²»Í¬±ÈÀýµÄNaOCl£¯NH₂ClºÍClO₂ÁªÓöԪ©ClOªªª¬-₂µÄÓ°Ïì

ÏàÀ¤, ÑîÑÞÁá, ÀîÐÇ, ÕÅ´ï, ÁõÑïÑô, »ÆÁø, ÐíÃÀÁá

(±±¾©¹¤Òµ´óѧ ½¨Öþ¹¤³ÌѧԺ, 100124 ±±¾©)



ÕªÒª:

Ϊ¼õÉÙ¶þÑõ»¯ÂÈ(ClO₂)Ñõ»¯Ê±²úÉúµÄ¶¾º¦ÐÔ¸±²úÎïÑÇÂÈËáÑÎ(ClO₂ª¬-),²ÉÓÃÂÈ£¨NaOCl£©£¯°±°·£¨NH₂Cl£©ºÍClO₂ÁªÓõķ½·¨,ÒÔ³¬´¿Ë®ÎªÊµÑéË®ÖÊ,¿¼²ìNaOCl¡¢NH₂ClºÍClO₂ª¬-¡¢ClO₂ÁªÓÃʱClO₂ºÍClO₂ª¬-µÄ±ä»¯£®½á¹û±íÃ÷:NaOCl£¯NH₂ClË®½â²úÉúµÄ´ÎÂÈËá(HOCl)ºÍClO₂ª¬-·´Ó¦ÊÇNaOCl£¯NH₂ClºÍClO₂ÁªÓÃʱClO₂ª¬-¼õÉÙ¡¢ClO₂Ôö¼ÓµÄÔ­Òò,¶øÇÒClO₂µÄÔö¼ÓÁ¿¶àÓÚClO₂ª¬-µÄ¼õÉÙÁ¿;NaOClºÍClO₂ÒÔ3¡Ã1ÁªÓá¢NH₂ClºÍClO₂ÒÔ1¡Ã1ÁªÓÃʱ·´Ó¦ËÙÂÊ×î´ó;Ë®ÖÐNaOClºÍClO₂ª¬-¡¢NH₂ClºÍClO₂ª¬-´æÔÚ±ÈÀýΪ1¡Ã1¡¢1¡Ã2ʱ,ClO₂ª¬-ÄÜÈ«²¿×ª»¯ÎªClO₂;Ïà±ÈNaOClºÍClO₂ÁªÓÃ,µÈÁ¿µÄNH₂ClºÍClO₂ÁªÓÃÄܹ»¸üÓÐЧµØÔö¼ÓClO₂ÓàÁ¿,ÇÒ¾ù¾ßÓнϸߵķ´Ó¦ËÙÂÊ£®NaOCl£¯NH₂ClºÍClO₂ÁªÓÿÉÒÔ¼õÉÙClO₂ª¬-Éú³ÉÁ¿¡¢Ôö¼ÓClO₂ÓàÁ¿,NaOClºÍClO₂¡¢NH₂ClºÍClO₂Ó¦ÓÃÓÚ΢ÎÛȾˮµÄÑõ»¯Ê±,3¡Ã1¡¢1¡Ã1·Ö±ðÊÇÁ½ÖÖÑõ»¯·½Ê½¼õÉÙClO₂ª¬-Éú³ÉÁ¿¡¢Ôö¼ÓClO₂ÓàÁ¿µÄ×îСͶ¼Ó±ÈÀý£®

¹Ø¼ü´Ê:  ÂÈ  ÂÈ°·  ¶þÑõ»¯ÂÈ  ÁªÓà ÑÇÂÈËáÑΠ ±ÈÀý  Î¢ÎÛȾˮ

DOI£º10.11918/j.issn.0367-6234.2014.02.017

·ÖÀàºÅ:

»ù½ðÏîÄ¿:¹ú¼Ò×ÔÈ»¿Æѧ»ù½ð×ÊÖúÏîÄ¿(51178003);±±¾©ÊÐ×ÔÈ»¿Æѧ»ù½ð×ÊÖúÏîÄ¿(8122013);±±¾©¹¤Òµ´óѧÑо¿Éú¿Æ¼¼»ù½ð×ÊÖúÏîÄ¿(ykj-2012-7025).



Effect of various ratios of chlorine£¯monochloramine and chlorinedioxide on chlorite ions

XIANG Kun, YANG Yanling, LI Xing, ZHANG Da, LIU Yangyang, HUANG Liu, XU Meiling

(College of Architectural and Civil Engineering, Beijing University of Technology, 100124 Beijing, China)

Abstract:

The combination of chlorine dioxide(ClO₂) and chlorine(NaOCl) or monochloramine(NH₂Cl) was used to degrade the formation of ClO₂ª¬-, when ClO₂ was used as an effective oxidant which could form undesirable oxidation by-products, i.e. ClO₂ª¬-. In this article, Mill-Q water was used, and the impact of NaOCl or NH₂Cl combined with ClO_2or ClO₂ª¬-on the yield of ClO₂ª¬-and ClO₂ were investigated by monitoring the residual of NaOCl, NH₂Cl, ClO₂ and ClO₂ª¬-. It was proved that when NaOCl or NH₂Cl combined with ClO₂, hypochlorousacid(HOCl) formed by NaOCl or NH₂Cl could react with ClO₂ª¬-, which was the reason that ClO₂ª¬-yield reduced and ClO_2yield increased, and the increase in ClO_2yield exceeded the decrease in ClO₂ª¬-yield. For the purpose of the highest reaction rate, the optimal ratio between NaOCl and ClO₂ was 3¡Ã1, while it was 1¡Ã1 between NH₂Cl and ClO₂. The appropriate ratios of residual NaOCl£¯NH₂Cl and ClO₂ª¬-for ClO₂ª¬-complete removal were found to be close to the value of 1 and 0.5 respectively. Furthermore, compared with NaOCl, equivalent yield of NH₂Cl had much more ClO₂ residual yield when reacted with ClO₂, and had faster reaction rate in any ratio. It can be concluded that the generation of ClO₂ª¬-is typically much lower and the residual of ClO₂ is much higher with combination of ClO_2and NaOCl or NH₂Cl when compared to the use of ClO_2alone. And the minimum ratio between NaOCl and ClO₂, NH₂Cl and ClO_2are 3¡Ã1 and 1¡Ã1 respectively when used in micro-polluted water.

Key words:  chlorine  monochloramine  chlorine dioxide  combination  chlorite ions  ratio  micro polluted water