Metals removal from thermally treated tannery sludge: A novel approach

Juel, Ariful Islam; Hasan, Md. Anik; Mizan, Al; Hashem, Md. Abul

doi:10.1016/j.enmm.2021.100548

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Besides, the concern over chromium (Hossain et al 2021), (Juel, Hasan, and Hashem 2021), chlorides, sul des and TDS are the main pollutants in tannery e uents (Wibowo, Anggriyani, and Yuliatmo 2018), (Wu et al 2017). Due to harming the environment, researchers are trying to nd suitable alternative methods of salt preservation.…”

Section: Introductionmentioning

confidence: 99%

Low salt skin preservation with Gossypium hirstum seed-a cleaner approach

Mahmud,

Sarker,

Hossain

et al. 2023

Preprint

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Hides and skin preservation has been prominently undergoing salt curing technique for centuries which uses high amount of NaCl (40%) that causes huge amount of total dissolved solids (TDS) and salinity in soaking wastewater of leather processing. Recently, Phyto based preservation is getting emphasis due to being sustainable with less environmental impact. In this study, Gossypium hirstum (cotton) seed powder (5%-7.5%) with 10% salt were applied as a novel source for goatskin preservation. Curing efficiency was monitored by checking organoleptic property, physiochemical property (moisture content, shrinkage temperature, bacterial count, nitrogen content, etc.) at regular interval. Accomplishing the preservation period, preserved skins were processed into shoe upper leather. The pollution parameters were checked from soaking waste liquor to evaluate the environmental impact. SEM analysis and physical properties of the were evaluated to the quality of the produced shoe upper leather. The results revealed that newly developed preservative can preserve goatskin up to 28 days without any deterioration. Experiments reduced pollution by lowering chloride levels 65.33%-66.91%, total dissolved solids by 41.06%-35.2%, biochemical oxygen demand by 30.86%-34.28% percent, and chemical oxygen demand by 41.06%-35.2%. According to the correlation study, there were significant dependencies between the goatskin preservation efficacy parameters, with various strong correlation (r = − 0.976, p<0.001) found between shrinkage temperature and moisture content. Surface topography, physical strength of the produced leather was compatible to conventional shoe upper leather. Thus the introduced seed powder could be one of the valuable sources of eco-friendly leather preservation to reduce environmental pollution.

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Section: Introductionmentioning

confidence: 99%

Low salt skin preservation with Gossypium hirstum seed-a cleaner approach

Mahmud,

Sarker,

Hossain

et al. 2023

Preprint

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“…TS is composed of organic and inorganic compounds, including a high concentration of chromium (Cr) (Araujo et al, 2020), which brings environmental concerns regarding its application in the soil (Silva et al, 2010). For instance, the application of tannery sludge has increased soil salinity (Teixeira et al, 2006) and metal contamination (Juel et al, 2021). Therefore, recycling, and degrading TS methods have been recommended before it can be applied to soils.…”

Section: Introductionmentioning

confidence: 99%

Changes in the bacterial rare biosphere after permanent application of composted tannery sludge in a tropical soil

et al. 2023

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“…Various strategies are devised for tannery sludge management and disposal, such as its use in agriculture and landfilling 13 , 14 . Even if Cr(VI) salts are generally not used in tanning, and Cr in the fresh sludge is expected to persist in its trivalent state due to the high content of organic substances 15 , it is necessary to ensure that Cr(III) remains resistant to the conversion to the hexavalent form during disposal in oxidizing environments 16 , since Cr(VI) compounds are highly toxic and group one human carcinogens 17 .…”

Section: Introductionmentioning

confidence: 99%

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

Ghezzi,

Mugnaioli,

Perchiazzi

et al. 2023

Sci Rep

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Pyrolysis in an inert atmosphere is a widely applied route to convert tannery wastes into reusable materials. In the present study, the Cr(III) conversion into the toxic hexavalent form in the pyrolyzed tannery waste referred to as KEU was investigated. Ageing experiments and leaching tests demonstrated that the Cr(III)–Cr(VI) inter-conversion occurs in the presence of air at ambient temperature, enhanced by wet environmental conditions. Microstructural analysis revealed that the Cr-primary mineral assemblage formed during pyrolysis (Cr-bearing srebrodolskite and Cr-magnetite spinel) destabilized upon spray water cooling in the last stage of the process. In the evolution from the higher to the lower temperature mineralogy, Cr is incorporated into newly formed CrOOH flakes which likely react in air forming extractable Cr(VI) species. This property transforms KEU from an inert waste to a hazardous material when exposed to ordinary ambient conditions.

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Metals removal from thermally treated tannery sludge: A novel approach

Cited by 4 publications

References 28 publications

Low salt skin preservation with Gossypium hirstum seed-a cleaner approach

Low salt skin preservation with Gossypium hirstum seed-a cleaner approach

Changes in the bacterial rare biosphere after permanent application of composted tannery sludge in a tropical soil

Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge

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