Dewaterability and energy consumption model construction by comparison of electro-dewatering for industry sludges and river sediments

Pan, Wei‐Ping; Pi, Kewu; Shi, Yafei; Li, Pian; Zheng, Wei; Zhang, Huiqin; Liu, Defu; Gerson, Andrea R.

doi:10.1016/j.envres.2020.109335

Cited by 24 publications

(5 citation statements)

References 51 publications

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“…Among them, the physical methods include plate-frame pressure ltration, centrifugation, geotextile bag dehydration, etc., and the chemical methods include coagulation, electrochemistry, surfactants, acid-base dehydration. [10][11][12][13] The water in dredged sediment consists of free water and bound water. 14 Given the complex composition of sediment and its difficulty in dewatering, the physical methods oen only remove a portion of the free water in the sediment.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive assessment of enhancing dewaterability of dredged sediments by starch-based flocculant

Tang,

Huang,

Chen

et al. 2024

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

“…Chemical processes can promote the conversion of bound water to free water, thereby removing some of the bound water. 10 In general, a combination of physical and chemical methods yields higher dewatering efficiency. Coagulation is one of the most mature chemical dehydration methods.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive assessment of enhancing dewaterability of dredged sediments by starch-based flocculant

Tang,

Huang,

Chen

et al. 2024

RSC Adv.

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“…Heating excess sludge can effectively foster the dissolution of a large number of organic substances in microbial cells, making the microbe cells bigger and increasing the pore size of the cell membranes, which facilitates the transfer of a large amount of organic matter in microbial cells to the liquid phase for it to become soluble organic matter (Wu et al, 2020). When the alkali is added, the hydroxyl ion (OH -) plays a key role in destroying sludge flocs.…”

Section: Introductionmentioning

confidence: 99%

Application of a Mathematical Model for Sludge Reduction in Pharmaceutical Wastewater

2022

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Excess sludge treatment is indispensable in sewage treatment plants. This study aims to reduce the excess material from activated sludge and establish a mathematical model. Sludge dissolution rates were calculated by measuring the total chemical oxygen demand (TCOD) and the soluble COD (SCOD) with regard to water quality before and after pretreatment. Then, sludge reduction effects were obtained by means of the suspended solid (SS) changes. The major impact factors on sludge dissolution rates were evaluated, such as pH, temperature, potassium ferrate amount, and reaction time, among others. The response surface method of the Design-Expert V8.0.6.1 software was adopted to analyze the sludge dissolution rate, which represents the sludge reduction effect. By regulating the different constraint factors, the Design-Expert model showed that the sludge dissolution rate reached the highest value of 54,36% at a temperature of 21,58 oC and a pH of 4, as well with a potassium ferrate dosage of 1 mg/g SS and a reaction time of 4,07 hours with constant stirring. A mathematical model for the sludge dissolution rate that considers temperature, pH, potassium ferrate dosage, reaction time, and stirring condition was established, and the simulated R2 value of 0,72 indicated a relatively acceptable fitting effect.

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“…However, some problems do exist with this approach, mainly including restricting the development or large-scale application, such as electrode corrosion, ohmic heating (Energy dissipation) and high electric resistance at terminal stage of dewatering (Dewatering limits) 14 , 15 . It was pointed out that the ohmic heat in sludge electro-dewatering process was the main energy loss 16 , so a large number of literatures reported how to reduce the ohmic heat to avoid sludge temperature increment in electro-dewatering process 17 , 18 . Optimizing parameters with bench-scale, pilot-scale and industrial-scale experiments, Zhang et al pointed out that when the anode processing capacity was 41 kg m −2 h −1 , energy consumption was controlled at about 70 kWh t −1 sludge, and the sludge water content can be reduced to below 60 wt% 19 .…”

Section: Introductionmentioning

confidence: 99%

“…Although sludge water content can be reduced to below 60 wt% by sludge electro-dewatering within 5–20 min, its dewatering limit still restricts further deep dewatering of sludge 9 , 18 . If the sludge water content was continue to be reduce, the required power consumption would increase dramatically.…”

Section: Introductionmentioning

confidence: 99%

Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge

Xiong

Liu

et al. 2021

Sci Rep

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This study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular polymeric substance (EPS) content in the sludge was reduced during electro-dewatering process, even the species of organic matter was changed, as well as the dewatered cake tend to form many seepage channels, crack and a certain number of holes. These changes in the properties and structure were conducive to the subsequent low-temperature drying process. For air-drying process, the mass of the sludge cake variation was simulated and results were consistent with the experimental phenomenon. Firstly, the weight of the sludge cake was decreased approximately linearly with time, then tended to stable and reached the dewatering limitation finally. The applied higher electric field intensity (25 V cm−1) in the front-end electro-dewatering were conducive to promote water vapor diffusion activity in air-drying stage. Energy consumption and yield analysis results indicated that the combined technology has lower energy consumption and higher yield than that of directly low-temperature drying.

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Dewaterability and energy consumption model construction by comparison of electro-dewatering for industry sludges and river sediments

Cited by 24 publications

References 51 publications

Comprehensive assessment of enhancing dewaterability of dredged sediments by starch-based flocculant

Comprehensive assessment of enhancing dewaterability of dredged sediments by starch-based flocculant

Application of a Mathematical Model for Sludge Reduction in Pharmaceutical Wastewater

Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge

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