Mechanism and Parameter Optimization of Fenton’s Reagent Integrated with Surfactant Pretreatment to Improve Sludge Dewaterability
Autor: | Zhiqiang Wang, Li Yifei, Yi Xing, Qiang Yang, Feng Lihui, Mengmeng Jia, Chen Hong |
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Rok vydání: | 2017 |
Předmět: |
Surfactants
0208 environmental biotechnology Glycobiology lcsh:Medicine 02 engineering and technology 010501 environmental sciences Sludge Biochemistry Polynomials 01 natural sciences chemistry.chemical_compound Bound water lcsh:Science Acetic Acid Liquid Chromatography Multidisciplinary Sewage Chromatographic Techniques Chemistry Organic Acids Physical Sciences Benzalkonium Compounds Fenton's reagent Research Article Materials by Structure Iron Materials Science Research and Analysis Methods Water Purification Surface-Active Agents Acetic acid Hydrolysis Extracellular polymeric substance Polysaccharides Response surface methodology Materials by Attribute 0105 earth and related environmental sciences Behavior lcsh:R Chemical Compounds Biology and Life Sciences Hydrogen Peroxide High Performance Liquid Chromatography 020801 environmental engineering Algebra chemistry Chemical engineering Reagent Conditioned Response lcsh:Q Ammonium chloride Acids Mathematics |
Zdroj: | PLoS ONE, Vol 12, Iss 1, p e0169523 (2017) PLoS ONE |
ISSN: | 1932-6203 |
Popis: | Sludge dewatering can effectively reduce the volume and mass of sludge for subsequent treatment and disposal. The work validated the potential of Fenton's reagent combined with dodecyl dimethyl benzyl ammonium chloride (DDBAC) in improving sludge dewaterability and proposed the mechanism of joint conditioning. The composite conditioner dosage was optimized using response surface methodology. Results indicated the good conditioning capability of the composite conditioners. The optimum dosages for H2O2, Fe2+, and DDBAC were 44.6, 39.6, and 71.0 mg/g, respectively, at which a sludge cake water content of 59.67% could be achieved. Moreover, a second-order polynomial equation was developed to describe the behavior of joint conditioning. Analysis of the reaction mechanism showed that Fenton oxidation effectively decomposed extracellular polymeric substance (EPS), including loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS), into dissolved organics, such as proteins and polysaccharides. The process facilitated the conversion of the bound water into free water. Furthermore, DDBAC further released the bound water through solubilization of TB-EPS and LB-EPS after the Fenton reaction. The bound water content of the sludge conditioned with Fenton's reagent decreased from 3.15 to 1.36 g/g and further decreased to 1.08 g/g with the addition of DDBAC. High-performance liquid chromatography analysis verified that the composite conditioning could oxidize and hydrolyze EPS into low-molecular-mass organics (e.g., formic and acetic acid), thereby facilitating the release of bound water. |
Databáze: | OpenAIRE |
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