| 摘要 |
<p>PROBLEM TO BE SOLVED: To treat organic waste water and organic waste easily and efficiently by effectively utilizing methane gas obtained by methane fermentation. SOLUTION: Night soil, waste water, from which residue has been removed, is caused to flow in by a biological treatment means 4 and waste water, from which residue has been removed, of a purification tank is caused to flow into a urine residue separation means 3. Raw liquid, which is solid-liquid separated by means of a solid-liquid separation means 3, is caused to flow into a biological treatment means 4 so as to be subjected to a biological digestion denitrification treatment together with night soil waste water, and excess sludge is removed from the liquid, which liquid is returned to the means 3 and inorganic flocculant is added to separated water to remove aggregated sludge, so that treated water is obtained. Solid waste is crushed and mixed with solids from the means 3 to perform a methane fermentation treatment, following which fermented material and aggregated sludge are agitated and mixed at pH 5-5.5, whereby aggregation is effected again by the aggregating action of remaining aggregated sludge. After solid-liquid separation by a second solid-liquid separation means 16, separated liquid is returned to the means 4 and separated solids are treated separately.</p> |
