biomass hydrolysis Articles

  • Effect of initial biomass on cellulose hydrolysis by leachate communities

    Batch anaerobic digestions were performed in 160 ml serum vials, cellulose (1% wt) was the sole added carbon source. All reactors were inoculated with a 10% (v/v) leachate inoculum. The concentration of micro-organisms in the leachate inoculums was increased using centrifugation to investigate the effect of initial biomass on hydrolysis performance. The hydrolysis rate constant for digestions ...


    By Inderscience Publishers

  • Mass and energy balances in high dry solids digestion following thermal hydrolysis pre-treatment

    Contents of Presentation Reconciling biogas production with mass balances Classic VSR methods Interferences in classic methods in high DS% digestion COD and biogas approach KPI for advanced digestion Optimising energy balance for THP in CHP projects Maximising sources of heat Minimising uses of ...


    By Cambi Group AS

  • Using Anaerobic Biomass Digestion to Produce Hydrogen and Biofuel

    For many years, hydrogen has been considered as an alternative to fossil fuels. Now, Scientists are aiming to develop an environmentally friendly method to produce hydrogen from biomass by optimizing anaerobic digestion systems.1 Climate change, dwindling fuel resources and energy prices have spearheaded intensive efforts to detect and optimize ...


    By Edinburgh Sensors Ltd

  • Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates

    Various leachate recirculation strategies were applied to a batch-wise operated solid-phase digestion system in laboratory-scale tests. Comparative experiments with both continuous and intermittent leachate recirculation revealed no advantages of a continuous flow. Results suggest that leachate recirculation should not be carried out continuously during process initialisation when methanogenesis ...


    By Inderscience Publishers

  • Evaluation of a two-stage hydrothermal process for enhancing acetic acid production using municipal biosolids

    A two-stage hydrothermal process aimed at improving acetic acid production using municipal biosolids was evaluated against thermal hydrolysis and conventional wet oxidation process in a 600 ml Parr batch reactor. Thermal hydrolysis was conducted at 140 °C, wet oxidation at 220 °C and the two-stage process, which acted as a series combination of thermal hydrolysis and wet oxidation, at 220 °C. ...


    By IWA Publishing

  • Comparison of response surface methodology and artificial neural network for optimum levulinic acid production from glucose, empty fruit bunch and kenaf

    Levulinic acid (LA) is one of the versatile chemicals that can be produced from lignocellulosic biomass. In this study, response surface methodology (RSM) and artificial neural network (ANN) were applied to optimise LA yield from glucose, empty fruit bunch (EFB) and kenaf. The effect of process variables namely reaction temperature, reaction time and acid concentration on LA production was ...


    By Inderscience Publishers

  • Starch degradation and intermediate dynamics in flocculated and dispersed microcosms

    A large fraction of the organic substrate in municipal wastewater is particulate. Prior to uptake, particles have to be degraded through potentially a range of intermediates. However, research on intermediate dynamics during particle hydrolysis is limited. In this paper, batch experiments on flocculated and dispersed biomass microcosms using starch as particulate substrate are reported. ...


    By IWA Publishing

  • A theory of the lifecycle of bacteria

    Aims: The principal objective of this study was to investigate viability kinetics in aerobic AS (Activated Sludge). Methods and Results: A kinetic model was developed in order to predict viable cells, non-degraded dead cells and inert VSS (Volatile Suspended Solids) in a reactor – usually conventional models only predict active biomass and inert VSS. The following processes were considered in ...


  • 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

  • Temperature effects on the trophic stages of perennial rye grass anaerobic digestion

    Continuous Stirred Tank Reactors (CSTRs), operated in batch mode, were used to evaluate the feasibility of psychrophilic (low temperature) digestion of perennial rye grass in a long term experiment (150 days) for the first time. The reactors were operated in parallel at 3 different temperatures, 10, 15 and 37 °C. Hydrolysis, acidification and methanogenesis were assessed by VS degradation, by ...


    By IWA Publishing

  • A model for anaerobic ponds combining settling and biological processes

    This work presents an approach to an anaerobic pond model by combining the stoichiometry of the hydrolysis and acidogenic processes of the main constituents of wastewater, i.e. carbohydrates, proteins, and lipids, grouped as a ‘combined substrate’ with a previously published settling model (see ‘Suspended solids settling and half removal time in stabilization ponds ...


    By IWA Publishing

  • Rapid Gas Chromatographic Technique for the Determination of HYDROGEN in Reactor & Process Streams and Fuel-Cell Systems

    HYDROGEN is the most prevalent Element in the Universe… the “essence of Star Stuff” according to the late, great Carl Sagan. It is the ultimate “clean” fuel, with WATER as the predominant waste product… though care must be taken to minimize its unfortunate tendency to cause explosions. Hydrogen is formed in Nuclear Reactors, from low-efficiency Hydrolysis, in smaller amounts from natural Bio-Mass ...


    By Buck Scientific Inc

  • Multicomponent activated sludge model for reactors in series with recycling

    Multicomponent models containing both substrate and biomass have an advantage over conventional models in seeking better understanding of activated sludge systems. Such models are also useful in the characterisation of wastewater. Studies in recent years have shown that most of the soluble organic matter in the effluent of treatment systems consists of soluble microbial products that arise during ...


    By Inderscience Publishers

  • Beating treatment to enhance digestibility of fresh grass

    Anaerobic digestion (AD) is one of the most popular biomass conversion technologies. AD can be further divided into four stages: pre–treatment, digestion, gas upgrading and digestate. The main goal of pre–treatment is to improve degradability of the material in order to enhance gas production and anaerobic digester performance. Beating treatment as a new mechanical treatment technique has been ...


    By Inderscience Publishers

  • The effect of mixing conditions on anaerobic digester performance

    The basic principle of aerobic wastewater treatment is the conversion of some parts of organic matters to biomass and this causes production of excessive sludge in aerobic processes. This excessive sludge is withdrawn from time to time to prevent accumulation of biomass in aeration basin. In most cases, this sludge requires the stabilization before the dewatering and disposal. Different processes ...


    By ORBIT e.V.

  • Novel Hybrid PBR-UASB System for the Treatment of Highstrength Pet Food Wastewater

    ABSTRACTPet food industrial wastewater contains high concentration of oil and grease (O&G) which is difficult to treat using conventional biological systems. In this study, anaerobic treatability of pet food wastewater was evaluated in a hybrid packed bed reactor-upflow anaerobic sludge blanket (PBR-UASB) treatment system. The PBR was packed with sol-gel/alginate beads containing immobilized ...

  • Model assisted startup of anaerobic digesters fed with thermally hydrolysed activated sludge

    This paper presents the use of the IWA ADM1 to predict and interpret results from two full-scale anaerobic digesters fed with thermal hyrolysate (waste activated sludge with a long upstream sludge age) from a Cambi hydrolysis process operating at 165°C and 6 bar-g. The first digester was fed conventionally—though intermittently, while the second was heavily diluted through a substantial component ...


    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

  • Modeling organic nitrogen conversions in activated sludge bioreactors

    For biological nutrient removal (BNR) systems designed to maximize nitrogen removal, the effluent total nitrogen (TN) concentration may range from 2.0 to 4.0 g N/m3 with about 25–50% in the form of organic nitrogen (ON). In this study, current approaches to modeling organic N conversions (separate processes vs. constant contents of organic fractions) were compared. A new conceptual model of ON ...


    By IWA Publishing

  • Low-temperature limitation of bioreactor sludge in anaerobic treatment of domestic wastewater

    Two strategies exist for seeding low-temperature anaerobic reactors: the use of specialist psychrophilic biomass or mesophilic bioreactor sludge acclimated to low temperature. We sought to determine the low-temperature limitation of anaerobic sludge from a bioreactor acclimated to UK temperatures (<15 °C). Anaerobic incubation tests using low-strength real domestic wastewater (DWW) ...


    By IWA Publishing

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