Optimization of Fenton process using response surface methodology and analytic hierarchy process for landfill leachate treatment

Autor: Nader Biglarijoo, Simin Moavenzadeh Ghaznavi, Majid Ehteshami, Seyed Ahmad Mirbagheri
Rok vydání: 2016
Předmět:
Zdroj: Process Safety and Environmental Protection. 104:150-160
ISSN: 0957-5820
Popis: Typically, to treat landfill leachate, biological techniques alone are not sufficient. In this study, Fenton process was found to be effective as a pretreatment method. Analytic hierarchy process (AHP) was used to select the favorable catalyst between FeSO 4 and FeCl 2 when three criteria, namely, (i) COD removal, (ii) sludge to iron ratio, and (iii) risk were considered. Meanwhile, response surface methodology was applied to model and optimize three target responses, (i) COD removal, (ii) sludge to iron ratio, and (iii) organic removal to sludge ratio. The effective variables included pH, [H 2 O 2 ]/[Fe 2+ ], Fe 2+ dosage and reaction time. In addition, to minimize the danger, generated sludge was reused in the Fenton process. According to AHP sensitivity analysis results, priority percentage for FeCl 2 and FeSO 4 were 64% and 36%, respectively. Additionally, according to the statistical analysis, all suggested models were adequate (with R 2 of 0.9171–0.9617). The optimum condition was found to be pH = 6, [H 2 O 2 ]/[Fe 2+ ] = 20 mole ratio, [Fe 2+ ] = 170 mM, and reaction time = 105 min . Results showed that [H 2 O 2 ]/[Fe 2+ ] and [Fe 2+ ] are significant for COD removal while pH and [H 2 O 2 ]/[Fe 2+ ] were important factors for sludge to iron ratio (SIR) and organic removal to sludge ratio (ORSR), respectively. Meanwhile, when iron sludge was reused as catalyst, the results were acceptable even after five times regeneration.
Databáze: OpenAIRE
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