| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a treatment method of wastewater with a large treatment load, such as disposer wastewater. <P>SOLUTION: Before treating wastewater containing garbage disposer treatment wastewater in a sewage treatment plant, the disposer wastewater and other various kinds of wastewater are separately collected in a building or a small-scale residential area, which is a source of the wastewater. The various kinds of wastewater are treated in a pretreatment settlement tank, aerobic aeration tank, and an anaerobic settling tank in this order. The disposer wastewater is separately subjected to methane fermentation treatment in a digestion tank to be separated into digested sludge and separated water. The separated water is joined to the above general wastewater, and purified through a three-phase coexistence tank and a fish breeding tank. In the three-phase coexistence tank, oxygen concentration gradient is formed from the upper layer to the lower layer to form a three-phase coexistence condition for aerobic bacteria, anaerobic bacteria, and facultative aerobic bacteria, which decomposes small molecular organic matter and inorganic salts, and deodorized malodorous substance, such as ammonia and hydrogen sulfide, generated by the anaerobic bacteria. In the breeding tank, plant rearing and fish breeding consume nitrates and phosphates to reduce the treatment load of an existing sewage treatment facility. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
