Rheological behaviour of activated sludge treated by thermal hydrolysis

Urrea, José Luis; Collado, Sergio; Laca, Amanda; Dı́az, Mario

doi:10.1016/j.jwpe.2014.06.009

Cited by 29 publications

(9 citation statements)

References 27 publications

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“…The process uses steam, under pressure, to heat sludges to 165°C for 30 min to thermally hydrolyze the sludges. The process provides several benefits: Increased rate and extent of biodegradation and net biogas production (Haug, Stuckey, Gossett, & McCarty, ; Li & Noike, ; Wilson, Tanneru, Banjade, Murthy, & Novak, ); Decreased viscosity of the solids (Bougrier, Delgenes, & Carrere, 2008; Pereboom, Luning, Hol, Dijk, & Man, ; Urrea, Collado, Laca, & Diaz, ); Improved dewaterability in terms of cake solids (Fjordside, ; Pereboom et al., ; Wilson et al., ). …”

Section: Introductionmentioning

confidence: 99%

“…Increased rate and extent of biodegradation and net biogas production (Haug, Stuckey, Gossett, & McCarty, 1978;Li & Noike, 1992;Wilson, Tanneru, Banjade, Murthy, & Novak, 2011); 2. Decreased viscosity of the solids (Bougrier, Delgenes, & Carrere, 2008;Pereboom, Luning, Hol, Dijk, & Man, 2014;Urrea, Collado, Laca, & Diaz, 2015); 3. Improved dewaterability in terms of cake solids (Fjordside, 2002;Pereboom et al, 2014;Wilson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Higgins

Beightol

DeBarbidillo

et al. 2019

Water Environment Research

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The goal of this study was to evaluate using feed dilution/solids retention time (SRT) control to manage potential ammonia inhibition in highly loaded anaerobic digesters after thermal hydrolysis. The study compared three digesters operated at the same target volatile solids (VS) loading rate of 5.5 kg VS/d‐m3, but at different feed concentrations resulting in SRTs of 10, 15, and 18 days. Lowering the feed concentration decreased the digester total ammonia nitrogen concentrations which averaged 1,580, 2,610, and 3,080 mg NH4+ ‐N/L for the 10‐, 15‐, and 18‐day digesters. The VS reduction and methane yields were equivalent for the 15‐ and 18‐day digesters and about 4% lower for the 10‐day digester. Ammonia inhibition of the 18‐day digester occurred early in the study, but the system acclimated over time. Feed dilution reduced the viscosity and the potential for volume expansion due to gas holdup and foaming. Practioner points Feed dilution reduces digester ammonia concentrations and inhibition potential without sacrificing digester performance at lower SRTs. Feed dilution greatly reduces digester viscosity and associated issues with digester volume expansion due to gas holdup and foaming. Operating at the lower SRT does not impact cake solids after dewatering and substantially decreases polymer demand for conditioning.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Higgins

Beightol

DeBarbidillo

et al. 2019

Water Environment Research

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“…In sludge treatment, hydrothermal processing has traditionally had three main goals: the enhancement of a subsequent anaerobic digestion process, the reduction of the solid COD and/or the reduction of waste mass and volume (Barber, 2016;Chung et al, 2009;Genç et al, 2002;Khan et al, 1999). These approaches explain why, although the literature about sludge thermal treatments is abundant, the vast majority of these studies are only focused on the measurement of degrees of solubilisation and mineralisation, biodegradability indexes and/or biochemical methane potentials before and after treatment (Abe et al, 2011;Strong et al, 2011;Urrea et al, 2015). Nevertheless, information about the effects of thermal treatments on the composition or on other properties of the hydrolysed sludge is very scarce or does not even exist.…”

Section: Introductionmentioning

confidence: 99%

Sludge hydrothermal treatments. Oxidising atmosphere effects on biopolymers and physical properties

Urrea

García

Collado

et al. 2018

Journal of Environmental Management

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In this work, the role of an oxidising atmosphere during the hydrothermal treatment of an activated sludge at 160 °C and 40 bar, was determined. The composition and molecular weight sizes of the soluble biopolymers generated during the sludge treatment in presence (wet oxidation "WO") or absence (thermal hydrolysis "TH") of oxygen were compared. Likewise, the characteristics of organic material, settleability, colour and pH of the treated sludge during both treatments were analysed. The thermal treatment in presence of oxygen provided better results in terms of solubilisation, settleability and mineralisation. WO initially favoured a more intense cellular lysis, causing a higher degree of solubilisation than that achieved by TH. Either in presence or absence of oxygen, thermal treatments caused a marked worsening of the settleability of the sludge. However, the degradation of biopolymers during WO led subsequently to an improvement of the settleability properties for longer reaction times. Both treatments caused a fast solubilisation of biopolymers at the beginning by effect of the release of extracellular and intracellular material from sludge. Subsequently, the presence of oxygen produced a significant decrease in the concentration of those biopolymers. In contrast, the proteins were the only one biopolymer that was degraded during TH.

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“…A number of studies have shown that increasing the hydrolysis temperature decreases sludge viscosity between temperatures approx. 130°C -180°C (Urrea et al 2015, Higgins et al 2014. Sludge become more Newtonian fluid as hydrolysis temperature increased (Bougrier et al 2006).…”

Section: Impact Of Tchp On Twas Viscositymentioning

confidence: 99%

Reducing Sludge Viscosity and Improving Dewaterability through a Thermochemical Hydrolysis Process

Tan¹,

Li²

2017

proc water environ fed

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Thermal hydrolysis pre-treatment of sludge for anaerobic digestion increases biogas production, enhances volatile solids reduction, and improves dewaterability of digested sludge. This study reports the performance of a thermochemical hydrolysis process (TCHP) that utilizes heat (60°C-70 °C) and sodium hydroxide for cell lysis. The objective of this study is to evaluate the impacts of implementing the TCHP on viscosity and floc morphology of thickened waste activated sludge (TWAS), dewaterability of anaerobically digested sludge, and biogas production. Cell lysis of TWAS was confirmed by microscope examination. Dewaterability of digested sludge was improved on full-scale dewatering centrifuges. The current data suggest at least 5-fold reduction of dynamic viscosity of WAS by thermal chemical hydrolysis treatment. Overall, the TCHP effectively hydrolyses TWAS and increases dewatered cake solids.

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Rheological behaviour of activated sludge treated by thermal hydrolysis

Cited by 29 publications

References 27 publications

Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Impacts of feed dilution and lower solids retention time on performance of thermal hydrolysis/anaerobic digestion

Sludge hydrothermal treatments. Oxidising atmosphere effects on biopolymers and physical properties

Reducing Sludge Viscosity and Improving Dewaterability through a Thermochemical Hydrolysis Process

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