| 摘要 |
Apparatus for the purification of waste water and/or waste gas using a biofilter containing a filtering material, wherein the waste water move downwardly thereinto while the waste gas move upwardly or downwardly thereinto, is disclosed. Also disclosed is an apparatus for simultaneous purification of waste water and waste gas, comprising a filtering material comprised of a succession of layers. In a preferred embodiment, the upper layer of filtering carrier material has a substantially lower filtration capacity than a lower layer of filtering carrier material, to prevent clogging of the filtering material upon downward flow of the waste water. A negative gradient of filtering capacity in the direction of flowing gas is also provided, for preventing adverse pressure drop of gas flowing through the filtering material. More conveniently, the apparatus comprises sufficient filtering material between the gas inlet and water outlet to ensure that the water coming out of the apparatus has not been substantially contamined by the upwardly moving waste gas. Filtering compositions for purification of waste water and waste gas are also disclosed. Finally, the invention relates to a method for the purification of various types of waste waters and/or waste gases. |
