The effects of clay amendment and composting on metal speciation in digested sludge

Qiao, Liang

doi:10.1016/s0043-1354(96)00290-4

Cited by 51 publications

(31 citation statements)

References 17 publications

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“…At these redox conditions, Mn is largely present in the reduced, more soluble, bivalent form Mn 2+ (Lindsay, 1979). The results for Ni are not in accordance with those of other studies, where 11.3 ± 0.3 it was found that Ni in organic waste materials was mostly associated with the oxidisable and the residual phases (Qiao and Ho, 1997;Pérez-Cid et al, 1999, Tisdell andBreslin, 1995). Furthermore, unusually, a considerable amount of Pb was found in the acid extractable fraction.…”

Section: Sludge Characterisationcontrasting

confidence: 69%

“…During the first nine months of sludge ageing, organic bound Cu, the main fraction in the raw material (89% of total Cu) and in organic wastes in general (Tack and Verloo, 1993;Tisdell and Breslin, 1995), transformed mainly into acid extractable and reducible Cu (Figure 2(a)). This phenomenon was also observed by Qiao and Ho (1997) when they composted a sewage sludge. The release of organic bound Cu may be caused by the decomposition of easily degradable organic matter into more soluble organic chelates.…”

Section: Effect Of Ageing On Metal Fractionation In Sludgesupporting

confidence: 58%

“…Only Cu and Cr were retrieved largely from the least mobile fractions. The generally observed high metal mobility is contradictory to the findings of Qiao and Ho (1997) who reported that metals in sludge are generally found in very stable, insoluble forms which are mostly associated with the organic fraction, that fail to be extracted with DTPA, an extractant known to indicate plant available metals (Singh et al, 1998).…”

Section: Sludge Characterisationmentioning

confidence: 70%

“…Some researchers claim that upon mineralisation, the metals previously bound to the organic matter will be remobilised into the environment (Fang and Wong, 1999;Qiao and Ho, 1997;He et al, 1992;Teal and Peterson, 1993), whereas others predict such metals will be further immobilised due to the formation of less soluble complexes with the strongly humified material formed and by being incorporated into the crystal lattices of the residual phase (Paré et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Assessment of metal speciation evolution in sewage sludge dewatered in vertical flow reed beds using a sequential extraction scheme

Staelens

Parkpian

2000

Chemical Speciation & Bioavailability

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Section: Sludge Characterisationcontrasting

confidence: 69%

Section: Effect Of Ageing On Metal Fractionation In Sludgesupporting

confidence: 58%

Section: Sludge Characterisationmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of metal speciation evolution in sewage sludge dewatered in vertical flow reed beds using a sequential extraction scheme

Staelens

Parkpian

2000

Chemical Speciation & Bioavailability

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“…The combination of multiple methods can improve the immobilizing effect. Chemical compounds such as zeolite [122][123][124], lime [125], lime and sodium sulfide [126], and red mud [127] are often used as amendments to improve compost quality by transforming the mobile form of metals to less mobile or residual forms.…”

Section: Synergistic Effects Of Different Immobilizing Methodsmentioning

confidence: 99%

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

2017

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Abstract:The safe disposal of sewage sludge during the process of municipal wastewater treatment has become one of the major concerns of increased production. Land application was thought of as a more economical method for sewage sludge disposal than landfill and incineration. However, the presence of heavy metals in sewage sludge restricted the use of land application. The environmental risk of heavy metals was dependent on their contents, chemical speciations, and soil characteristics. Composting and chemical immobilization were the commonly used methods to immobilize the heavy metals in sewage sludge. The immobilization mechanism and speciation transformation of heavy metals during the composting process were presented. Aluminosilicate, phosphorus-bearing materials, basic compounds, and sulfides were reviewed as the commonly used chemical immobilizing agents. The problems that occur during the immobilization process were also discussed. The combination of different methods and the modification of chemical immobilizing agents both improved the fixation effect on heavy metals.

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Chemical Characterization of Biosolids from Three Spanish WWTPs: Transfer of Organics and Metallic Pollution from Urban Wastewater to Biosolids

Galvín¹,

López²,

Mellado³

2009

CLEAN Soil Air Water

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The production of biosolids in three Spanish wastewater treatment plants (WWTPs) has been investigated. Biosolids produced from the treatment of urban wastewater in Spain are usually intended for agricultural use. The reliable production of biosolids mainly depends on both the quantity of suspended solids and the organic load influent to the treatment systems. The quality of the generated biosolids was independent of both the amount of treated water and the treatment process applied, with 20 to 25% dried matter, and 60 to 75%, 7% and 4% of organic matter, N and P, respectively, of the total matter. The biosolids contained ca. 11 to 19 g/kg of total metals in the dry matter, with Fe, Zn, Cu and Mn representing 97% of all of the metals present, and Hg being the minority metal. Such biosolids had the ability to concentrate the organic matter and metals from the wastewater up to 417 and 869 times, respectively, and thus, can be used in agricultural practice.

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The effects of clay amendment and composting on metal speciation in digested sludge

Cited by 51 publications

References 17 publications

Assessment of metal speciation evolution in sewage sludge dewatered in vertical flow reed beds using a sequential extraction scheme

Assessment of metal speciation evolution in sewage sludge dewatered in vertical flow reed beds using a sequential extraction scheme

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Chemical Characterization of Biosolids from Three Spanish WWTPs: Transfer of Organics and Metallic Pollution from Urban Wastewater to Biosolids

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