Effect Of The Temperature On
The Performance Of A Sludge Activated
Petrochemical Wastewater Treatment Plant
Author(s)
S. A. Martínez, M. Morales, M. Rodríguez, R. Aguilar
& D. Narváez
Abstract
Petrochemical Morelos is located in an industrial zone among 50 refineries and
petrochemical industries, in the coastal region of Mexico. All these industries
produce 111 Mm3/d of wastewaters which are discharged into the Coatzacoalcos
River, previous treatment in their wastewater plants. However, the high
temperatures in the region negatively affect the performance of the different
wastewater plants increasing the discharge of pollutants into the river during the
high temperatures in the year. Petrochemical Morelos has an activated sludge
system to treat its wastewater flow which is about 7000 m3/d. The aeration is
supplied by a fine bubble diffusers system. Four compressors supply the air to
the bioreactors. The high temperatures in the region and the compression effect
on the air supply cause the temperature of the air exiting from the compressor to
reach up to 82°C. As a direct consequence of the high air temperature, the
temperature in the bioreactor reaches 32oC during the fall, whereas in the spring
and summer, the bioreactor temperature reaches up to 41oC. The high
temperatures have an adverse effect on the microbial activity and affect the
performance of the biological process. In this study, the effect of temperature on
the process is considered. A dynamic model, based on actual operation data, was
validated at five scenarios presented during the year. The effect of temperature
on µmax, kla and kd, was incorporated in the mass balance equations of the model.
Moreover, the model is applied to find the operating space of the process at
different scenarios with the high temperatures, to reach the effluent quality
standards required by Mexican environmental laws.
Keywords: activated sludge, modelling, petrochemical, wastewater,
temperature.
Keywords
activated sludge, modelling, petrochemical, wastewater,
temperature.
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