High Density Conditioning of Activated Sludge by Addition of Wasted Diatomaceous Earth

Bench-scale continuous activated sludge experiment was carried out to investigate the promotion of binding imobilization and the high density shudge conditioning by addition of the diatomaceous earth.It was shown that the spherical and uniformal floc, of which average diameter was about 70μm, were adjusted and the high density sludge conditioning was promoted by the diatomaceous earth. It was suggested that the coagulation and/or density of sludge were improved by dle diatomaceous earth. Therefore, the diatomaceous earth was concluded to be very effective as a immobilization carrier.The addidonal effects of the diatomaceous earth were discussed from the practical point of the waste reuse.