Effects of PFOA on the physicochemical properties of anaerobic granular sludge: Performance evaluation, microbial community and metagenomic analysis

Cao, Linlin; Liao, Yongde; Chen, Su; Tang, Linqin; Qi, Zhifei; Wei, Lixin; Wu, Jinyan; Gao, Shu

doi:10.1016/j.jenvman.2022.114936

Cited by 21 publications

(7 citation statements)

References 55 publications

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“…55 Comparatively, 20 mg L −1 , PFOA did not impact the COD removal in an anaerobic granular system, however a concentration of 80 mg L −1 and 100 mg L −1 decreased the COD marginally. 50 For all systems, the presence of PFOS or PFOA prompted the microorganisms to produce abundant extracellular polymeric substances (EPS). EPS secretion is usually formed as a defensive mechanism when toxic compounds are present for the bacteria to reduce damage to their surfaces and during the process of "biolm" formation to maintain the structure of the granular sludge.…”

Section: Toxicological Effects Of Pfos and Pfoa On Microbial Communit...mentioning

confidence: 99%

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Impact of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) on secondary sludge microorganisms: removal, potential toxicity, and their implications on existing wastewater treatment regulations in Canada

Ilieva,

Hania,

Suehring

et al. 2023

Environ. Sci.: Processes Impacts

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Section: Toxicological Effects Of Pfos and Pfoa On Microbial Communit...mentioning

confidence: 99%

Section: Toxicological Effects Of Pfos and Pfoa On Microbial Communit...mentioning

confidence: 99%

Impact of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) on secondary sludge microorganisms: removal, potential toxicity, and their implications on existing wastewater treatment regulations in Canada

Ilieva,

Hania,

Suehring

et al. 2023

Environ. Sci.: Processes Impacts

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“…Cao et al (2022) showed that the average PFOA removal rate of anaerobic granular sludge was 52-55%, which was mainly caused by adsorption. However, it was found that PFOA could be degraded to C 7 F 15 by acid decarboxylation [22]. Shahasavari et al (2021) described the possible pathways of PFOA biodegradation [39].…”

Section: Process and Performance Of Pfoa Removal In Admentioning

confidence: 99%

“…Meanwhile, PFOA was found to inhibit transcription, amino acid transport, and metabolism of microorganisms [21]. In a 40-day semi-continuous experiment, the presence of PFOA significantly reduced the COD removal rate in the AD process [22]. Microbial community analysis showed that the diversity of microbial community decreased in the PFOA-containing groups, and the relative abundance of Proteobacteria decreased by 5.59%, thus reducing the ability of sludge to degrade organic matter.…”

Section: Introductionmentioning

confidence: 97%

Insight into the Impacts and Removal Pathways of Perfluorooctanoic Acid (PFOA) in Anaerobic Digestion

Xie

Chen

Wang

et al. 2022

Water

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Perfluorooctanoic acid (PFOA) that accumulates in wastewater and excess sludge interact with the anaerobes and deteriorate the energy recovery and pollutants removal performance in the anaerobic digestion (AD) system. However, the interaction between PFOA and microbial metabolism in the AD systems remains unclear. This study aimed to clarify the effects and mechanism of PFOA on the AD process as well as the removal pathways of PFOA in an AD system. The results showed that the methane recovery efficiency was inhibited by 7.6–19.7% with the increased PFOA concentration of 0.5–3.0 mg/L, and the specific methanogenesis activity (SMA) was inhibited by 8.6–22.3%. The electron transfer system (ETS) was inhibited by 22.1–37.3% in the PFOA-containing groups. However, extracellular polymeric substance (EPS) gradually increased due to the toxicity of PFOA, and the ratio of protein to polysaccharide shows an upward trend, which led to the formation of sludge aggregates and resistance to the toxic of PFOA. The PFOA mass balance analysis indicated that 64.2–71.6% of PFOA was removed in the AD system, and sludge adsorption was the main removal pathway, accounting for 36.1–61.2% of the removed PFOA. In addition, the anaerobes are proposed to have the potential to reduce PFOA through biochemical degradation since 10.4–28.2% of PFOA was missing in the AD system. This study provides a significant reference for the treatment of high-strength PFOA-containing wastes.

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“…By comparing the graphs for 2019 and 2021, it is easy to conclude that the economy and life started to recover in 2021, an aspect demonstrated by the 2021 limits’ variation of some important unicellular organisms (like: Amoeboids , Amphileptus , Paramecium spp., Zooflagelate ) that approaches to those for 2019. A comparative analysis regarding the species of microorganisms in activated sludge, identified in this study, and those reported in the literature [ 46 , 48 , 49 , 51 , 52 , 53 , 54 , 55 ] is also shown in Supplementary Table S1 .…”

Section: Discussionmentioning

confidence: 99%

Biological Activated Sludge from Wastewater Treatment Plant before and during the COVID-19 Pandemic

Roman

Sava

Iluțiu-Varvara

et al. 2022

IJERPH

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The COVID-19 pandemic and the related measures brought a change in daily life that affected the characteristics of the municipal wastewater and further, of the biological activated sludge. The activated sludge process is the most widely used biological wastewater treatment process in developed areas. In this paper, we aim to show the situation of specific investigations concerning the variation of the physicochemical parameters and biological composition of the activated sludge from one conventional wastewater treatment plant from a metropolitan area. The investigations were carried out for three years: 2019, 2020 and 2021. The results showed the most representative taxa of microorganisms: Microtrix, Aspidisca cicada, Vorticella convallaria, Ciliata free of the unknown and Epistylis and Rotifers. Even if other microorganisms were found in the sludge flocs, their small presence did not influence in any way the quality of the activated sludge and of the wastewater treatment process. That is why we conclude that protozoa (especially Flagellates and Ciliates) and rotifers were the most important. Together with the values and variation of the physicochemical parameters, they indicated a good, healthy, and stable activated sludge, along with an efficient purifying treatment process, no matter the loading conditions.

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Effects of PFOA on the physicochemical properties of anaerobic granular sludge: Performance evaluation, microbial community and metagenomic analysis

Cited by 21 publications

References 55 publications

Impact of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) on secondary sludge microorganisms: removal, potential toxicity, and their implications on existing wastewater treatment regulations in Canada

Impact of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) on secondary sludge microorganisms: removal, potential toxicity, and their implications on existing wastewater treatment regulations in Canada

Insight into the Impacts and Removal Pathways of Perfluorooctanoic Acid (PFOA) in Anaerobic Digestion

Biological Activated Sludge from Wastewater Treatment Plant before and during the COVID-19 Pandemic

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