接触氧化除锰滤池的快速启动

Quick start-up of filter for removing manganese by contact oxidation method

以廉价河砂为填料,采用间歇臭氧曝气的方式,使原水中Mn2+迅速被氧化成不溶于水的化合物附着在河砂表面形成具有除锰能力的锰质活性滤膜。在实验室条件下,当间歇臭氧曝气量为50 ml.min-1,每天曝气4次,每次10 min时,仅用5 d即可形成成熟锰质活性滤膜,使出水持续稳定在0.1 mg·L-1以下,大大缩短了除锰滤池的成熟期。对成熟滤池的最佳运行条件进行了探讨,结果表明对于锰离子浓度约为1.5 mg·L-1的原水,在DO值大于6.5 mg·L-1、pH值大于7.0、出水流速小于0.6 m.h-1的条件下,可以较好地维持滤料表面滤膜的活性,使滤料的除锰能力长期有效。

Using cheap river sands as packing material and applying ozone non-continuous aeration,Mn2＋ in raw water was oxidized into insoluble compounds that attached to sand surface and formed activated membrane having ability to remove manganese.The activated membrane became mature within only five days under the experimental conditions： ozone aeration four times a day,10 min each time at 50ml·min-1.The concentration of Mn2＋ in effluent could be lower than 0.1 mg·L-1.The maturity period of the filter for manganese removal was significantly reduced.The optimum operation condition for the mature filter was also explored.The results indicated that the filter surface membrane could maintain efficiency for a long time at the following conditions： manganese concentration in raw water 1.5 mg·L-1,pH higher than 7.0,dissolved oxygen concentration more than 6.5 mg·L-1 and water flow rate less than 0.6 m·h-1.