Characteristics of four alkaline biosolids produced from sewage sludge

Hsiau, Ping-Chin; Lo, Shang‐Lien

doi:10.1016/s0921-3449(97)00035-9

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…It is confirmed by the fact that at 800 °C, carbonization yield of the viscous liquid sludge and limed sludge carbonization yields with respect to sludge mass before liming are equal. Finally, Hsiau and Lo(25) have observed the formation of relatively high quantities of calcium carbonates when sewage sludge is mixed with lime.…”

mentioning

confidence: 99%

Structure Characterization and Adsorption Properties of Pyrolyzed Sewage Sludge

Rio

Faur

Coq

et al. 2005

Environ. Sci. Technol.

116

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Sewage sludges produced from wastewater treatment plants continue to set environmental problems in terms of volume and way of reuse. Thermal treatment of sewage sludge is considered as an attractive method in reducing sludge volume, and at the same time, it produces reusable byproducts. This paper deals with porous carbonaceous materials production from sewage sludge by pyrolysis (or carbonization) process with a goal of different industrial applications. Carbonization experiments were carried out on two kinds of sludge, namely viscous liquid sludge and limed sludge by varying carbonization temperature between 400 degrees C to 1000 degrees C. The porous structure and surface chemistry of the materials obtained were characterized using nitrogen adsorption, scanning electron microscopy, elemental analysis, Boehm titration, and pH of zero point of charge determination. The results show that basic character of the carbonized residues increases with increasing carbonization temperature. Then, carbonization allows specific surface area and pore volumes to be developed. Carbonized viscous liquid sludge and carbonized limed sludge are mainly mesoporous in nature, with specific surface areas reaching about 100 m2 g(-1) and 60 m2 g(-1), respectively. Finally, adsorption experiments, in aqueous solution, were carried out and show that carbonized viscous liquid sludges and limed sludge remove effectively the metallic ion Cu2+, acid and basic dyes, and phenol. Pyrolyzed sludges properties seem to be encouraging for the preparation of activated carbon by physical activation process.

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mentioning

confidence: 99%

Structure Characterization and Adsorption Properties of Pyrolyzed Sewage Sludge

Rio

Faur

Coq

et al. 2005

Environ. Sci. Technol.

116

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“…Of these 208 mineral phases, 8 were found to be in possible equilibrium (i.e., À1 < SI < 1 for most pH values): quartz (SiO 2 ), chalcedony (SiO 2 ), cristobalite (SiO 2 ), gypsum (Ca-SO 4 Á 2H 2 O), calcite (CaCO 3 ), zincite (ZnO), ZnCO 3 , and Ca 3 (PO 4 ) 2 (am2). Quartz has been reported to be the main mineral component in biosolids (Hsiau and Lo, 1997). Carbonate, silicate, and phosphate phases have also been reported as partially responsible for retention of trace metals in biosolids (Merrington and Smernik, 2004;Basta et al, 2005;Hettiarachchi et al, 2006).…”

Section: Possible Dissolved Phasesmentioning

confidence: 99%

Geochemical Modeling of Trace Element Release from Biosolids

Apul

Diaz

Gustafsson

et al. 2010

Environmental Engineering Science

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Biosolids-borne trace elements may be released to the environment when biosolids are used as fertilizers in farm land. Trace element leachate concentrations from biosolids are known to be limited by both organic and inorganic sorbent surfaces; this experimental evidence has not been previously verified with geochemical modeling of sorption reactions. In this study, pH-dependent leaching experiments and sorption isotherm experiments were coupled with a multisurface geochemical modeling approach. Biosolids samples were obtained from Toledo and Chicago wastewater treatment plants; their sorbent surfaces were defined and modeled as a combination of organic matter (OM) and Fe-, Al-, and Mn-oxides. The multisurface geochemical modeling approach was partially successful in predicting the pH-dependent leachate concentrations of As, Cd, Cr, Cu, Mo, Ni, and Zn. Both modeled and experimental data indicated that As and Mo in biosolids were bound to Fe-oxides; Cd, Cr, and Cu were bound mainly to OM; and as pH increased the fractions of Cd and Cu bound to Fe-oxides in the biosolids matrix increased. Ni and Zn were distributed between OM and Fe-oxides, and the percentage of each fraction depended on the pH. This study showed that the multisurface geochemical model could be used to generate As (and to a lesser extent Cd) Freundlich isotherm parameters for biosolids. However, the composition and reactivity of solid and dissolved OM was identified as a source of uncertainty in the modeling results. Therefore, more detailed studies focusing on the reactivity of isolated biosolids OM fractions with regard to proton and metal binding are needed to improve the capability of geochemical models to predict the fate of biosolids-borne trace metals in the environment.

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“…It was suggested that metals such as Cu, with high affinity for organic matter, became more labile following amendment, whilst those with lower affinity for organics (e.g. Zn) were successfully stabilised (Hsiau and Lo, 1997;.…”

Section: 1021mentioning

confidence: 99%