ОЧИСТКА И ОБЕЗЗАРАЖИВАНИЕ ВОДЫ УФ ИЗЛУЧЕНИЕМ СВЕТОДИОДНОЙ МАТРИЦЫ (365 НМ) В ЖЕЛЕЗО-ПЕРСУЛЬФАТНОЙ СИСТЕМЕ
Аннотация
В данном исследовании изучены кинетические закономерности и определены дозы УФ излучения для одновременной деструкции гербицида атразина и инактивации бактерий Escherichia coli и Enterococcus faecalis в железо-персульфатной окислительной системе {УФ/ПС/Fe2+} с применением УФ-А светодиодной матрицы (365 нм). Установлено, что данная система является наиболее эффективной для деструкции атразина и инактивации E. faecalis в ряду: {УФ/ПС/Fe2+} > {УФ/ПС} > {ПС/Fe2+} > {УФ}. Эффективность инактивации E. coli в системах {УФ/ПС/Fe2+} и {УФ/ПС} была одинаковой, что вызвано преобладающим вкладом высокоинтенсивного УФ излучения, к воздействию которого кишечная палочка менее устойчива, чем энтерококки. Доза УФ излучения для деструкции 90% атразина в отсутствии бактерий в железо-персульфатной системе составила 0,48 Дж/см2, тогда как для инактивации 100% клеток E. coli и E. faecalis без атразина – 0,94 и 1,43 Дж/см2, соответственно. Внесение бактерий в раствор вызвало ингибирование деструкции атразина и снижение соответствующих констант скорости (и увеличение доз излучения) на один порядок. Ингибирование инактивации бактерий в присутствии гербицида было более выражено для энтерококков. При этом, для разложения атразина требовались значительно более высокие УФ дозы (7,7 Дж/см2), чем для полной инактивации E. coli (1,0 Дж/см2) и E. faecalis (2,1 Дж/см2), что обеспечивало одновременное обеззараживание воды. Полученные результаты свидетельствуют о принципиальной возможности и энергоэффективности одноэтапной очистки и обеззараживания воды в железо-персульфатной системе, активированной излучением УФ-А светодиодной матрицы.
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