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Modelization and Statistical Optimization of Coagulation–Flocculation Treatment of an Old Leachate
Author(s) -
Lessoued Ridha,
Souahi Fatiha,
Pelaez Leonor C.
Publication year - 2017
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x14839994523703
Subject(s) - turbidity , chemical oxygen demand , response surface methodology , leachate , flocculation , central composite design , coagulation , chemistry , pulp and paper industry , environmental science , environmental engineering , environmental chemistry , chromatography , sewage treatment , biology , engineering , ecology , psychiatry , psychology
Coagulation/flocculation process was studied using the response surface methodology (RSM) and central composite design (CCD), to design the experiments, develop models, evaluate the relationship between operating factors (FeCl 3 dose [m] and pH), and provide an efficient method for the treatment of old leachates. The quadratic polynomial models developed for chemical oxygen demand (COD) and turbidity responses indicated that the optimum conditions were m of 0.82 g/L at pH 5.33 with coefficient of determination R 2 of 98.88 and 99.84%, and adjusted R 2 of 98.09 and 99.73% for both COD and turbidity. The experimental data and model predictions agreed well. Chemical oxygen demand, turbidity, lead and copper removal efficiency of 76.4, 98.9, 99 and 99%, respectively, were reached.