抄録
Effect of phosphorus on water treatment with biological activated carbon (BAC) was studied by evaluating the biodegradation rates of glucose and humic acid with BAC-attached bacteria, the ability of BAC-packed column to remove these organic matters, and the change in the number of bacteria in the water in the presence and absence of phosphorus. Addition of phosphorus to the sample water increased the number of bacteria in BAC and resulted in an improvement of the ability of BAC-packed column to remove glucose. High molecular weight organic phosphorus, DNA, as well as inorganic phosphate, was available as phosphorus source for the bacteria in BAC. The ability of the BAC-packed column to remove humic acid was not improved with phosphorus, because humic acid with high molecular weight was so hard to be utilized as a sole carbon source that the BAC-attached bacteria could not grow. However, humic acid was found to be degraded slowly to lower molecular weight matter depending on the number of bacteria in the BAC-packed column. These results indicated that phosphorus content in sample water was an important factor to control the ability of BAC to remove organic matters.
