Before ZVI process was combined, the biofilm reactor system for
coking wastewater treatment has been continuously operated for
about 1 year. In the integrated system, HRT for each biofilm reactor
was adjusted to 15 h and the total HRT for the biofilm system was
45 h. In Reactor ZVI, 3–6 l of the biological effluent was retained
for reaction and the excess effluent was discharged. Furthermore,
recirculation of ZVI effluent to Reactor A was employed with the
ratio adjusted to 3. Moreover, the produced sludge in Reactor ZVI
was removed every 2 weeks. In this study, the effluent quality of
each reactor was detected every 2 or 3 days continuously.
To study the stability of the integrated system against the sudden
loading shock of the influent variation, the concentrations of COD
and NH3-N in the influent were increased to a jump change to about
10,000 and 1200 mg l−1 for 24 h. Then, the influent was returned to
the normal level and the effluent quality was detected to examine
the recovery ability of the integrated system.
Before ZVI process was combined, the biofilm reactor system forcoking wastewater treatment has been continuously operated forabout 1 year. In the integrated system, HRT for each biofilm reactorwas adjusted to 15 h and the total HRT for the biofilm system was45 h. In Reactor ZVI, 3–6 l of the biological effluent was retainedfor reaction and the excess effluent was discharged. Furthermore,recirculation of ZVI effluent to Reactor A was employed with theratio adjusted to 3. Moreover, the produced sludge in Reactor ZVIwas removed every 2 weeks. In this study, the effluent quality ofeach reactor was detected every 2 or 3 days continuously.To study the stability of the integrated system against the suddenloading shock of the influent variation, the concentrations of CODand NH3-N in the influent were increased to a jump change to about10,000 and 1200 mg l−1 for 24 h. Then, the influent was returned tothe normal level and the effluent quality was detected to examinethe recovery ability of the integrated system.
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