Dewaterability of sludge conditioned with surfactant DDBAC pretreatment by acid/alkali

Hong, Chen; Xing, Yi; Hua, Xueming; Si, Yanxiao; Qiao, Gang; Wang, Zhiqiang

doi:10.1007/s00253-015-6451-2

Cited by 11 publications

(11 citation statements)

References 40 publications

(36 reference statements)

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“…After that, sludge dewatering performance was almost unchanged. The results coincided with those in our previous studies [18,19]. Thus, the optimum DDBAC dosage is approximately 60 mg/g.…”

Section: Resultssupporting

confidence: 92%

“…After the Fenton reaction, the formic and acetic acid concentrations further increased with the addition of DDBAC. The results verified that the PN and PS in S-EPS were resolved into low-molecular-mass organics due to DDBAC hydrolysis, which was similar to the findings reported by Hong et al [18, 19] and Huang et al [33]. …”

Section: Resultssupporting

confidence: 90%

“…However, the effects of the cationic surfactant dodecyl dimethyl benzyl ammonium chloride (DDBAC) on sludge dewatering performance have been rarely investigated. Our previous studies [18,19] revealed that DDBAC can effectively release bound water from sludge because of its superior surface activity and strong adsorption/bridge capacities on sludge. Moreover, the application of Fenton’s reagent integrated with DDBAC during sludge conditioning has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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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.

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“…After that, sludge dewatering performance was almost unchanged. The results coincided with those in our previous studies [18,19]. Thus, the optimum DDBAC dosage is approximately 60 mg/g.…”

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

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“…However, with the further increase in CTAC dosage, W C and SRF both changed slightly. The similar phenomena were observed in the sludge treatment by dodecyl dimethyl benzyl ammonium chloride (DDBAC) (Hong, Xing, et al ), cetyl trimethyl ammonium bromide (CTAB) and CTAB with electrolysis pretreatment (Yuan et al ). Therefore, the suitable dosage for sludge treated by single CTAC was 120 mg/g.…”

Section: Resultssupporting

confidence: 59%

Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Liu

Zhang

et al. 2018

Water & Environment J

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In view of the merits of bioleaching and surfactant for sludge treatment, the possibility of surfactant with bioleaching pretreatment applied to improve sludge dewaterability was investigated in this work. The results showed that cetyl trimethyl ammonium chloride (CTAC) with bioleaching pretreatment was highly efficient in dewatering sludge. The optimal CTAC dosage and bioleaching pH for this combination were 120 mg/g (dry solids) and 3.55, respectively, under which the water content of filtrated cake was 68.94% and the specific resistance to filtration was 0.12 × 1013 m/kg with a reduction of 94.92%. Although CTAC and bioleaching both had positive effects on sludge dewatering, their combination was more efficient. The significant enhancement of sludge dewaterability was mainly contributed from the breakage and charge neutralization of sludge flocs, and the release of extracellular polymeric substances (EPS). In addition, the positive correlation between supernatant EPS concentration and sludge dewaterability was observed under experimental conditions.

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“…Thus, direct dewatering is difficult. To improve the efficiency of sludge dewatering, sludge conditioning is necessary prior to the dewatering of sewage sludge; it could change the morphology of sludge particles and reduce the SRF . Sludge conditioning could increase the sludge dewatering ability and improve the economic benefit of the subsequent treatment of sludge.…”

Section: Introductionmentioning

confidence: 99%

Effective sludge dewatering technique using the combination of Fenton's reagent and CPAM

et al. 2017

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In this study, the combination of Fenton's reagent and cationic polyacrylamide (CPAM) was used in sludge conditioning for the enhancement of sludge dewatering performance. The effects of CPAM, H2O2, and Fe2+ dosages and pH on the moisture content (MC) of the filter cake, the specific resistance of filtration (SRF), and the residual turbidity of the supernatant (RT) were investigated. To observe influencing mechanisms of sludge dewatering further, optical microscopy and scanning electron microscopy (SEM) were employed. Results demonstrated that the sludge dewatering performance obtained by the combination of Fenton's reagent and CPAM was significantly better than that obtained using Fenton's reagent or CPAM alone. The optimum conditions of sludge conditioning were as follows: 400 mg · L−1 Fe2+, 4 g · L−1 H2O2, 40 mg · L−1 CPAM, and pH 4. The SRF, MC, and RT at optimum conditions were reduced to minimum values of 1.06 × 1012 m/kg, 58.9 %, and 3.7, respectively. The optical microscopy and SEM analyses of sludge flocs confirmed that they were more conducive to sludge dewatering after the combination of Fenton oxidation and flocculation. The sludge dewatering results demonstrated that the combination of Fenton and flocculation process exhibited excellent performance in enhancing sludge dewatering and is a promising pretreatment approach to sludge disposal.

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Dewaterability of sludge conditioned with surfactant DDBAC pretreatment by acid/alkali

Cited by 11 publications

References 40 publications

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

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

Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Effective sludge dewatering technique using the combination of Fenton's reagent and CPAM

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