| 摘要 |
<p>PURPOSE:To efficiently remove phosphorus and ammonia, by aerobically treating phosphorus- and ammoniac nitrogen-contg. waste water, bringing it into contact with calcium phosphate-contg. solid bodies in the presenc of Ca ion, and then anaerobically treating it in the presence of an organic carbon source. CONSTITUTION:Nitrogen- and phosphorus-contg. waste water 1 such as purified water discharged from treatment of sewage with active sludge is let flow into a packed column 3 packed with granular solid bodies 4 such as sand and maintained under an aerobic condition through its top part. In the packed column 3, ammoniac nitrogen is oxidized into nitric ion. After a calcium agent 7 is optionally added to an effluent 6, the effluent is introduced into a dephosphorizing column 8, where the effluent is brought into contact with a colcium phosphate- contg. catalytic filter 9 to remove phosphorus. An organic carbon source 11 such as methanol is then added to the effluent 10, and the effluent is carried to the top part of a denitrification column 12 packed with granular bodies 13 such as sand in an anaerobic atmosphere to reduce the nitric ion into nitrogen gas and to remove it.</p> |
