Dewatering of drinking water treatment sludge using the Fenton-like process induced by electro-osmosis

Xu, Hang; Shen, Kunlun; Ding, Tonggang; Cui, Jianfeng; Ding, Mingmei; Lu, Chunhui

doi:10.1016/j.cej.2016.02.025

Cited by 37 publications

(7 citation statements)

References 47 publications

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“…The rising intensity of the main bands after EF pretreatment can be explained by the increase in reducing sugar (C=O carboxyl functions) and protein (NH 2 amine functions) concentrations which are released into the supernatant after cell lysis. The appearance of new peaks observed around 1100-950 cm −1 has been attributed to polysaccharides by Naumann et al [33]. In the present case, these polysaccharides are released from exopolymers (EPS) dissociated during the disintegration of WAS.…”

Section: Discussionsupporting

confidence: 63%

High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

et al. 2020

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Anaerobic digestion (AD), being the most effective treatment method of waste activated sludge (WAS), allows for safe disposal. The present study deals with the electro-Fenton (EF) pretreatment for enhancing the WAS biogas potential with low-cost iron electrodes. The effect of pretreatment on the physicochemical characteristics of sludge was assessed. Following EF pretreatment, the pH, conductivity, soluble chemical oxygen demand (SCOD), and volatile fatty acids (VFA) increased to 7.5, 13.72 mS/cm, 4.1 g/L, and 925 mg/L, respectively. Capillary suction time (CST) analysis highlighted the dewaterability effect of EF on WAS, as demonstrated by the decrease in CST from 429 to 180 s following 30 min of pretreatment. Batch digestion assays presented an increase in the biogas yield to 0.135 L/g volatile solids (VS) after 60 min of EF pretreatment in comparison to raw sludge (0.08 L/g VS). Production of biogas was also found to improve during semi-continuous fermentation of EF-pretreated sludge conducted in a lab-scale reactor. In comparison to raw sludge, EF-pretreated sludge produced the highest biogas yield (0.81 L biogas/g VS) with a high COD removal rate, reaching 96.6% at an organic loading rate (OLR) of 2.5 g VS/L. d. Results revealed that the EF process could be an effective WAS disintegration method with maximum recovery of bioenergy during AD.

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Section: Discussionsupporting

confidence: 63%

High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

et al. 2020

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“…3 It is generally difficult to dewater WAS due to the fact that highly hydrated and negatively charged extracellular polymeric substances (EPS) exert determinate effects on the colloid stability of microbial aggregation and bind a large volume of water, i.e., bound water, within the sludge flocs. 4 As options to improve the WAS dewaterability, ultrasonic treatment, 5 microwave treatment, 6 electrolysis, 7 and oxidative treatment 8,9 have been suggested to destruct the stability of the WAS colloidal system and release the interstitial or intracellular water. Particularly, the oxidative treatment represented by various advanced oxidation processes (AOPs) has been widely applied for enhanced WAS dewatering because of its excellent performance in disrupting rigid cell membranes and simultaneously destructing EPS in WAS.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As options to improve the WAS dewaterability, ultrasonic treatment, microwave treatment, electrolysis, and oxidative treatment , have been suggested to destruct the stability of the WAS colloidal system and release the interstitial or intracellular water. Particularly, the oxidative treatment represented by various advanced oxidation processes (AOPs) has been widely applied for enhanced WAS dewatering because of its excellent performance in disrupting rigid cell membranes and simultaneously destructing EPS in WAS.…”

Section: Introductionmentioning

confidence: 99%

Occurrence State and Molecular Structure Analysis of Extracellular Proteins with Implications on the Dewaterability of Waste-Activated Sludge

Horvat

et al. 2017

Environ. Sci. Technol.

198

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The occurrence state and molecular structure of extracellular proteins were analyzed to reveal the influencing factors on the water-holding capacities of protein-like substances in waste-activated sludge (WAS). The gelation process of extracellular proteins verified that advanced oxidation processes (AOPs) for WAS dewaterability improvement eliminated the water affinity of extracellular proteins and prevented these macromolecules from forming stable colloidal aggregates. Isobaric tags for relative and absolute quantitation proteomics identified that most of the extracellular proteins were originally derived from the intracellular part and the proteins originally located in the extracellular part were mainly membrane-associated. The main mechanism of extracellular protein transformation during AOPs could be represented by the damage of the membrane or related external encapsulating structure and the release of intracellular substances. For the selected representative extracellular proteins, the strong correlation (R > 0.97, p < 0.03) between the surface hydrophilicity index and α-helix percentages in the secondary structure indicated that the water affinity relied more on the spatial distribution of hydrophilic functional groups rather than the content. Destructing the secondary structure represented by the α-helix and stretching the polypeptide aggregation in the water phase through disulfide bond removal might be the key to eliminating the inhibitory effects of extracellular proteins on the interstitial water removal from WAS.

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“…After a series of treatments, the landfill sludge can be recycled, such as soil improvement, nursery planting, and fertilizer preparation. At this stage, most of the treated sludge was used for construction applications, and it can be widely used for ground improvement [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influencing Factors of Treatment of Landfill Sludge Using Vacuum Preloading with the Fenton Reagent

Song

et al. 2021

Geofluids

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At present, there is a lack of necessary technical parameters for sludge vacuum reinforcement. To explore the effects of the drain board type on sludge vacuum reinforcement, the Fenton reagent was used to pretreat the landfill sludge in a sludge landfill area in Shanghai, and then, vacuum preloading contrast tests of different prefabricated vertical drainage types were carried out. During the test, the discharge and settlement of sludge were recorded. After the test, the moisture content, shear strength, and appearance of PVD were measured and analysed. The main conclusions are as follows: (1) the optimum ratio of H2O2 and Fe2+ is 2 for the landfill sludge; (2) the total displacement and accumulated settlement of the test group with integral prefabricated vertical drainage are 1.7 times and 1.2 times those of the separate prefabricated vertical drainage, respectively; (3) the type of prefabricated vertical drainage has no effect on the distribution of water content and shear strength; and (4) when the sludge is vacuum strengthened, the integral prefabricated vertical drainage should be preferred.

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Dewatering of drinking water treatment sludge using the Fenton-like process induced by electro-osmosis

Cited by 37 publications

References 47 publications

High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

Occurrence State and Molecular Structure Analysis of Extracellular Proteins with Implications on the Dewaterability of Waste-Activated Sludge

Experimental Study on the Influencing Factors of Treatment of Landfill Sludge Using Vacuum Preloading with the Fenton Reagent

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