A Study On Effect Of Solid-liquid Separation In An Integrated Oxidation Ditch

The separator is core technology of the Integrated Oxidation Ditches, to seek for one measure to reinforce solid-liquid separator, the second settlement and Garrett process were combined in this test, together with existing solid-liquid separator's advantage. "Inside separator+ outside settlement" solid-liquid separator was tested.On the basis of prior study, several separator models were designed in the experiment. By testing the different kinds of separators, the Folded Plate solid liquid separator, which was applied in the middling scale project, was chose, because of its good effect.Many data show that the SS always were better than the standard as the MLSS,SVI,SOR changed continually. The SS less than 20mg/L account for 93.3%, less than 15mg/L account for 89.3%, less than 5mg/L account for 21.3%. These data indicate that this solid liquid separator has good solid liquid separating effect, together with good shock resistance.By observing and analyzing the phenomena in the middling scale project, influencing factors of the separation were determined, and some of them such as SOR,SVI,V and Component distance were chosen to make Orthogonal experiment. The result indicated that the influencing extent from deep to simple was V, SVI, Component distance, SOR. At the same time, the best Collocation was found, which is as follows:SOR of Inside solid-liquid Separator: 80m~3/m~2·d, SOR of Outside solid-liquid Separator: 48m~3/m~2·d SVI: 80mL/g, V: 0.3m/s, Component distance: 20cm.The return of separator was studied in this experiment. The result showed that return of sludge mainly took place in the back of solid liquid separator. The state of sludge return was better as to be the end.