Mathematical modelling of 4-chlorophenol inhibition on COD and 4-chlorophenol removals in an activated sludge unit

Konya, Isil; Eker, Serkan; Kargı, Fikret

doi:10.1016/j.jhazmat.2006.09.015

Cited by 12 publications

(14 citation statements)

References 34 publications

(44 reference statements)

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“…The CPs are highly toxic and usually exhibit substrate inhibition (Kargi et al, 2005;Chen and Lin, 2006;Konya et al, 2007), although the concentration at which the compound starts to inhibit depends strongly on the strain and the acclimation procedure (Moreno- Andrade and Buitrón, 2004;Sahinkaya and Dilek, 2005). For the culture used in this work, under the conditions described above, the onset of inhibition in PCP degradation was observed from 40 to50 mg•ℓ -1 of PCP (data not shown) and the degradation did not take place at initial concentrations above 150 mg•ℓ -1…”

Section: Resultsmentioning

confidence: 99%

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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This work was undertaken to investigate the effect of variations of the feed rate on a fed-batch set-up used to degrade xenobiotics. The mixture of substrates was composed of PCP, 2,4,6 TCP and 2,3,5,6 TeCP (pentachlorophenol, 2,4,6 trichlorophenol and 2,3,5,6 tetrachlorophenol respectively). Two acclimated bacteria isolated from soil were used: Pseudomonas aeruginosa and Achromobacter sp. nov. The different flow rates tested were: I: 0.5 mℓ•min . Our results show that during fed-batch operation the 2,4,6 TCP exhibits an earlier degradation than the other compounds, for all of the flow rates tested. This indicates that in this case the degradation of the most recalcitrant compounds (PCP and 2,3,5,6 TeCP) is benefited by the increase in biomass of bacteria, due to the metabolisation of a less recalcitrant compound (2,4,6 TCP). The defined parameter, specific degradation rate (SDR), was demonstrated to be very useful for comparing the degradation abilities at different flow rates of a fed-batch system. The degradation efficiencies were shown to be higher than 90% for all of the cases and to decrease as the feed rate increases. However, the SDR, a parameter that involves the rate of degradation and the biomass, increases as the flow rate increases. At a feed flow rate of 2 mℓ•min -1 SDR reaches a maximum of 12.476 x 10 -10 mgCP•h -1•CFU -1. Finally, among the feed flows tested, taking into account both the degradation efficiency and the SDR, 2 mℓ•min -1 is the most convenient flow rate for chlorophenol degradation in fed-batch systems. An even higher degradation efficiency (97%) can be achieved by using the feed rate of 2 mℓ•min -1 followed by an additional batch post-treatment of 2 h, with a SDR of 13.136 x 10 -10 mg CP•h -1•CFU -1.

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Section: Resultsmentioning

confidence: 99%

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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“…The nitrogen deficiency was fulfilled by adding an equivalent amount of urea to the effluent to be treated at the startup of Set 2 and Set 3 experiments. The parameters, like COD, DO, MLSS, pH, TOC, TN, TP, agitation speeds, etc., were also noted [1,7,8].…”

Section: Methodsmentioning

confidence: 92%

“…As the chemical treatments have comparatively high cost and may require additional treatment for neutralizing the effect of added chemicals, the biological treatments have become more acceptable. In order to have effective removal of organic compounds from wastewaters, aerobic wastewater treatment methods have proved to be excellent due to easy handling of huge amount of effluents, less cost, abundant organisms availability, effective coagulation for removing the nonsettleable colloidal solids, simplicity of designing and treatment to a high degree of reduction to meet the pollution limits [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies on agrochemicals wastewater treatment by aerobic activated sludge process at high MLSS and high speed agitation

Karkare

Murthy

2012

Journal of Industrial and Engineering Chemistry

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“…Different methods were developed for biological treatment of wastewater containing complex organic compounds (Maeda et al, 2005;Ning et al, 2005;Konya et al, 2007;Mathur and Majumder, 2007;Ozbelge et al, 2007;Pamukoglu and Kargi, 2007;Chau et al, 2006;Li et al, 2008;Contreras et al, 2008;Oroeo et al, 2008). The objectives of such biological treatments are removal of colloidal and dissolved carbonaceous organic matter present in wastewater and are relatively inexpensive as compared to physical and chemical methods (Ning et al, 2005;Yan et al, 2005;Alaton et al, 2004;Faria et al, 2005;Chikh et al, 2004;Lee et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Attempts have also been made to generate mathematical models for activated sludge units treating chlorophenol in order to attain kinetics and stoichiometric constants relating to chemical oxygen demand (COD) using continuous study (Konya et al, 2007;Pamukoglu and Kargi, 2007;Contreras et al, 2008;Oroeo et al, 2008;Nakhla et al, 2006). Modified kinetic equation particularly incorporates the effect of initial COD of the system, in addition to the effect of dissolved oxygen (DO) and mixed liquor suspended solids (MLSS) of the system on the substrate consumption rate (Deshmukh et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study and Modeling of Aerobic Biological Oxidation of Organic Wastewater

Karkare¹,

Murthy²

2010

Chemical Product and Process Modeling

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The complex organic wastewater from agrochemical industry consists of a large number of solids and dissolved compounds. For the design and scale-up of any activated sludge reactor, it is desirable to know the kinetics of oxidation, which strongly depends upon the nature of wastewater and the microorganism. In the present work, the kinetics of aerobic biological oxidation of an agrochemical plant waste is investigated, having initial COD of 800-1200 mg/L. Experiments are performed at five different dissolved oxygen (DO) levels; viz. (i) 1.5 to 2.5 mg/L, (ii) 2.5 to 3.5 mg/L, (iii) 3.5 to 4.5 mg/L, (iv) 4.5 to 5.5 mg/L, and (v) 5.5 to 6.5 mg/L. For each DO level five mixed liquor suspended solids (MLSS) are studied in the range of 6000-20000 mg/L. The maximum percentage reduction of COD is 74.1%, 74.8%, 89.9%, 73.3% and 89.6% at different DO levels of 1.5-2.5 mg/L, 2.5 to 3.5 mg/L, 3.5 to 4.5 mg/L, 4.5 to 5.5 mg/L, and 5.5 to 6.5 mg/L and MLSS concentrations from 6000 to 20000 mg/L, respectively. An attempt is made to propose the kinetics of substrate utilization that does not actively support growth of organism. A kinetic model is proposed to understand the effect of DO and MLSS concentration.

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Mathematical modelling of 4-chlorophenol inhibition on COD and 4-chlorophenol removals in an activated sludge unit

Cited by 12 publications

References 34 publications

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Kinetic studies on agrochemicals wastewater treatment by aerobic activated sludge process at high MLSS and high speed agitation

Kinetic Study and Modeling of Aerobic Biological Oxidation of Organic Wastewater

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