TY - JOUR
T1 - Biodegradability assessment of ozonated raw and biotreated pharmaceutical wastewater
AU - Arslan-Alaton, I.
AU - Akmehmet Balcioglu, I.
PY - 2002/11
Y1 - 2002/11
N2 - The activated sludge specific oxygen uptake rate (SOUR) and BOD5/COD ratios of biologically pretreated pharmaceutical wastewater were analyzed and compared to assess relative changes in biotreatability during ozonation at a rate of 7.4 g/(L × h) for 4 h. An appreciable COD removal (41%) was achieved by the initial biological treatment process, whereas ozonation was more effective in reducing the UV-sensitive aromatic compounds present in the pretreated effluent. Sequential treatment using activated sludge + ozonation processes resulted in an average COD removal efficiency of 48%, and a proceeding biotreatment stage increased the overall COD removal to 53%. An optimum ozone dose in the range of 1,8543,708 mg/L corresponding to a specific ozone input rate of 0.23-0.46 mg O3/mg CODo existed where SOUR (3.7 × 10-3 mg O2/[mg MLSS × min] for ozonation at pH 8) and BOD5/ COD (0.57) as well as the proceeding biological COD removal yield YCOD (average 8 mg COD/mg MLSS) exerted maximum values.
AB - The activated sludge specific oxygen uptake rate (SOUR) and BOD5/COD ratios of biologically pretreated pharmaceutical wastewater were analyzed and compared to assess relative changes in biotreatability during ozonation at a rate of 7.4 g/(L × h) for 4 h. An appreciable COD removal (41%) was achieved by the initial biological treatment process, whereas ozonation was more effective in reducing the UV-sensitive aromatic compounds present in the pretreated effluent. Sequential treatment using activated sludge + ozonation processes resulted in an average COD removal efficiency of 48%, and a proceeding biotreatment stage increased the overall COD removal to 53%. An optimum ozone dose in the range of 1,8543,708 mg/L corresponding to a specific ozone input rate of 0.23-0.46 mg O3/mg CODo existed where SOUR (3.7 × 10-3 mg O2/[mg MLSS × min] for ozonation at pH 8) and BOD5/ COD (0.57) as well as the proceeding biological COD removal yield YCOD (average 8 mg COD/mg MLSS) exerted maximum values.
UR - http://www.scopus.com/inward/record.url?scp=0036840541&partnerID=8YFLogxK
U2 - 10.1007/s00244-002-1235-y
DO - 10.1007/s00244-002-1235-y
M3 - Article
C2 - 12399913
AN - SCOPUS:0036840541
SN - 0090-4341
VL - 43
SP - 425
EP - 431
JO - Archives of Environmental Contamination and Toxicology
JF - Archives of Environmental Contamination and Toxicology
IS - 4
ER -
