{"id":1304,"date":"2020-09-09T15:27:40","date_gmt":"2020-09-09T12:27:40","guid":{"rendered":"https:\/\/strongflow.fi\/raakaveden-kasittely-vesilaitoksilla"},"modified":"2021-01-18T15:07:53","modified_gmt":"2021-01-18T13:07:53","slug":"ravattenbehandling-vid-vattenverk","status":"publish","type":"page","link":"https:\/\/strongflow.fi\/sv\/ravattenbehandling-vid-vattenverk","title":{"rendered":"R\u00e5vattenbehandling vid vattenverk"},"content":{"rendered":"[vc_row type=&#8221;full_width_background&#8221; full_screen_row_position=&#8221;middle&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; bg_image=&#8221;203&#8243; bg_position=&#8221;center center&#8221; bg_repeat=&#8221;no-repeat&#8221; scene_position=&#8221;center&#8221; top_padding=&#8221;10%&#8221; bottom_padding=&#8221;10%&#8221; text_color=&#8221;dark&#8221; text_align=&#8221;left&#8221; row_border_radius=&#8221;none&#8221; row_border_radius_applies=&#8221;bg&#8221; enable_gradient=&#8221;true&#8221; color_overlay=&#8221;#000000&#8243; overlay_strength=&#8221;0.8&#8243; gradient_direction=&#8221;left_to_right&#8221; shape_divider_position=&#8221;bottom&#8221; bg_image_animation=&#8221;none&#8221; shape_type=&#8221;&#8221;][vc_column column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/1&#8243; tablet_width_inherit=&#8221;default&#8221; tablet_text_alignment=&#8221;default&#8221; phone_text_alignment=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][vc_custom_heading text=&#8221;R\u00e5vattenbehandling vid vattenverk&#8221; font_container=&#8221;tag:h1|text_align:left|color:%23ffffff&#8221; use_theme_fonts=&#8221;yes&#8221;][\/vc_column][\/vc_row][vc_row type=&#8221;full_width_content&#8221; full_screen_row_position=&#8221;middle&#8221; column_margin=&#8221;default&#8221; equal_height=&#8221;yes&#8221; content_placement=&#8221;top&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; scene_position=&#8221;center&#8221; bottom_padding=&#8221;0&#8243; text_color=&#8221;dark&#8221; text_align=&#8221;left&#8221; row_border_radius=&#8221;none&#8221; row_border_radius_applies=&#8221;bg&#8221; overlay_strength=&#8221;0.3&#8243; gradient_direction=&#8221;left_to_right&#8221; shape_divider_position=&#8221;bottom&#8221; bg_image_animation=&#8221;none&#8221; shape_type=&#8221;&#8221;][vc_column column_padding=&#8221;padding-10-percent&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;2\/3&#8243; tablet_width_inherit=&#8221;default&#8221; tablet_text_alignment=&#8221;default&#8221; phone_text_alignment=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][vc_column_text]Kvalitetsfel \u00e4r vanligt f\u00f6rekommande i vatten fr\u00e5n borrbrunnar och andra r\u00e5vattenk\u00e4llor, och m\u00e5ste avl\u00e4gsnas innan vattnet anv\u00e4nds i hush\u00e5llen eller i industriella processer.<\/p>\n<p>De vanligaste problemen i r\u00e5vatten i Sverige r\u00f6r fluorid, klorid, arsenik, j\u00e4rn och mangan. Dessutom kan humus och andra organiska \u00e4mnen f\u00f6rekomma i ytvatten.<\/p>\n<p>F\u00f6r dimensionering och planering av vattenbehandlingsanl\u00e4ggningen beh\u00f6vs en vattenanalys och uppgifter om vilken kapacitet\/fl\u00f6deshastighet som kr\u00e4vs. Om anl\u00e4ggningen ska monteras i ett befintligt utrymme har vi ocks\u00e5 nytta av uppgifter om rummets m\u00e5tt och tillg\u00e4ngliga avlopp.<\/p>\n<p><strong>Fluorid, klorid och arsenik <\/strong><\/p>\n<p>Fluorid, klorid och arsenik i r\u00e5vatten kan orsaka h\u00e4lsoproblem om riktv\u00e4rdena \u00f6verskrids. F\u00f6r att avl\u00e4gsna dessa orenheter anv\u00e4nds vanligen membranteknik, d\u00e4r vattnet filtreras med tryck genom ett halvgenomsl\u00e4ppligt membran. Till\u00e4mpningar av membranteknik delas vanligen in i nano- och ultrafiltrering samt omv\u00e4nd osmos. Det som skiljer dessa metoder \u00e5t \u00e4r fr\u00e4mst membranens genomsl\u00e4pplighet. Vatten som behandlas med membranteknik delas alltid upp i permeat (filtrerat produktvatten) och koncentrat (processens spillvatten d\u00e4r de skadliga \u00e4mnena ing\u00e5r). F\u00f6rh\u00e5llandet mellan permeat och koncentrat varierar s\u00e5 att vattenutbytet i typfallet \u00e4r 70\u201380\u00a0%.<\/p>\n<p>Nanofiltrering \u00e4r en till\u00e4mpning av membranteknik, och anv\u00e4nds exempelvis vid dricksvattenproduktion och i industriella processer f\u00f6r att avl\u00e4gsna bland annat arsenik. Nanofiltrering avl\u00e4gsnar ocks\u00e5 h\u00e5rdhetsbildande salter ur vattnet, det vill s\u00e4ga g\u00f6r vattnet mjukare.<\/p>\n<p>P\u00e5 motsvarande s\u00e4tt \u00e4r omv\u00e4nd osmos en till\u00e4mpning av membranteknik, d\u00e4r vatten filtreras genom ett halvgenomsl\u00e4ppligt membran med hj\u00e4lp av ett tryck som \u00f6verstiger det osmotiska trycket hos det vatten som genomg\u00e5r processen. Typiska anv\u00e4ndnings\u00e4ndam\u00e5l f\u00f6r omv\u00e4nd osmos vid behandling av grundvatten \u00e4r avl\u00e4gsnande av fluorid och klorid. Omv\u00e4nd osmos kan avl\u00e4gsna 97\u201399,5\u00a0% av de salter som \u00e4r uppl\u00f6sta i vattnet, men av exempelvis fluorid och klorid avl\u00e4gsnas vanligen endast den m\u00e4ngd som riktv\u00e4rdena kr\u00e4ver (d\u00e5 leds endast en del av den totala vattenm\u00e4ngden till anl\u00e4ggningen f\u00f6r omv\u00e4nd osmos).<\/p>\n<p>En anl\u00e4ggning f\u00f6r membranfiltrering best\u00e5r n\u00e5got f\u00f6renklat av f\u00f6rfilter (fastst\u00e4lls enligt vattnets kvalitet), en h\u00f6gtryckspump samt de membran som anv\u00e4nds f\u00f6r filtrering.<\/p>\n<p>&nbsp;<\/p>\n<table width=\"604\">\n<tbody>\n<tr>\n<td width=\"330\">Nanofiltrering och fl\u00f6deshastighet hos anl\u00e4ggning f\u00f6r omv\u00e4nd osmos<\/td>\n<td width=\"274\">Anl\u00e4ggningens uppskattade storlek (L\u00a0x\u00a0B\u00a0x\u00a0H) [m]<\/td>\n<\/tr>\n<tr>\n<td width=\"330\">8m3\/h<\/td>\n<td width=\"274\">3.5 x 1.5 x 2<\/td>\n<\/tr>\n<tr>\n<td width=\"330\">20m3\/h<\/td>\n<td width=\"274\">3.5 x 1.5 x 2<\/td>\n<\/tr>\n<tr>\n<td width=\"330\">50m3\/h<\/td>\n<td width=\"274\">5.5 x 2 x 2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n[\/vc_column_text][vc_row_inner equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; top_padding=&#8221;3%&#8221; text_align=&#8221;left&#8221;][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/3&#8243; tablet_width_inherit=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][image_with_animation image_url=&#8221;1212&#8243; animation=&#8221;None&#8221; hover_animation=&#8221;color-overlay&#8221; alignment=&#8221;&#8221; img_link_large=&#8221;yes&#8221; border_radius=&#8221;3px&#8221; box_shadow=&#8221;none&#8221; image_loading=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_width_mobile=&#8221;default&#8221;][\/vc_column_inner][vc_column_inner column_padding=&#8221;padding-3-percent&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;2\/3&#8243; tablet_width_inherit=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][image_with_animation image_url=&#8221;1214&#8243; animation=&#8221;None&#8221; hover_animation=&#8221;none&#8221; alignment=&#8221;&#8221; img_link_large=&#8221;yes&#8221; border_radius=&#8221;3px&#8221; box_shadow=&#8221;none&#8221; image_loading=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_width_mobile=&#8221;default&#8221;][\/vc_column_inner][\/vc_row_inner][vc_column_text]<em>Detalj av utrustning f\u00f6r omv\u00e4nd osmos samt ett typiskt arrangemang f\u00f6r omv\u00e4nd osmos.<\/em><\/p>\n<p><em>\u00a0<\/em>[\/vc_column_text][vc_column_text]<strong>J\u00e4rn och mangan<\/strong><\/p>\n<p>J\u00e4rn och mangan ger upphov till lukt samt f\u00e4rg- och smakfel i vattnet, och f\u00e4ller l\u00e4tt ut i r\u00f6rsystem och k\u00e4rl. J\u00e4rn och mangan kan avl\u00e4gsnas genom att vattnet leds genom en filtermassa. Dessutom kan massafilter anv\u00e4ndas f\u00f6r att i begr\u00e4nsad m\u00e5n avl\u00e4gsna humus och organiska \u00e4mnen.<\/p>\n<p>En anl\u00e4ggning f\u00f6r massafiltrering best\u00e5r n\u00e5got f\u00f6renklat av filterhus och ventiler. Det beh\u00f6vs vanligen ingen separat pump n\u00e4r filtren fungerar med distributionsn\u00e4tets tryck. Vid filtreringen anv\u00e4nds vanligen jonbytar- eller katalytmassa (polymerharts eller mangandioxid).<\/p>\n<p>N\u00e4r jonbytarmassa anv\u00e4nds kr\u00e4ver filtren regelbunden regenerering, d\u00e4r massans jonbytarkapacitet \u201dladdas\u201d med saltl\u00f6sning (samtidigt utf\u00f6rs backspolning). N\u00e4r katalytmassa anv\u00e4nds r\u00e4cker det att backspola filtren regelbundet. P\u00e5 grund av ovan n\u00e4mnda regenerering och spolning kr\u00e4vs det n\u00e4stan alltid fler \u00e4n ett filterhus om vattenbehovet\/vattenf\u00f6rbrukningen \u00e4r konstant (ett filterhus i taget regenereras\/spolas). Regenerering och spolning sker antingen direkt med hj\u00e4lp av automatventilerna eller med en separat styrenhet.<\/p>\n<p>Filter som bygger p\u00e5 jonbyte<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"123\">Anl\u00e4ggningens fl\u00f6deshastighet<\/td>\n<td width=\"246\">Vattenkvalitet: j\u00e4rn (under ~0,75 mg\/l) och mangan (under ~0,3 mg\/l)<\/td>\n<td width=\"227\">Anl\u00e4ggningens uppskattade storlek (L x B x H) [m]<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">8m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">1.5 x 1 x 2.3 + saltbeh\u00e5llare D0.9<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">20m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">2 x 1 x 2.3 + saltbeh\u00e5llare D1.2<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">50m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">3.5 x 1.5 x 2.3 +saltbeh\u00e5llare D1.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Katalyyttimassasuodattimet<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"123\">Anl\u00e4ggningens fl\u00f6deshastighet<\/td>\n<td width=\"246\">Vattenkvalitet: j\u00e4rn (\u00f6ver ~0,75\u00a0mg\/l) och mangan (\u00f6ver ~0,3\u00a0mg\/l)<\/td>\n<td width=\"227\">Anl\u00e4ggningens uppskattade storlek (L x B x H) [m]<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">8m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">2 x 1 x 2.3<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">20m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">3.5 x 1.5 x 2.3<\/td>\n<\/tr>\n<tr>\n<td width=\"123\">50m3\/h<\/td>\n<td width=\"246\"><\/td>\n<td width=\"227\">4.5 x 2 x 2.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n[\/vc_column_text][vc_row_inner equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; top_padding=&#8221;3%&#8221; text_align=&#8221;left&#8221;][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/3&#8243; tablet_width_inherit=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][image_with_animation image_url=&#8221;1231&#8243; animation=&#8221;None&#8221; hover_animation=&#8221;none&#8221; alignment=&#8221;&#8221; img_link_large=&#8221;yes&#8221; border_radius=&#8221;3px&#8221; box_shadow=&#8221;none&#8221; image_loading=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_width_mobile=&#8221;default&#8221;][\/vc_column_inner][vc_column_inner column_padding=&#8221;padding-3-percent&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;2\/3&#8243; tablet_width_inherit=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][image_with_animation image_url=&#8221;1229&#8243; animation=&#8221;None&#8221; hover_animation=&#8221;none&#8221; alignment=&#8221;&#8221; img_link_large=&#8221;yes&#8221; border_radius=&#8221;3px&#8221; box_shadow=&#8221;none&#8221; image_loading=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_width_mobile=&#8221;default&#8221;][\/vc_column_inner][\/vc_row_inner][vc_column_text]<em>StrongFlows jonbytarfilter med tre filterhus samt exempelbild p\u00e5 filterhus i st\u00e5l. (bild: LORIVAN NV).<\/em>[\/vc_column_text][vc_column_text]<strong>Svavelv\u00e4te<\/strong><\/p>\n<p>Svavelv\u00e4te i r\u00e5vatten f\u00f6rorsakar luktol\u00e4genheter och fr\u00e4ter p\u00e5 metallr\u00f6r. F\u00f6r att avl\u00e4gsna svavelv\u00e4te ur dricksvatten anv\u00e4nds vanligen avluftning.<\/p>\n<p>Avluftning sker vanligen i en separat beh\u00e5llare vars botten \u00e4r f\u00f6rsedd med spridarr\u00f6r som pumpar ut luft i vattnet. Luften oxiderar svavelv\u00e4tet i vattnet till sulfat.<\/p>\n<p><strong>Bakterier<\/strong><\/p>\n<p>Bakterier i r\u00e5vatten kan elimineras genom ultraviolett str\u00e5lning. I en UV-anl\u00e4ggning leds vattnet in i en kammare med UV-lampor, vilkas ljus inaktiverar mikroorganismerna i vattnet. I sin enklaste form best\u00e5r anl\u00e4ggningen av UV-utrustning och ett eventuellt styrsystem.[\/vc_column_text][vc_row_inner equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; top_padding=&#8221;3%&#8221; text_align=&#8221;left&#8221;][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/2&#8243; tablet_width_inherit=&#8221;default&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; bg_image_animation=&#8221;none&#8221;][image_with_animation image_url=&#8221;1237&#8243; animation=&#8221;None&#8221; hover_animation=&#8221;none&#8221; alignment=&#8221;&#8221; img_link_large=&#8221;yes&#8221; border_radius=&#8221;3px&#8221; box_shadow=&#8221;none&#8221; image_loading=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_width_mobile=&#8221;default&#8221;][\/vc_column_inner][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/2&#8243; 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