除铁除锰生物滤层内铁的氧化去除机制探讨

Study on the mechanism of Fe^(2+) oxidation and removal in the biological filter for iron and manganese removal

通过实验室的模拟滤拄实验说明了弱曝气条件下,空气接触氧化除铁的极限浓度为22~23mg/L.成熟生物滤层内铁、锰氧化细菌的营养需求研究表明:滤层内生存的铁、锰氧化细菌属贫营养细菌,对铁的营养需求极低,但对锰的需求量很大.因此,可以推断,成熟生物滤层内,极少部分铁发生的是生物氧化而大部分铁仍是通过化学氧化而去除的.

It is worthy to discuss the mechanism of iron oxidation in the biological filter with DO since the iron oxidation happens easily. The limit concentration of Fe^2＋ is 22 -23 mg/L that can be removed by air contact - oxidation under weak aeration. The research on need for the Fe^2＋ and Mn^2＋ nutrient for the iron and manga- nese oxidizing bacteria showed that most of them belonged to the poor nutrient bacteria in the filter. The quantity of Fe^2＋ that need is very little in culture and mature periods. The quantity of Mn^2＋ that need is much. These proved that most of the Fe^2＋ was removed by chemical oxidation and only a small quantity of it was removed by biological oxidation in the biological filter.