Fate and distribution of heavy metals during thermal processing of sewage sludge

Udayanga, W.D. Chanaka; Veksha, Andrei; Giannis, Apostolos; Lisak, Grzegorz; Chang, Victor Wei-Chung; Lim, Teik−Thye

doi:10.1016/j.fuel.2018.04.045

Cited by 222 publications

(57 citation statements)

References 241 publications

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“…The increase in temperature during pyrolysis of sewage sludge leads to the transformation of less stable heavy metals to more stable forms in the biocarbon. The degree of conversion and trends are individual for each metal and for particular materials tested [30].…”

Section: Appl Sci 2019 9 X For Peer Review 6 Of 16mentioning

confidence: 99%

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Influence of Biomass Incineration Temperature on the Content of Selected Heavy Metals in the Ash Used for Fertilizing Purposes

2019

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This article presents the influence of ash-forming temperature on ash content and the content of selected heavy metals. The biomasses most commonly used in low-power heating boilers, such as miscant, oak, pine, sunflower husk, wheat straw and willow, were selected for the research. The biomass was incinerated at temperatures of 600 °C, 700 °C, 800 °C, 900 °C and 1000 °C, using the X-ray Fluorescence Spectrometer (XRF) for the measurement of element content. The results show that the content of heavy metals in the examined ash was not excessive and could not be considered as potentially dangerous. As the ash-forming temperature increased, the content of Zn, Cd, Cu and Pb decreased, which indicates that, at higher temperatures, they went into the gas phase. Cr, Ni and Fe were thermally stable and less volatile, thus the ashes were enriched with them as the ash-forming temperature increased.

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Section: Appl Sci 2019 9 X For Peer Review 6 Of 16mentioning

confidence: 99%

“…According to the authors of [30], among the operation factors (temperature, heating rate, reaction time, etc. ), temperature is the main factor in the redistribution of heavy metals.…”

Section: Appl Sci 2019 9 X For Peer Review 6 Of 16mentioning

confidence: 99%

Influence of Biomass Incineration Temperature on the Content of Selected Heavy Metals in the Ash Used for Fertilizing Purposes

2019

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“…For HTL, owing to the lower operating temperatures as compared to gasification, most of the heavy metals are either present in the solid or liquid phase. Hence, most studies worked on determining the distribution among the two phases and the effects of changing parameters, such as operating temperature, solvent type and catalyst type [9]. Leng et al [102] investigated the distribution of heavy metals (Pb, Zn, Cu and Ni) in bio-oils and bio-chars obtained from the liquefaction of sewage sludge in different solvents (acetone and ethanol).…”

Section: Effect On Heavy Metals In the Wastewater Sludgementioning

confidence: 99%

“…1), they are unable to utilize the potential of the sludge to the fullest [2]. Additionally, the presence of harmful substances such as pathogens, hormones, antibiotics, heavy metals, and persistent organic pollutants in the sludge acts as a further deterrent against the continued employment of some of the current disposal methods [6][7][8][9][10]. The utilization of the sludge in the construction industry is another established pathway with specific applications including co-combustion as a kiln fuel, in cement kilns for mortar production as well as stabilization by combining with wet cement [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Resource recovery and waste-to-energy from wastewater sludge via thermochemical conversion technologies in support of circular economy: a comprehensive review

2020

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With the rapid rise in global population over the past decades, there has been a corresponding surge in demand for resources such as food and energy. As a consequence, the rate of waste generation and resultant pollution levels have risen drastically. Currently, most organic solid wastes are either land applied or sent to landfills, with the remaining fraction incinerated or anaerobically digested. However, with the current emphasis on the reduction of emissions, nutrient recovery, clean energy production and circular economy, it is important to revisit some of the conventional methods of treating these wastes and tap into their largely unrealized potential in terms of environmental and economic benefits. Wastewater sludge, with its high organic content and fairly constant supply, provides a great opportunity to implement some of these strategies using thermochemical conversion technologies, which are considered as one of the alternatives for upcycling such waste streams. This paper summarizes the results of prominent studies for valorizing wastewater sludge through thermochemical conversion technologies while drawing inferences and identifying relationships between different technical and operating parameters involved. This is followed by sections emphasizing the environmental and economic implications of these technologies, and their corresponding products in context of the broader fields of waste-to-energy, nutrient recycling and the progress towards a circular economy.

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“…Generally, the concentration of heavy metals in sludge is affected by the treatment plant potentiality and type of influent wastewater, i.e. domestic or industrial (Spanos et al, 2016;Chanaka Udayanga et al, 2018). Process upgrading in the wastewater treatment circuit may lead to an increase of metal content in the sludge.…”

Section: Heavy Metalsmentioning

confidence: 99%

Monitoring of Heavy Metals, Eox and Las in Sewage Sludge for Agricultural Use: A Case Study

et al. 2020

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Subsequent to the increasing diffusion of wastewater treatment, particularly in high- and middle-income countries, the sewage sludge generated should be treated and valorised in an ecological and economic way, thus contributing to the circular economy. In this study, the monitoring of Heavy Metals (HM), Extractable Organic Halogens (EOX) and Linear Alkylbenzene Sulphonate (LAS) in sewage sludge from 10 different wastewater treatment plants located in Friuli Venezia Giulia (Italy) was reported, and their macronutrient content provided. The obtained results showed, for all tested samples, that HM content in sewage sludge was below the maximum permitted limits provided for by Italian and European regulations for agricultural reuse. Comparison with a similar monitoring campaign carried out in 2006 revealed how, while wastewater treatment plants efficiently resolved water pollution, they accumulated heavy metals and other persistent toxic compounds in sludge, thus restricting their potential reuse. Consequently, consistent and regular sludge monitoring should be undertaken to prevent soil and groundwater contamination. These outcomes could be of particular relevance for the future perspective of agricultural reuse of sewage sludge in waste management practices.

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Fate and distribution of heavy metals during thermal processing of sewage sludge

Cited by 222 publications

References 241 publications

Influence of Biomass Incineration Temperature on the Content of Selected Heavy Metals in the Ash Used for Fertilizing Purposes

Influence of Biomass Incineration Temperature on the Content of Selected Heavy Metals in the Ash Used for Fertilizing Purposes

Resource recovery and waste-to-energy from wastewater sludge via thermochemical conversion technologies in support of circular economy: a comprehensive review

Monitoring of Heavy Metals, Eox and Las in Sewage Sludge for Agricultural Use: A Case Study

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