| abstract |
(57) [Summary] [PROBLEMS] To form a gas-liquid separation interface between waste water and the atmosphere via an oxygen permeable membrane, and remove organic matter and / or nitrogen in the waste water by natural ventilation. A gas-liquid separation interface is formed between a wastewater and the atmosphere via an oxygen permeable membrane, and organic matter and / or nitrogen in the wastewater is removed by natural ventilation. Unpowered wastewater treatment method, At least the following processing steps are included. (1) Atmospheric oxygen is taken into wastewater through an oxygen permeable membrane, and aerobic treatment of organic substances is performed by a biofilm generated on the membrane surface. (2) Oxidize the ammonia nitrogen in the wastewater to produce nitrate nitrogen. (3) Nitrate nitrogen is diffused in wastewater under an anaerobic environment away from the biofilm to cause a denitrification reaction. Here, the oxygen permeable membrane is formed in a tubular or tubular shape, and the drainage is introduced into the hollow portion and installed in the atmosphere, or the air is introduced into the air and installed in the drainage so that gas-liquid separation is performed. I have. |