Removal of organic micropollutants at PPB levels in laboratory activated sludge reactors under various operating conditions: biodegradation

Nyholm, Niels; Jacobsen, Bo Neergaard; Pedersen, B.; Poulsen, Ole; Damborg, Axel; Schultz, Birgit

doi:10.1016/0043-1354(92)90031-x

Cited by 50 publications

(27 citation statements)

References 18 publications

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“…In contrast, Blades-Fillmore (1980) observed neither first nor zero-order biodegradation kinetics but kinetics related to 2,4,6-TCP concentration for 2,4,6-TCP degradation by river water/sediment microbes at an initial concentration of 50 lg l )1 . Nyholm et al (1992) reported first order degradation kinetics of 20-1000 lg )1 2,4,6-TCP as a secondary carbon source. Dasappa and Loehr (1991) and Chang et al (1999) also reported first order kinetics, although the reaction order in first case seems closer to zero order, for 300-600 mg 2,4,6-TCP kg )1 in soil and its water soluble fraction.…”

Section: Discussionmentioning

confidence: 98%

Biodegradation kinetics of 2,4,6-Trichlorophenol by an acclimated mixed microbial culture under aerobic conditions

et al. 2006

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The objective of this study was to achieve a better quantitative understanding of the kinetics of 2,4,6-trichlorophenol (TCP) biodegradation by an acclimated mixed microbial culture. An aerobic mixed microbial culture, obtained from the aeration basin of the wastewater treatment plant, was acclimated in shake flasks utilizing various combinations of 2,4,6-TCP (25-100 mg l(-1)), phenol (300 mg l(-1)) and glycerol (2.5 mg l(-1)) as substrates. Complete primary TCP degradation and a corresponding stoichiometric release of chloride ion were observed by HPLC and IEC analytical techniques, respectively. The acclimated cultures were then used as an inoculum for bench scale experiments in a 4 l stirred-tank reactor (STR) with 2,4,6-TCP as the sole carbon/energy (C/E) source. The phenol acclimated mixed microbial culture consisted of primarily Gram positive and negative rods and was capable of degrading 2,4,6-TCP completely. None of the predicted intermediate compounds were detected by gas chromatography in the cell cytoplasm or supernatant. Based on the disappearance of 2,4,6-TCP, degradation was well modelled by zero-order kinetics which was also consistent with the observed oxygen consumption. Biodegradation rates were compared for four operating conditions including two different initial 2,4,6-TCP concentrations and two different initial biomass concentrations. While the specific rate constant was not dependent on the initial 2,4,6-TCP concentration, it did depend on the initial biomass concentration (X (init)). A lower biomass concentration gave a much higher zero-order specific degradation rate. This behaviour was attributed to a lower average biomass age or cell retention time (theta(x)) for these cultures. The implications of this investigation are important for determining and predicting the potential risks associated with TCP, its degradation in the natural environment or the engineering implications for ex situ treatment of contaminated ground water or soil.

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Section: Discussionmentioning

confidence: 98%

Biodegradation kinetics of 2,4,6-Trichlorophenol by an acclimated mixed microbial culture under aerobic conditions

et al. 2006

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“…The removals of such compounds at such low levels are a difficult problem. Physicochemical techniques such as coagulation, flocculation, ozonation, reverse osmosis and adsorption on activated carbon, manganese oxide, silicagel and clays are among the methods employed [7][8][9][10][11][12][13]. The biological processes typically accomplish very little towards color removal [14].…”

Section: Introductionmentioning

confidence: 99%

The adsorption kinetics of the cationic dye, methylene blue, onto clay

Gürses

Doğar

Yalçın

et al. 2006

Journal of Hazardous Materials

469

186

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“…Among these processes may be included coagulation, adsorption, precipitation, flocculation, ozonation (Stephenson and Sheldon, 1996;Churcley, 1998;Nyholm and al., 1992;Ogutveren and Kaparal, 1994;Coro and Laha, 2001; Kang and al., 2000). Of the numerous techniques mentioned, the adsorption process is one of the effective techniques that have been successfully employed for colour removal from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue From Aqueous Solution Using Ghassoul, a Low-Cost Adsorbent

Elass¹

2010

Appl Ecol Env Res

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Abstract. The present study examined the use of ghassoul, natural clay available in large quantities under the Atlas Mountains in Morocco, for the removal of the basic dye, methylene blue, from aqueous solutions. The effect of initial dye concentrations, agitation time, pH and temperature on adsorption capacities of methylene blue was investigated. The initial pH of the aqueous solution and the change of temperature (25-55 °C) were found to have little effect on the adsorption process. The adsorption was a rapid with 90-99% of the dye removed within the first 10-20 min. The adsorption kinetics are described successfully using a pseudo-second order rate equation and the rate constant decreases with increasing the initial concentration of MB. Experimental and calculated kinetic data for equilibrium are well expressed by Langmuir isotherm. The equilibrium adsorption capacity of ghassoul was determined with the Langmuir equation as well as the pseudo-second-order rate equation and found to be >290 mg dye per gram of the adsorbent. The results indicate that ghassoul could be employed as a low cost alternative to commercial activated carbon in wastewater treatment for the removal of colour and dyes.

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Removal of organic micropollutants at PPB levels in laboratory activated sludge reactors under various operating conditions: biodegradation

Cited by 50 publications

References 18 publications

Biodegradation kinetics of 2,4,6-Trichlorophenol by an acclimated mixed microbial culture under aerobic conditions

Biodegradation kinetics of 2,4,6-Trichlorophenol by an acclimated mixed microbial culture under aerobic conditions

The adsorption kinetics of the cationic dye, methylene blue, onto clay

Removal of Methylene Blue From Aqueous Solution Using Ghassoul, a Low-Cost Adsorbent

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