| 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 and inorganic flocculant is added to remove aggregated sludge so that treated water is obtained, and the excess sludge and aggregated sludge are returned to the means 3. Solid waste is crushed and mixed with solids from the means 3 to perform a methane fermentation treatment, following which magnesium compound of 1 mole or less with respect to total amount of phosphorus is added in an alkaline side atmosphere of pH 7.5 or more. After solid-liquid separation by means of a second solid-liquid separation means 21, filtered liquid is returned to the means 3 to recover magnesium phosphate ammonium, in which fertilizing component has reacted.</p> |
