Roles of iron species and pH optimization on sewage sludge conditioning with Fenton's reagent and lime

Yu, Wenbo; Yang, Jiakuan; Shi, Yafei; Song, Jian; Shi, Yao; Xiao, Jun; Li, Chao; Xu, Xinyu; Shu, He; Liang, Sha; Xu, Wu; Hu, Jingping

doi:10.1016/j.watres.2016.03.016

Cited by 229 publications

(56 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many studies have found that sludge dewaterability strongly relates to the concentrations of protein‐like substances and polysaccharides . As described above, massive EPS dissolution enhanced sludge dewatering . Thus, iron salt coagulants improved sludge dewaterability more than aluminium coagulants.…”

Section: Resultsmentioning

confidence: 92%

“…34,35 As described above, massive EPS dissolution enhanced sludge dewatering. 27 Thus, iron salt coagulants improved sludge dewaterability more than aluminium coagulants. Table 4 shows that when exposed to the aluminium coagulants treatment, strong positive correlations were seen between SRF and DOC, PN, and PS concentrations in the LB-EPS and TB-EPS (R > 0.6, р < 0.01).…”

Section: Changes In Eps Organic Compositionmentioning

confidence: 99%

“…25 Ferric ions are also important for maintaining the floc structure, because they form bonds with polymers in the sludge matrix, likely by binding to carboxyl and hydroxyl groups. 26 Yu et al 27 reported that tight and strong flocs form dewatering channels more easily. In other words, the compact ferric flocs help improve sludge dewaterability.…”

Section: Aluminium Vs Iron Salts For Sludge Dewatering Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Liang

Zhang

Huang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND Extracellular polymeric substances (EPS) play an important role in sludge dewatering. Inorganic coagulants treatment has been widely used to remove the EPS and improve sludge dewaterability. This research evaluates whether there are advantages of selecting one of two chemical coagulation pretreatments, conventional aluminium or iron salts, over the other to enhance sludge dewaterability. The study traced variations in EPS characteristics to understand the mechanisms of sludge dewaterability. RESULTS The results showed that iron coagulants improved dewatering more than aluminium coagulants, by approximately 28.66%. The improved sludge dewaterability was further confirmed in pilot‐scale experiments. Compared with aluminium salts conditioning, iron salts were better able to neutralize stronger charge, formed smaller and more compact flocs, and had a stronger acidification effect. Sludge dewaterability was significantly related to EPS concentrations (i.e. the protein and polysaccharides), EPS composition (i.e. tyrosine/tryptophan amino acid, tyrosine/tryptophan protein, and polysaccharide), and functional groups (i.e. random coil, β‐sheet, and Npr) in the loosely bound EPS (LB‐EPS). A two‐step mechanism was proposed for the iron conditioning process. Moreover, the economic analysis shows iron treatment was more economical than that of aluminium. CONCLUSION Iron salts conditioning removed more LB‐EPS than aluminium salts, thus more significantly improving sludge dewaterability. © 2018 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Changes In Eps Organic Compositionmentioning

confidence: 99%

Section: Aluminium Vs Iron Salts For Sludge Dewatering Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Liang

Zhang

Huang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…·OH can decompose organic matter and rupture microbial cells [5,6]. Researchers [7–10] have concluded that Fenton’s reagent can improve sludge dewaterability. Liu et al [7] demonstrated that 84% specific resistance to filtration (SRF) reduction efficiency was achieved when 20 mg/g Fe 2+ and 125 mg/g H 2 O 2 were added to the sludge.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al [7] demonstrated that 84% specific resistance to filtration (SRF) reduction efficiency was achieved when 20 mg/g Fe 2+ and 125 mg/g H 2 O 2 were added to the sludge. Moreover, their studies [8–10] reported that the addition of Fenton’s reagent increases the extracellular polymeric substance (EPS) concentration in the sludge supernatant, leading to significant effects on sludge dewatering performance.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Parameter Optimization of Fenton’s Reagent Integrated with Surfactant Pretreatment to Improve Sludge Dewaterability

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Near‐infrared Light‐accelerated Glucose Oxidase‐MoS₂ Cascade Catalytic Chemodynamic Therapy in Synergistic Cationic Polymer Hydrogels to Combate Multibacterial Infection

Zhang

Xiao

Dong

2023

Chemistry An Asian Journal

View full text Add to dashboard Cite

Given the poor antibacterial activity of hydrogels, a multimodal synergistic antibacterial hydrogel based on dopamine-modified oxidized hyaluronic acid was developed, and its antibacterial activity and biocompatibility were demonstrated. First, dopamine-modified oxidized hyaluronic acid (OHA-DA) was used as the hydrogel backbone. A dualdynamically cross-linked injectable hydrogel was constructed by mixing OHA-DA, Fe 3 + with cationic antimicrobial peptide polylysine (EPL) via Schiff base and coordination complexation. Next, glucose oxidase-loaded MoS 2 nanosheets were synthesized through electrostatic interaction and loaded into the hydrogel through physical mixing. Finally, a multimodal synergistic antibacterial hydrogel OD/EPL/GM was obtained. Antibacterial experiments show that the hydrogel has good antibacterial activity against E. coli and S. aureus, and the antibacterial rate can reach 99.99%.

show abstract

Roles of iron species and pH optimization on sewage sludge conditioning with Fenton's reagent and lime

Cited by 229 publications

References 37 publications

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Mechanism and Parameter Optimization of Fenton’s Reagent Integrated with Surfactant Pretreatment to Improve Sludge Dewaterability

Near‐infrared Light‐accelerated Glucose Oxidase‐MoS₂ Cascade Catalytic Chemodynamic Therapy in Synergistic Cationic Polymer Hydrogels to Combate Multibacterial Infection

Contact Info

Product

Resources

About

Roles of iron species and pH optimization on sewage sludge conditioning with Fenton's reagent and lime

Cited by 229 publications

References 37 publications

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Comprehensive insights into the inorganic coagulants on sludge dewatering: comparing aluminium and iron salts

Mechanism and Parameter Optimization of Fenton’s Reagent Integrated with Surfactant Pretreatment to Improve Sludge Dewaterability

Near‐infrared Light‐accelerated Glucose Oxidase‐MoS2 Cascade Catalytic Chemodynamic Therapy in Synergistic Cationic Polymer Hydrogels to Combate Multibacterial Infection

Contact Info

Product

Resources

About

Near‐infrared Light‐accelerated Glucose Oxidase‐MoS₂ Cascade Catalytic Chemodynamic Therapy in Synergistic Cationic Polymer Hydrogels to Combate Multibacterial Infection