Combined electrical-alkali pretreatment to increase the anaerobic hydrolysis rate of waste activated sludge during anaerobic digestion

Zhen, Guangyin; Lü, Xueqin; Zhao, Youcai

doi:10.1016/j.apenergy.2014.04.062

Cited by 204 publications

(73 citation statements)

References 60 publications

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“…However, the electrolysis pretreatment, especially if assisted by chemical methods (Zhen et al 2014), will become more energy efficient for sludge treatment as they solubilize Fig. 4 Effect of pH (a) and current density (b) on the COD solubilization of WAS during electrolysis pretreatment sludge and obviate the need for high voltages.…”

Section: Electro-oxidationmentioning

confidence: 99%

“…This result is in the same range as about thermo-alkaline pretreatment. Very recently, combination between electrolysis and alkali pretreatment has shown to be an efficient alternative for sludge modification prior to anaerobic digestion (Zhen et al 2014). The effect of the studied pretreatments on biogas production will be discussed in the subsequent section.…”

Section: Electro-oxidationmentioning

confidence: 99%

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Improvement of anaerobic digestion of waste-activated sludge by using H2O2 oxidation, electrolysis, electro-oxidation and thermo-alkaline pretreatments

Feki

Khoufi

Loukil

et al. 2015

Environ Sci Pollut Res

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Disintegration of municipal waste-activated sludge (WAS) is regarded as a prerequisite of the anaerobic digestion process to reduce sludge volume and improve biogas yield. Pretreatment of WAS using thermo-alkaline (TA), H2O2 oxidation, electrolysis and electro-oxidation (EO) processes were investigated and compared in term of COD solubilization and biogas production. For each pretreatment, the influences of different operational variables were studied in detail. At optimum conditions, EO gave the maximum COD solubilization (28 %). The effects of pretreatments under the optimum conditions on anaerobic digestion were experienced with biochemical methane potential assay. Significant increases in biogas yield up to 78 and 40 % were observed respectively in the EO and TA pretreated samples compared to raw sludge. Results clearly revealed that the application of EO is a significant alternative method for the improvement of WAS anaerobic digestion.

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Section: Electro-oxidationmentioning

confidence: 99%

Section: Electro-oxidationmentioning

confidence: 99%

Improvement of anaerobic digestion of waste-activated sludge by using H2O2 oxidation, electrolysis, electro-oxidation and thermo-alkaline pretreatments

Feki

Khoufi

Loukil

et al. 2015

Environ Sci Pollut Res

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show abstract

“…Issues related to the high nitrogen load of reject water can be mitigated using contemporary nitrogen removal processes such as deammonification (partial nitritation/anammox), which have been demonstrated to reduce aeration energy requirements, save organic carbon to be used for subsequent biogas production, and reduce overall sludge production [15]. The poor dewaterability could be counteracted by appropriate sludge pre-treatment, which is not only deemed to increase dewaterability, but also has the potential to stimulate degradability of the substrate [16][17][18].…”

Section: Introductionmentioning

confidence: 98%

Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant

2015

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“…Different pretreatment methods have been studied to improve the anaerobic degradability of sewage sludge including thermal hydrolysis, ozone oxidation, alkaline hydrolysis, and ultrasound [6][7][8][9]. Among these, ultrasonication is a well-known method to break-up microbial cells and to extract intracellular material [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

Martínez

Rosas

Morán

et al. 2015

Water

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Abstract:The aim of this work was to study the effect of ultrasonic pretreatment on sludge digestion, particle size distribution (PSD), and dewaterability of digestates (measured by capillary suction time (CST) and specific resistance to filtration (SRF)). Sludge was pretreated with ultrasound (24 kHz) at an energy dosage of 4300 kJ/kg TS. Digestibility of sludge was increased by ultrasound pretreatment resulting in a higher specific methane production (SMP). The digestate of pretreated waste activated sludge (WAS) obtained under batch conditions presented a better dewatering performance. Digestion under semi-continuous conditions was evaluated using sewage sludge (mixture of primary sludge and WAS). In this case, digestates presented a much higher mean particle size for both cases evaluated (pretreated and non-pretreated) than that obtained under batch conditions. A wide PSD was a characteristic of these digestate samples. Flow dynamics inside the reactor resulted in the presence of high-diameter flocs, thus significantly affecting the mean particle size and specific surface area (SSA) values.

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Combined electrical-alkali pretreatment to increase the anaerobic hydrolysis rate of waste activated sludge during anaerobic digestion

Cited by 204 publications

References 60 publications

Improvement of anaerobic digestion of waste-activated sludge by using H2O2 oxidation, electrolysis, electro-oxidation and thermo-alkaline pretreatments

Improvement of anaerobic digestion of waste-activated sludge by using H2O2 oxidation, electrolysis, electro-oxidation and thermo-alkaline pretreatments

Co-digestion of food waste in municipal wastewater treatment plants: Effect of different mixtures on methane yield and hydrolysis rate constant

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

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