Physical and chemical characteristics of waste activated sludge treated ultrasonically

Feng, Xin; Lei, Hengyi; Deng, Jinchuan; Yu, Qiang; Li, Hualiang

doi:10.1016/j.cep.2008.03.012

Cited by 138 publications

(105 citation statements)

References 38 publications

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“…The highest release of nitrate nitrogen can be explained by aerobic condition in the process of hydrodynamic disintegration, and also oxidation by hydroxyl radicals generated in the cavitation process. The obtained results are totally different from the results of nitrogen compounds solubilization given by Feng et al [10]. Ultrasound WAS disintegration in the range of 500 to 26 000 kJ/kg TS resulted in ammonia nitrogen increase from 10 to 43 mg N-NH 4 + /dm 3 , with almost no increase of nitrates at the level of about 6 mg N-NO 3 /dm 3 [10].…”

Section: Nutrients In the Process Of Anaerobic Digestioncontrasting

confidence: 55%

“…The obtained results are totally different from the results of nitrogen compounds solubilization given by Feng et al [10]. Ultrasound WAS disintegration in the range of 500 to 26 000 kJ/kg TS resulted in ammonia nitrogen increase from 10 to 43 mg N-NH 4 + /dm 3 , with almost no increase of nitrates at the level of about 6 mg N-NO 3 /dm 3 [10]. Assuming that the concentration of nitrogen is about 16-19% in proteins, then the total amount of nitrogen forms is not released in proportion to proteins dissolution.…”

Section: Nutrients In the Process Of Anaerobic Digestioncontrasting

confidence: 55%

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Nitrogen in the Process of Waste Activated Sludge Anaerobic Digestion

Suschka¹,

Grűbel²

2014

Archives of Environmental Protection

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Primary or secondary sewage sludge in medium and large WWTP are most often processed by anaerobic digestion, as a method of conditioning, sludge quantity minimization and biogas production. With the aim to achieve the best results of sludge processing several modifi cations of technologies were suggested, investigated and introduced in the full technical scale. Various sludge pretreatment technologies before anaerobic treatment have been widely investigated and partially introduced. Obviously, there are always some limitations and some negative side effects. Selected aspects have been presented and discussed. The problem of nitrogen has been highlighted on the basis of the carried out investigations. The single and two step -mesophilic and thermophilic -anaerobic waste activated sludge digestion processes, preceded by preliminary hydrolysis were investigated. The aim of lab-scale experiments was pre-treatment of the sludge by means of low intensive alkaline and hydrodynamic disintegration. Depending on the pretreatment technologies and the digestion temperature large ammonia concentrations, up to 1800 mg NH 4 /dm 3 have been measured. Return of the sludge liquor to the main sewage treatment line means additional nitrogen removal costs. Possible solutions are discussed.

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Section: Nutrients In the Process Of Anaerobic Digestioncontrasting

confidence: 55%

Section: Nutrients In the Process Of Anaerobic Digestioncontrasting

confidence: 55%

Nitrogen in the Process of Waste Activated Sludge Anaerobic Digestion

Suschka¹,

Grűbel²

2014

Archives of Environmental Protection

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“…Szczególne zainteresowanie badaczy związane jest z wykorzystaniem ultradźwięków o niskiej częstotliwości w zakresie 20÷40 kHz. Najwięcej prac dotyczy wpływu działania ultradźwięków na proces kondycjonowania osadów ściekowych [13][14][15][16] oraz wykorzystania rozłożonej pod wpływem działa-nia ultradźwięków materii organicznej na zwiększenie wytwarzania biogazu podczas procesu fermentacji [17][18][19], natomiast niewiele doniesień dotyczy wpływu ultradźwięków na procesy biologiczne.…”

Section: Wstępunclassified

The Use of Low Frequency Ultrasound to Disintegrate Filamentous Bacteria

Butarewicz

Wołejko

Jabłońska-Trypuć

et al. 2017

Eng. Prot. Environ.

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The increase in the number of filamentous bacteria in activated sludge causes complications in the functioning of the sewage treatment plant. The paper presents the results of investigation of activated sludge coming from two sewage treatment plants -municipal and industrial. In both treatment plants the increase in the number of filamentous bacteria in winter has been noticed. In order to reduce the number of filamentous bacteria in activated sludge, the sludge samples were subjected to ultrasonic disintegration at a frequency of 40 kHz at 1, 2, 3, 5, 10 and 20 minutes. The use of low frequency ultrasounds has contributed to the defragmentation and destruction of most filamentous bacteria in activated sludge after 10 minutes of their operation. Necessary time to almost complete defragmentation of filamentous bacteria is more than 20 minutes.

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“…SCOD NaOH was obtained by alkaline hydrolysis, wherein the initial sludge sample was mixed with 0.5 M NaOH at room temperature for 24 h (Feng et al, 2009b).…”

Section: Discussionmentioning

confidence: 99%

“…The water content of activated sludge can be decreased to approximately 80% with existing mechanical dewatering technologies. To this end, various methods have been proposed to improve sludge dewaterability, such as the addition of acids and surfactants, Fenton's reagent pre-treatment, fungal treatment, ultrasonication, and microwave irradiation (Chen et al, 2001;Eskicioglu et al, 2007;Fakhru'l-Razi and Molla, 2007;Tony et al, 2008;Feng et al, 2009a;2009b;Yu et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Improved waste-activated sludge dewatering using sludge/oil emulsion, ultrasonic and microwave technologies

Kim¹,

Kim²,

Chung

2014

WSA

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Conventional dewatering technologies, such as centrifuges, belt filter presses, and rotary vacuum filters, are not effective methods for treating sewage sludge with high water content. This study evaluated the field-scale feasibility of new technologies that use emulsion, ultrasonication, and microwaves to dewater sludge. Emulsion technology lowered the water content in sludge to 60%, but the overall process was too complex to incorporate into the design of commercial plants due to the requirement for oil-and methanol-recovery facilities. Ultrasonication had low dewatering and energy efficiency with long irradiation times, indicating that it would be difficult to implement in a field plant. The water content of sludge was reduced to 60% within 120 s using microwaves, but dewatering efficiency depended on the thickness and volume of the sludge. In a pilot-scale test, the average energy consumption was 0.54 kWh/kg of water removed, and the final water content of the sludge cake reached 60% within 30 min.

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Physical and chemical characteristics of waste activated sludge treated ultrasonically

Cited by 138 publications

References 38 publications

Nitrogen in the Process of Waste Activated Sludge Anaerobic Digestion

Nitrogen in the Process of Waste Activated Sludge Anaerobic Digestion

The Use of Low Frequency Ultrasound to Disintegrate Filamentous Bacteria

Improved waste-activated sludge dewatering using sludge/oil emulsion, ultrasonic and microwave technologies

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