The paper analyses the decolorizing mechanism of biofiltration and the hardening of filter materials and finally concludes that the mixed argil grain and spongy iron is the best.

• 分析了曝气生物滤池脱色机理及需要注意的滤料板结问题,提出了以陶粒和海绵铁混合滤料为佳的结论。