Ten-years monitoring of MSWI bottom ashes with focus on TOC development and leaching behaviour

Glauser, Andreas; Weibel, Gisela; Eggenberger, Urs

doi:10.1016/j.wasman.2020.07.038

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Present results indicate an incomplete decomposition of organic matter, if the SMT protocol provides enough accurate data. The results are more in line with the findings that bottom ash from incinerated municipal sludge can leach dissolved organic carbon up to 20 mg L −1 (Glauser et al, 2020) for long periods of time when produced in an incineration plant. Similar conditions seem to have been present in the chamber furnace process which would indicate that some organic carbon may in fact remain even after incineration at 1000°C.…”

Section: Phosphorus Speciationsupporting

confidence: 89%

Phosphorus speciation in sewage sludge from three municipal wastewater treatment plants in Sweden and their ashes after incineration

et al. 2021

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Given the high efficiency in phosphorus removal at municipal wastewater treatment plants (MMWWTP), sewage sludge constitutes a promising resource for phosphorus (P) recovery. Sewage sludge is, however, a complex matrix and its direct use as fertiliser is limited by its content of metals/metalloids and organic pollutants. In order to increase its usability as a potential resource of P, there is a need for increased knowledge on phosphorus speciation in these matrices. The sludge composition is highly influenced by local conditions (i.e. wastewater composition and treatment method), and it is therefore important to study sludge from several MMWWTPs. In this study, three different protocols for sequential extraction were utilised to investigate the chemical speciation of phosphorus in sludge from three different MMWWTP sludges in Sweden, as well as in corresponding ashes following incineration. The results showed that the total amounts of phosphorus ranged from 26 to 32 mg g−1 sludge (dry weight), of which 79–94% was inorganically bound (IP). In the sludge, 21–30% of the IP was associated with calcium (Ca-P), which is the preferred species for fertiliser production. Following incineration, this fraction increased to 54–56%, mainly due to transformation of iron-associated phosphorus (Fe-P), while aluminium-associated species of phosphorus (Al-P) remained unaltered. The results from this study confirm that incineration is a suitable treatment for sewage sludge in terms of potential phosphorus recovery.

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Section: Phosphorus Speciationsupporting

confidence: 89%

Phosphorus speciation in sewage sludge from three municipal wastewater treatment plants in Sweden and their ashes after incineration

et al. 2021

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“…The average concentrations of Cu under CO 2 -saturated conditions are 25% higher than under the alkaline conditions, present in batch tests with deionized H 2 O (Figure 4c). This is because at pH 6 Cu is still mostly sorbed to HFO, while under alkaline conditions Cu leaching is enhanced by complexation of Cu with organic ligands such as DOC (Johnson et al, 1996; van Zomeren and Comans, 2004; Dijkstra et al, 2006; Glauser et al, 2020). In fact, Cu concentrations in fractions with high DOC concentrations are even higher under alkaline than under CO 2 -saturated conditions.…”

Section: Resultsmentioning

confidence: 99%

Effects of enhanced metal recovery on the recycling potential of MSWI bottom ash fractions in various legal frameworks

2021

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In recent years, complex new bottom ash treatment processes for enhanced metal recovery have been implemented in Switzerland, producing residual bottom ash fractions with various qualities. This study focusses on three different treatment processes by characterizing all arising fractions in detail. Thereby the factors influencing the composition of these fractions are identified and their recycling potential in Switzerland is investigated. However, high legislative requirements on total contents of heavy metals represent a high barrier for bottom ash recycling in Switzerland. Therefore, the recycling potential is further evaluated based on the waste legislation applied in the Netherlands, where recycling of bottom ash has a long tradition. There, threshold values for bottom ash recycling are based on leachate concentrations and not on total contents as in Switzerland. However, Swiss Waste Legislation also knows threshold values based on leachate concentrations for certain waste materials. The leaching tests applied in these two countries, however, are different. The comparison of both leaching tests reveals that the setup and conditions, especially the considered pH range, significantly influence the leaching of heavy metals. With emphasis on problematic pollutants, the possibilities for new applications of these fractions are evaluated based on Swiss and Dutch legal threshold values. The comparison within the legal frameworks of these two countries allows recognizing opportunities and risks related to bottom ash recycling.

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“…The TOC is a direct and reliable indicator that has been widely used to characterize organic pollution in water bodies and sediments [38] because of its potential hazards to humans [39], which means the VOCs are related to the river pollution in the Huangshui River. TOC can come from food waste [40] and released oils [41] and metals, such as Cu, Cr, Al, and Ni [42,43], which are related to pollution by humans. In addition, NO 2 − -N is often produced by sewage discharge, including vast amounts of agriculture and the breeding of cattle and sheep [44].…”

Section: Impact Of Environmental Factors On Vocsmentioning

confidence: 99%

Human Activities Aggravate VOC Pollution in the Huangshui River of the Tibetan Plateau

Yang

Deng

et al. 2022

Sustainability

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Many xenobiotic compounds can threaten human health and natural ecosystems. The ability to predict the level of human activities and identify major impact factors is crucial for the design of pollutant risk-reduction plans. In this study, a total of 25 volatile organic compounds (VOCs) including eight alkenes, six alkanes, and eleven aromatics were identified at 11 monitoring locations along the Huangshui River of the Tibetan Plateau. GC-MS analysis was applied to detect the concentrations of the VOCs. The results showed that the alkene, alkane, and aromatic concentrations in the sediment were significantly higher than in the water in all seasons (p < 0.001). The VOC concentrations in summer were significantly higher than in spring and winter (p < 0.01). In addition, several VOCs were found to surpass the national standard, i.e., bromoform reached 312.43 μg/L in water during the summer (the national standard is 100 μg/L), carbon tetrachloride was 209.58 μg/L (the national standard is 2 μg/L), and vinyl chloride was 10.99 μg/L (the national standard is 5 μg/L), which were all related to human activities. Principal component analysis (PCA) was used to comprehensively evaluate the water quality and the VOCs. The total organic carbon (TOC) was found to be responsible for the presence of the VOCs in the river, accounting for 77.93%, 81.97%, and 82.13% of the total variance in the datasets in spring, summer, and winter, respectively.

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Ten-years monitoring of MSWI bottom ashes with focus on TOC development and leaching behaviour

Cited by 5 publications

References 10 publications

Phosphorus speciation in sewage sludge from three municipal wastewater treatment plants in Sweden and their ashes after incineration

Phosphorus speciation in sewage sludge from three municipal wastewater treatment plants in Sweden and their ashes after incineration

Effects of enhanced metal recovery on the recycling potential of MSWI bottom ash fractions in various legal frameworks

Human Activities Aggravate VOC Pollution in the Huangshui River of the Tibetan Plateau

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