Effect of moisture content in sewage sludge on air gasification

Xie, Liping; Li, Tao; Gao, Jian-dong; Fei, Xuening; Wu, Xia; Jiang, Yue

doi:10.1016/s1872-5813(10)60048-5

Cited by 46 publications

(22 citation statements)

References 6 publications

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“…Furthermore, the high concentration of H 2 and low temperature conditions favor the formation of CH 4 via the exothermic reaction (g3), and hence increasing the concentration of CH 4 in the producer gas; this result is in a good agreement with the literature. 40,41 Conversely, the producer gas composition produced from the cogasification of dried sewage sludge and wood chips is not significantly different from that produced from the gasification of wood chips. However, it can be observed that the amount of the producer gas was slightly decreased during the cogasification of dried sewage sludge and wood chips.…”

Section: Results and Discussion Experimental Resultsmentioning

confidence: 96%

Co‐gasification of woody biomass and sewage sludge in a fixed‐bed downdraft gasifier

et al. 2015

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Experimental and numerical studies of cogasification of woody biomass and sewage sludge have been carried out. The gasification experiments were performed in a fixed-bed downdraft gasifier and the experimental results show that 20 wt % dried sewage sludge in the feedstock was effectively gasified to generate producer gas comprising over 30 vol % of syngas with an average lower heating value of 4.5 MJ/Nm 3 . Further increasing sewage sludge content to 33 wt % leads to the blockage of gasifier, which is resulted from the formation of agglomerated ash. The numerical models were then developed to simulate the reactions taking place in four different zones of the gasifier (i.e., drying, pyrolysis, combustion, and reduction zones) and to predict the producer gas composition and cold gas efficiency. The deviation between the numerical and experimental results obtained was lower than 10%.a Typical sewage sludge examples were collected from Ulu Padan wastewater treatment plant, Singapore.

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Section: Results and Discussion Experimental Resultsmentioning

confidence: 96%

Co‐gasification of woody biomass and sewage sludge in a fixed‐bed downdraft gasifier

et al. 2015

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“…(1)). Therefore, the CO production was less than its consumption, led to a decrease in CO content [16].…”

Section: Gasesmentioning

confidence: 99%

Effect of moisture content on the characterization of products from the pyrolysis of sewage sludge

Xiong

Jiang

Zhang

et al. 2013

Journal of Analytical and Applied Pyrolysis

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“…The highest ash and water content were found in the stalk. A high water content increases the energy requirements to carry out the gasification, decreasing the efficiency of the plant, but on the other hand, it improves the synthesis gas quality by increasing the content of CO 2 , CH 4 and H 2 [20] and decreasing hydrocarbons and tars levels. In order to optimize the gasifier operation, Pfeifer et al [21] determined the optimum content equal 20% to 40% by weight at low temperatures heating.…”

Section: Resultsmentioning

confidence: 99%

Behavior of Heavy Metals during the Agro-Industrial Wastes Gasification

Echegaray¹,

Costante²,

Saffe³

et al. 2013

OJMetal

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The characterization analysis of three agro-industrial wastes was performed in order to study its thermal gasification. Some analyses such as determination of Ca, K and Mg concentration and determination of three representative toxic metals concentration Cd, Cr and Pb in all its oxidation states and the fundamental state, were carried out. The heavy metals concentration was also determined in the ashes obtained during the gasification process. The mobility of these elements was studied through three leaching tests. The behavior of heavy metals, sulfur and chlorine compounds, was predicted considering the presence of water vapor, syngas, Ca, Mg, K, Si, Al and other ash components. The heavy metals are not more concentrated in the gasification ash; these pollutants are released during this process. Ca, Mg and K presence in these residues would promote the pollutants retention. The ash of the studied waste can be disposed in controlled landfills or used in road construction, according to the obtained results during the leaching test DIN-DEV S4. The obtained results in the leaching test EPA 1311 TLCP classify these gasification ashes as no toxic waste.

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Effect of moisture content in sewage sludge on air gasification

Cited by 46 publications

References 6 publications

Co‐gasification of woody biomass and sewage sludge in a fixed‐bed downdraft gasifier

Co‐gasification of woody biomass and sewage sludge in a fixed‐bed downdraft gasifier

Effect of moisture content on the characterization of products from the pyrolysis of sewage sludge

Behavior of Heavy Metals during the Agro-Industrial Wastes Gasification

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