Evolution of heavy metals during thermal treatment of manure: A critical review and outlooks

Li, Shuhui; Zhang, Dongsheng; Li, Longcheng; Ling, Wu; Liu, Fen; Zeng, Xinyi; Wang, Hua; Zhu, Yan; Xiao, Zhihua

doi:10.1016/j.chemosphere.2020.125962

Cited by 78 publications

(40 citation statements)

References 120 publications

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“…Cultivation of crops in contaminated soils can cause bioaccumulation of heavy metals in the edible parts of crops which are used as feed for livestock. Thus, it may cause heavy metal pollution in animal manures (Li et al 2020;Wajid et al 2020). The usage of these plants and animals may affect the health of human (Shad et al 2014;Ahmad et al 2018a, b).…”

Section: Introductionmentioning

confidence: 99%

A study on the transfer of chromium from meadows to grazing livestock: an assessment of health risk

Khan

Ahmad

Siddique

et al. 2020

Environ Sci Pollut Res

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The present investigation was performed in different district of Punjab to determine the chromium level in soil, forages, and blood plasma of the small ruminants (goat and sheep). The results showed that the mean concentrations of chromium in the soil of Sargodha, Mianwali, and Bhakkar districts were ranged from 1.8 to 2.3, 3.01 to 4.99, and 2.04 to 2.87 mg/kg, respectively. The chromium level was higher in Mianwali compared with Sargodha and Bhakkar. The mean concentrations of chromium in forages which were used for feeding purposes were found between 0.672 and 1.631, 1.493 and 2.612, and 0.7804 and 1.047 mg/kg for Sargodha, Mianwali, and Bhakkar, respectively. The mean concentrations of chromium in blood plasma of goat which consumed the contaminated forages were between 0.666 and 1.269 mg/L in Sargodha, 0.657 and 0.752 mg/L in Mianwali, and 1.39 and 2.37 mg/L in Bhakkar. In blood plasma of sheep, the residual levels of chromium in the districts Sargodha, Mianwali, and Bhakkar were ranged from 0.673 to 1.384, 0.83 to 1.086, and 1.496 to 3.611 mg/L, respectively. In the present research, there was a higher concentration of chromium in blood plasma of sheep from Bhakkar and the lowest was in Sargodha. The chromium level in blood samples was found to be higher than the tolerable level of 1.0 mg/L in all districts. In light of these results, it was concluded that chromium levels in the soil and forages of all sites were present within the safe limit while in blood samples of sheep and goats were found to be above the acceptable limit. Sheep and goats also consume water from river, streams, and ponds and other contaminated water sources. So it might be the reason of higher level of chromium in their blood plasma. Hence, the proper monitoring of study sites will be necessary to prevent the excessive accumulation of chromium in ruminants in the near future.

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Section: Introductionmentioning

confidence: 99%

A study on the transfer of chromium from meadows to grazing livestock: an assessment of health risk

Khan

Ahmad

Siddique

et al. 2020

Environ Sci Pollut Res

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“…9 Since the early 90s, researchers have been embarking on research and development of thermochemical conversion processes that will play a critical role in alleviating the energy supply deciency. The novelty in these processes is that different material feedstocks, commonly coal, [10][11][12] including waste products such as waste tyres, [12][13][14] biomass; [15][16][17] plastics; [18][19][20] food waste; [21][22][23] microalgae; 24 and animal manure 25 etc. can be employed to yield high-end nal products.…”

Section: Introductionmentioning

confidence: 99%

“…MJ kg À1 ),65 food waste (3.667-9.920 MJ kg À1 ),66 animal manure (12-15 MJ kg À1 )25 and plastics (24-44 MJ kg À1 )67 as well as common fossil fuels such coal lignite (16.98 MJ kg À1 ) and subbituminous (33.04 MJ kg À1…”

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confidence: 99%

Developments in waste tyre thermochemical conversion processes: gasification, pyrolysis and liquefaction

et al. 2021

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“…Pyrolysis has become a general treatment method to deal with manure 8 , 9 . Pyrolysis operations can decrease the risk of environmental contamination 10 , 11 and the process decreases the risk of ash cohesion 12 and harmful discharges such as NO X , SO 2 , and particulates 13 , 14 . At the same time, pyrolysis operations allow the conversion of livestock manure into biochars 15 .…”

Section: Introductionmentioning

confidence: 99%

Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure

Wang

Zhang

Zeng

et al. 2021

Sci Rep

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This study was conducted to investigate the speciation, bioavailability and environmental risk of heavy metals (HMs) in chicken manure (CM) and water-washed swine manure (WSM) and their biochars produced at different pyrolysis temperatures (200 to 800 °C). As the pyrolysis temperature increased, the remaining proportion, toxicity characteristic leaching procedure (TCLP), HCl and diethylenetriamine pentaacetic acid (DTPA) of HMs gradually declined. This result proved that the speciation of HMs in chicken manure biochars (CMB) and water-washed swine manure biochars (WSMB) was influenced by pyrolysis temperature. The proportions of stable fractions were enhanced with increased pyrolysis temperature and weakened the HM validity for vegetation at 800 °C. Finally, the results of the risk assessment showed that the environmental risk of HMs in CMB and WSMB decreased with increasing pyrolysis temperature. Therefore, pyrolysis at 800 °C can provide a practical approach to lessen the initial and underlying heavy metal toxicity of CMB and WSMB to the environment.

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Evolution of heavy metals during thermal treatment of manure: A critical review and outlooks

Cited by 78 publications

References 120 publications

A study on the transfer of chromium from meadows to grazing livestock: an assessment of health risk

A study on the transfer of chromium from meadows to grazing livestock: an assessment of health risk

Developments in waste tyre thermochemical conversion processes: gasification, pyrolysis and liquefaction

Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure

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