| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a powerless wastewater treatment method for removing organic matter and/or nitrogen in wastewater by natural ventilation by forming a gas-liquid separation interface between wastewater and the atmosphere through an oxygen permeable membrane. <P>SOLUTION: The powerless wastewater treatment method is constituted so as to remove organic matter and/or nitrogen in wastewater by natural ventilation by forming the gas-liquid separation interface between wastewater and the atmosphere through the oxygen permeable membrane and includes at least a process (1) for taking atmospheric oxygen in wastewater through the oxygen permeable membrane to aerobically treat organic matter by the biological film generated on the surface of the membrane, a process (2) for oxidizing ammonia nitrogen in wastewater to form nitrate nitrogen and a process (3) for diffusing nitrate nitrogen into wastewater held under an anaerobic environment going away from the biological film to perform denitrification reaction. Herein, the oxygen permeable membrane is formed into a cylindrical or tubular shape and arranged in the atmosphere while wastewater is introduced into the hollow part of the membrane or arranged in wastewater while the atmosphere is introduced into the hollow part of the membrane. <P>COPYRIGHT: (C)2003,JPO</p> |
