Keywords :
Safety, Risk, Reliability and Quality; General Chemical Engineering; Environmental Chemistry; Environmental Engineering
Abstract :
[en] Wastewater from the Antibiotical-Saidal pharmaceutical plant (Medéa) was pretreated by
coagulation-flocculation using copper sulfate (CuSO4), iron chloride (FeCl3), and mixture
of the two salts combined in a 1:1 (v/v) ratio in the present study. Response surface
methodology (RSM) was used to optimize pH and coagulant dosage as independent
variables, while dissolved organic carbon (DOC), absorbance at 254 nm (UV 254), and
turbidity were provided as dependent variables in the central composite design (CCD).
Then, the databases of the three treatments were combined in a single database to create a
general model valid for the three treatments at the same time, and to predict the reduction
rates of DOC, UV254, and turbidity, using the Gaussian process regression coupled with
the dragonfly optimization algorithm (GPR-DA).
To have the best model obtained between RMS and GPR-DA, an experimental validation
was carried out after having had the optimal conditions of each type of coagulant, using the
multi-objective optimization technique. The results of the experimental validation show the superiority of the GPR-DA model compared to the RSM model. Also, the results show that the mixed coagulant (CuSO4+ FeCl3) obtain better results than CuSO4 or FeCl3 alone with a treatment efficiency equal to 92.68% at pH = 5 and dosage = 600 mg/L, and the
reductions in DOC, UV 254 and turbidity are 97.32%, 82.90% and 96.47%, respectively.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
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