Phajongjit Kasawayut. The effects of fill-times and fill-patterns on the removal efficiency of organics and nutrients from slaughterhouse wastewater using an Anaerobic Sequencing Batch Reactor (AnA2/O2SBR) systems . Master's Degree(Environmental Technology). Mahidol University. : Mahidol University, 2004.
The effects of fill-times and fill-patterns on the removal efficiency of organics and nutrients from slaughterhouse wastewater using an Anaerobic Sequencing Batch Reactor (AnA2/O2SBR) systems
Abstract:
This research aimed to investigate the effects of difference fill-times and fill-patterns on the
removal efficiency of COD (Chemical Oxygen Demand), TKN (Total Kjeldahl Nittrogen) and TP (Total
Phosphorus) from the slaughterhouse wastewater using an Anaerobic Sequencing Batch Reactor
(AnA2/O2 SBR) systems. The experimental research was designed as 3 similar lab-scales of AnA2/O2
SBR model. The experiments were divided into two major parts.
The first part, was to determine the optimum anoxic-oxic time II (1.5 and 2.5, 2.0 and 2.0, and 2.5
and 1.5 hours). It was found that the average COD removal efficiency and NO3
- (Nitrate) effluent
concentration at anoxic-oxic time II of 1.5 and 2.5 hours were significantly higher than those of anoxicoxic
time II of 2.5 and 1.5 hours (p<0.05). No significant differences of COD removal efficiency and NO3
-
effluent concentration were found between those of 1.5 and 2.5, and 2.0 and 2.0 hours anoxic-oxic time II
(p<0.05). The average TKN removal efficiency at anoxic-oxic time II of 1.5 and 2.5 hours was
significantly higher than that of anoxic-oxic time II of 2.0 and 2.0 hours and 2.5 and 1.5 hours (p<0.05).
No significant differences of TKN removal efficiency were found between those of 2.5 and 1.5, and 2.0
and 2.0 hours anoxic-oxic time II (p<0.05). The average TP removal efficiency at anoxic-oxic time II of
2.5 and 1.5 hours was significantly higher than that of anoxic-oxic time II of 1.5 and 2.5 hours (p<0.05).
No significant differences of TP removal efficiency were found between those of 2.5 and 1.5, and 2.0 and
2.0 hours anoxic-oxic time II.
The second part, were devived from a as 32 factorial design with three levels of fill-times (0.5, 1.0,
and 1.5 hours) and three levels of fill-patterns (static-fill, intermittent mix-fill, and continuous mix-fill).
This part was to determine optimum fill-times and fill-patterns. The average COD removal efficiency at
0.5 hours fill-times was significantly higher than at fill-times of 1.0 and 1.5 hours (p<0.05). No significant
differences of COD removal efficiency were found between those of 1.0 and 1.5 hours fill-times (p<0.05).
No significant differences of TKN and TP removal efficiencies were found between 0.5, 1.0 and 1.5 hours
fill-times (p<0.05). There were no significant differences with different fill-patterns in terms of COD
removal efficiency (static-fill, intermittent mix-fill, and continuous mix-fill) (p<0.05). The average TKN
and TP removal efficiencies at continuous mix-fill were significantly higher than those of static-fill and
intermittent mix-fill (p<0.05). No significant differences of TKN removal efficiency were found between
static-fill and intermittent mix-fill (p<0.05). The average TP removal efficiency at intermittent mix-fill was
significantly higher than at static-fill (p<0.05).
The first part of the experiment showed that the optimum running condition for the
slaughterhouse wastewater was anoxic-oxic time II of 2.5 and 1.5 hours. This yielded COD, TKN and TP
removal efficiencies of 97.87%, 98.24%, and 98.65%, respectively and NO3
- effluent concentration
of 9.13 mg/l. The optimum running condition for the slaughterhouse wastewater was a fill-time 0.5
hours and fill-pattern of continuous mix-fill which yielded COD, TKN and TP removal efficiencies also
of 98.18%, 98.20%, and 98.91%, respectively