p-Nitrophenol degradation by activated sludge attached on nonwovens

Bhatti, Zafar Iqbal; Toda, Haruko; Furukawa, Koichi

doi:10.1016/s0043-1354(01)00292-5

Cited by 169 publications

(82 citation statements)

References 15 publications

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“…Different strategies have been adopted in previous studies where a cosubstrate was used to boost biofilm growth. For example, the addition of glucose as a cosubstrate along with p-nitrophenol has been conducted to promote formation of the p-nitrophenol-degrading biofilm or granule for immobilization and also the added glucose was to ensure an adequate acclimation of the attached biofilms for p-nitrophenol degradation (Bhatti et al 2002;Yi et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Biodegradation of acetonitrile by adapted biofilm in a membrane-aerated biofilm reactor

Bai

Ohandja

et al. 2009

Biodegradation

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A membrane-aerated biofilm reactor (MABR) was developed to degrade acetonitrile (ACN) in aqueous solutions. The reactor was seeded with an adapted activated sludge consortium as the inoculum and operated under step increases in ACN loading rate through increasing ACN concentrations in the influent. Initially, the MABR started at a moderate selection pressure, with a hydraulic retention time of 16 h, a recirculation rate of 8 cm/s and a starting ACN concentration of 250 mg/l to boost the growth of the biofilm mass on the membrane and to avoid its loss by hydraulic washout. The step increase in the influent ACN concentration was implemented once ACN concentration in the effluent showed almost complete removal in each stage. The specific ACN degradation rate achieved the highest at the loading rate of 101.1 mg ACN/g-VSS h (VSS, volatile suspended solids) and then declined with the further increases in the influent ACN concentration, attributed to the substrate inhibition effect. The adapted membrane-aerated biofilm was capable of completely removing ACN at the removal capacity of up to 21.1 g ACN/m 2 day, and generated negligible amount of suspended sludge in the effluent. Batch incubation experiments also demonstrated that the ACN-degrading biofilm can degrade other organonitriles, such as acrylonitrile and benzonitrile as well. Denaturing gradient gel electrophoresis studies showed that the ACN-degrading biofilms contained a stable microbial population with a low diversity of sequence of community 16S rRNA gene fragments. Specific oxygen utilization rates were found to increase with the increases in the biofilm thickness, suggesting that the biofilm formation process can enhance the metabolic degradation efficiency towards ACN in the MABR. The study contributes to a better understanding in microbial adaptation in a MABR for biodegradation of ACN. It also highlights the potential benefits in using MABRs for biodegradation of organonitrile contaminants in industrial wastewater.

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Section: Discussionmentioning

confidence: 99%

Biodegradation of acetonitrile by adapted biofilm in a membrane-aerated biofilm reactor

Bai

Ohandja

et al. 2009

Biodegradation

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“…Yellow block crystals were obtained. Discussion para-Nitrophenol is a toxic compound that enters the environment during manufacturing and processing of a variety of industrial products, resulting in pollution of surface water, groundwater and soil [ 1,2]. On the other hand, in recent years, scientific and public awareness concerning the impact of the toxic heavy metal Pb on the natural environment has increased significantly, which is reflected in the wealth of recent literature concerning the health hazards posed by Pb to humans [3][4].…”

Section: Source Of Materialsmentioning

confidence: 99%

Crystal structure of catena-bis(μ-4-nitrophenolato)lead(II),Pb(C6H4NO3)2

Chen¹,

Xia²,

Zhu³

2004

Zeitschrift Für Kristallographie - New Crystal Structures

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“…p-Nitrophenol (PNP) is one of the major degradation product of the OP pesticides, which is considered as a priority pollutant by the Environmental Protection Agency (EPA) of USA (Munnecke and Hsieh 1976;Chaudhry et al 1988;Rani and Lalithakumari 1994). PNP concentrations in natural waters generally are less than 10 mg l -1 (Kulkarni and Chaudhari 2006;Zhang et al 2009), and its fate in the environment has been studied extensively (Bhatti et al 2002;Singh and Walker 2006). Mineralization of PNP by microorganisms have been reported previously (Spain and Gibson 1991;Bhushan et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of methyl parathion and p-nitrophenol by a newly isolated Agrobacterium sp. strain Yw12

2011

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Strain Yw12, isolated from activated sludge, could completely degrade and utilize methyl parathion as the sole carbon, phosphorus and energy sources for growth in the basic salt media. It could also completely degrade and utilize p-nitrophenol as the sole carbon and energy sources for growth in the minimal salt media. Phenotypic features, physiological and biochemical characteristics, and phylogenetic analysis of 16S rRNA sequence showed that this strain belongs to the genus of Agrobacterium sp. Response surface methodology was used to optimize degradation conditions. Under its optimal degradation conditions, 50 mg l(-1) MP was completely degraded within 2 h by strain Yw12 and the degradation product PNP was also completely degraded within 6 h. Furthermore, strain Yw12 could also degrade phoxim, methamidophos, chlorpyrifos, carbofuran, deltamethrin and atrazine when provided as the sole carbon and energy sources. Enzymatic analysis revealed that the MP degrading enzyme of strain Yw12 is an intracellular enzyme and is expressed constitutively. These results indicated that strain Yw12 might be used as a potential and effective organophosphate pesticides degrader for bioremediation of contaminated sites.

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p-Nitrophenol degradation by activated sludge attached on nonwovens

Cited by 169 publications

References 15 publications

Biodegradation of acetonitrile by adapted biofilm in a membrane-aerated biofilm reactor

Biodegradation of acetonitrile by adapted biofilm in a membrane-aerated biofilm reactor

Crystal structure of catena-bis(μ-4-nitrophenolato)lead(II),Pb(C6H4NO3)2

Biodegradation of methyl parathion and p-nitrophenol by a newly isolated Agrobacterium sp. strain Yw12

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