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Hydrodynamic behaviour and its effects on the treatment performance of panelled anaerobic baffle-cum filter reactor
Renuka, R.; Mariraj Mohan, S. & Amal Raj, S.
Abstract
The aim of this paper was to present the influence
of hydraulic behaviour in the treatment of sewage
(domestic wastewater) using panelled anaerobic baffle-cum
filter reactor (PABFR). The PABFR has five compartments
of equal size in which the first three compartments operate
as anaerobic baffled reactor (ABR) followed by anaerobic
filters (AF). The combined reactor has a great potential for
its application due to its panelled structure and arrangement
of baffles inside each compartment. Hydrodynamic behaviour
of the reactor was determined by means of a pulse
tracer test and by calculating the residence time distribution
curves at different flow rates. At high flow rates [with
hydraulic retention time (HRT) < 4 h], the mixing pattern
in ABR showed a completely mixed type with a maximum
dead space of 14 % and as the flow decreased (HRT of 8
and 12 h), the ABR’s mixing behaviour was intermediate
between plug flow and completely mixed. In the case of
AF, as the flow increased, the dispersion was intermediate
between completely mixed and plug flow, and as the flow
rate decreased, the reactor became completely plug flow
with the dead space ranging between 2.2 and 7.4 %. On the
whole, PABFR treatment performance in terms of chemical
oxygen demand removal was 90, 89 and 64 % for 12-, 8-
and 4-h HRT, respectively, which clearly shows the correlation
between mixing and reactor process performance.
Thus, the outcome of this research in general highlights the
importance of hydrodynamic behaviour for a better operation
of the reactor.
Keywords
Residence time distribution; Hydrodynamic behaviour; Panelled anaerobic baffled reactor cum filter reactor
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