Evaluation of the rotational speed and carbon source on the biological removal of free cyanide present on gold mine wastewater, using a rotating biological contactor

Guadalima, Mónica Paola Guamán; Monteros, Diego Alejandro Nieto

doi:10.1016/j.jwpe.2018.03.008

Cited by 32 publications

(8 citation statements)

References 31 publications

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“…Unlike other bacteria, that require additional nutrients to be more efficient in the biodegradation process [87,88], this bacterium performed the biodegradation process at a pH adjusted to 10.5 so that the CN remained dissolved in the medium rather than transforming into HCN [89]. This parameter provides an advantage and is one of the most important factors during biodegradation treatment [30,90].…”

Section: Discussionmentioning

confidence: 99%

Cyanide Bioremediation by Bacillus subtilis under Alkaline Conditions

Cáceda Quiroz,

Fora Quispe,

Carpio Mamani

et al. 2023

Water

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Cyanide (CN) is a toxic environmental pollutant generated by various industrial activities, necessitating the application of bioremediation techniques for its degradation. Biodegradation is a more cost-effective and environmentally friendly technique with high efficiency in CN removal. This study isolated cyanide-degrading bacteria from Tutupaca mining site soil from Tacna, Peru. Bacillus subtilis strain TT10s was selected for its exceptional capacity to rapidly and completely eliminate cyanide under alkaline conditions (pH 10.5), removing 1000 ppm cyanide within 48 h. A kinetic analysis revealed that the biodegradation follows second-order rate kinetics (k2 = 0.08649 mg/(mg·h), R2 = 0.96622), consistent with the literature attribution of the rate-limiting step to the inducible cyanide dihydratase enzyme, which converts cyanide into ammonia and formate via the Michaelis–Menten model. Fourier-transform infrared spectroscopy (FTIR) spectral analysis further corroborated this enzymatic mechanism, showing the disappearance of CN peaks coupled with the emergence of ammonia (NH) and formate (C=O) peaks. Quantitative kinetic modelling integrated with FTIR profiles and degradation curves implicates cyanide dihydratase as the key rate-controlling enzyme in alkaline cyanide biodegradation without the need for an extra carbon source, generating interest for future bioremediation applications in highly contaminated environments.

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Section: Discussionmentioning

confidence: 99%

Cyanide Bioremediation by Bacillus subtilis under Alkaline Conditions

Cáceda Quiroz,

Fora Quispe,

Carpio Mamani

et al. 2023

Water

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“…Free cyanide is a very toxic compound and has an irreversible effect on for living beings and the environment. Therefore, Guadalima and Monteros (2018) assessed the effect of carbon source and rotational speed on the removal of free cyanide present in wastewater discharged from the gold mine, using an RBC. The results of the factorial analysis showed that free rotational speed ( ω ), cyanide concentration ([CN−] i ) and carbon source concentration ([FC] i ) were affected significantly ( P < 0·05) during the elimination of free cyanide.…”

Section: Rotating Biological Contactormentioning

confidence: 99%

A comprehensive review on application of bioreactor for industrial wastewater treatment

Meena

Yadav

Sonigra

et al. 2021

Letters Applied Microbiology

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In the recent past, wastewater treatment processes perform a pivotal role in accordance to maintain the sustainable environment and health of mankind at a proper hygiene level. It has proven as indispensable by government regulations throughout the world due to the importance of preserving freshwater bodies. Human activities, predominantly from industrial sectors, generate an immeasurable amount of industrial wastewater loaded with toxic chemicals, which not only cause dreadful environmental problems but also leave harmful impacts on public health. Hence, industrial wastewater effluent must be treated before releasing into the environment to restrain the problems related to industrial wastewater discharge to the environment. Nowadays, biological wastewater treatment methods have been considered as an excellent approach for industrial wastewater treatment process because of their cost-effectiveness in the treatment, high efficiency, and their potential to counteract the drawbacks of conventional wastewater treatment methods. Recently, the treatment of industrial effluent through bioreactor has proven as one of the best methods from the presently available methods. Reactors are the principle part of any biotechnology-based method for microbial or enzymatic biodegradation, biotransformation, and bioremediation. This review aims to explore and compile the assessment of the most appropriate reactors, like, packed bed reactor, membrane bioreactor, rotating biological contactor, up-flow anaerobic sludge blanket reactor, photobioreactor, biological fluidized bed reactor, continuous stirred tank bioreactor, etc. that are extensively used for distinct industrial wastewater treatment.

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“…The vast majority of studies that have been carried out on the treatment of free cyanide have been at the laboratory level and in steady-state systems, either suspended biomass systems or immobilized biomass systems, using different types of bacteria, such as Bacillus (B. cereus, among others [27,28], Pseudomonas (P. resinovorans [1], P. fluorencens [29], and P. pseudoalcaligenes [30], Alcaligenes [31], Rhodococcus sp. [32], Klebsiella pneumoniae [33] and Ralstonia sp.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of immobilized biomass systems, various types of packaging and operating conditions have been studied. The most commonly used packings are natural (granite rock, citrus peels, cellulose and gravel) and synthetic (stainless steel, geotextiles, alginate and plastics), which have shown effects on biomass concentrations in treatments varying from 1 × 10 6 -1 × 10 7 [28,36] or 3500 mg•L −1 to 10,000 mg•L −1 [37]. The retention time and agitation or flow rate depend on the configurations of the reactors and can range from 8 h [36] to 200 days [38], while pH can fluctuate between 6.5 and 10.5 units.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Factors for the Biological Treatment of Free and Complexed Cyanide

2023

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Mexico is characterized as a mining country since it is the world’s main silver producer. During its extraction, wastewater (mining tailings) is generated which contains cyanide and heavy metals. The purpose of this research was to determine whether a bacterial consortium isolated from a tailings dam can use cyanide as a source of nitrogen and carbon to carry out its biodegradation. The study determined the effects of three physicochemical factors (pH, temperature and inoculum concentration) and three metals (copper, iron and nickel) on cyanide biodegradation. The results showed that the highest cyanide removals were obtained when working with a pH of 9.5, a temperature of 25 °C and 15% v/v of inoculum (88%), while the optimum values for copper, iron and nickel were 0, 7.7 and 0.46 mg·L−1, respectively, showing that copper causes an inhibitory effect (cyanide biodegradation of 68%) on the bacteria and consequently on the biological degradation of cyanide and that iron can promote the biodegradation of the pollutant by 91%.

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Evaluation of the rotational speed and carbon source on the biological removal of free cyanide present on gold mine wastewater, using a rotating biological contactor

Cited by 32 publications

References 31 publications

Cyanide Bioremediation by Bacillus subtilis under Alkaline Conditions

Cyanide Bioremediation by Bacillus subtilis under Alkaline Conditions

A comprehensive review on application of bioreactor for industrial wastewater treatment

Optimization of Factors for the Biological Treatment of Free and Complexed Cyanide

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