UV technologies
Lub sij hawm siab siv los piav txog UV tshuab hauv qab no yog hais txog cov qauv ntawm mercury teeb siv nyob rau hauv UV system thiab lub siab ntawm cov roj hauv lub teeb, tsis yog lub siab ntawm cov dej kho. Nruab nrab- cov roj teeb siab muaj qhov tso zis tas li ntawm 200 mus rau 400 nm, nrog rau cov spectrum yog tshwj xeeb rau txhua qhov chaw tsim khoom. Tsawg- cov roj teeb siab tsim ob txoj kab nqaim UV, ib qho ntawm 185nm thiab ib qho ntawm 254 nm. 185 nm kab tsim ozone hauv huab cua thiab lim tawm rau ntau daim ntawv thov los ntawm kev xaiv cov quartz zoo siv los ua lub teeb.
Medium pressure. Medium-pressure systems have been used primarily for water disinfection for many years. These systems typically have a stainless steel chamber that fits in-line with the plumbing and has the lamp located perpendicular to the flow. This makes for a compact system which can be retrofitted to existing plumbing. The controls and ballast are typically housed in a cabinet nearby. The technology does, however, have some drawbacks when compared with low-pressure units. Medium-pressure systems use more energy, have a shorter lamp life and operate at a much higher lamp surface temperature (up to 1,600 degree /2,912 degree F ) than a comparable low-pressure system.
Low pressure – conventional. The most recognizable UV systems in use today are systems that utilize low-pressure mercury lamps. These units are typically constructed in a stainless steel pressure vessel with the lamps installed parallel to the water flow. Chamber diameter, the number of lamps and the lamp length determine the capacity of the equipment. With minor improvements, this design has been in place for over 50 years. A major drawback to this design (as well as the medium pressure systems discussed above) is the fact that stainless steel absorbs about 80 percent of the UV light that impinges on its surface. This greatly increases the number of lamps and energy consumption required to achieve the desired level of UV treatment, which has added to the market perception that UV treatment carries a high operating cost.
Earlier attempts to reduce operating costs. There have been a number of attempts to improve the performance of UV systems by replacing the stainless steel-walled chambers with designs that overcome the inherent lossy (dissipation of electrical energy) nature of conventional chambers. A number of designs use an external reflector made of aluminum. Aluminum has a much higher level of reflectivity of UV (generally 80 to 90 percent or more) than stainless steel. In one such design, the flow tube is in the center, with lamps and parabolic reflectors surrounding the flow. This design provides an improved reflection of the UV, however, most of the UV is outside the flow of water, limiting the overall efficiency. Another drawback is that the systems can get quite large for higher flows.
Lwm lub tshuab siv cov cuab yeej uas teeb pom kev zoo ntawm qhov chaw ntawm lub kaum sab xis qis heev yuav luag tag nrho. Cov tshuab no muaj cov teeb ntawm ib lossis ob qho kawg ntawm lub raj ntws ntev, yog li feem ntau ntawm UV teeb uas ncav cuag lub raj ntws ntws rov qab mus rau hauv dej. Taw qhia lub teeb kom zoo rau hauv lub raj ntev ntws los ntawm nws qhov kawg yog ib qho ntawm cov teeb meem uas txwv qhov kev ua tau zoo ntawm lub chamber tsim.
