Modelling two-sided electrofiltration of quartz suspensions: Importance of electrochemical reactions

Saveyn, Hans; Meeren, Paul Van der; Hofmann, Ralph; Stahl, W.

doi:10.1016/j.ces.2005.05.058

Cited by 26 publications

(9 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, water content in sludge samples at the anode was found higher than sludge samples the cathode (Table 5.1). The acidic pH in sludge at the anode decreased electro-osmotic flow, which was in agreement with previous studies [125,168]. In non-pressure anaerobically digested sludge experiments, the pH of the final sludge cake at the anodic side was 4.0 and 2.3 as well as 2.0 in experiments using raw sludge with and without added alkalinity, respectively.…”

Section: Effect Of Sludge Type On Electro-dewatering (Ii)supporting

confidence: 91%

Sewage sludge electro-dewatering

Tuấn¹

2020

Advanced Water Treatment

View full text Add to dashboard Cite

However interrupted voltage application had a negative impact on dewatering in this study, probably because the off-times were too long.Other factors affecting dewatering performance were associated to the original sludge characteristics and sludge conditioning. Anaerobic digestion of the sludge with high pH buffering capacity, polymer addition and freeze/thaw conditioning had a positive impact on dewatering. The impact of pH on electro-dewatering was related to the surface charge of the particles measured as zeta-potential.One of the differences between electro-dewatering and mechanical dewatering technologies is that electro-dewatering actively removes ionic compounds from the sludge. In this study, dissolution and migration of organic compounds (such as shortchain fatty acids), macro metals (Na, K, Ca, Mg, Fe) and trace metals (Ni, Mn, Zn, Cr) was investigated. The migration of the metals depended on the fractionation and electrical field strength. These compounds may have both negative and positive impacts on the reuse and recycling of the sludge and removed water.Based on the experimental results of this study, electro-dewatering process can be optimized in terms of dewatering time, desired DS content, power consumption and chemical usage.

show abstract

Section: Effect Of Sludge Type On Electro-dewatering (Ii)supporting

confidence: 91%

Sewage sludge electro-dewatering

Tuấn¹

2020

Advanced Water Treatment

View full text Add to dashboard Cite

show abstract

“…Continuous release of hydronium and hydroxide ions results in acidification and alkalization of filtrate respectively at the anode and at the cathode sides, and thus in chemical contamination of filtrate [2]. Ions H + and OH − also migrate to the filter cake [10] that can affect the electrodewatering efficiency in the case of pH−sensitive sludges [31].…”

Section: Acid and Alkaline Contamination Of Filtrate And Electrode Comentioning

confidence: 99%

Improvement of sludge electrodewatering by anode flushing

2015

View full text Add to dashboard Cite

An improvement of the sludge electrodewatering process is proposed: the anode flushing by filtrate recirculation. According to this technique, the mixture of filtrates obtained at cathode and anode sides, is used for continuous flushing of anode chamber of the filter press during electrodewatering. The anode flushing is aimed to eliminate essential problems of electrodewatering: ohmic heating, rise of electric energy consumption, electrodes corrosion, and filtrate contamination. This is attained by better control of the

show abstract

“…Generally, the characteristic bands of quinoid and benzenoid rings appeared at approximately 1598 cm −1 and 1498 cm −1 in undoped PANI membrane [ 15 ] ( Figure S6 in the supplementary material ). The quinoid stretching mode red shifted from 1598 cm −1 to 1559 cm −1 , implying the interaction between π-conjugated structure and imine nitrogens of PANI, transforming the imine groups (=N–) into amine groups (–N–) [ 32 ]. The band at 1295 cm −1 corresponds to C–N stretching vibrations of secondary amine of PANI backbone.…”

Section: Resultsmentioning

confidence: 99%

“…The externally electrical potential triggered in situ fouling removal on the electrically conductive PANI/EG composite membrane and there were several major mechanisms contributed to the electricity driven fouling reduction [ 32 , 46 , 48 ].…”

Section: Resultsmentioning

confidence: 99%

Linking the Tuneability and Defouling of Electrically Conductive Polyaniline/Exfoliated Graphite Composite Membranes

Wang

et al. 2021

Membranes

View full text Add to dashboard Cite

Stimuli responsive membranes, which are able to respond to environmental stimuli, are attracting ever-increasing interests. In this study, we blended exfoliated graphite (EG) into the polyaniline (PANI) and developed PANI/EG composite membranes. The properties of the new generated membranes, especially the stimuli response properties (e.g., electrical tuneability, deformation), were studied. The fouling removal ability of the membrane under applied electrical potential was also investigated by using bovine serum albumin (BSA) as a model foulant. A flat membrane with defect-free surface and good adhesion to the support layer was formed by non-solvent induced phase separation method. The electrical conductivity of the formed PANI/EG composite membrane was (5.10 ± 0.27) ×10−4 S cm−1. The dynamic droplet penetration rate through the membranes showed an increase under applied electrical potential, which gives a preliminary quantitative indication of the electrical tuneability of the membranes. The membrane deformation appeared at a fast response under applied potential and recovered to its original position immediately when removing the applied potential. The application of electrical potential led to the removal of BSA foulant from the membrane surface as indicated by the increase in permeance of the fouled membrane on cleaning with 46.2% flux recovery ratio and increased BSA concentration in the wash solution. The electrically conductive PANI/EG composite membranes are able to respond to electrical stimuli, enabling a new range of potential applications including externally tuneability and in situ removal and control of fouling.

show abstract

Modelling two-sided electrofiltration of quartz suspensions: Importance of electrochemical reactions

Cited by 26 publications

References 21 publications

Sewage sludge electro-dewatering

Sewage sludge electro-dewatering

Improvement of sludge electrodewatering by anode flushing

Linking the Tuneability and Defouling of Electrically Conductive Polyaniline/Exfoliated Graphite Composite Membranes

Contact Info

Product

Resources

About