Influence of the azo-dye amaranth on the trophic structure of activated sludge in a model experiment

Yotinov, Ivaylo; Belouhova, Mihaela; Todorova, Yovana; Schneider, Irina; Topalova, Yana

doi:10.1007/s11356-023-27406-2

Cited by 2 publications

(3 citation statements)

References 48 publications

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“…Firstly, changes in the dominant groups of Protozoa are directly related to changes in operating parameters in the reactors. Secondly, the biodiversity and abundance of taxa decrease along with decreasing the effectiveness of the treatment process [27,50]. The total amount of representatives per unit volume, the total number of taxa, the dominant key group of organisms and the number of small flagellates were investigated for determination of SBI.…”

Section: Effect Of the Applied Actions For Leachate Treatment Improve...mentioning

confidence: 99%

“…In this regard, one of the actions included in the algorithm is, in addition to the added biodegradable organic matter, a step-by-step adaptation of the activated sludge to the xenobiotics in the landfill leachate. These studies have been presented in other publications that evaluate in model conditions the degree of adaptation of activated sludges from different wastewater treatment plants to refractory organics and xenobiotics in landfill leachate [17,50,51,54].…”

Section: Effect Of the Applied Actions For Leachate Treatment Improve...mentioning

confidence: 99%

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Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

Schneider,

Yotinov,

Dinova

et al. 2023

Processes

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Landfill leachate is generated from waste degradation in landfill sites, and its treatment includes biological or combined treatment with physico-chemical methods. A frequently applied technology in the biological stage of landfill leachate treatment plants is based on denitrification and nitrification. Nevertheless, with the availability of a huge number of scientific reports, the management of denitrification and nitrification (D/N) processes in the frame of real wastewater treatment plants (WWTPs) is rather difficult and always remains a critical technological problem. This study aims to perform a comparative assessment between denitrification and nitrification processes during landfill leachate treatment in three different situations in the WWTP of the Municipal Enterprise for Waste Treatment in Sofia City, Bulgaria. The comparative assessment is based on the biotransformation effectiveness of ammonium ions in the course of nitrification and of nitrates in the course of denitrification. Mixed samples (wastewater and activated sludge) were taken from the sequencing batch reactors operating in the mode of denitrification and nitrification. All physico-chemical (pH, dissolved oxygen, organics concentration, BOD5:COD, nitrogen and phosphorous) and biological (sludge volume index, sludge biotic index, quantity of aerobic heterotrophs, denitrifiers and nitrifiers, total dehydrogenase activity) indicators were investigated in the samples from the biobasins in the mode of denitrification and nitrification. The conditions for the implementation of the two processes were compared, along with the state of the activated sludge in the different reactors. The obtained results showed that denitrification was the critical process in the technology on the base of D/N. A major factor that managed the denitrification was the lower concentration of biodegradable organic matter which led to a deformation of the activated sludge structure, a decrease in the count of heterotrophic microorganisms, a decrease in the total activity of the activated sludge and an inhibition of the nitrate reductase activity. The nitrification processes were accomplished with high intensity. The results confirmed that D/N could be optimized and controlled using specific wastewater treatment technology parameters and purposely applied indicators.

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Section: Effect Of the Applied Actions For Leachate Treatment Improve...mentioning

confidence: 99%

Section: Effect Of the Applied Actions For Leachate Treatment Improve...mentioning

confidence: 99%

Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

Schneider,

Yotinov,

Dinova

et al. 2023

Processes

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“…The used bacterial strain P. aureofaciens AP-9 belongs to one of the well-studied biodegradants-the genus Pseudomonas. Phenol biodegradation in lab conditions using pure or mixed cultures of pseudomonads has been studied in detail but there is still a need to model the processes of biological stimulation of biodegradation in conditions close to the complexity of real ecosystems [19,32]. This study aims to assess the effect of the P. aureofaciens AP-9 strain on key kinetic, microbiological, and enzymological parameters of simulated bioremediation processes for the removal of phenol.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Effect of Pseudomonas aureofaciens AP-9 on Bioremediation of Phenol-Contaminated River Sediments

Yotinov,

Kirilova,

Delcheva

et al. 2023

Processes

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One of the most widespread and risky pollutants in the environment is phenol. It is a by-product of many industrial, agricultural, and other anthropogenic activities. Microbial-assisted transformation, known as bioremediation, is an effective and cheap method for treating groundwater, soil, and sediments contaminated with phenol and its derivates. This study aims to assess the effect of the addition of a selected, pre-adapted bacterial strain Pseudomonas aureofaciens AP-9 on key kinetic, microbiological, and enzymological parameters of simulated bioremediation processes for the removal of phenol (250 mg/kg). The early effect of adding this microbial biodegradant in contaminated sediments is insignificant. The effect of added bacteria is manifested at the 48th hour by a restructuring of the microbial sediment communities and an increase in the number of cultivated microorganisms. This preparation of the sediment communities for a prolonged detoxification process is also confirmed by the repeated induction and very high increase in the activity of the enzymes directly involved in the cleavage of the benzene ring. The effectiveness of phenol removal at the 48th hour is increased by 15%, too. Considering this stimulation of a sustainable long-term bioremediation process, we can conclude that microbiological pre-adapted inoculants are an important mechanism for the management of bioremediation detoxification processes and can increase their effectiveness.

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Influence of the azo-dye amaranth on the trophic structure of activated sludge in a model experiment

Cited by 2 publications

References 48 publications

Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

Modeling of Effect of Pseudomonas aureofaciens AP-9 on Bioremediation of Phenol-Contaminated River Sediments

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