Removal of sulfides from tannery-sourced wastewaters

Bykovsky, N. A.; Кантор, Е. А.; Rahman, P A; Puchkova, L. N.; Fanakova, N. N.

doi:10.1088/1755-1315/350/1/012030

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…Liquid wastes pose significant challenges, both in terms of volume-with 50,000 L required to produce just 1 kg of leather [37], and composition, laden with heavy metals [38], sulfides [39] and organic matter. The tanning stage introduces tanning liquors, the composition of which varies with the tanning technique and includes substances such as tannins and chromium salts [40].…”

Section: Solid Waste Tannery Residuesmentioning

confidence: 99%

“…Tannins: These residues can be of vegetable or synthetic origin, used in the tanning process [51,52]. Sulfides: Sulfides are used in the dehairing process and can be harmful if released into the environment [39,53] Gaseous Emissions…”

Section: Chemical Wastesmentioning

confidence: 99%

“…nins: These residues can be of vegetable or synthetic origin, used in the tanning process [51,52]. ides: Sulfides are used in the dehairing process and can be harmful if released into the environment [39,53] tile Organic Compounds (VOCs): VOCs are emitted during drying, finishing, and thermal processes [54,55]. rogen Sulfide and Ammonia: Substances released during beam house operations (such as soaking, liming, and airing) [54,55].…”

Section: Eer Review 7 Ofmentioning

confidence: 99%

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Exploring Tannery Solid Wastes as a Source of Animal Feed

Flores Tapia,

Brito Moina

2023

Processes

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This review delves into the processing of tannery solid waste, emphasizing fleshings and chromium-tanned leather waste. This paper centers on fat recovery, chromium elimination, and protein preservation, aiming to make them apt for animal consumption. This paper also assesses the potential of introducing such recycled products to the global market. Drawing on the literature from the past two decades, sourced comprehensively from Scopus and Web of Science, 36 articles were selected because of their significant contributions from leather production powerhouses such as India and Brazil. Fleshings have shown immense potential as animal feed, and the extraction of tallow and collagen from rawhide trimmings yields up to 98% and 93%, respectively. Fermented tannery fleshings, notably with Enterococcus faecium HAB01, also demonstrate strong antioxidant capabilities. The overarching consensus emphasizes the need for rigorous purification when dealing with chromium-containing wastes, addressing concerns tied to Cr (III) and Cr (VI). Furthermore, raw tannery fleshings stand out as a sustainable, cost-effective, and globally marketable solution for animal feed production.

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Section: Solid Waste Tannery Residuesmentioning

confidence: 99%

Section: Chemical Wastesmentioning

confidence: 99%

Section: Eer Review 7 Ofmentioning

confidence: 99%

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Exploring Tannery Solid Wastes as a Source of Animal Feed

Flores Tapia,

Brito Moina

2023

Processes

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“…The traditional methods and techniques employed for EDA detection include bioindicator testing, 2 fluorescent probe, 3 and chromatographic method 4 . However, these methods require expensive instrumentation, cumbersome operational techniques, and long operation time.…”

Section: Introductionmentioning

confidence: 99%

Sensor performance and computational study of polyaniline film in ethylenediamine detection

Khor,

Tan,

Kerk

et al. 2023

Polymer Engineering & Sci

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The incorporation of computational chemistry toward the assessment of polyaniline (PAni) performance as ethylenediamine (EDA) sensor is first explored in this study. Through chemical oxidative polymerization, PAni is synthesized at different temperatures and applied as chemical sensor for EDA detection. PAni(0°C) exhibits higher electrical conductivity (1.486 × 10−2S/cm) and better sensitivity (0.0529) with R2 of 0.8419 compared to PAni(25°C). The presence of branches in PAni(25°C) hinders EDA from approaching the reactive sites of PAni and hence resulted in low sensitivity of 0.0022. Besides, 0.5 ppm limit of detection was obtained by using 3 layers of PAni(0°C). PAni(0°C) showed good recyclability of up to 10 cycles with 7 s short response time and 5 s fast recovery time. Meanwhile, good recoveries of 110% and 95% were obtained for real sample analysis for PAni(0°C). The high electrical conductivity of PAni(0°C) is supported by its low band gap energy of −0.2803 eV that was obtained by computational data. Based on the computational data, PAni(0°C) possesses the highest sensitivity in EDA detection with the short response time of 7 s which shows good agreement with the high interaction energy of 294 kcal/mol. Thus, a simple and effective EDA sensor is successfully developed.Highlights PAni(0°C & 25°C) were successfully characterized by FTIR and UV–Vis analysis. PAni(0°C) shows higher conductivity due to formation of longer polymer chain. Higher sensitivity toward EDA (slope = 0.0529) is obtained for PAni(0°C). PAni(0°C) tetramer shows higher interaction energy and lower band gap energy. PAni(0°C) shows 7 s response time, 5 s recovery time, and up to 10 recycling cycle.

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Reducing the pollution load of tannery wastewater and the atmospheric emission of hydrogen sulfide using modified tannin

Uez

Hansen

Osório

et al. 2023

Water Science and Technology

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Industrial wastewater causes several environmental and health issues due to its composition, and hydrogen sulfide is one of the main contaminants from various industrial activities, including tannery wastewater treatment plants. This study aimed to evaluate the application of a modified tannin to remove hydrogen sulfide, chemical oxygen demand, total nitrogen, color, and turbidity from tannery wastewater and to reduce the atmospheric emission of sulfides. The wastewater was treated using modified tannin, aluminum sulfate, and a combination of both. Gaseous sulfide emissions were analyzed qualitatively using paper soaked in lead acetate. The qualitative methodology of hydrogen sulfide in the atmosphere was efficient to identify the most critical areas in the tannery. The wastewater treatment tests showed that the best option was the combination of both coagulants, in a 50:50 ratio, resulting in a total coagulant dosage of 3,000 mg/L. The removal efficiencies achieved were 13.8% sulfides, 23.3% chemical oxygen demand, 9.1% total nitrogen, 97.3% turbidity, and 96.4% color. This treatment technique promotes the replacement of 50% of the aluminum sulfate currently used in the tannery by a non-toxic coagulant and does not require chemicals to adjust the pH of the wastewater.

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Removal of sulfides from tannery-sourced wastewaters

Cited by 3 publications

References 2 publications

Exploring Tannery Solid Wastes as a Source of Animal Feed

Exploring Tannery Solid Wastes as a Source of Animal Feed

Sensor performance and computational study of polyaniline film in ethylenediamine detection

Reducing the pollution load of tannery wastewater and the atmospheric emission of hydrogen sulfide using modified tannin

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