Effectiveness of Electrooxidation Process for Stabilizing and Conditioning of Urban and Industrial Wastewater Sludge

Drogui, Patrick; Bureau, Marc-André; Mercier, Guy; Blais, Jean-François

doi:10.2175/106143012x13415215907257

Cited by 10 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the one side, these problems provoke the interest to the application of environmentally friendly flocculants [6,7]. On the other side, this encourages the elaboration of alternative methods of sludge dewatering [5,[8][9][10][11][12][13]].…”

Section: Introductionmentioning

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

Section: Introductionmentioning

confidence: 99%

Improvement of sludge electrodewatering by anode flushing

2015

View full text Add to dashboard Cite

show abstract

“…In addition, calcium (Ca), potassium (K) and magnesium (Mg) concentrations increased by 20% to 50%, while total nitrogen content remained stable (Bureau et al, 2012), ensuring that the fertilizing value of the sludge was not compromised. Finally, electro-oxidation pre-treatments allowed sludge disinfection, a decrease in organic carbon content, metal deposition and a raise in nutrient content (Drogui et al, 2013;Masihi & Gholikandi, 2018;. The potential problems of electrode fouling and corrosion as well as biofilm development in long-term use have not yet been discussed in detail and should be tested in further studies.…”

Section: Effluents With High Rheological Complexitymentioning

confidence: 99%

Electrochemical treatment of highly concentrated wastewater: A review of experimental and modeling approaches from lab- to full-scale

García-Rodríguez

Mousset

Olvera‐Vargas

et al. 2020

Critical Reviews in Environmental Science and Technology

View full text Add to dashboard Cite

This review proposes an insight into the prospects of electrochemistry for the treatment of highly concentrated effluents in three sections. The first section focuses on the challenges inherent to such kind of wastewater, divided into five categories: industrial wastewater (e.g., pharmaceutical, electronics, chemical, food-processing), hypersaline effluents (e.g., RO concentrates), solutions contaminated with a mixture of organic and inorganic contaminants (e.g., leachate, mining), highly viscous solution (or non-Newtonian liquid) (e.g., sludge) and solutions of high COD load but with low pollutant content (e.g., from soil washing). The second section of this review then focuses on the treatment strategies to ensure that the electrochemical treatment is adapted to these very specific waste streams, including the influence of operating conditions, electrode materials and processes (with special emphasis on anodic oxidation, electro-Fenton and electrocoagulation). The final part focuses on the perspectives of electrochemical treatment of challenging wastewater, by giving the engineering parameters to ensure successful upscaling of electrochemical processes in terms of modeling mass transport, charge transfer and hydrodynamics, reactor designs and energy requirements. The review concludes on process combinations, where electrochemistry could complement traditional methods of treatment, in order to improve the overall efficiency of the integrated system.

show abstract

“…As recently proposed by Pérez-Rodríguez et al [16], hydrolysis rate can be improved if the critical engineering aspects of reactors used for this purpose are identified. The primary drawback of EOP is associated to high-energy consumptions, due to operating inefficiencies [17].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of an integrated process of electrooxidation and anaerobic digestion of waste activated sludge

Barrios¹,

Cano²,

Rivera³

et al. 2020

Preprint

View full text Add to dashboard Cite

Background Most of the organic content of waste activated sludge (WAS) comprises microbial cells hard to degrade, which must be pre-treated for the energy recovery by anaerobic digestion (AD). Electrooxidation pre-treatment (EOP) with a boron-doped diamond (BDD) electrode have been considered a promising novel technology that increase hydrolysis rate, by the disintegrating cell walls from WAS. Although electrochemical oxidation could efficiently solubilise organic substances of macromolecules, limited reports are available on EOP of WAS for improving AD. In this endeavour, the mathematical optimization study and the energy analysis of the effect of current density (CD) during EOP and the initial total solids concentration [TS] from WAS on methane (CH4) production by AD was investigated. Results In the present work, biogas production from WAS conversion are comprehensively affected by CD and [TS]. The highest COD and VS removal by 60 and 39% respectively, were achieved with WAS at 3% of [TS] pre-treated at CD of 24.1 mA/cm2, and with a maximum CH4 production of 305 N-L/kg VS and a positive energy balance of 0.83 kWh/kg VS. Therefore, the low current densities used in boron-doped diamond (BDD) electrode are adequate to produce the strong oxidant ●OH radical on the electrode surface, allow the oxidation of organic compounds that favours the solubilization of COD from WAS. Conclusions The improvement of VS removal indicates that EOP help to disintegrating cell walls from WAS. This allows a decomposition reaction that leads to biodegrade more compounds during AD. The energy balance was positive, suggesting that even without any optimization the energy used as electricity could be approximately recovered as energy from the increased methane production. However, this kind of analysis have not been sufficiently studied so far, therefore, is important to understand how critical parameters can influence the pre-treatment and AD performances. The current study highlights that the mathematical optimization and energy analysis can get the whole process more convenient and feasible.

show abstract

Effectiveness of Electrooxidation Process for Stabilizing and Conditioning of Urban and Industrial Wastewater Sludge

Cited by 10 publications

References 22 publications

Improvement of sludge electrodewatering by anode flushing

Improvement of sludge electrodewatering by anode flushing

Electrochemical treatment of highly concentrated wastewater: A review of experimental and modeling approaches from lab- to full-scale

Efficiency of an integrated process of electrooxidation and anaerobic digestion of waste activated sludge

Contact Info

Product

Resources

About