| 摘要 |
A filtration device for filtering polluted water, the polluted water including a first type of matter having a density higher than water and a second type of matter having a density lower than water, the filtration device comprising: a container portion for receiving an inflow of the polluted water and being arranged to allow an outflow of water at an outflow level that is sufficiently high such that in use water with matter of the second type will exit the container portion and, facilitated by gravity, at least a portion of the matter of the first type will remain in the container portion, the container portion having an aperture for backflow of water; a filtration element for filtering matter of the first type out of the water and having a receiving face for receiving the polluted water and being oriented such that in use the polluted water flows largely in a direction along at least a portion of the face of the filtration element and water that flowing through the filtration element exists the container portion; and an arrangement for directing water back into the container portion, the arrangement being configured such that at least a portion of the water that flowed out of the container portion at the outflow level flows back into the container portion via the aperture without or with a reduced volume of the particles of the second type. A method of filtering polluted water is also disclosed. |
