| 摘要 |
<p>The granulometry: of the C2 layer is lower than the C1 layer; C3 is identical or higher than the C1 layer; C4 layer is higher than C3; and C5 layer is higher than C4. The granulometry of C1, C2, C4 and C5 layers are 1/10 mm, 0/6 mm, 15/25 mm and 30/60 mm respectively. The C2 layer is composed of sand or analogue. The C1, C4 and C5 layers are composed of gravels, rollers or analogues. The air or oxygen is diffused by communicating ventilator or compressor with atmosphere through chimney. The oxygen is diffused through the interface between the C1 and C2 layers. The thickness of the C1 and C2 layers are 0.2-0.6 m and 0.15-0.4 m respectively. The thickness of the C3 and C4 layers is 0.1-0.4 m. An organic layer is formed on the surface of the C1 layer. The surface of the device is planted reeds. The medium for allowing air or oxygen is selected from an agricultural drain, road drain, slotted or bored tube, hollow box and honeycomb structure. Independent claims are also included for: (1) purification station; and (2) wastewater treatment.</p> |
