{"id":58,"date":"2016-09-01T20:24:23","date_gmt":"2016-09-01T20:24:23","guid":{"rendered":"http:\/\/totaltheme.wpengine.com\/adapt\/?p=58"},"modified":"2018-12-29T07:25:12","modified_gmt":"2018-12-29T06:25:12","slug":"music-festival-2016","status":"publish","type":"post","link":"https:\/\/dosita.com.tr\/?p=58","title":{"rendered":"UV disinfection"},"content":{"rendered":"

Difference between ozone and UV<\/h2>\n

\u0097Ozone disinfect via air\/ozone injected into water
\n\u0097UV Disinfect by exposing water to UV light<\/p>\n

How does UV work<\/h3>\n

\u0097UV means ultraviolet
\n\u0097UV wave has high energy in its envelop
\n\u0097UV waves has various wave length, hence different applications
\n\u0097UV for disinfection has specific wave length of 254 angstrom<\/p>\n

UV 254 wave length<\/h3>\n

This typical wavelength and high energy allows the wave to penetrate the DNA of bacteria and disable it
\n\"\"<\/p>\n

Disinfection mechanism<\/h3>\n

\u0097UV-C rays will destroy a minimum of 99.99% of harmful microorganisms, including E. coli, Cryptosporidium and Giardia.
\n\u0097Unlike chemical disinfection the organisms are unable to develop any immune mechanism against UV light.
\n\u0097The degree of UV inactivation of pathogens is directly proportional to the UV dose applied to the water<\/b><\/p>\n

UV Intensity<\/h3>\n

\u0097UV dose is the product of UV light intensity and exposure time and is expressed in mJ\/cm2.
\n\u0097NSF International has established a UV dose of 40 mJ\/cm2 as the minimum UV dose required to ensure that all bacteria, viruses, Giardia and Cryptosporidium are killed or inactivated to a safe level.
\n\u0097Other standard allows 30mj\/cm2. As per WHO<\/p>\n

The Advantages of UV <\/b>Disinfection<\/b><\/h3>\n

\u0097More effective against viruses than chlorine
\n\u0097Environmentally and user friendly, no dangerous chemicals to handle or store, no risks of overdosing
\n\u0097Low initial capital cost as well as reduced operating expenses when compared with similar technologies such as ozone, chlorine, etc.
\n\u0097Immediate treatment process, no need for holding tanks, long retention times, etc.
\n\u0097Extremely economical, hundreds of gallons may be treated for each penny of operating cost
\n\u0097No chemicals added to the water supply \u2013 no byproducts, (i.e. chlorine + organic compounds = trihalomethanes)
\n\u0097No change in taste, odor, pH, conductivity, nor the general chemistry of the water
\n\u0097Automatic operation without special attention or measurement, operator friendly
\n\u0097Simplicity and ease of maintenance, periodic cleaning, (if applicable), and annual lamp replacement, no moving parts to wear out
\n\u0097No handling of toxic chemicals, no need for specialized storage requirements
\n\u0097Easy installation, only two water connections and a power connection
\n\u0097Compatible with all other water purification processes, (i.e. reverse osmosis, filtration, water conditioning and softening)<\/p>\n

Pre treatment\u00a0 before UV<\/h3>\n

To maximize the efficiency of the UV unit, pre-treatment is advisable. The most common pre-treatment methods are<\/b>:<\/b><\/p>\n

\u0097Sediment filters to remove silt that shelters microbes and scatters or absorbs the UV. Silt can drastically cut the effectiveness of a UV unit.
\n\u0097Carbon filtration to remove organic materials that absorb UV.
\n\u0097A water softening unit to remove minerals that coat the UV lamp sleeve and cut down transmitted light.<\/p>\n

What affects UV performance<\/h3>\n

\u0097The effectiveness of a UV system in eliminating microbiological contamination is directly dependent on the physical qualities and\/or clarity of your water supply.
\n\u0097Suspended Solids,<\/b>Particulate matter can cause shielding problems, in which a microbe may pass through the UV chamber without actually having any direct UV penetration.
\n\u0097Iron\/Manganese<\/b>\u00a0,Will cause staining on the quartz sleeve that houses the UV bulb, at levels as low as 0.3 PPM of iron and 0.05 PPM of manganese. In this case, we recommend the installation of a Water Softener and\/or an automatic Iron Filter system, as a proper step towards pretreatment which will help eliminate this staining problem. Note: not all UV systems will require the use of a softener if there is iron or manganese present, contact us for details.<\/p>\n

More factors<\/h3>\n

\u0097Calcium\/Magnesium,<\/b> Hardness in your water will cause possible scale formation on the lamp protecting the quartz sleeve. Scaling problems will be especially magnified during low flow or no flow times when the calcium and magnesium ions tie up with carbonates and sulfates to form hard scale buildup inside the chamber and quartz sleeve.
\n\u0097Temperature is a determining <\/b>factor, <\/b>The optimal operating temperature of the UV lamp must be near 40 degrees C.UV levels will fluctuate with excessively high or low temperature levels.<\/p>\n

Critical Parameters for performance<\/h3>\n

\u0097Flow rate
\n\u0097How does flow rate affects UV efficiency
\n\u0097Contact time
\n\u0097Optimum UV intensity
\n\u0097Doping of heavy metals<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Difference between ozone and UV \u0097Ozone disinfect via air\/ozone injected into water \u0097UV Disinfect by exposing water to UV light How does UV work \u0097UV means ultraviolet \u0097UV wave has high energy in its envelop \u0097UV waves has various wave…<\/p>\n","protected":false},"author":3,"featured_media":774,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-58","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","entry","has-media"],"_links":{"self":[{"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/posts\/58","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=58"}],"version-history":[{"count":3,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/posts\/58\/revisions"}],"predecessor-version":[{"id":775,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/posts\/58\/revisions\/775"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=\/wp\/v2\/media\/774"}],"wp:attachment":[{"href":"https:\/\/dosita.com.tr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=58"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=58"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dosita.com.tr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=58"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}