Laboratory-scale study of a biodegradable microplastic polylactic acid stabilizing aerobic granular sludge system

Song, Xin; Sun, Shuiyu; Gao, Yang; Zhang, Wei; Zhou, Lean; Jiang, Changbo; Wan, Junli; Chen, Jing; Zhou, Lu; Yu, Guanlong

doi:10.1016/j.envpol.2022.119329

Cited by 12 publications

(4 citation statements)

References 43 publications

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“…Overall, the sludge showed greater tolerance to the biodegradable PLA. This may be due to the sludge in the reactor degraded part of the PLA, making it a carbon source for microbial growth ( Song et al, 2022 ). However, when the concentration of PLA was increased to 100 mg/L, its degradation slowed down, resulting in a similar phenomenon as observed for the non-biodegradable PET at 50 mg/L.…”

Section: Resultsmentioning

confidence: 99%

The impacts of biodegradable and non-biodegradable microplastic on the performance and microbial community characterization of aerobic granular sludge

Guo,

Ma,

Niu

et al. 2024

Front. Microbiol.

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IntroductionMicroplastics (MPs), identified as emerging contaminants, have been detected across diverse environmental media. Their enduring presence and small size facilitate the adsorption of organic pollutants and heavy metals, leading to combined pollution effects. MPs also accumulate in the food chain thus pose risks to animals, plants, and human health, garnering significant scholarly attention in recent years. Aerobic granular sludge (AGS) technology emerges as an innovative approach to wastewater treatment. However, the impacts of MPs on the operational efficiency and microbial characteristics of AGS systems has been insufficiently explored.MethodsThis study investigated the effects of varying concentration (10, 50, and 100 mg/L) of biodegradable MPs (Polylactic Acid, PLA) and non-biodegradable MPs (Polyethylene Terephthalate, PET) on the properties of AGS and explored the underlying mechanisms.Results and discussionsIt was discovered that low and medium concentration of MPs (10 and 50 mg/L) showed no significant effects on COD removal by AGS, but high concentration (100 mg/L) of MPs markedly diminished the ability to remove COD of AGS, by blocking most of the nutrient transport channels of AGS. However, both PLA and PE promoted the nitrogen and phosphorus removal ability of AGS, and significantly increased the removal efficiency of total inorganic nitrogen (TIN) and total phosphorus (TP) at stages II and III (P < 0.05). High concentration of MPs inhibited the growth of sludge. PET noticeably deteriorate the sedimentation performance of AGS, while 50 mg/L PLA proved to be beneficial to sludge sedimentation at stage II. The addition of MPs promoted the abundance of Candidatus_Competibacter and Acinetobacter in AGS, thereby promoting the phosphorus removal capacity of AGS. Both 50 mg/L PET and 100 mg/L PLA caused large amount of white Thiothrix filamentous bacteria forming on the surface of AGS, leading to deterioration of the sludge settling performance and affecting the normal operation of the reactor. Comparing with PET, AGS proved to be more resistant to PLA, so more attention should be paid to the effect of non-biodegradable MPs on AGS in the future.

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Section: Resultsmentioning

confidence: 99%

The impacts of biodegradable and non-biodegradable microplastic on the performance and microbial community characterization of aerobic granular sludge

Guo,

Ma,

Niu

et al. 2024

Front. Microbiol.

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“…Their experimental results showed that when the PLA concentration was 5 mg/L, there was a slight decrease in the average COD removal rate during the initial stages. 25 When the retention time increased and the PLA concentration was increased to 40 mg/L, the COD removal rate exceeded 88%. Moreover, in the presence of PLA, the average removal rate of total phosphorus exceeded 90%.…”

Section: Effects Of Biodegradable Microplastics On Wastewater Treatme...mentioning

confidence: 99%

“…In addition, BMPs influenced the removal of organic matter and total phosphate during the wastewater treatment. Their experimental results showed that when the PLA concentration was 5 mg/L, there was a slight decrease in the average COD removal rate during the initial stages . When the retention time increased and the PLA concentration was increased to 40 mg/L, the COD removal rate exceeded 88%.…”

Section: Effects Of Biodegradable Microplastics On Wastewater and Slu...mentioning

confidence: 99%

“…Consequently, BMPs were demonstrated to significantly influence the performance of wastewater treatment and sludge disposal. Generally, BMPs tended to promote the heterotrophic nitrogen removal and sludge anaerobic fermentation processes. , Additionally, due to their special structure and properties, BMPs were reported to act as carriers of pollutants and significantly affect the structure and function of the microbial community in wastewater and sludge samples. , However, a comprehensive review of the fate and impact of BMPs in domestic wastewater and sludge environments has not been reported to date.…”

Section: Introductionmentioning

confidence: 99%

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Biodegradable Microplastics in Municipal Wastewater and Sludge Treatment Processes: A Review on Occurrence, Fate, and Effects

Lu,

Dong,

Zhou

et al. 2023

ACS EST Water

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Biodegradable plastics have emerged as reliable alternatives to conventional plastics for alleviating global plastic pollution. However, biodegradable plastics could also rupture into microplastics and inevitably accumulate in wastewater treatment plants (WWTPs). The fate and effects of biodegradable microplastics (BMPs) in wastewater treatment and sludge disposal processes are of great concern but have not yet been reviewed. This review comprehensively expounded the occurrence, fate, and consequential effects of BMPs in WWTPs. Specifically, the environmental contents of BMPs and the corresponding detection techniques were analyzed and compared with conventional microplastics. Furthermore, the mechanical aging, additive release, extracellular hydrolysis, and microbial biotransformation of BMPs were documented meticulously. Also, the effects of BMPs on microbial community structure and function, as well as pollutant adsorption, were underscored. The obtained knowledge would update our understanding of the risk and control of BMPs in WWTPs. Recommendations for future investigations are made.

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Fate and Transport of Emerging Pollutants in Aquatic Environment

Dawen,

Nabi

2024

Springer Water

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Laboratory-scale study of a biodegradable microplastic polylactic acid stabilizing aerobic granular sludge system

Cited by 12 publications

References 43 publications

The impacts of biodegradable and non-biodegradable microplastic on the performance and microbial community characterization of aerobic granular sludge

The impacts of biodegradable and non-biodegradable microplastic on the performance and microbial community characterization of aerobic granular sludge

Biodegradable Microplastics in Municipal Wastewater and Sludge Treatment Processes: A Review on Occurrence, Fate, and Effects

Fate and Transport of Emerging Pollutants in Aquatic Environment

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