| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently perform a sewage treatment for livestock waste water, especially piggery waste water, normally without dilution. SOLUTION: This sewage treatment method is constituted in such a manner that the livestock waste water is sent to a primary treatment tank, pretreated and subsequently treated by membrane while being subjected to activated sludge treatment in a secondary treatment tank, the excess sludge in activated sludge is pumped and sent to a sludge concentrating storage tank. At this time, primary treated sewage in the primary treatment tank is treated by filtration while being separated by sedimentation, therein, the primary treated sewage which is treated by filtration is transferred to the secondary treatment tank and, at the same time, the deposited sludge which is settled is pumped and sent to the sludge concentrating storage tank. This sewage treatment device is provided with a solid-liquid separation tank in which the livestock waste water is treated by filtration while being separated by sedimentation, the sludge concentration storage tank in which the deposited sludge which is settled in the solid-liquid separation tank is pumped and stored, the secondary treatment tank in which the primary treated sewage which is treated by filtration in the solid-liquid separation tank is separated by membrane while being subjected to the activated sludge treatment and the sludge concentrating storage tank in which the excess sludge in the secondary treatment tank is pumped and stored.</p> |
