Effects of ultrasonic disintegration on sludge microbial activity and dewaterability

Li, Huan; Jin, Yiying; Mahar, Rasool Bux; Wang, Zhiyu; Nie, Yong

doi:10.1016/j.jhazmat.2008.04.113

Cited by 164 publications

(57 citation statements)

References 22 publications

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“…Physical modifi cation caused an increase in the value of capillary suction time proportionally with an increase in ultrasound fi eld amplitude. Similar correlations were obtained by Feng and Huan [4,5], who demonstrated that higher wavelength of ultrasound fi eld, and, consequently, higher energy consumption, resulted in deterioration of the effect Amplituda 0% Amplituda 60% Amplituda 80% of sludge dewatering. The sludge dispergated as a result of the process of sonication caused clogging of the pores in fi ltration paper, thus reducing the fi ltration capacity of the medium, which is an unfavourable effect for the process of dewatering.…”

Section: Discussionsupporting

confidence: 84%

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Wolski¹,

Zawieja²

2012

Archives of Environmental Protection

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Abstract:The paper presents the investigations aimed at the determination of the effect of time and wavelength of ultrasound fi eld on the value of capillary suction time (CST), sludge thickening and dry matter of the excess sludge subjected to the process of stabilization.The investigations were carried out on the excess sludge which comes from communal waste treatment plant. The sludge was exposed to ultrasound fi eld, using ultrasound generator with power of 1500 W, frequency of 20 kHz and amplitude 39.42 μm (which corresponded to the amplitude of 100%). Sonication of the sludge was carried out for different amplitudes and sonication times. The non-conditioned sludge and the sludge initially conditioned with ultrasound fi eld were subjected to the process of stabilization in laboratory fl asks (V = 0.5 dm 3 ) for the period of 10 days. On each day, sludge thickening and dewatering capacities were determined.The sludge subjected to the effect of ultrasound fi eld exhibited elevated levels of CST. However, the sonication time had positive effect on the increase in the degree of thickening for each of the amplitudes studied. Also, the process of stabilization positively affected fi nal thickening and dewatering of the sludge.

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Section: Discussionsupporting

confidence: 84%

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Wolski¹,

Zawieja²

2012

Archives of Environmental Protection

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“…Low density and long duration sonication was more efficient than high density and short duration. The effect of temperature rise was limited at low energy density when sonication time was short (Huan et al, 2009). When the activated sludge was disintegrated with ultrasound, cell membranes were disrupted, releasing intracellular polysaccharides and proteins into the extracellular matrix and thereby leading to the observed increase in EPS levels (Zhang et al, 2007).…”

Section: Dewatering Of Sludge Using Ultrasonic Wavesmentioning

confidence: 99%

“…Alternatively, dewatering technologies using ultrasonic, electro-osmotic, and microwave treatments have been examined (Raats et al, 2002;Dewil et al, 2006;Na et al, 2007;Huan et al, 2009;Feng et al, 2009a). Na et al (2007) observed that ultrasonic treatment of waste-activated sludge improved the dewaterability, as evidenced by decreases in capillary suction time (CST) with increasing ultrasonic energy dosages.…”

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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“…Wśród pozytywnych aspektów wymienia się przed wszystkim: zwięk-szenie efektywności procesu fermentacji metanowej [Petkovšek et al 2015], zmniejszenie obję-tości powstających osadów ściekowych [Yan et al 2013], uzyskanie lepszych efektów odwadniania osadów przefermentowanych [Huan et al 2009], a także intensyfikację usuwania ze ście-ków związków biogennych [Meng et al 2013, Żubrowska-Sudoł andWalczak 2015].W wyniku procesu dezintegracji dochodzi do zniszczenia kłaczkowatej struktury osadu, rozbicia zewnątrzkomórkowych substancji polimerycznych oraz uszkodzenia komórek i ich lizy, co skutkuje zmianami właściwości fizyko-che- …”

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“…Z punktu widzenia zastosowania zdezintegrowanych osadów jako alternatywnego źródła węgla organicznego do wspomagania usuwania ze ścieków związków biogennych, zwraca się uwagę, że dezintegracja, oprócz uwalniania rozpuszczonych związków organicznych, powoduje uwolnienie znacznych ilości związków biogennych [Żubrowska-Sudoł and Walczak 2014], co może negatywnie wpłynąć na efektywność usuwania związków N i P ze ścieków (związki biogenne występujące w strumieniu zdezintegrowanych osadów stanowią bowiem dodatkowy ładunek do usunięcia w reaktorze biologicznym) [Kampas et al 2009]. Z drugiej strony niewątpli-wą zaletą stosowania osadów zdezintegrowanych jest fakt, że przy odpowiednio dobranych parametrach, dezintegracja osadu nie zawsze musi prowadzić do dezaktywacji mikroorganizmów [Huan et al 2009, Żubrowska-Sudoł and Walczak 2014]. Zatem oprócz związków organicznych do reaktora biologicznego wprowadzana jest żywa biomasa, która może dodatkowo wspomóc mikroorganizmy odpowiedzialne za usuwanie ze ścieków zanieczyszczeń.…”

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Deactivation of the Activated Sludge as a Result of Mechanical Disintegration

Szatyłowicz¹,

Walczak²,

Żubrowska-Sudoł³

et al. 2017

Inż. Ekolog.

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WSTĘPZe względu na liczne korzyści, proces dezintegracji osadów ściekowych znajduje coraz szersze zastosowanie w ciągu technologicznym oczyszczalni ścieków. Wśród pozytywnych aspektów wymienia się przed wszystkim: zwięk-szenie efektywności procesu fermentacji metanowej [Petkovšek et al. 2015], zmniejszenie obję-tości powstających osadów ściekowych [Yan et al. 2013], uzyskanie lepszych efektów odwadniania osadów przefermentowanych [Huan et al. 2009], a także intensyfikację usuwania ze ście-ków związków biogennych [Meng et al. 2013, Żubrowska-Sudoł andWalczak 2015].W wyniku procesu dezintegracji dochodzi do zniszczenia kłaczkowatej struktury osadu, rozbicia zewnątrzkomórkowych substancji polimerycznych oraz uszkodzenia komórek i ich lizy, co skutkuje zmianami właściwości fizyko-che- DEACTIVATION OF THE ACTIVATED SLUDGE AS A RESULT OF MECHANICAL DISINTEGRATION ABSTRACTThe aim of the study was to analyse the impact of hydrodynamic disintegration of thickened excess activated sludge, performed at different levels of energy density (70, 140, 210 280 and 350 kJ/l), on the respiratory activity of microorganisms. For this purpose the oxygen uptake rate test (OUR) was used. The experiment also included determination of the sludge disintegration degree (DD). Studies have shown, that the value of the energy density and sludge disintegration degree affected the respiratory activity of microorganisms. With a relatively low DD, below approx. 9% (corresponding to an energy density of approx. 140 kJ/l), increase of microbial activity was observed (6,2−30,2%), as compared with untreated sludge. However, above this value of DD, inactivation of microorganisms occurred. Deactivation of microorganisms higher than 85 % was observed when the sludge disintegration degree was greater than approx. 24% (corresponding to an energy density of approx. 210 kJ/l).

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Effects of ultrasonic disintegration on sludge microbial activity and dewaterability

Cited by 164 publications

References 22 publications

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Effect of Ultrasound Field on Dewatering of Sewage Sludge

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

Deactivation of the Activated Sludge as a Result of Mechanical Disintegration

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