biodegradation kinetics Articles

  • Intrinsic Biodegradation Kinetics Of Chemicals

    Intrinsic Biodegradation Kinetics Of Chemicals An understanding of the rate of biodegradation kinetics for specific industrial chemicals is useful when evaluating their treatability or their impact on treatment processes. The objective of kinetic assessments usually is to model the biodegradation reactions for specific chemicals using either pure cultures or defined ...


    By Challenge Technology

  • Oxygen and temperature kinetics of aerobic solid-state Biodegradation

    Rates of decomposition are of critical interest to operators of most biodegradation processes, since they determine the length of time the process must continue to achieve a particular extent of decomposition. While the goals of the decomposition process vary widely, ranging from reduction of odors or contaminants to production of high valueadded products, most of these goals are impacted by the ...


    By ORBIT e.V.

  • Kinetic evaluation for aerobic biodegradation of resorcinol in a batch reactor

    Mixed microbial cultures contained in the sludge of effluent treatment plant of a coke oven industry have been studied for its resorcinol biodegradation capacity under aerobic environment. The result showed that, after necessary acclimatisation, the culture was able to biodegrade up to a concentration of 500 mg/L of resorcinol in the substrate. The specific growth rate of microorganisms was found ...


    By Inderscience Publishers

  • Extant Kinetics Of Mixed Wastewaters

    Extant Kinetics Of Mixed Wastewaters OUR fingerprints can be used to estimate kinetic parameters for the wastewater constituents as shown in Figure A and B below. Wastewater A contained one group of readily degraded compounds and one group that was degraded at lower rates. A third region of oxygen uptake was caused by nitrification. Kinetic modeling suggested that biodegradation of each ...


    By Challenge Technology

  • The evaluation of benzene and phenol biodegradation kinetics by applying non-structured models

    The biodegradation kinetics of the aromatic hydrocarbons benzene and phenol as single substrates and as a mixture were investigated through non-structured model analysis. The material balance equations involving the models of Monod and Andrews and representing the biodegradation kinetics of individual substrates in batch mode were numerically solved. Further, utilization of a benzene–phenol ...


    By IWA Publishing

  • Biodegradation of Bisphenol-A in aerobic membrane bioreactor sludge

    Bisphenol-A (BPA) biodegradation was studied in a membrane bioreactor under aerobic conditions. The effects of the initial BPA concentration and initial chemical oxygen demand (COD) concentration on BPA biodegradation were investigated. The degradation process followed a first-order kinetic (more than 98% of BPA was removed) with a kinetic rate constant of 1.134 h−1 using an ...


    By IWA Publishing

  • A comparison of biodegradation kinetic models applied to estrogen removal with nitrifying activated sludge

    The biological degradation of estrone (E1), estradiol (E2) and ethinylestradiol (EE2) was studied in batch experiments at typical concentration levels using nitrifying activated sludge from a membrane bioreactor (MBR). Since first-order, pseudo first-order and Monod-type kinetics were observed. Pseudo first order kinetic was reformulated using only the soluble concentrations S and assuming ...


    By IWA Publishing

  • A comparison of biodegradation kinetic models applied to estrogen removal with nitrifying activated sludge

    The biological degradation of estrone (E1), estradiol (E2) and ethinylestradiol (EE2) was studied in batch experiments at typical concentration levels using nitrifying activated sludge from a membrane bioreactor (MBR). Since first-order, pseudo first-order and Monod-type kinetics were observed. Pseudo first order kinetic was reformulated using only the soluble concentrations S and assuming ...


    By IWA Publishing

  • Biodegradability of industrial textile wastewater – batch tests

    Following new trends we applied oxygen uptake rate (OUR) tests as well as long-term tests (in two batch bioreactors systems) in order to assess the biodegradability of textile wastewater. Effluents coming from a dyeing factory were divided into two streams which differed in inorganic and organic contaminants loads. Usefulness of the stream division was proved. Biodegradation of the low-loaded ...


    By IWA Publishing

  • Size-dependent microbial substrate uptake kinetics for aerobic granules

    Biodegradation kinetics of aerobic granules determined by indirect method of resporimetric technique showed that it followed Monod kinetics, and the kinetic behaviour was size-dependent. It was further demonstrated that biodegradation kinetics was a surface reaction associated phenomenon. It shows that the affinity coefficient of biomass to substrate in terms of ...


    By Inderscience Publishers

  • Kinetic study of compost liquor nitrification

    This study is a first kinetic approach about the compost liquor treatment by activated sludge. This industrial wastewater is highly loaded in organic and nitrogen compounds (COD≈12,000 mg L−1 and NH4+-N≈4,000 mg L−1). The possibility of its treatment in an urban WWTP is studied measuring ammonia oxidation rate with non-acclimated sludge to the industrial effluent. Compost liquor appears as an ...


    By IWA Publishing

  • Reactor modeling in heterogeneous photocatalysis: toxicity and biodegradability assessment

    Photocatalysis employing titanium dioxide is a useful method to degrade a wide variety of organic and inorganic pollutants from water and air. However, the application of this advanced oxidation process at industrial scale requires the development of mathematical models to design and scale-up photocatalytic reactors. In the present work, intrinsic kinetic expressions previously obtained in a ...


    By IWA Publishing

  • Biosorption and biodegradation of trichloroethylene by acclimated activated sludge

    The biosorprion and biodegradation of trichloroethylene (TCE) was investigated. The experimental results showed that at 25°C the adsorption equilibrium of TCE at concentrations from 10 mg/L to 200 mg/L could be described by the Freundlich isotherm. Adsorption could complete within 15 min. Results indicated that glucose could serve as a co-substrate and enhance TCE biodegradation through ...


    By Inderscience Publishers

  • Methane production and hydrolysis kinetics in the anaerobic degradation of wastewater screenings

    Anaerobic biodegradability and hydrolysis rates of wastewater screenings were determined using the biochemical methane potential test at 37 °C. The extent and rate of screenings conversion to methane of this complex and particulate substrate were investigated and since two stages of hydrolysis were identified, corresponding to the different types of materials in screenings, a linear and ...


    By IWA Publishing

  • Anaerobic biodegradability of fish remains: experimental investigation and parameter estimation

    The generation of organic waste associated with aquaculture fish processing has increased significantly in recent decades. The objective of this study is to evaluate the anaerobic biodegradability of several fish processing fractions, as well as water treatment sludge, for tilapia and sturgeon species cultured in recirculated aquaculture systems. After substrate characterization, the ultimate ...


    By IWA Publishing

  • Modified kinetic-hydraulic UASB reactor model for treatment of wastewater containing biodegradable organic substrates

    This paper addresses a modified kinetic-hydraulic model for up-flow anaerobic sludge blanket (UASB) reactor aimed to treat wastewater of biodegradable organic substrates as acetic acid based on Van der Meer model incorporated with biological granules inclusion. This dynamic model illustrates the biomass kinetic reaction rate for both direct and indirect growth of microorganisms coupled with ...


    By IWA Publishing

  • Temperature effects on biodegradation kinetic parameters and settling characteristics of activated sludge treating pulp and paper wastewater

    The proposed process modifications of the pulp and paper mill made it necessary to evaluate the effect of alteration in local wastewater treatment facility owing to increased temperature, increased flow, and higher organic loading. The settleability of the MLSS was evaluated as a function of the elevated operating temperatures. The SVI values at 25- 40 °C were between 115-173 mL/g which is higher ...

  • Temperature–dependent polylactic acid (PLA) anaerobic biodegradability

    Polylactic acid (PLA) biodegradability is mostly claimed according to PLA biodegradation behaviour under aerobic composting conditions. However, waste materials containing PLA are frequently disposed of in municipal landfills, which are operated anaerobically. PLA anaerobic sludge digestion results are acquired to elucidate effects of the degrading temperature on PLA biodegradation. When the ...


    By Inderscience Publishers

  • Study of kinetics of degradation of cyclohexane carboxylic acid by acclimated activated sludge

    Activated sludge contains complex microorganisms, which are highly effective biodegrading agents. In this study, the kinetics of biodegradation of cyclohexane carboxylic acid (CHCA) by an acclimated aerobic activated sludge were investigated. The results showed that after 180 days of acclimation, the activated sludge could steadily degrade >90% of the CHCA in 120 h. The degradation of CHCA ...


    By IWA Publishing

  • Extent and rate of biodegradation of different organic components in municipal solid waste

    Rates and extent of biodegradability of four different organic components of municipal solid waste (leaf litter, newspaper, magazine paper and A4 sheet) were evaluated under optimum conditions. Total solids (TS) removals in biotic samples ranged from 74.7% to 78.8% while volatile solids removals ranged from 75.7% to 84.8%. Significant biodegradation of tannin–lignin was observed for all four ...


    By Inderscience Publishers

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