{"id":28741,"date":"2018-03-08T11:22:30","date_gmt":"2018-03-08T15:22:30","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=28741"},"modified":"2018-07-24T10:51:02","modified_gmt":"2018-07-24T14:51:02","slug":"city-officials-fight-taste-odor-issues-drinking-water-win","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/city-officials-fight-taste-odor-issues-drinking-water-win.htm","title":{"rendered":"City Officials Fight Taste, Odor Issues in Drinking Water\u2014and Win"},"content":{"rendered":"<p><a href=\"http:\/\/www.maryville.org\/\"><span style=\"font-weight: 400;\">Maryville, Missouri<\/span><\/a><span style=\"font-weight: 400;\"> is home to Northwest Technical School, Northwest Missouri State University, and the Missouri Academy of Science, Mathematics and Computing as well as nearly 12,000 citizens. The unusually warm winter has allowed a large algal bloom to form in Mozingo Lake, the primary source of drinking water in the area. City and state officials began to deal with the problem in January, and within a month, those efforts were paying off.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Corinne N. Rosania, the Environmental Manager of the Water Section of the Missouri Department of Natural Resources corresponded with EM about the treatment efforts.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cSurface water treatment is a complex process for water treatment operators and must be monitored for daily changes in the raw water quality in order to adjust the treatment process,\u201d Rosania explains. \u201cIn Fall 2017, ambient temperature changes caused what is known as \u2018lake turnover\u2019 in Mozingo Lake.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lake turnover is natural water movement that is seasonal, caused by temperature changes. This turnover causes fluctuations in the thermocline, or water strata, as organics are moved from the bottom of the lake to its surface. Because of that, turnover can often result in noticeable changes in taste and odor. These natural weather-related changes were at the root of the algal bloom issue in Mozingo Lake.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cVarious types of algae can produce noticeable taste and odor changes in the water,\u201d details Rosania. \u201cThese changes are aesthetically unappealing, but have not resulted in any bacteriological samples that could cause concern for public health.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To deal with the taste and odor fluctuations, there are a range of processes that water treatment managers try, but it&#8217;s a complex process.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201c<\/span><a href=\"http:\/\/www.peopleservice.com\/\"><span style=\"font-weight: 400;\">PeopleService<\/span><\/a><span style=\"font-weight: 400;\"> operates the City of Maryville\u2019s water treatment plant, and began increasing their application of PAC (powder-activated carbon) which helps adsorb odors and alleviates taste issues; however, the increased use of PAC in the treatment process must be monitored closely so as not to plug the plant\u2019s water filtration membranes, Rosania describes. \u201cIn addition, sodium permanganate and chlorine dioxide (oxidizers) were also increased to help alleviate the taste\/odor issues; the raw water intake was adjusted based on pH, temperature and other water quality parameters.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Further contributing to the complexity of the situation were changes with the mains that were initiated in Fall of 2017.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIncreased flushing in the distribution system\u2019s water mains was also initiated by PeopleService to improve the water quality,\u201d states Rosania. \u201cOn January 3, 2018, the City of Maryville began a free chlorine conversion, meaning they turned off the ammonia feed and increased the free chlorine disinfectant residual in an additional effort to combat the taste\/odor issues. This change, in addition to flushing the distribution water mains, has helped to alleviate the taste\/odors present in the distribution system.\u201d<\/span><\/p>\n<div id=\"attachment_28744\" style=\"width: 630px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-28744\" class=\"size-large wp-image-28744\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2018\/03\/city_officials_mozingo2-1024x683.jpg\" alt=\"Maryville\" width=\"620\" height=\"414\" \/><p id=\"caption-attachment-28744\" class=\"wp-caption-text\">Mozingo Lake in Missouri. (Credit: CC BY-SA 2.5)<\/p><\/div>\n<p><span style=\"font-weight: 400;\">On January 8, 2018, the City of Maryville held a public meeting to keep citizens in the loop. There Steve Guthrie of PeopleService presented information to the public on the taste and odor issues at Mozingo Lake, and described the steps the city had taken to address the issue. Guthrie also revealed the details of the planned process moving forward.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe City of Maryville has engaged with other systems to initiate development of a comprehensive Lake Management Plan,\u201d Rosania explains. \u201cIn addition, this city is considering purchasing mixing equipment to keep the lake well-mixed to prevent algal growth in the future. The Lake Management Plan would be a program to monitor their source water quality and conduct microscopic analysis\/speciation of algae in an onsite laboratory to help them determine optimal operational adjustments that may be helpful in the future.\u201d<\/span><\/p>\n<p><a href=\"https:\/\/www.nwmissourinews.com\/news\/article_9b8db6d2-0c57-11e8-b5ce-e7b988814522.html\"><span style=\"font-weight: 400;\">According to the Northwest Missourian News<\/span><\/a><span style=\"font-weight: 400;\">, the mixing equipment being considered is<\/span><a href=\"https:\/\/www.youtube.com\/watch?v=A68KqDsNyno\"> <span style=\"font-weight: 400;\">SolarBees, a mechanical \u201cmixing\u201d system<\/span><\/a><span style=\"font-weight: 400;\">. SolarBees are powered by solar energy and pull deeper, colder water from the bottom of a lake and distribute it toward the water&#8217;s surface, preventing stratification and the kind of static aquatic environment that can encourage algae growth.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The city&#8217;s efforts appear to be working\u2014a welcome result among a tableau of mixed results nationwide.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cA raw lake water sample was analyzed in late December 2017, and at that time, several known taste and odor-causing algae species were present,\u201d Rosania describes. \u201cOn January 9, 2018, a MoDNR KCRO Water Specialist conducted an assistance visit at Maryville\u2019s water treatment plant and inspected the raw water with a microscope; based on the few species found, it appeared that the algal bloom had largely dissipated.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Maryville officials are following up, working to prevent further issues as the mechanical solutions are considered.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cOur Water Specialist suggested that the city continue the following: development of the Lake Management Plan proposal; development of a Source Water Protection Plan; further investigation into proper adjustments to the raw water intake levels to ascertain the best level for water quality for the treatment process; running routine tests for chemical feed adjustment at the plant; and also considering a pilot project for implementing additional treatment techniques at the intake to further treat taste and odors from the raw water,\u201d adds Rosania.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">By early February, students interviewed by the<\/span><a href=\"https:\/\/www.nwmissourinews.com\/news\/article_9b8db6d2-0c57-11e8-b5ce-e7b988814522.html\"> <span style=\"font-weight: 400;\">Northwest Missourian News<\/span><\/a><span style=\"font-weight: 400;\"> reported that the drinking water tastes \u201cthe best it&#8217;s ever been.\u201d Meanwhile, officials are implementing their plans.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cEach month, the City of Maryville collects 10 routine bacteriological samples for drinking water throughout the distribution system to ensure the water is safe to drink (i.e., total coliform absent) and evaluates disinfectant residuals to ensure they are within protective ranges,\u201d details Rosania. \u201cA review of these routine bacteriological samples, other chemical results, violation history, etc. can be viewed on the<\/span><a href=\"https:\/\/www.dnr.mo.gov\/DWW\/indexSearchDNR.jsp\"> <span style=\"font-weight: 400;\">MoDNR\u2019s Drinking Water Watch website<\/span><\/a><span style=\"font-weight: 400;\">.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maryville, Missouri officials along with state officials have successfully dealt with an algal bloom affecting drinking water caused by a very warm winter.<\/p>\n","protected":false},"author":31,"featured_media":28743,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,32],"tags":[308,586,60,346],"class_list":["post-28741","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-articles","category-lakes-reservoirs","tag-algae","tag-cyanobacteria","tag-featured","tag-lakes-reservoirs"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>City Officials Fight Taste, Odor Issues in Drinking Water\u2014and Win<\/title>\n<meta name=\"description\" content=\"Maryville, Missouri officials along with state officials have successfully dealt with an algal bloom affecting drinking water caused by a very warm winter.\" \/>\n<meta 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