| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treatment system of drainage in which generation of offensive odor and discharge of sludge are not almost caused. SOLUTION: In the cleaning system of drainage by functions of microorganisms, microorganism treatment is performed by using anaerobic and facultative anaerobic microorganisms. Thereafter, drainage is treated by an aeration treatment mechanism 6 and furthermore supernatant liquid and sludge of a separation treatment mechanism 8 are returned to an agitation- anaerobic treatment mechanism 4 in which these are agitated together with drainage raw water and anaerobic treatment is performed. Furthermore, sludge of the separation treatment mechanism 8 is blackened or darkened, or modified until the reduction potential becomes minus. This modified sludge is returned and treatment of drainage is performed.</p> |
