Production of useful organic matter from sludge using hydrothermal treatment

Shanableh, Abdallah

doi:10.1016/s0043-1354(99)00222-5

Cited by 115 publications

(48 citation statements)

References 14 publications

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“…The rate-limiting step of lysis-cryptic growth is the lysis stage, and an increase of the lysis efficiency can therefore lead to an overall reduction of sludge production. Several methods have been applied for sludge disintegration so far: (i) thermal treatment in the temperature range from 40 C to 180 C [10,11], (ii) chemical treatment using acids or alkali [12], (iii) mechanical disintegration using ultrasounds, mills, and homogenizers [13][14][15][16][17][18][19][20], (iv) freezing and thawing [21], (v) biological hydrolysis with enzyme addition [22], (vi) advanced oxidation processes such as wet air oxidation, using H 2 O 2 and ozone [23][24][25][26], and (vii) combination ways such as thermo-chemical treatment [27][28][29], combination of alkaline and ultrasonic treatment [30]. But the comparison and evaluation of these processes for sludge lysis is not considered in this paper.…”

Section: Lysis-cryptic Growthmentioning

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

618

278

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Excess sludge treatment and disposal currently represents a rising challenge for wastewater treatment plants (WWTPs) due to economic, environmental and regulation factors. There is therefore considerable impetus to explore and develop strategies and technologies for reducing excess sludge production in biological wastewater treatment processes. This paper reviews current strategies for reducing sludge production based on these mechanisms: lysis-cryptic growth, uncoupling metabolism, maintenance metabolism, and predation on bacteria. The strategies for sludge reduction should be evaluated and chosen for practical application using costs analysis and assessment of environmental impact. High costs still limit technologies of sludge ozonation-cryptic growth and membrane bioreactor from spreading application in full-scale WWTPs. Bioacclimation and harmful to environment are major bottlenecks for chemical uncoupler in practical application. Sludge reduction induced by oligochaetes may present a cost-effective way for WWTPs if unstable worm growth is solved. Employing any strategy for reducing sludge production may have an impact on microbial community in biological wastewater treatment processes. This impact may influence the sludge characteristics and the quality of effluent. r

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Section: Lysis-cryptic Growthmentioning

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

618

278

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“…Reported works on sewage sludge were even more limited. Notable studies on hydrothermal treatment of sewage sludge include Shanableh [21], Mumme et al [22], and Escala et al [23]. However, none of these works have reported extensively on the effect of reaction time coupled to the mild HTC condition.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Value-Added Products from Hydrothermal Carbonization of Sewage Sludge

Saetea

Tippayawong

2013

ISRN Chemical Engineering

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This paper is about the conversion of wet waste stream into valuable products via thermal processing. Hydrothermal carbonization of sewage sludge was carried out at 200 ∘ C and 2.1 MPa in a closed reactor for 1-6 h. Main products were in solid and liquid phases. The resulting hydrochar was shown to have H/C and O/C ratios moving towards natural lignite, improved energetic content, and adsorption property in terms of iodine number. The aqueous solution was found to contain high concentration of plant food nutrients, especially nitrogen and potassium. They may be desirable for subsequent fuel and chemical production as well as applications in agriculture. The study shows that valuable products can be generated successfully from sewage sludge using hydrothermal carbonization.

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“…But problems such as the decline in available land for construction of new landfills and the generation of ash with a high content of heavy metals and general toxicity by the incinerators have made these methods impracticable (Wei et al, 2003). Some new technologies, such as thermal processes (Neyens and Baeyens, 2003), ozonation (Ahn et al, 2002), chlorination (Saby et al, 2002), bead mill processes (Jung et al, 2001) and reactions in high-temperature and high-pressure (HTHP) water (Shanableh, 1999), have been studied with a view to solubilizing and mineralizing the excess sludge.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the ion product of water decreases, favoring hydrolytic reactions (Savage et al, 1995). However, HTHP water has been studied just from the viewpoint of solubilization and COD reduction of the treated excess sludge (Shanableh, 1999). Evaluations of the change in content have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Biological phosphate removal using a degradable carbon source produced by hydrothermal treatment of excess sludge

Haraguchi

Fujita

Daimon

et al. 2006

Braz. J. Chem. Eng.

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-The possibility of reusing excess sludge treated by hydrothermal reaction for the purpose of improving the efficiency of the enhanced biological phosphate removal (EBPR) process was investigated. Excess sludge from a fish-processing industry located in Japan was treated in high-temperature and high-pressure water, at a reaction temperature ranging from 200 to 400 o C, a pressure of 1.8 to 30MPa and a constant reaction time of 7 min. For the conditions tested, the results showed that when the reaction temperature was increased the content of readily biodegradable substrate in the total COD Cr increased. In addition, the amount of some volatile fatty acids (VFAs) produced by the hydrothermal reaction increased as reaction temperature increased. From the phosphate release tests under anaerobic conditions, it was possible to demonstrate that not only the VFAs, but also the readily and slowly biodegradable substrates are used as potential carbon source by the phosphate-accumulating organisms (PAOs).

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Production of useful organic matter from sludge using hydrothermal treatment

Cited by 115 publications

References 14 publications

Minimization of excess sludge production for biological wastewater treatment

Minimization of excess sludge production for biological wastewater treatment

Recovery of Value-Added Products from Hydrothermal Carbonization of Sewage Sludge

Biological phosphate removal using a degradable carbon source produced by hydrothermal treatment of excess sludge

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