| 摘要 |
<p>The device for cleaning wastewater, comprises a purification tank (2) for receiving wastewater (1), a ventilation unit (6) disposed in bottom of the tank and covered by a lower layer, and a plantation including aquatic plants such as reeds placed in an upper part of the tank. The tank comprises three layers superimposed of a filtering material in the form of grains or aggregates, the lower layer of grain size within a predetermined range located in the bottom of the tank, an intermediate layer of particle size less than the lower layer located above the lower layer, and a top layer. The device for cleaning wastewater, comprises a purification tank (2) for receiving wastewater (1), a ventilation unit (6) disposed in bottom of the tank and covered by a lower layer, and a plantation including aquatic plants such as reeds placed in an upper part of the tank. The tank comprises three layers superimposed of a filtering material in the form of grains or aggregates, the lower layer of grain size within a predetermined range located in the bottom of the tank, an intermediate layer of particle size less than the lower layer located above the lower layer, a top layer of grain size (2-4 mm) less than that of the intermediate layer located above the intermediate layer, an additional lower layer of particle size less than the intermediate layer located above the intermediate layer and below the upper layer, and an additional top layer between the lower layer and the upper layer and comprising an additional ventilation unit. The ventilation unit is used for recuperating the filtered and purified water. The top layer and additional lower layer are composed of porous type of material capable of promoting the development of micro-organisms. The porous material layer consists of shale expanded aggregate. The ventilation unit and additional ventilation unit are connected to a vertical pipe (5) forming a ventilation stack. A unit is arranged for distribution of wastewater between the purification tanks.</p> |
