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
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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