Role of intermittent aeration in domestic wastewater treatment by submerged membrane activated sludge system


Hasar H., Kinaci C., Unlu A., Ipek U.

DESALINATION, cilt.142, ss.287-293, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 142 Konu: 3
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0011-9164(02)00209-6
  • Dergi Adı: DESALINATION
  • Sayfa Sayıları: ss.287-293

Özet

In this study, the treatment of domestic wastewater in a lab-scale submerged membrane activated sludge system (sMBR) was investigated under different aeration intervals. The COD concentration of the system effluent varied generally between 5 and 25 mg/l and the COD removal at the organic loads of 0.6-0.8 kg COD/m(3)d was observed to be above 98%. The total phosphorus content of the filtrate was decreased to a level that was less than 1 mg/l under the aerobic conditions in which the aeration was continuously made. A dramatic increase in the total phosphorus content of filtrate was observed under the aerobic + anoxic conditions in which the aeration was made at differential intervals. The filtrate was free of suspended solid (SS) and total coliform bacteria and a percent removal of 100 was achieved in terms of these parameters. The influent turbidity removal was 97-99.8%. Generally, the removal of total Kjeldahl nitrogen (TKN) and ammonium nitrogen varied in the ranges of 87.8-99.1% and in the ranges of 89.4-99.8%, respectively. While the nitrate concentrations in the filtrate increased to 26.8 mg/l under the aerobic conditions, it was determined that this value was decreased to 2.4 mg/l under the aerobic + anoxic conditions.