Fractionation of heavy metals in sewage sludge and their removal using low-molecular-weight organic acids

Zaleckas, Ernestas; Paulauskas, Vytautas; Sendžikienė, Eglė

doi:10.3846/16486897.2012.695734

Cited by 23 publications

(18 citation statements)

References 35 publications

(28 reference statements)

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“…The regression models were statistically significant for release of Mg, K, Al, Fe and Zn (R [17] reported that the heavy metal extraction efficiency increased with an increasing solution concentration. On the other hand, acid/sludge ratio had negative effect on the release of Fe, Zn and Al.…”

Section: Optimization Of Conditions For Release Of High Phosphorus Anmentioning

confidence: 98%

Phosphorus Recovery from Hydrolysed Sewage Sludge Liquid Containing Metals using Donnan Dialysis

Uysal¹,

Tuncer²,

Kır³

et al. 2016

Proceedings of the 2nd World Congress on New Technologies

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Hydrolysis of phosphorus and metals from anaerobically digested sewage sludge was tested using inorganic acids (H 2 SO 4 , HCl, and HNO 3) and organic acids (citric, oxalic, and acetic). Then, the optimize conditions for release of high phosphorus and low metals from digested sludge using H 2 SO 4 by Box-Behnken design was investigated. Optimum PO 4-P and metals (Ca, Mg, Na, K, Al, Fe and Zn) release was obtained at H 2 SO 4 0.3 M, acid/sludge ratio (mL/g) 10/1 and mixing time 90 min, respectively. Donnan dialysis having a Nafion 117 cation exchange membrane was employed the selective separation of released PO 4-P and metals in the hydrolysed sewage sludge liquid obtained at optimum conditions. HCl at different concentrations (0.1 and 1.0 M) were used in receiver side. High levels of metals (Ca 78.73%, Mg 38.11%, Na 49.43%, K 64.62%, Al 97.59% and Zn 34.73%) were passed the receiver side using 1 M HCl for 24 h. Hence, it was observed that selective separation of phosphate and metals from digested sludge using Donnan dialysis process was achieved for phosphorus recovery.

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Section: Optimization Of Conditions For Release Of High Phosphorus Anmentioning

confidence: 98%

Phosphorus Recovery from Hydrolysed Sewage Sludge Liquid Containing Metals using Donnan Dialysis

Uysal¹,

Tuncer²,

Kır³

et al. 2016

Proceedings of the 2nd World Congress on New Technologies

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“…EDTA and EDDS are strong chelating agents that form multidentate ligands with metal cations. It is expected that molecules with more carboxyl groups have higher extracting capacity than a molecule with fewer carboxyl groups [34], which could explain the higher efficiency for EDTA and CA (four and three carbonyl groups, respectively). However, this would suggest that EDDS (4 carbonyl groups) should behave similar to the EDTA, which is not the case (12 mg•kg −1 ).…”

Section: Batch Processmentioning

confidence: 99%

A Comparison of Batch, Column and Heap Leaching Efficiencies for the Recovery of Heavy Metals from Artificially Contaminated Simulated Soil

Mgbeahuruike¹,

Barrett²,

Potgieter³

et al. 2019

JEP

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This paper shows the effect of three different leaching processes and 4 different leaching agents on the extraction of five metals of interest from an artificially contaminated simulated soil (SS). For the first time, it is shown that these processes and extractants could be compared directly, as the soil was a constant variable. The interest of this study is that the recovery of metals that are of importance in the circular economy, have been demonstrated from an unusual resource, soil. Metal reserves are constantly decreasing worldwide and alternative resources becoming topical. Urban mining of contaminated land and/or waste sites, therefore, becomes an attractive choice for metal extraction/recovery. This study has shown that metal extraction of up to 50% efficiency could be achieved. Furthermore, EDTA proved to be the best overall extractant when used in batch leaching processes. However, different metals showed preferential recoveries with specific processes and extractants. Therefore the results suggest that the design of a contaminant-specific leaching process performed in a sequential manner could not only leach the metals, but also achieve reasonable separation of the metals.

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“…Thus, the integrated utilization of acids or reagents should be deliberately selected to fulfill the requirement of target contaminants removal on one hand, and soil ecological protection on the other hand. This justifies the introduction of Low molecular weight organic acids such as acetic acid, oxalic acid, which constitute a group of weak organic acids [63] and chelating reagents such as nitrilotriacetic acid (NTA) [33], sodium tripolyphosphates (STPP) and ethylenediaminetetraacetic acid (EDTA) [33,63]. The use of weak acids showed mitigated results even though promising.…”

Section: Chemical Leaching and Leaching Agentsmentioning

confidence: 99%

Metal-Contaminated Soil Remediation: Phytoremediation, Chemical Leaching and Electrochemical Remediation

Ifon¹,

Togbé²,

Tometin³

et al. 2019

Metals in Soil - Contamination and Remediation

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Soil contamination has led to serious land tenure problems, reduction in land usability for agricultural production; as a consequence, food insecurity is nowadays a global challenge. Indeed, with rapid population growth across the world, the food demand for consumption has drastically increased and traditional ways of producing food cannot meet with the actual demand. Industrialization has been acknowledged as a way out to sustain humanity with food. Unfortunately, the later has further turn into a threat to the environment. In effect, several potentially toxic elements (PTE) are being released in the environment and soil systems; and arable or agricultural lands are getting restraint, limited and scarce. Nowadays, there is a consensus on remediating contaminated lands with PTE, mainly inorganic contaminants, metals. The state at which a metal is found in the soil greatly influences its bioavailability, interaction with plants and the level at which it will threaten (toxicity) the environment and thus human. It even defines the remediation approaches to be applied for the soil restoration. This chapter will provide an insight on the occurrence of PTE in the soil, bioavailability and remediation approaches namely phytoremediation, chemical leaching and electrochemical remediation; and finally highlight the future research direction on this topic.

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Fractionation of heavy metals in sewage sludge and their removal using low-molecular-weight organic acids

Cited by 23 publications

References 35 publications

Phosphorus Recovery from Hydrolysed Sewage Sludge Liquid Containing Metals using Donnan Dialysis

Phosphorus Recovery from Hydrolysed Sewage Sludge Liquid Containing Metals using Donnan Dialysis

A Comparison of Batch, Column and Heap Leaching Efficiencies for the Recovery of Heavy Metals from Artificially Contaminated Simulated Soil

Metal-Contaminated Soil Remediation: Phytoremediation, Chemical Leaching and Electrochemical Remediation

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