Dynamic changes in the characteristics and components of activated sludge and filtrate during the pressurized electro-osmotic dewatering process

Feng, Jie; Wang, Yili; Ji, Xue-Yuan

doi:10.1016/j.seppur.2014.07.019

Cited by 57 publications

(22 citation statements)

References 33 publications

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“…Moreover, water removal starts earlier at an applied voltage of at least 15 V (Fig. 2a) (Feng et al, 2014;Olivier et al, 2015).…”

Section: Influence Of Sludge Digestionmentioning

confidence: 96%

“…The application of an electric field, sometimes in combination with pressure, seems capable to increase the DS content in sludge up to 45%, much higher than the values commonly achievable by mechanical methods (Mahmoud et al, 2010;Weng et al, 2013;Feng et al, 2014). The high sludge dryness that is reached by the EDW process is a promising alternative to the thermal drying technique, thanks to the lower energy consumption involved.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors (Feng et al, 2014;Mahmoud et al, 2011;Yuan and Weng, 2003;Tuan et al, 2008;Pham et al, 2010) investigated the influence of process parameters such as pressure, potential (or current) values, tests duration and cake thickness. Citeau et al (2011) also studied the influence of polyelectrolyte type and dosing on EDW efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Performance of electro-osmotic dewatering on different types of sewage sludge

Visigalli

Turolla

Gronchi

et al. 2017

Environmental Research

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A B S T R A C TThe feasibility of pressure-driven electro-dewatering (EDW) on sludge samples taken after different biological processes, stabilisation methods or mechanical dewatering techniques was assessed. First, the influence of potential values on EDW of anaerobically and aerobically stabilised, mechanically dewatered, sludge samples was investigated. Preliminary tests carried out by applying a constant potential (10, 15 and 20 V) in a lab-scale device confirmed the possibility to reach a dry solid (DS) content of up to 42.9%, which corresponds to an increase of 15% of the dry content in dewatered sludge without the application of the electrical field. Dewatering increased with the applied potential but at the expense of a higher energy consumption. A potential equal to 15 V was chosen as the best compromise for EDW performance, in terms of DS content and energy consumption. Then, the influence of the mechanical dewatering was studied on aerobically stabilised sludge samples with a lower initial DS content: the higher initial water content led to a lower final DS content but with a considerable reduction of energy consumption. Finally, the biological process, studied by comparing sludge samples from conventional activated sludge and membrane bioreactor processes, didn't evidence any influence on EDW. Experimental results shown that DS obtained after mechanical dewatering, volatile solids and conductivity are the main factors influencing EDW. Anaerobically digested sludge reached the highest DS content, thanks to lower organic fraction.

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“…Moreover, water removal starts earlier at an applied voltage of at least 15 V (Fig. 2a) (Feng et al, 2014;Olivier et al, 2015).…”

Section: Influence Of Sludge Digestionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance of electro-osmotic dewatering on different types of sewage sludge

Visigalli

Turolla

Gronchi

et al. 2017

Environmental Research

View full text Add to dashboard Cite

show abstract

“…As an alternative dewatering technique, pressure-driven electrodewatering (EDW) is shown to be efficient in sludge dewatering and is able to increase the DS to 40-45% (wt%) [12][13][14][15]. The process has been investigated in many publications, with a focus on the process performance and various operating parameters, such as pressure, electric potential, current, treatment time, delaying the application of the electric field, chemical conditioning dosage and cake thickness in the EDW cell [6,7,12,[15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…The process has been investigated in many publications, with a focus on the process performance and various operating parameters, such as pressure, electric potential, current, treatment time, delaying the application of the electric field, chemical conditioning dosage and cake thickness in the EDW cell [6,7,12,[15][16][17][18][19][20][21][22][23]. Citeau et al have shown that the use of a DC power supply at constant electric potential, instead of constant electric current, allows to achieve a higher DS content [20] and a better control of the temperature at the end of the tests, preventing from ohmic heating [17].…”

Section: Introductionmentioning

confidence: 99%