Treatment and remediation of a wastewater lagoon using microelectrolysis andmodified DAT/IAT methods
Qiong Wu , Tao Hua , Qixing Zhou
DOI:
Received March 20, 2010,Revised July 09, 2010, Accepted , Available online
Volume 23,2011,Pages 388-395
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To examine treatment and remediation of a wastewater lagoon with poor biodegradability, a typical wastewater lagoon in Tianjin,
China, was treated and remedied using microelectrolysis and modified demand aeration tank (DAT)/intermittent aeration tank (IAT)
methods. After pretreatment by microelectrolysis, the removal e ciency of chemical oxygen demand (COD) was up to 64.6% and
the ratio of BOC/COD in the e uent increased from 0.013 to 0.609. The removal rates of CODCr and NH+4 -N were a ected by sludge
backflow rate, mixed liquor suspended solids (MLSS), and hydraulic retention time (HRT) in the modified DAT/IAT reactor. The highest
removal rates of CODCr and NH+4 -N were up to 78.9% and 62.6%, respectively, when the sludge backflow rate was 38.0 mL/min, the
total HRT was 8.0 hr and MLSS was 4088.0 mg/L. In this case, some protozoa and metazoa were observed in activated sludge and
biofilm carriers. Most of chrominance was removed by microelectrolysis treatment, while the modified DAT/IAT methods were more
e ective for CODCr and NH+4 -N removal.
