Production of polyhydroxyalkanoates by activated sludge: Correlation with extracellular polymeric substances and characteristics of activated sludge

Li, Heng; Zhang, Jinfeng; Shen, Liang; Chen, Zheng; Zhang, Yanan; Zhang, Chuanpan; Li, Qingbiao; Wang, Qianqian

doi:10.1016/j.cej.2018.12.066

Cited by 50 publications

(8 citation statements)

References 27 publications

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“…[19][20][21][22][23] have been developed and applied so far for the treatment of industrial effluents and have shown various efficiencies for the degradation or removal of phenolic compounds [24]. Among the conventional methods for the treatment of industrial effluents, activated sludge (AS) has been widely adopted by various industries [25][26][27]. However, promoting its efficiency for the treatment of phenolic effluents is considered a field of interest among researchers and industries [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Enhanced biodegradation of phenolic wastewaters with acclimatized activated sludge – A kinetic study

Kamali

Gameiro

Costa

et al. 2019

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Enhanced biodegradation of phenolic wastewaters with acclimatized activated sludge – A kinetic study

Kamali

Gameiro

Costa

et al. 2019

Chemical Engineering Journal

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“…High concentrations of antibiotics can apply a high amount of pressure on microbial communities and allow for the emergence and dissemination of antibiotic resistance genes (ARGs) [1,51]. WWTPs have been found to be one of the major sources of ARGs being released into environment [52]. More specifically, tetracycline-resistant bacteria (TRB) and tetracycline-resistant genes (TRGs) have been frequently detected in activated sludge [53].…”

Section: Impact Of Doxycycline On the Bacterial Communities Of Activa...mentioning

confidence: 99%

Impact of Doxycycline Addition on Activated Sludge Microflora and Microbial Communities

Djelal,

Haddouche,

Lebreton

et al. 2024

Processes

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Municipal wastewater treatment plants (WWTPs) are exposed to high concentrations of micropollutants that can impact conventional activated sludge treatment. The consequences of this include failure to meet discharge standards and the disintegration of flocs, leading to poor sludge settleability. This lab-scale study focuses on the influence of doxycycline, an antibiotic widely used against human and animal diseases, on protozoa, metazoa, and bacterial communities under sludge growing conditions. Doxycycline was added to the mixed liquor of a communal WWTP up to 0, 100, 200, and 400 mg of doxycycline L−1 and incubated in batch conditions for 23 days. The regular addition of nutrient and carbon sources was preformed every 2 days to prevent sludge starvation. Sludge growth, conductivity, and settleability were measured and compared to sludge microbial community structure, determined by microscopic observations and high-throughput 16S rDNA sequencing. The high doxycycline concentration negatively impacted settleability and correlated with a decrease in bacterial diversity and floc disintegration. The addition of doxycycline promoted the enrichment of Proteobacteria Brevundimonas sp., Luteibacter anthropi, and the Bacteroidetes Chryseobacterium massoliae. These species are known to be resistant to a wide spectrum of antibiotics, including tetracyclines. A study of a larger scale may be conducted based on this study’ results.

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“…Bacterial PHA can be produced by bacteria or haloarchaea in absence of carbon and nutrient sources. They are thermoplastics having very high melting point and degradation temperature of 179 °C [3]. PHAs are ultraviolet (UV) stable bioplastics soluble in chloroform.…”

Section: Chemistry and Application Of Bioplasticsmentioning

confidence: 99%

“…Polyhydroxyalkanoates (PHA) are polyesters with thermoplastic properties largely known as biodegradable biopolymer. Among all the PHAs, polyhydroxybutyrate (PHB) and its copolymer polyhydroxyvalerate (PHV) combine together to form a biocompatible polymer (poly(3-hydroxybutyrate-co-3-hydroxyvalerate)) known as PHBV [3]. Microbes are capable of producing PHA in abundance of external carbon source (feast phase) and store them for future use in absence of food (famine phase) and further convert it into energy for metabolic activities [4].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Biodegradable Bioplastics from Different Activated Sludge Processes during Wastewater Treatment

Ghosh

2021

Degradation of Plastics

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To overcome the environmental hazards of petroleum based plastics, synthesis and use of microbial bioplastics became popular. Polyhydroxyalkanoates (PHAs) are biodegradable biopolymers having plastic like properties mainly used in tissue engineering and packaging. Bacteria can produce bioplastics in carbon abundance. Activated sludge process is a simultaneous process for treating wastewater and producing PHAs. Wastewaters are treated by using mixed sludge, aerobic granular sludge and chemically treated sludge which provided more than 40% PHA yield. This chapter describes the PHA structure, synthesis pathways, types of wastewaters and activated sludge processes used with reactor parameters and environmental factors effecting PHA productions.

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Production of polyhydroxyalkanoates by activated sludge: Correlation with extracellular polymeric substances and characteristics of activated sludge

Cited by 50 publications

References 27 publications

Enhanced biodegradation of phenolic wastewaters with acclimatized activated sludge – A kinetic study

Enhanced biodegradation of phenolic wastewaters with acclimatized activated sludge – A kinetic study

Impact of Doxycycline Addition on Activated Sludge Microflora and Microbial Communities

Recovery of Biodegradable Bioplastics from Different Activated Sludge Processes during Wastewater Treatment

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