Functional consortia for cresol-degrading activated sludges: Toxicity-to-extinction approach

Ho, Kuan-Hsien; Chen, Yu-You; Lee, Dong Hoon

doi:10.1016/j.biortech.2010.06.148

Cited by 24 publications

(6 citation statements)

References 38 publications

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“…Regarding the biodegradation of aromatic compounds, Comamonas, Pseudomonas, Stenotrophomonas, Burkholderia and Bradyrhizobium were the main heterotrophic genera detected and they have been described to be able to biodegrade several aromatic compounds, such as phenol, quinoline and cresols under aerobic conditions [27][28][29][30]. Therefore, the results of the pyrosequencing are consistent with the reactor performance and the main identified bacteria can be considered as the responsible microorganisms for biodegradation of phenol, ocresol and quinoline.…”

Section: Comamonas Nitrosomonas and Burkholderia Genera Belong To Besupporting

confidence: 63%

Biodegradation of a high-strength wastewater containing a mixture of ammonium, aromatic compounds and salts with simultaneous nitritation in an aerobic granular reactor

Ramos

Suárez-Ojeda

Carrera

2016

Process Biochemistry

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Long-term operation (390 days) of a continuous airlift reactor with aerobic granular biomass was successfully applied to treat a highly complex wastewater composed of: ammonium (1000 mg N L-1), o-cresol (100 mg L-1), phenol (100 mg L-1), quinoline (50 mg L-1) and salts (16 g salts L-1). High nitrogen loading rate (1.1 g N L-1 d-1) and organic loading rate of 0.7 (g COD L-1 d-1) were achieved for the simultaneous nitritation and complete biodegradation of the aromatic compounds. The successful operation of the granular airlift reactor can be related to (i) the growth of specialized microorganisms in the aerobic granules and (ii) the continuous feeding regime. Aerobic granules were maintained stable in spite of the high salinity conditions. Dissolved oxygen (DO) concentration and DO/ammonium concentrations ratio were the key parameters to select a suitable effluent for anammox or heterotrophic denitrification via nitrite. Besides, nitrous oxide emissions were related to the DO concentration in the reactor.

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Section: Comamonas Nitrosomonas and Burkholderia Genera Belong To Besupporting

confidence: 63%

Biodegradation of a high-strength wastewater containing a mixture of ammonium, aromatic compounds and salts with simultaneous nitritation in an aerobic granular reactor

Ramos

Suárez-Ojeda

Carrera

2016

Process Biochemistry

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“…Among them, the bacteria Pseudomonas sp. (Saravanan et al, 2008;Ho et al, 2010); Bacillus sp. (Tallur et al, 2006;Tallur et al, 2009;Ho et al, 2010); Serratia liquefaciens (Sharma et al, 2002); Serratia plymuthica (Pradhan and Ingle, 2007); Serratia marcescens (Singh et al, 2007); P. mirabilis (Mohite et al, 2011) were cited in the literature as efficient species in the mineralization of phenolic derivatives, including cresol.…”

Section: Microbiological Characterization Of Ssmentioning

confidence: 99%

Monitoring the natural attenuation of a sewage sludge toxicity using the Allium cepa test

Mazzeo

Fernandes

Levy

et al. 2015

Ecological Indicators

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Appropriate final disposal of sewage sludge (SS) generated by wastewater treatment plants (WWTP) has been considered a serious environmental problem, but also a viable alternative to be applied in agriculture, once SS is rich in organic matter and nutrients. However, SS can be a source of contamination of several toxic agents. Therefore, its use in agriculture requires special care to avoid possible damage to the environment and exposed organisms. Detoxification of toxic wastes can be performed using the monitored natural attenuation, which involves biological, physical and chemical processes that frequently occur in the environment. This study aimed to assess the feasibility of decontaminating SS after different periods of monitored natural attenuation. To this end, samples of SS and associations of soil/SS with proportions of 10, 25 and 50% SS were buried for 0, 2, 6 and 12 months in holes prepared in a place free of contamination. Allium cepa was used as an indicator to assess the efficiency of the natural attenuation process. According to chemical analysis, the SS samples presented a high concentration of m-and p-cresol, especially for samples analyzed after 0 or 2 months of natural attenuation. The microorganisms present in the SS belonged to 17 different genera of bacteria, which varied in the microbial composition among samples. Both, raw SS and aqueous SS extracts induced DNA damage in A. cepa, even when associated with soil. However, this effect was observed to decline during the attenuation period, although significant effects were detected for the highest tested concentration (100% SS) even at the end of this process. These results thus indicated the necessity of applying a stabilization process associating SS and soil for a period of at least 12 months and showed that the studied raw SS is not a viable material for use as a soil reconditioner, even after natural attenuation. A. cepa test proved to be a useful tool to assess the efficiency of SS detoxification process. Therefore, we suggest that the application of SS in agriculture should be approached with caution and that the SS must be previously submitted to methodologies that evaluate its toxic potential.

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“…Adav et al [13] applied an alternative approach, the concentration-to-extinction technique, to isolate the functional consortium, comprising Clostridium butyricum strain W4 and the Enterococcus saccharolyticus strain, from cattle manure for cellulose degradation and hydrogen production. Ho et al [14] utilized the toxicity-toextinction approach to obtain the minimally functional consortium that can effectively degrade meta-, para-, and ortho-cresols. The functional strains acquired under toxic stress by dosed cresols that individually degraded m-, p-, and o-cresols were identified.…”

Section: Introductionmentioning

confidence: 99%

Biohydrogen from cellulosic feedstock: Dilution-to-stimulation approach

Lee

et al. 2012

International Journal of Hydrogen Energy

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Functional consortia for cresol-degrading activated sludges: Toxicity-to-extinction approach

Cited by 24 publications

References 38 publications

Biodegradation of a high-strength wastewater containing a mixture of ammonium, aromatic compounds and salts with simultaneous nitritation in an aerobic granular reactor

Biodegradation of a high-strength wastewater containing a mixture of ammonium, aromatic compounds and salts with simultaneous nitritation in an aerobic granular reactor

Monitoring the natural attenuation of a sewage sludge toxicity using the Allium cepa test

Biohydrogen from cellulosic feedstock: Dilution-to-stimulation approach

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