimte-voor-optimalisatie\/"},"modified":"2021-06-17T09:09:21","modified_gmt":"2021-06-17T07:09:21","slug":"ro-with-minimal-pre-treatment-offers-financial-scope-for-optimisation","status":"publish","type":"post","link":"https:\/\/www.kwrwater.nl\/en\/actueel\/ro-with-minimal-pre-treatment-offers-financial-scope-for-optimisation\/","title":{"rendered":"RO with minimal pre-treatment offers financial scope for optimisation"},"content":{"rendered":"<div class=\"post_intro\">\n<p>Using reverse osmosis (RO) on (drinking) water sources can produce high quality water directly. In practice, however, RO is never used directly on raw water because without (often costly) pre-treatment the membranes quickly foul. The results of <a href=\"https:\/\/www.kwrwater.nl\/en\/projecten\/multi-source-single-stage-full-stream-ro\/\" target=\"_blank\" rel=\"noopener noreferrer\">recent TKI research<\/a> show that fouling of the membranes remains can be controlled even without extensive pretreatment by working at a lower flux, higher cross-flow velocities and improved (periodic) hydraulic cleaning. For this study, a comparison was made between RO on surface water after minimal pre-treatment (screens) or after state-of-the-art ultra-filtration (UF).\u00a0 This showed that both systems do not operate stably in the long term, but both do produce high-quality product water. Because the process with minimal pre-treatment is much cheaper than the process with UF, there is financial scope to make the operation stable after pre-treatment with screens and to optimise it with the aforementioned adjustments in flux, cross-flow speeds and hydraulic cleaning.<\/p>\n<\/div>\n<p>Reducing the membrane flux from 25 L\/m2.h to 10 L\/m2.h slowed down the membrane fouling by about a factor of 10. Periodical air water cleaning in minimal pre-treated RO resulted in an approximately 4-fold reduction of the spacer clogging rate, while not affecting the membrane fouling rate. The total cost of a minimal pre-treated low flux (10 L\/m2.h) operated RO was significantly lower (0.46 \u20ac\/m3) compared to state-of-the-art UF pre-treated RO at normal flux (25 L\/m2.h) (1.21 \u20ac\/m3). The cost difference in financial space provides an opportunity to develop minimal pre-treated RO systems with improved control of membrane fouling and spacer clogging.<\/p>\n<p>Read more in: <em><a href=\"https:\/\/library.kwrwater.nl\/publication\/62706382\/\">Effect of minimal pre-treatment on reverse osmosis using surface water as a source<\/a>, <\/em>E.R.\u00a0Cornelissen, D.J.H.\u00a0Harmsen, B.\u00a0Blankert, L.P.\u00a0Wessels and W.G.J.\u00a0van\u00a0der\u00a0Meer, Desalination, Volume 509, 1 August 2021, 115056.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.kwrwater.nl\/wp-content\/uploads\/2016\/03\/KWR-TKI-OASE-proefopstelling-17-05-2016-029_A5-780x470.jpg\" alt=\"KWR TKI OASE proefopstelling A\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Using reverse osmosis (RO) on (drinking) water sources can produce high quality water directly. In practice, however, RO is never used directly on raw water because without (often costly) pre-treatment the membranes quickly foul. The results of recent&#8230;<\/p>\n","protected":false},"author":6,"featured_media":2081,"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-51934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","gtag-surface-water","gtag-drinking-water-source","gtag-osmosis"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>RO with minimal pre-treatment offers financial scope for optimisation - 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\/ro-with-minimal-pre-treatment-offers-financial-scope-for-optimisation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RO with minimal pre-treatment offers financial scope for optimisation - KWR\" \/>\n<meta property=\"og:description\" content=\"Using reverse osmosis (RO) on (drinking) water sources can produce high quality water directly. In practice, however, RO is never used directly on raw water because without (often costly) pre-treatment the membranes quickly foul. 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