Anaerobic co-digestion of tannery waste water and tannery solid waste using two-stage anaerobic sequencing batch reactor: focus on performances of methanogenic step

Berhe, Shifare; Leta, Seyoum

doi:10.1007/s10163-018-0706-9

Cited by 21 publications

(9 citation statements)

References 36 publications

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“…Except for batch 5 (485 mg/L, end July 2018), the TOC (820-9080 mg/L, Table 1) in this study were higher than 510 mg/L reported by Bhattacharya et al [13]. Although, the optimal C:N range for AD is 20-30 [14], the optimal range for TWW has been reported as 6-9 [15]. Anaerobic reactors operating at lower than optimal C:N ratios are likely to suffer NH 3 and VOA inhibition during AD.…”

Section: Concentration Of Nitrogen Carbon and Volatile Organic Acids In The Ostrich Tannery Effluentcontrasting

confidence: 58%

“…Interestingly, Mpofu et al [6] The %COD reduction achieved in this study were lower compared to other studies using ASBR and other continuous reactors (UASB, UAFFB, UAFBR, SAnMBR, and UACF) [7]. They were however in the same range with 45%, 56%, 45%, and 43%, accomplished by Achour et al [28], Berhe et al [15], Daryapurkar et al [40], and Saxena et al [27] respectively, using batch reactors.…”

Section: Optimisation Of Cumulative Methane Yield and Anaerobic Biodegradabilitycontrasting

confidence: 43%

“…The VOA:ALK ratios of OTE (0.53-0.62) were >0.4, indicated the possibility of AD process instability and failure [18]. However, the speciation of NH 3 − NH 4 during the AD of nitrogenous wastes serves as a buffer and plays a vital role in maintaining a relatively constant pH [15,19].…”

Section: Concentration Of Nitrogen Carbon and Volatile Organic Acids In The Ostrich Tannery Effluentmentioning

confidence: 99%

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Anaerobic Co-Digestion of Tannery and Slaughterhouse Wastewater for Solids Reduction and Resource Recovery: Effect of Sulfate Concentration and Inoculum to Substrate Ratio

et al. 2021

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Anaerobic digestion is considered unsuitable for the bioremediation of tannery effluent due to process inhibition, mainly due to high concentrations of sulfur species, and the accumulation of H2S and/or NH3. This study using the standardized biochemical methane potential protocol showed that efficient processing is possible with slaughterhouse wastewater, provided sufficient functional biomass is present at the start of the process and the SO42− concentration is below inhibition threshold. Methanogenic activity (K = 13.4–17.5 and µm = 0.15–0.27) and CH4 yields were high when reactors were operated ISR ≥ 3 and/or lower SO42− ≤ 710 mg/L while high SO42− ≥ 1960 mg/L and ISR < 3.0 caused almost complete inhibition regardless of corresponding ISR and SO42−. The theoretical optimum operating conditions (922 mg/L SO42−, ISR = 3.72) are expected to generate 361 mL biogas/gVS, 235 mL CH4/gVS with reduction efficiencies of 27.5% VS, 27.4% TS, 75.1% TOC, 75.6% SO42−, and 41.1% COD. This implies that tannery sludge will be reduced by about 27% (dry mass) and SO42− by 76%, with a fraction of it recovered as S0. The models displayed a perfect fit to the cumulative CH4 yields with high precision in the order Logistic > Cone > modified Gompertz > first order.

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Section: Concentration Of Nitrogen Carbon and Volatile Organic Acids In The Ostrich Tannery Effluentcontrasting

confidence: 58%

Section: Optimisation Of Cumulative Methane Yield and Anaerobic Biodegradabilitycontrasting

confidence: 43%

Section: Concentration Of Nitrogen Carbon and Volatile Organic Acids In The Ostrich Tannery Effluentmentioning

confidence: 99%

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Anaerobic Co-Digestion of Tannery and Slaughterhouse Wastewater for Solids Reduction and Resource Recovery: Effect of Sulfate Concentration and Inoculum to Substrate Ratio

et al. 2021

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“…No studies covering the anaerobic digestion of chromium leather waste in continuous trials could be found for comparison. Some authors studied the digestion of tannery waste in continuous or semi‐continuous mode but the material was always collected from tanneries prior to the tanning step and this is known to be already in use industrially . These studies mainly used fleshings as substrate, which are also not suitable for comparison due to a high fat content.…”

Section: Resultsmentioning

confidence: 99%

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Gomes

Repke

Meyer

2019

Engineering in Life Sciences

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During leather manufacture, high amounts of chromium shavings, wet by‐products of the leather industry, are produced worldwide. They are stable towards temperatures of up to 110°C and enzymatic degradation, preventing anaerobic digestion in a biogas plant. Hitherto, chromium shavings are not utilized industrially to produce biogas. In order to ease enzymatic degradation, necessary to produce biogas, a previous denaturation of the native structure has to be carried out. In our projects, chromium shavings were pre‐treated thermally and mechanically by extrusion and hydrothermal methods. In previous works, we intensively studied the use of these shavings to produce biogas in batch scale and significant improvement was reached when using pre‐treated shavings. In this work, a scale‐up of the process was performed in a continuous reactor using pre‐treated and untreated chromium shavings to examine the feasibility of the considered method. Measuring different parameters along the anaerobic digestion, namely organic matter, collagen content, and volatile fatty acids content, it was possible to show that a higher methane production can be reached and a higher loading rate can be used when feeding the reactor with pre‐treated shavings instead of untreated chromium shavings, which means a more economical and efficient process in an industrial scenario.

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“…Generally very aggressive methods are used [1] such as co-digestion [13], pyrolysis [6,14], incineration to inert the chromium [15], steam gasification [16], biogas production [17] or biodiesel [18] chromium acid extraction to formulate fertilizers [19]. Such methods have a major economic impact so that only exceptional proposed strategies can be made operational.…”

Section: Introductionmentioning

confidence: 99%

Selection of Tanned-Leather Waste in Recovering Novel Raw Material for Manufacturing Rubber Artifacts: Towards a Zero-Waste Condition

2020

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Zero-waste is an ambitious goal to encourage sustainable production, consumption optimum recycling and resource recovery. The recycling and resource recovery of chrome-tanned leather waste is a difficult proposition because of the three-dimensional chemical network of collagen, which renders leather waste incompatible to polymer matrices. Many attempts have been undertaken to reuse leather waste, most of them require technological processes and challenging chemical pretreatments, which make the reuse an economically disadvantageous industrial operation. The paper aims to show how a very fine separation of leather solid waste leads to raw materials suitable for mixtures with natural rubber, without any chemical pretreatment. In other words, the paper intends to be a stimulus to manage leather solid waste carefully to start a cleaner and more profitable production. In particular, various industrial compounds containing different concentrations of post-tanning dyeing, or chrome shaving or oil-tanning and natural rubber were vulcanized through a standard preparation. Some compounds were also reinforced with carbon black and the vulcanization kinetics were monitored through rheometer. Experimental results indicate that there exists an optimal concentration of waste such that post-tanning dyeing post-tanning and chrome shaving are suitable for manufacture floor mats, soles and heels while oil-tanning waste can be used for making hose or conveyor belts. The mechanical performances of the articles prepared by direct mixing with leather waste are the same as those of commercially distributed rubber products.

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Anaerobic co-digestion of tannery waste water and tannery solid waste using two-stage anaerobic sequencing batch reactor: focus on performances of methanogenic step

Cited by 21 publications

References 36 publications

Anaerobic Co-Digestion of Tannery and Slaughterhouse Wastewater for Solids Reduction and Resource Recovery: Effect of Sulfate Concentration and Inoculum to Substrate Ratio

Anaerobic Co-Digestion of Tannery and Slaughterhouse Wastewater for Solids Reduction and Resource Recovery: Effect of Sulfate Concentration and Inoculum to Substrate Ratio

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Selection of Tanned-Leather Waste in Recovering Novel Raw Material for Manufacturing Rubber Artifacts: Towards a Zero-Waste Condition

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