| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus capable of efficiently reducing the concentration of COD in wastewater. <P>SOLUTION: The wastewater treatment apparatus 10 is equipped with a plurality of treatment tanks containing microorganisms for decomposing organic matter containing a hardly biodegradable chelating agent. In the first treatment tank 200, wastewater with the concentration of COD of 0.5-20 g/L is treated to reduce the concentration of COD of wastewater to 1/5-4/5. In the second treatment tank 300, wastewater with the concentration of COD of 0.1-16 g/L, which is the wastewater after the treatment in the first treatment tank 200, is treated to reduce the concentration of COD to 1/5 or less in the whole of the wastewater treatment apparatus 10. In this case, microorganisms in the first treatment tank 200 are acclimatized to wastewater high in concentration as compared with microorganisms in the second treatment tank 300. <P>COPYRIGHT: (C)2003,JPO</p> |
