The production and application problems of biological sand filter in treating micro-polluted water were studied in this paper, using the Fuyang River as source water.

Using Pearl River source water as raw water, the contaminant removal effect of carbon and sand filter after the biological aerated filter(BAF)pretreatment process was investigated.

Cheap sand was used as filtration material in the biological contact oxidation filter to study the effects of fe removal under different conditions.