Flint, MIda sodir bo'lgan suvning ifloslanishi hodisalari, tabiiy ravishda, ifloslangan ichimlik suvining sog'liqqa ta'siri haqidagi xavotirlarni kuchaytiradi. Aytish joizki, hozirgi pandemiya ham yuqumli kasallik tashvishiga butunlay yangi ma'no olib keldi. Shuning uchun ichimlik suvini zararsizlantirishning ba'zi jihatlarini, xususan, suvni zararsizlantirish uchun ultrabinafsha texnologiyalarni qo'llashni ko'rib chiqish o'z vaqtida.
UV dezinfeksiyasining qisqacha tarixi
Ajablanarlisi shundaki, ultrabinafsha nurlari suvni tozalashning samarali texnologiyasi sifatida 200 yildan ortiq vaqt davomida tan olingan va ultrabinafsha mikroblarga qarshi nurlanish (UVGI) birinchi marta dezinfeksiya usuli sifatida 100 yildan ko'proq vaqt oldin ishlatilgan. O'shandan beri UV butun dunyo bo'ylab suv tozalash inshootlarida mustahkam o'rnatildi va so'nggi o'n yilliklarda kimyoviy dezinfeksiyadan foydalanish amaliy bo'lmagan va istalmagan bo'lgan turar-joy (butun{2}}uy, POE) ilovalari uchun tobora ommalashib bormoqda. Zararli kimyoviy moddalarni tashish, saqlash va qayta ishlash zaruriyatini DBPlarni yo'q qilish bilan birga olib tashlash UVni asosiy dezinfeksiya usuli sifatida qabul qilishga yordam berdi, ammo quvurlarni taqsimlash tizimi mavjud bo'lganda dezinfeksiya qoldiqlarining etishmasligi hali ham hisobga olinishi kerak. To‘lqin uzunligi 253,7 nanometr (nm) bo‘lgan o‘ziga xos spektral chiqishiga ega yuqori-chiqishli, past bosimli simob lampalarining joriy etilishi kichikroq miqyosdagi (masalan, turar-joy) ilovalar uchun juda amaliy taklifga aylanishiga imkon berdi.
It could be said that the particular wavelength emitted from low pressure (UV) mercury lamps is a happy accident, given that it is very close to the peak germicidal wavelength for the inactivation of pathogens in the range of 262 – 265 nm. More recently, a very significant technology advance has been the development and introduction of UV-C LEDs, which offer several advantages including the absence of mercury and instant-on (no warm up period required) technology, allowing for intermittent rather than 24/7 power application. In 2012, UV-C LEDs made their first appearance into the commercial water disinfection system market. The initial systems were smaller than conventional mercury vapor systems; however, they typically had lower flowrates and cost several thousands of dollars. Since then, UV-C LEDs have primarily grown in POU applications with systems becoming more compact, making them easily integrated or retro-fitted into existing products. As the design of UV-C LED systems improved, they have finally become competitive in the POE UV disinfection market. The improvements of these systems were most noticeable in their robustness, reactor efficiency and cost of ownership when compared to conventional mercury systems.
