Anuchid Zummapetcharat. Combining domestic wastewater with fruit canning industrial wastewater for nutrient removal in shorten operating cycle of an anaerobic sequencing batch reactor (AnA2/O2SBR) . Master's Degree(Environmental Technology). Mahidol University. : Mahidol University, 2004.
Combining domestic wastewater with fruit canning industrial wastewater for nutrient removal in shorten operating cycle of an anaerobic sequencing batch reactor (AnA2/O2SBR)
Abstract:
This research determined the efficiency of screening the optimum fill pattern of
wastewater, and shortening the operating cycle of an anaerobic sequencing batch reactor
(AnA2/O2 SBR) for removal of chemical oxygen demand (COD), total kjeldahl nitrogen
(TKN) and total phosphorus (TP) from domestic wastewater. The experiments were grouped
into two parts, both evaluated the removal efficiency of AnA2/O2 SBR in treating domestic
wastewater. Firstly, a comparison of the filling wastewater during the anaerobic fill-time and
second anoxic time, with a ratio of 4:1, and normal anaerobic fill-time, was studied. The
domestic wastewater was adjusted to have the COD:TKN ratio of 5.2:1, 8:1, and 10:1.
Results showed that COD, TKN and TP removal efficiency values were in the range of
94.41%-97.54%, 96.15%-97.39% and 32.77%-97.94%, respectively. Secondly, an addition of
the fruit canning industry wastewater as a carbon source was adjusted to a COD:TKN ratio of
10:1, whereas the cycle time and the solid retention time (SRT) were kept at 8 hours and 60
days, respectively. The experimental research was assigned as a 32 factorial design with
3 levels for the first anoxic time (60, 80 and 100 min.) and 3 levels for the first oxic time
(100, 120 and 140 min.). Results showed that COD, TKN and TP removal efficiency values
were in the range of 95.59%-97.27%, 78.60%-95.58% and 58.70%-98.40%, respectively.
The COD, TKN and TP removal efficiencies in the first experiments showed normal
anaerobic fill time were significantly higher than those under fill-time and second anoxic filltime
(p<0.05). The second experiments showed the COD, TKN and TP removal efficiencies
increased when the first anoxic time was increased from 60 to 80 and 100 min. (p<0.05). The
COD, TKN and TP removal efficiencies increased when the first oxic time was increased
from 100 to 120 and 140 min. (p<0.05). It was suggested that the optimum running condition
of the AnO²/O² SBR to treat domestic wastewater is at a first anoxic time of 100 min. and a
first oxic time of 120 min. which yielded the average COD, TKN and TP removal efficiencies
of 96.79%, 95.03% and 97.26%, respectively.