Effect of diclofenac on the production of volatile fatty acids from anaerobic fermentation of waste activated sludge

Hu, Jiaxing; Zhao, Jianwei; Wang, Dongbo; Li, Xiaoming; Zhang, Dan; Xu, Qiuxiang; Peng, Lai; Yang, Qi; Zeng, Guangming

doi:10.1016/j.biortech.2018.01.059

Cited by 82 publications

(18 citation statements)

References 49 publications

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“…The low sensitivity of hydrogenotrophic methanogens to DCF, compared to other microbial groups is also supported by other works (Table 3) (Symsaris et al 2015;Hu et al 2018).…”

Section: Resultssupporting

confidence: 81%

“…These results are in good agreement with Fountoulakis et al (Fountoulakis et al 2004), who described 50% of inhibition of the acetoclastic methanogens with 120 mg/L of DCF and a mixture of acetate, casein and yeast extract (Table 3). However, inhibition of acetoclastic methanogenesis of 46% was obtained by Hu et al (Hu et al 2018), for 0.667 mg/L of DCF, with activated sludge from a secondary sedimentation tank of a municipal WWTP as inoculum, and acetate as substrate, revealing a higher susceptibility of that culture to DCF. A lower effect caused by DCF was obtained by Symsaris et al (Symsaris et al 2015), using acetate (Table 3).…”

Section: Resultsmentioning

confidence: 99%

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Ciprofloxacin, diclofenac, ibuprofen and 17α-ethinylestradiol differentially affect the activity of acetogens and methanogens in anaerobic communities

et al. 2020

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Pharmaceutical compounds end up in wastewater treatment plants but little is known on their effect towards the different microbial groups in anaerobic communities. In this work, the effect of the antibiotic Ciprofloxacin (CIP), the non-steroidal anti-inflammatory drugs Diclofenac (DCF) and Ibuprofen (IBP), and the hormone 17α-ethinylestradiol (EE2), on the activity of acetogens and methanogens in anaerobic communities, was investigated. Microbial communities were more affected by CIP, followed by EE2, DCF and IBP, but the response of the different microbial groups was dissimilar. For concentrations of 0.01 to 0.1 mg/L, the specific methanogenic activity was not affected. Acetogenic bacteria were sensitive to CIP concentrations above 1 mg/L, while DCF and EE2 toxicity was only detected for concentrations higher than 10 mg/L, and IBP had no effect in all concentrations tested. Acetoclastic methanogens showed higher sensitivity to the presence of these micropollutants, being affect by all the tested pharmaceutical compounds although at different degrees. Hydrogenotrophic methanogens were not affected by any concentration, indicating their lower sensitivity to these compounds when compared to acetoclasts and acetogens.

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“…The low sensitivity of hydrogenotrophic methanogens to DCF, compared to other microbial groups is also supported by other works (Table 3) (Symsaris et al 2015;Hu et al 2018).…”

Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Ciprofloxacin, diclofenac, ibuprofen and 17α-ethinylestradiol differentially affect the activity of acetogens and methanogens in anaerobic communities

et al. 2020

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“…Volatile fatty acids (VFAs) are valuable chemicals produced during the middle stages (acidogenesis and acetogenesis) of anaerobic digestion (AD) 1 . The interest in VFAs relies on their use as building blocks within the renewable-based biorefinery concept 2–4 .…”

Section: Introductionmentioning

confidence: 99%

Impact of Organic Loading Rate in Volatile Fatty Acids Production and Population Dynamics Using Microalgae Biomass as Substrate

Magdalena

Greses

González‐Fernández

2019

Sci Rep

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Volatile fatty acids (VFAs) are regarded as building blocks with a wide range of applications, including biofuel production. The traditional anaerobic digestion used for biogas production can be alternatively employed for VFAs production. The present study aimed at maximizing VFAs productions from Chlorella vulgaris through anaerobic digestion by assessing the effect of stepwise organic loading rates (OLR) increases (3, 6, 9, 12 and 15 g COD L−1 d−1). The biological system was proven to be robust as organic matter conversion efficiency into VFAs increased from 0.30 ± 0.02 COD-VFAs/CODin at 3 g COD L−1 d−1 to 0.37 ± 0.02 COD-VFAs/CODin at 12 g COD L−1d−1. Even though, the hydrolytic step was similar for all studied scenario sCOD/tCOD = 0.52–0.58), the highest OLR (15 g COD L−1 d−1) did not show any further increase in VFAs conversion (0.29 ± 0.01 COD-VFAs/CODin). This fact suggested acidogenesis inhibition at 15 g COD L−1d−1. Butyric (23–32%), acetic (19–26%) and propionic acids (11–17%) were the most abundant bioproducts. Population dynamics analysis revealed microbial specialization, with a high presence of Firmicutes followed by Bacteroidetes. In addition, this investigation showed the microbial adaptation of Euryarchaeota species at the highest OLR (15 g COD L−1d−1), evidencing one of the main challenges in VFAs production (out-competition of archaea community to avoid product consumption). Stepwise OLR increase can be regarded as a tool to promote VFAs productions. However, acidogenic inhibition was reported at the highest OLR instead of the traditional hydrolytic barriers. The operational conditions imposed together with the high VFAs and ammonium concentrations might have affected the system yields. The relative abundance of Firmicutes (74%) and Bacteroidetes (20%), as main phyla, together with the reduction of Euryarchaeota phylum (0.5%) were found the best combination to promote organic matter conversion into VFAs.

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“…Wastewater treatment plants (WWTPs) are extensively used for biological wastewater treatment to protect natural water bodies from pollution (Chen et al, 2016;Li et al, 2015;Wang et al, 2012a;2012b;. Despite their effective in environmental protection, they are often upset by excessive sludge production (Li et al, 2016;Hu et al, 2018;Wang et al, 2017b;2017c;2018a). For instance, it was reported that ~34 million metric tons of sludge (~20% of solids) were produced in China in 2015 (Feng et al, 2015;Xu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Free ammonia-based sludge treatment reduces sludge production in the wastewater treatment process

Yang

Wang

et al. 2018

Chemosphere

Self Cite

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Excessive sludge production is one of the major challenges for biological wastewater treatment plants. This paper reports a new strategy to enhance sludge reduction from the wastewater treatment process. In this strategy, 1/5 of the sludge is withdrawn from the mainstream reactor into a side-stream unit for sludge treatment with 16 mg/L free ammonia (FA) for 24-40 h. The FA-treated sludge mixture is then returned to the mainstream reactor. To demonstrate this concept, two reactors treating synthetic domestic wastewater were operated, with one serving as the experimental reactor and the other as the control. Experimental results showed that the experimental reactor exhibited 20% lower in sludge production than the control. FA treatment effectively disintegrated a portion of extracellular or intracellular substances of sludge cells in the FA treatment unit and lowered the observed sludge yields in the mainstream reactor, which were the main reasons for the sludge reduction. Although FA treatment decreased the activities of nitrifiers, denitrifiers, and polyphosphate accumulating organisms in the FA treatment unit, this strategy did not negatively affect the reactor performance and sludge properties of the experimental reactor such as sludge settleability, organic removal, nitrogen removal and phosphorus removal. Further investigation showed that the organics released from the FA treatment process could be used by PAOs and denitrifiers for carbon sources.

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Effect of diclofenac on the production of volatile fatty acids from anaerobic fermentation of waste activated sludge

Cited by 82 publications

References 49 publications

Ciprofloxacin, diclofenac, ibuprofen and 17α-ethinylestradiol differentially affect the activity of acetogens and methanogens in anaerobic communities

Ciprofloxacin, diclofenac, ibuprofen and 17α-ethinylestradiol differentially affect the activity of acetogens and methanogens in anaerobic communities

Impact of Organic Loading Rate in Volatile Fatty Acids Production and Population Dynamics Using Microalgae Biomass as Substrate

Free ammonia-based sludge treatment reduces sludge production in the wastewater treatment process

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