sewage methane Articles

  • Sewage sludge treatment: evaluation of the energy potential and methane emissions with COD balancing

    Sewage sludge is an important resource for the generation of electricity and heat within a wastewater treatment plant (WWTP). Taking a holistic approach to such use involves considering the greenhouse gas emissions. In particular, for anaerobic sludge treatment, methane emissions are a matter of concern. Therefore, the utilization of a carbon balance, based on the chemical oxygen demand (COD), ...


    By IWA Publishing

  • Influence of conditioning agents and enzymic hydrolysis on the biochemical methane potential of sewage sludge

    Biochemical methane potential (BMP) tests have been carried out on sewage sludge from two wastewater treatment plants to assess the effect of additives (FeCl3 and two cationic polyelectrolytes) used in sludge dewatering. BMP tests were also carried out on the concentrated solid phase from the enzymic hydrolysis pre-treatment (42 °C, 48 h). FeCl3 had no significant effect on ...


    By IWA Publishing

  • Analysis of methane emissions from digested sludge

    The energetic use of sewage sludge is an important step in the generation of electricity and heat within a wastewater treatment plant (WWTP). For a holistic approach, methane emissions derived from anaerobic treatment have to be considered. Measurements show that methane dissolved in digested sludge can be analyzed via the vacuum salting out degassing method. At different WWTPs, dissolved ...


    By IWA Publishing

  • Thermophilic anaerobic digestion of sewage sludge with high solids content

    The treatment performance of thermophilic anaerobic digestion (AD) of sewage sludge with high solids content was investigated with two laboratory-scale thermophilic anaerobic reactors (R1 and R2) with a feeding of pre-centrifuged sewage sludge. Reactor R1 was fed with sludge of 3.7% total solids (TS). The volatile solids (VS) removal ratio and methane yield in the stable state were ...


    By IWA Publishing

  • Good servant, bad master: sulfide influence on partial nitritation of sewage

    When applying partial nitritation (PN) to anaerobically pre-treated sewage, ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) will be exposed to dissolved sulfide and methane. Both sulfide and methane may inhibit nitrification. To gain knowledge necessary for sustaining PN under these conditions, we exposed an AOB enrichment and a mixed nitrifying culture to dissolved ...


    By IWA Publishing

  • A critical review of experimental and predicted methane generation from anaerobic codigestion

    Anaerobic digestion is increasingly being considered as a treatment option for an extensive range of waste biomass, due to the potential for energy recovery, in the form of methane production, and lower sludge volumes relative to aerobic treatment processes. Furthermore, when two substrates are codigested (i.e. digested together), added benefits are foreseeable, such as increased methane ...


    By IWA Publishing

  • Co-digestion of glycerine and sewage sludge to optimise green electricity production

    Sewage sludge and crude glycerine were co-digested in the mesophilic digester of Hoogstraten wastewater treatment plant. Additions of up to 1 kg of crude glycerine/(m³ reactor).(day) were done without significant operational problems. At higher dosage, severe digester foaming was observed. Methane production during co-digestion was up to 20% higher than what would be expected based ...


    By IWA Publishing

  • Effect of the addition of rice straw on microbial community in a sewage sludge digester

    Rice straw was added to a sewage sludge digester and its effects on methane production, dewatering characteristics, and microbial communities in the digested sludge were examined by a continuous digestion experiment under mesophilic conditions (35 °C). Stable gas generation was monitored in all digestion experiments. Methane yield from raw sludge, chopped rice straw and softened rice ...


    By IWA Publishing

  • Monitoring the oxygen content in bio-methane-to-grid supply

    Orbital utilise the EC91 ATEX oxygen analyser from Systech Illinois to accurately monitor the oxygen content in the purified bio-methane gas prior to it being injected into the national grid gas network In September 2010, Orbital installed the gas monitoring and treatment plant on the UK’s very first large-scale bio-methane-to-grid production facility. This site was designed specifically to ...


    By Systech Instruments Ltd

  • Gatineau Sewage Treatment Plant, Gatineau, Quebec, Canada

    Project No. 1 Industrial Boiler Application A FLU-ACE waste heat recovery system installed to process all flue gases from three boilers. The system recovers up to 3.5 mmBTU/h of waste heat which is re-used for heating the digester sludge. The main fuel for the boilers is recycled methane based sewage gas generated from the plant’s anaerobic digesters. 'The installation ...

  • Monitoring sewage sludge AD for Southern Water - Case Study

    To check sludge AD, Southern Water uses portable biogas analysers specially developed for AD biogas and based on proven methane and associated gas analysis equipment from Geotech. Southern Water has an important routine; every single day it checks the health of its sewage sludge anaerobic digesters on eighteen sites across Hampshire, IoW, Sussex and Kent. There, each day Southern Water ...

  • Anaerobic co-digestion of sewage sludge and primary clarifier skimmings for increased biogas production

    The objective of the study was to identify the impact of co-digesting clarifier skimmings on the overall methane generation from the treatment plant and additional energy value of the increased methane production. Biogas production from co-digesting clarifier skimmings and sewage sludge in pilot-scale fed-batch mesophilic anaerobic digesters has been evaluated. The digester was fed with ...


    By IWA Publishing

  • A laboratory assessment of the impact of brewery wastewater discharge on sulfide and methane production in a sewer

    The impact of brewery wastewater discharge on sulfide and methane production in a sewer was assessed. Experiments were carried out on laboratory scale sewer reactors consisting of both an experimental and a control reactor. The control reactor was intermittently fed with real fresh sewage while the experimental reactor was fed with a mixture of brewery and domestic wastewater at two different ...


    By IWA Publishing

  • Feasibility of bioflocculation in a high-loaded membrane bioreactor for improved energy recovery from sewage

    The feasibility of a high-loaded membrane bioreactor to improve methane recovery from sewage was investigated. Although the process needs further optimization, it already is feasible to recover at least 35% of the sewage COD. Important aspects for further research are the occurrence of membrane fouling, and the optimum process conditions for bioflocculation, i.e. the proper SRT/HRT ratio, ...


    By IWA Publishing

  • Grease waste and sewage sludge co-digestion enhancement by thermal hydrolysis: batch and fed-batch assays

    Grease waste (GW) is an adequate substrate for sewage sludge co-digestion since, coming from a waste water treatment plant, it has a high methane potential (489 NmLCH4/gVSin); however, no synergistic effect takes place when co-digesting with 52%VS grease. Conversely, thermal hydrolysis (TH) improves the anaerobic digestion of GW (43% higher kinetics) and biological sludge ...


    By IWA Publishing

  • Koyambedu Sewage Treatment Power Plant - Case Study

    Established in 1979, Enviro Control Associates (I) Pvt. Ltd. is one of the leading Indian companies operating in the domain of Environmental Engineering. The company has a strong foothold in water treatment, sewage treatment, effluent treatment, municipal solid waste management, tertiary treatment and biogas based energy generation. Under the ...


    By Clarke Energy

  • Closed loop system takes manure and methane

    A CONVERSION plant in Mead, Nebraska is processing manure and methane to create ethanol and compost. According to Nebraska Governor Dave Heineman: “This plant sets a new standard for ethanol production in this state and our nation, and is an example of the innovation needed to take this industry to the next level. It lets America get its automotive fuel from the croplands of the Midwest instead ...


    By BioCycle Magazine

  • Sewage biogas fuels public transport buses in Oslo

    Bimethane produced by the Bekkelaget sewage treatment plant in Oslo, Norway, will begin fueling B0 public sector buses in 2009, marking a major step towards meeting its goal to reduce climate gas emissions 50% by the year 2030. Another 250 buses will be fueled by biomethane produced from two wet-organic waste separation plants scheduled to start up in 2011. Norway signed the Kyoto Protocol, an ...

  • Two-phase anaerobic co-digestion of food waste and sewage sludge

    The feasibility and performance of food waste and sewage sludge co-digestion were investigated to gain insight into their resource utilization. In this study, two-phase anaerobic digestion (TPAD) was operated under a total solids mixing ratio of 1:1 and different sludge retention times (SRTs). Results show that an acidogenic reactor with a 5-day SRT obtained the highest acidification efficiency, ...


    By IWA Publishing

  • Methane conversion efficiency as a simple control parameter for an anaerobic digester at high loading rates

    The anaerobic digestion process is globally applied to the treatment of highly concentrated wastes such as industrial and rural effluents, and sewage sludge. However, it is known to be relatively unstable. When loaded with high concentrations of organic material, unwanted volatile fatty acids (VFA) are often produced rather than methane (CH4) gas which can lead to digester acidification and ...


    By IWA Publishing

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