Effects of exposing slimes on ro tating disks
415
Nitrification normally proceeded at a rate of 2.2 mg/1 per stage or 22 mg/1 per hour
of contact with the slimes. Under the specific operating condition prevalent in the third
mode described above, nitrification proceeded at a rate of 76 mg/1 per hour of contact.
A portion of the effluents from all the above modes was subjected to treatment using
partially submerged, illuminated disks for the purpose of extracting nutrients from the
stream by synthesis into attached algal cells. The effluent from the algal unit was
subjected to adsorption of residual organics on packed beds of granular activated carbon.
The total leakage of organics through the system was 1.4 mg/1, all soluble, for all three
modes of operation, while the practical carbon exhaustion rate was in the range of 15 to
20 mg/1.
ACKNOWLEDGEMENTS
This investigation was supported by a grant from the Environmental Protection
Agency (WP-17010 EBM) to the Department of Environmental Sciences of Rutgers
University.
The cooperation and assistance given by Commissioner M. Feldman and Assistant
Commissioner M. Lang of the Environmental Protection Administration of New York
City, is gratefully acknowledged.
REFERENCES
1. TORPEY, W., HEUKELEKIAN, H., KAPLOVSKY, A.J., and EPSTEIN, R. "Rotating Disks with
Biological Growths Prepare Wastewater for Disposal or Reuse". Jour. Water Pollution Control
Federation, November 1971.
2. JENKINS, S.H., "Nitrification". Jour. Inst. of Water Pollution Control, Vol. 68, Part 6, pp. 610 -
618, 1969.
415
Nitrification normally proceeded at a rate of 2.2 mg/1 per stage or 22 mg/1 per hour
of contact with the slimes. Under the specific operating condition prevalent in the third
mode described above, nitrification proceeded at a rate of 76 mg/1 per hour of contact.
A portion of the effluents from all the above modes was subjected to treatment using
partially submerged, illuminated disks for the purpose of extracting nutrients from the
stream by synthesis into attached algal cells. The effluent from the algal unit was
subjected to adsorption of residual organics on packed beds of granular activated carbon.
The total leakage of organics through the system was 1.4 mg/1, all soluble, for all three
modes of operation, while the practical carbon exhaustion rate was in the range of 15 to
20 mg/1.
ACKNOWLEDGEMENTS
This investigation was supported by a grant from the Environmental Protection
Agency (WP-17010 EBM) to the Department of Environmental Sciences of Rutgers
University.
The cooperation and assistance given by Commissioner M. Feldman and Assistant
Commissioner M. Lang of the Environmental Protection Administration of New York
City, is gratefully acknowledged.
REFERENCES
1. TORPEY, W., HEUKELEKIAN, H., KAPLOVSKY, A.J., and EPSTEIN, R. "Rotating Disks with
Biological Growths Prepare Wastewater for Disposal or Reuse". Jour. Water Pollution Control
Federation, November 1971.
2. JENKINS, S.H., "Nitrification". Jour. Inst. of Water Pollution Control, Vol. 68, Part 6, pp. 610 -
618, 1969.