2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
with perspective for 2036 follows also the dynamic effluent
standard values. It can be expected that upgraded WWTP will
meet current legislation also with regard to dynamics of the
processes.
The first task was to investigate what could happen if the
reconstruction in 2003 had not been carried out. The effluent
concentration values are shown in Table I. The load in 2007
and consequently the effluent concentration values are lower
than in 2002 due to industrial activities reduction. This result
could lead to the conclusion that there had been no need for
the reconstruction of the WWTP in 2003. However, because
of the more stringent requirements (Regulation of the Slovak
government, 2005) which permits 10.0 mg dm –3 for ammonium
nitrogen for effluent of WWTP with corresponding load,
it was necessary to carry out the reconstruction. Therefore, it
should be stressed that the WWTP without this reconstruction
would not be able to meet current effluent standards.
The second task was to study what would happen if the
pollution load of actual biological stage of the WWTP increased
to values expected in 2036. The results of dynamic simulations
show that even if the load will increase, the WWTP
will be able to meet current effluent requirements.
Table I
Results of simulations
WWTP 2002 1 st task WWTP 2007 2 nd task
plant layout 2002 2007
load situation 2002 2007 2007 2036
n-nH 4
[mg dm –3 ]
n-nO 3
[mg dm –3 ]
25.06 20.89 0.81 4.05
0 0 7.47 3.91
Conclusions
Two time-variable influent and effluent data sets of wastewater
flow and composition were measured for different
technological arrangements of the WWTP and were applied
for dynamic simulations.
It can be concluded from the work that the mathematical
model ASM1 is suitable for the description of the process
s354
dynamics of the WWTP biological stage. Good fit between
experimental and calculated effluent concentration values
resulted from performed dynamic simulations.
The results of dynamic simulation confirmed the necessity
of the WWTP reconstruction carried out in 2003 in order
to comply with actual legislation requirements.
Compliance with actual effluent limits follows for previous
steady state design and upgrading of the WWTP when
investigating dynamics of the process.
According to results of dynamic simulations it can be
expected that the existing WWTP will comply with actual
discharge standards also for pollution load as expected in
2036.
This work has been supported by the Slovak Grant
Agency for chemical and chemical-technological science
(Grant No. 1/0866/08). The authors would also like to
thank Ľubomír Krcho and Monika Polláková for the help by
acquirement influent, effluent and operational data from the
WWTP.
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