| 摘要 |
<p>An apparatus for purifying waste water in a lake, pond, dam, river and the like by use of microorganisms carried on charcoal. A plurality of water collecting pipes (4) formed therein with a plurality of water holes (5) are provided on the bottom portion (1a) of the pond or the like covered thereover with non-water permeable members (2). Charcoal (12) carrying thereon microorganisms is spread all over the water collecting pipes (4) to thereby form a treatment layer (13). A gravel layer (15) is formed on the treatment layer (13). A storage tank (18) is provided, which has a pump (29) connected thereto with a reflux pipe (31) communicating with the upper portion of the pond (1). Water (1b) to be treated which is disposed on the bottom portion (1a) is collected through the treatment layer (13) from the water holes (5) by use of the pump (29), and discharged in the vicinity of the water surface through the water collecting pipes (4) and the reflux pipe (31). When duckweeds are generated in the vicinity of the water surface, the water (1b) to be treated in the upper portion of the water surface is discharged to the treatment layer (13) through the water holes (5) of the water collecting pipes (4) by use of the pump (29). When the water (1b) to be treated passes through the treatment layer (13), the duckweeds and the organic substances are decomposed by the microorganisms carried satisfactorily on inexpensive charcoal (12). A non-uniformity in concentration of the dissolved oxygen within the whole pond or the like is reduced, so that the purifying treatment can be effectively achieved.</p> |
