Comparative study on the mobility and speciation of heavy metals in ashes from co-combustion of sewage sludge/dredged sludge and rice husk

Wang, Teng; Xue, Yongjie; Zhou, Min; Yuan, Yunjuan; Zhao, Suyun; Tan, Guolong; Zhou, Xian; Geng, Jiang; Wu, Shaopeng; Hou, Haobo

doi:10.1016/j.chemosphere.2016.11.070

Cited by 66 publications

(17 citation statements)

References 57 publications

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“…Copyrolysis of pig manure and rice straw considerably reduced in the biochar the extractable concentrations of bioavailable Cu and considerably reduced the concentration of interchangeable and carbonate-associated Zn as compared to pig manure biochar at the same temperatures [136]. e dilution effect reduced the total and bioavailable Cu and Zn concentration associated with the minerals, surface area, and surface functional groups of biochar that are believed to reduce the release of HMs by chemical extraction reagent [136][137][138][139]. Similarly, this was observed in the copyrolysis of sewage sludge with rice straw/ husks, with the addition of rice straw [140,141].…”

Section: Heavy Metal Concentrationmentioning

confidence: 99%

“…A single chemical extraction procedure does not reveal the total bioavailable HMs in the biochars, and therefore, to assess the potential risk and longterm stability of the biochars, the chemical speciation of HMs in the biochars need to be examined and assessed. Sequential extraction procedures have been successfully used to determine the extractable total and bioavailable HMs in manure [136][137][138][139].…”

Section: Environmental Implicationsmentioning

confidence: 99%

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Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Ndirangu

Liu

et al. 2019

Journal of Chemistry

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This paper aims at demonstrating the significance of biochar risk evaluation and reviewing risk evaluation from the aspects of pyrolysis process, feedstock, and sources of hazards in biochar and their potential effects and the methods used in risk evaluation. Feedstock properties and the resultant biochar produced at different pyrolysis process influence their chemical, physical, and structural properties, which are vital in understanding the functionality of biochar. Biochar use has been linked to some risks in soil application such as biochar being toxic, facilitating GHGs emission, suppression of the effectiveness of pesticides, and effects on soil microbes. These potential risks originate from feedstock, contaminated feedstock, and pyrolysis conditions that favor the creation of characteristics and functional groups of this nature. These toxic compounds formed pose a threat to human health through the food chain. Determination of toxicity levels is a first step in the risk management of toxic biochar. Various sorption methods of biochar utilized low-cost adsorbents, engineered surface functional groups, and nZVI modified biochars. The mechanisms of organic compound removal was through sorption, enhanced sorption, modified biochar, postpyrolysis thermal air oxidation and that of PFRs degradation was through activation, photoactive functional groups, magnetization, and hydrothermal synthesis. Emissions of GHGs in soils amended with biochar emanated through physical and biotic mediated mechanisms. BCNs have a significance in reducing the health quotient indices for PTEs risk contamination by suppressing cancer risk arising from consumption of contaminated food. The degree of environmental risk assessment of HM pollution in biomass and biochars has been determined by using potential ecological risk index and RAC while organic contaminant degradation by EPFRs was considered when assessing the environmental roles of biochar in regulating the fate of contaminants removal. The magnitude of technologies’ net benefit must be considered in relation to the associated risks.

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Section: Heavy Metal Concentrationmentioning

confidence: 99%

Section: Environmental Implicationsmentioning

confidence: 99%

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Ndirangu

Liu

et al. 2019

Journal of Chemistry

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“…explained in terms of low DOC levels in the dump resulting in immobility. However, leaching tests only predict potential mobility of metals and their availability to environmental systems under natural conditions [41], they do not fully reflect actual leaching in real environments [42]. Actual leachate contains xenobiotic organic compounds (XOCs) and heavy metals that can bioaccumulate and persist in the environment, and is known for toxicity, corrosivity, reactivity, flammability, carcinogenicity and other hazards [36].…”

Section: Asmentioning

confidence: 99%

Physico-chemical characteristics of fine fraction materials from an old crystal glass dumpsite in Sweden

Mutafela

Marques

Jani

et al. 2019

Chemistry and Ecology

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Physico-chemical characteristics of waste, particularly fine fraction (FF), from an old crystal glass waste dump in Sweden were studied to assess recycling or disposal alternatives. Hand-sorting of the waste indicated glass content of 44.1% while sieving established the FF as a more soil-like mix of glass and other materials constituting 33.3% of all excavated waste. The FF was around neutral pH with 24.4% moisture content, low values of Total Dissolved Solids, Dissolved Organic Carbon and fluorides, but hazardous concentrations of As, Cd, Pb and Zn according to the Swedish Environmental Protection Agency guidelines. While the FF leached metals in low concentrations at neutral pH, it leached considerably during digestion with nitric acid, implying leaching risks at low pH. Thus, the waste requires safe storage in hazardous waste class 'bank account' storage cells to avoid environmental contamination as metal recovery and other recycling strategies for the glass waste are being developed. The study could fill the information gap regarding preservation of potential resources in the ongoing , fast-paced excavation and relandfilling of heavy metal contaminated materials in the region.

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“…The theoretical calculation was in good agreement with the experimental data. The high content of heavy metal elements in SS has always been the limiting factor for its reuse; thus, studies on this topic are frequently reported . From Wang et al, low temperature (800°C) and low oxygen concentration (10%) can be concluded to achieve reasonable control of heavy metal elements, but at the expense of reducing the combustion efficiency and destroying the integrity of the whole combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…The high content of heavy metal elements in SS has always been the limiting factor for its reuse; thus, studies on this topic are frequently reported. 19,20 From Wang et al,21 low temperature (800°C) and low oxygen concentration (10%) can be concluded to achieve reasonable control of heavy metal elements, but at the expense of reducing the combustion efficiency and destroying the integrity of the whole combustion process. Jing-Yong Liu et al 22 reported that sulphur can promote cadmium fixation in slag in the form of CdS and aluminosilicates among others in a local-reducing atmosphere.…”

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confidence: 99%

Experimental investigation on co-combustion kinetics and gas emission law of sewage sludge-bituminous coal

Yang

et al. 2018

Int J Energy Res

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Summary The kinetic mechanism of the co‐combustion of sewage sludge (SS) and bituminous coal (BC) is studied. The separate combustion process of the SS can be divided into four stages, as follows: moisture precipitation, volatile precipitation, non‐volatile substance precipitation, and fixed carbon burnout. During the co‐combustion of the mixture, SS and BC maintained their respective combustion properties. The SS can significantly improve the ignition and combustion performance of BC. Through Fourier transform infrared spectroscopy analysis, we found that the main combustible component in the SS is the volatile organic matter, and the main emission product is CO2. These results provide a theoretical basis for the new technology of combined power generation of SS energy recycling.

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Comparative study on the mobility and speciation of heavy metals in ashes from co-combustion of sewage sludge/dredged sludge and rice husk

Cited by 66 publications

References 57 publications

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Physico-chemical characteristics of fine fraction materials from an old crystal glass dumpsite in Sweden

Experimental investigation on co-combustion kinetics and gas emission law of sewage sludge-bituminous coal

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