Physicochemical properties of sewage sludge disintegrated with high pressure homogenization

Fang, Wei; Zhang, Panyue; Ye, Jie; Wu, Yan; Zhang, Haibo; Li, Jianbo; Zhu, Yi; Zeng, Guangming

doi:10.1016/j.ibiod.2015.02.030

Cited by 31 publications

(9 citation statements)

References 30 publications

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“…The components and content of EPS heavily depend on many factors such as bacterial type and cultivation time. The relationship between the EPS content and surface characteristics of microorganisms from various origins has been reported (Liao et al 2001;Li and Yang 2007;Fang et al 2015). However, contrary results were always obtained and they seemed to be greatly related to their origins and growth phases.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

2015

Int. J. Environ. Sci. Technol.

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Laboratory experiments were conducted to investigate the correlation of the free cells/aggregated flocs characteristics and the sludge flocculation and separation behavior during the activated sludge process. Activated sludge was cultured in three laboratory-scale batch reactors with same carbon sources of glucose but different sludge retention times (SRTs) of 5, 10 and 20 days. The variation in the operation condition produced sludge with different flocculation and separation characteristics. The reactor performance in terms of bioflocculation as measured by the amount of suspended solids in the effluent, sludge sedimentation and compression as measured by the sludge value index improved considerably as the SRT lengthened. The higher SRT was related to less negatively charged surface of free cells and more hydrophobic of aggregated flocs. The negative zeta potential of aggregated flocs (11-13 mV) was smaller than that of free cells (15-23 mV), and free cells carrying lesser negative surface charges resulted in effluent clarification. Hydrophobicity of aggregated flocs (10-17 %) in each reactor was higher than that of free cells (5-8 %). The increase in hydrophobicity of aggregated flocs had positive effect on settleability. Floc strength measured by breakage/erosion index was closely related to hydrophobicity of aggregated flocs, but no correlation could be established with zeta potential of aggregated flocs. In addition, different bacterial species existed in free cells and aggregated flocs. Microbial similarity between free cells and aggregated flocs increased with shorter SRT and was closely related to effluent clarification.

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Section: Resultsmentioning

confidence: 99%

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

2015

Int. J. Environ. Sci. Technol.

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“…Porównując zmiany stopnia dezintegracji opisywane przez Nowicką and Machnicką [2014] dla procesu zamrażania i rozmrażania przy róż-nym stosunku objętościowym osadu nadmiernego do suchego lodu z badaniami własnymi (tabela 1), zauważono, że aby uzyskać porównywalne wartości tego wskaźnika wystarczającym byłoby prowadzenie procesu hydrodynamicznej dezintegracji przy Ɛ L = 280 kJ/l. Fang [2015] natomiast w swojej pracy przedstawił zmiany DD uzyskane podczas homogenizacji wysokociśnieniowej. Uzyskane przez naukowca wartości stopnia dezintegracji były porównywalne do wartości DD uzyskanych w badaniach własnych dla Ɛ L mniejszej od 420 kJ/l.…”

Section: Wyniki Badań I Dyskusja Analiza Zmian Stopnia Dezintegracji unclassified

The Effectiveness of the Organic Compounds Released Due to the Hydrodynamic Disintegration of Sewage Sludge

Szatyłowicz¹,

Garlicka²,

Żubrowska-Sudoł³

2017

Inż. Ekolog.

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STRESZCZENIEGłównym celem eksperymentu było wyznaczenie efektywności uwalniania z kłaczków osadu czynnego związków organicznych w wyniku hydrodynamicznej dezintegracji, prowadzonej przy różnych gęstościach energii (140-700 kJ/l). Jako wskaźniki efektywności procesu wykorzystano stopień dezintegracji (DD) oraz jednostkową wydajność uwalniania do cieczy osadowej związków organicznych (W ChZT ). Analiza otrzymanych wyników pozwoliła stwierdzić, że zwiększanie gęstości energii skutkowało wzrostem wartości rozpuszczonego ChZT. Najbardziej intensywne uwalnianie związków organicznych do cieczy osadowej wystąpiło, gdy gęstość energii zwiększano ze 140 do 420 kJ/l. Ponadto dowiedziono, że prowadząc dezintegrację przy gęstości energii wynoszącej 420 kJ/l, uzyskuje się maksymalne wartości wydajności uwalniania związków organicznych (23,2-30,0 mg ChZT/kJ).Słowa kluczowe: dezintegracja hydrodynamiczna, osady ściekowe, stopień dezintegracji, uwalnianie związków organicznych THE EFFECTIVENESS OF THE ORGANIC COMPOUNDS RELEASED DUE TO THE HYDRODYNAMIC DISINTEGRATION OF SEWAGE SLUDGE ABSTRACTThe main objective of this experiment was to determine the effectiveness of the organic compounds release from activated sludge flocs, due to the hydrodynamic disintegration conducted at different energy densities (140-700 kJ/l). Indicators of the efficiency used for the process were the disintegration degree (DD) and the unit efficiency of organic compounds released (W COD ). Analysis of the results revealed that increasing the energy density resulted in an increase of concentration of soluble COD. The most intense release of organic compounds occurred when the energy density was increased from 140 to 420 kJ/l. Moreover, it was proved that by conducting disintegration using an energy density of 420 kJ/l results in a maximal efficiency of organic compound release (23.2-30.0 mg ChZT/kJ).

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“…With the pretreatment, an acceleration of hydrolysis by the increase of dissolved components, improvement of biodegradability and sludge dewatering can be achieved [4]. Many different types of sludge disintegration like ultrasonic treatment [5], high pressure homogenization [6], hydrodynamic cavitation [7], Fenton process [8], acidic thermal treatment [9], microwave treatment [10] have been investigated in half-scale and lab scale for the purpose of anaerobic digestion intensification. All these studies have documented the ability to achieve higher production of biogas.…”

Section: Introductionmentioning

confidence: 99%

Intensification of anaerobic digestion efficiency with use of mechanical excess sludge disintegration in the context of increased energy production in wastewater treatment plants

et al. 2017

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Abstract. The main goal of the study was to evaluate the effects of mechanical sludge disintegration for enhancing full scale anaerobic digestion of municipal sludge. Batch disintegration tests and lab dewatering tests were also performed aiming at determining the release of organic compounds and assessing the impact of disintegration of excess sludge before the fermentation process of mixed sludge on the dewaterability of post-fermented sludge, respectively. In the study a disc disintegrator driven by a motor with a power of 30 kW, revolutions n = 2950 rpm has been used. It was shown that with increase of energy consumed in the disintegration, the increased amounts of organic compounds were released from the sludge. It was also documented that the introduction of the excess sludge disintegration prior to fermentation tank, resulted in a significant increase in biogas production (by an average of 33.9%) and in increase in volatile total solids reduction in the fermented sludge (by an average of 22.7%). Moreover, the obtained results indicate the possibility of obtaining a higher degree of sludge dewatering, which was subjected to anaerobic stabilization with using disintegrated excess sludge.

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Physicochemical properties of sewage sludge disintegrated with high pressure homogenization

Cited by 31 publications

References 30 publications

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

The Effectiveness of the Organic Compounds Released Due to the Hydrodynamic Disintegration of Sewage Sludge

Intensification of anaerobic digestion efficiency with use of mechanical excess sludge disintegration in the context of increased energy production in wastewater treatment plants

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