Single and joint inhibitory effect of nitrophenols on activated sludge

Zhang, Zhuowei; Yu, Yin; Xi, Hailing; Zhou, Yuexi

doi:10.1016/j.jenvman.2021.112945

Cited by 15 publications

(3 citation statements)

References 66 publications

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“…In addition, a drastic drop in their content occurred immediately after the addition, indicating, as in the case of proteinaceous SMP and EPS, an intensive effect on cell synthesis (Figure 5b). Similar to our study, a sharp reduction in proteinaceous EPS was reported by Zhang et al [32] at high concentrations of nitrophenols-NP (>100 mg/L 2-NP, >50 mg/L 4-NP and >10 mg/L 2,4-DNP). Moreover, Fang et al [33] found a reduction in the content of SMP during the addition of the uncoupler of ortho-chlorophenol in an SBR, but not in that of EPS.…”

Section: Codinsupporting

confidence: 92%

Effect of the Oxidative Phosphorylation Uncoupler Para-Nitrophenol on the Activated Sludge Community Structure and Performance of a Submerged Membrane Bioreactor

Stavrakakis

Remmas

Melidis

et al. 2021

Water

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In this work, the metabolic uncoupler para-nitrophenol (pNP) was applied to suppress excess sludge production and to investigate its effects on the system’s performance and activated sludge community structure. The COD removal efficiency decreased from 99.0% to 89.5% prior to and after pNP addition, respectively. Application of pNP transiently reduced NH4+-N, NO3−-N and NO2−-N removal efficiencies, suggesting partial inhibition of both nitrifying and denitrifying activity. However, no changes in the relative abundance of the nitrifying bacteria occurred. Phosphorus removal efficiency was sharply reduced after pNP addition, as the consequence of hydrolysis of stored cell reserves. Tetrasphaera, a key polyphosphate accumulating organism, was also affected by the addition of pNP, a fact that highly influenced system’s ability to remove phosphorus. A drastic drop in Soluble Microbial Products (SMP) and Extracellular Polymeric Substances (EPS) was also detected shortly after the introduction of the uncoupler. On the other hand, MBR’s physicochemical parameters were restored to initial values a week after the addition of pNP. Moreover, remarkable changes in beta-diversity were noted after pNP addition. An increase of Bacteroidetes, Gammaproteobacteria and Firmicutes over Actinobacteria and Alphaproteobacteria was also observed after pNP addition.

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Section: Codinsupporting

confidence: 92%

Effect of the Oxidative Phosphorylation Uncoupler Para-Nitrophenol on the Activated Sludge Community Structure and Performance of a Submerged Membrane Bioreactor

Stavrakakis

Remmas

Melidis

et al. 2021

Water

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“…The contents of the total, LB-, and TB-EPS in the presence of phenol were higher than those in the absence of phenol. The increase of EPS excretion is beneficial in protecting microbes from toxic substrates (Zhang et al 2021b). In this study, the changing pattern of LB-EPS was similar to that of SMP in the two reactors.…”

Section: Content Variations Of Eps and Smpsupporting

confidence: 61%

Reduction of soluble microbial products in activated sludge system with pure oxygen aeration under toxic stress condition of phenol

2023

Global NEST: The International Journal

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<p>This study aimed to explore the effect of pure oxygen aeration on the generation of soluble microbial products (SMP) when activated sludge was under toxic stress condition of phenol. Two parallel sequencing batch reactors, one with air and the other with pure oxygen aeration, were used to investigate the relationships among effluent chemical oxygen demand (COD), N-acyl-homoserine lactones (AHLs), microbial community, extracellular polymeric substances (EPS), and SMP. The results showed that pure oxygen aeration caused rapid recovery of the activated sludge and low effluent COD concentration in steady condition when the two reactors were fed with phenol. In contrast, these results were not observed with sodium acetate as substrate. A strong correlation was found among C4-HSL, loosely bound EPS (LB-EPS), and SMP. The genera Zoogloea, Bacteroides, and Flavobacterium were also related to effluent COD, SMP, and LB-EPS production under toxic stress condition of phenol. Pure oxygen aeration reduced AHL production and decreased the relative abundance of specific genera (Zoogloea and Flavobacterium). These changes caused the reduction of SMP generation in the pure oxygen-aerated activated sludge systems. These results provide insights into the effect of pure oxygen aeration on SMP generation of activated sludge with toxic substance existence.</p>

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“…As an important raw and intermediate material for paints, plastics, rubber, pesticides, and photosensitive substances, nitrophenols are widely used in the petroleum and chemical industries. − However, nitrophenols are difficult to biodegrade and tend to bioaccumulate due to their conjugated benzene rings. Moreover, nitrophenols are highly toxic and harmful to human health, even at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of a Magnetic Glucose-Based Hyper-Cross-Linked Polymer by Dual-Role Ferric Chloride for Nitrophenol Removal from Sewage

Gao,

Wang,

et al. 2023

ACS EST Water

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Dual-purpose ferric chloride was successively used as a catalyst and iron source for ferric oxide to conveniently prepare a magnetic Fe3O4/HCPBn‑glu polymer with tetrabenzylglucose as the precursor. First, ferric chloride was employed as a Friedel–Crafts reaction catalyst for the synthesis of hyper-cross-linked HCPBn‑glu. Subsequently, the ferric chloride was utilized as an iron source for the synthesis of Fe3O4 magnetic nanoparticles by coprecipitation, which anchored Fe3O4 nanoparticles onto the HCPBn‑glu skeleton. A variety of modern analytical techniques were used to characterize prepared Fe3O4/HCPBn‑glu. The effects of adsorbent amount, contact time, and pH were studied, and this composite showed excellent adsorption performance for 2,4-dinitrophenol (DNP), with a maximum adsorption capacity of 83.3 mg/g and removal efficiency of 91.7%. The adsorption of DNP is well fitted by the Freundlich model, indicating multilayer adsorption. The adsorption kinetics obey a pseudo-second-order kinetic model. In addition, Fe3O4/HCPBn‑glu can be reused for at least six cycles with an acceptable removal efficiency, making it an economically valuable adsorbent. The adsorption mechanism was also discussed, and hydrogen bond, hydrophobic, and π–π interactions may be responsible for DNP adsorption. Based on these results, Fe3O4/HCPBn‑glu can be utilized as an effective adsorbent for the removal of nitrophenols from sewage.

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Single and joint inhibitory effect of nitrophenols on activated sludge

Cited by 15 publications

References 66 publications

Effect of the Oxidative Phosphorylation Uncoupler Para-Nitrophenol on the Activated Sludge Community Structure and Performance of a Submerged Membrane Bioreactor

Effect of the Oxidative Phosphorylation Uncoupler Para-Nitrophenol on the Activated Sludge Community Structure and Performance of a Submerged Membrane Bioreactor

Reduction of soluble microbial products in activated sludge system with pure oxygen aeration under toxic stress condition of phenol

Facile Synthesis of a Magnetic Glucose-Based Hyper-Cross-Linked Polymer by Dual-Role Ferric Chloride for Nitrophenol Removal from Sewage

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