Influence of excessive sludge conditioning on the efficiency of anaerobic stabilization process and biogas generation

Zawieja, Iwona; Wolny, L.; Wolski, Paweł

doi:10.1016/j.desal.2007.01.141

Cited by 25 publications

(11 citation statements)

References 7 publications

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“…The use of ultrasound disintegration as one of methods of conditioning leads to the dispersion of the structure of sewage sludge and thus affects intensifi cation of the process of methane fermentation [10,12,13]. According to the literature [3,7,14], pre-conditioning of the excess sludge subjected to the process of methane fermentation with the ultrasound fi eld positively affects the increase of COD and VFA values in the supernatant liquor.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Wolski¹,

Zawieja²

2012

Archives of Environmental Protection

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“…(2) Application of inorganic coagulant PIX-123 and polyelectrolyte Zetag 8160 causes a decrease of CST value. (3) Applied doses of chemical reagents (PIX-123, Zetag 8160) make it possible to achieve lower final hydration in the process of vacuum and pressure filtration.…”

Section: Discussionmentioning

confidence: 99%

“…One of the interesting methods of sewage sludge processing is sludge disintegration which is basically an important factor in enhancing the efficiency of sludge stabilization [1][2][3][4][5]. During disintegration, the solid particles of sludge are fragmented and the destruction of microorganism cells takes place with its release to liquid sludge.…”

Section: Introductionmentioning

confidence: 99%

Use of inorganic coagulants and polyelectrolytes to sonicated sewage sludge for improvement of sludge dewatering

Bień

2014

Desalination and Water Treatment

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A B S T R A C TThe paper presents the research on the possible use of inorganic coagulants and polyelectrolytes for conditioning of sonicated and non-sonicated sewage sludges and the impact of conditioning process on the sludge rheological parameters and dewatering process. Dewatering of sludge with a high share of organic matter or sludge with a high percentage of fine fractions and colloidal suspensions causes clogging of the filter, and an increase in filtration resistance does not bring good technological and economic effects. To improve the degree of dewatering of such sonicated and non-sonicated sludges, coagulants and polyelectrolytes and their mixture in appropriate proportions and conditions could be used. The usage of both substances: PIX and polyelectrolyte helped to achieve a cleaner filtrate in comparison with when only polyelectrolyte is used. The rheological parameters of sludge, its structure as well as processes parameters, such as vacuum filtration and pressure filtration were determined during tests. The results show that during application in the conditioning of sonicated sludge, both chemical substances (inorganic coagulant and polyelectrolyte) resulted in a significant improvement of parameters used in order to determine the susceptibility to sludge dewatering.

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“…Highly effective dewatering method is very difficult, and despite different techniques used, no final product containing less than 65% dry matter has been achieved [12]. In addition, the properties of sewage sludge change, for example, with the use of ultrasonic disintegration which affects the intensification of the methane fermentation process [13,14] and has a significant effect on the dispersion of the sludge structure.…”

Section: Introductionmentioning

confidence: 99%

The Effect of PIX 123 and Polyelectrolyte Zetag 8160 on the Conditioning and Dewatering of Sewage Sludge

Bień¹

2017

Eng. Prot. Environ.

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Wpływ PIX 123 i polielektrolitu Zetag 8160 na kondycjonowanie i odwadnianie osadów ściekowychThe paper presents the research on the possible use of inorganic coagulant and polyelectrolyte for conditioning of sonicated and non-sonicated digested sewage sludge. The digested sewage sludge from mechanical-biological wastewater treatment was analyzed. The effect of PIX 123 and polyelectrolyte Zetag 8160 and their combined effect on sonicated and nonsonicated sludge was determined. Dosing of coagulant to sludge does not create large and durable flocks that can be effectively separated by thickening or dewatering. Then, a good preconditions for creating strong flocs, obtaining a clear effluent, and improving the degree of sludge dewatering are formed. However, it requires to use a suitable polyelectrolyte after coagulation. For sludge samples the following tests were performed: capillary suction time, vacuum filtration, pressure filtration and sludge structure was observed. The suspension and COD content in the sludge liquids were also analyzed. For non-sonicated sludge prepared with Zetag 8160 or PIX 123 a better effect of the CSK decrease was obtained for Zetag 8160. For sonicated sludge PIX 123 was significantly more effective. Both the dose and the chemical used, as well as the sonication time, have a great impact on sludge structure transformation. The applied doses of PIX 123 and Zetag 8160 increased the degree of sludge dewatering, and the combined effect of ultrasonic field, PIX 123 and Zetag 8160 decreased the suspension and COD content in sludge liquids.

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Influence of excessive sludge conditioning on the efficiency of anaerobic stabilization process and biogas generation

Cited by 25 publications

References 7 publications

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Effect of Ultrasound Field on Dewatering of Sewage Sludge

Use of inorganic coagulants and polyelectrolytes to sonicated sewage sludge for improvement of sludge dewatering

The Effect of PIX 123 and Polyelectrolyte Zetag 8160 on the Conditioning and Dewatering of Sewage Sludge

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