Anaerobic Digestion Articles

  • Residential SSO To High Solids Anaerobic Digestion

    Source separated organics, including kitchen and garden waste, are processed in a dry AD plant. Resulting biomethane is injected into an adjacent natural gas pipeline. Winterthur, a city in the canton of Zürich in northern Switzerland, has the country’s sixth largest population, estimated at more than 100,000. In 2011, the City of Winterthur launched a 2050 energy policy to ...


    By BioCycle Magazine

  • Effect of acetic acid in recycling water on ethanol production for cassava in an integrated ethanol–methane fermentation process

    Recently, the integrated ethanol–methane fermentation process has been studied to prevent wastewater pollution. However, when the anaerobic digestion reaction runs poorly, acetic acid will accumulate in the recycling water. In this paper, we studied the effect of low concentration of acetic acid (≤25 mM) on ethanol fermentation at different initial pH values (4.2, 5.2 or 6.2). At an initial pH ...


    By IWA Publishing

  • Anaerobic Digest

    Boulder, Colorado: U.S. Distributed Renewables Forecast Published Navigant Research, a market research and consulting firm in Boulder, recently published the “U.S. Distributed Renewables Deployment Forecast, 2016-2025.” The report notes that deployment of distributed renewables, such as wind, solar and anaerobic digestion facilities, in the U.S. has accelerated in the last ...


    By BioCycle Magazine

  • Anaerobic digestion of sludge differing in inorganic solids content: performance comparison and the effect of inorganic suspended solids content on degradation

    High inorganic suspended solids (ISS) content of sludge in many areas (especially with combined sewage systems) results in low VS/TS (volatile solids, VS; total solids, TS) levels and raises concerns about its effect on anaerobic digestion. The performances of sludge anaerobic digestion with different feeding VS/TS levels as well as the effect of ISS content on the anaerobic degradation ...


    By IWA Publishing

  • Editorial: Going For Gold

    Production of August BioCycle overlaps with the Summer Olympic games in Rio. Watching athletes from around the world put themselves out there in hopes of winning the gold is inspiring, sometimes breathtaking. The rigor of training, the intensity of competition, the dedication and discipline — are there parallels to our world of organics recycling? First there is the obvious. Retail compost ...


    By BioCycle Magazine

  • Golf and a Small Anaerobic Digester

    Golf course associations and golf clubs around the world are looking at ways to improve the sport’s environmental criteria.  Sustainable developments and low carbon footprint operations are the name of the game.  As golf courses use fertiliser for the courses, power for the maintenance machinery, and power for the golf carts, there are many areas where sustainability of the sport ...


    By SEaB Energy Ltd.

  • Use of real-time PCR with propidium monoazide for enumeration of viable Escherichia coli in anaerobic digestion

    A combination of propidium monoazide (PMA) with real-time quantitative polymerase chain reaction (PMA-qPCR) was optimized to enumerate only viable Escherichia coli in anaerobic digestion processes. Repeating the PMA treatment twice and a final concentration of 100 μM resulted in an effective exclusion of DNA from heat-treated E. coli cells. In three anaerobic digestion ...


    By IWA Publishing

  • Industry Responds To Revised European Parliament Report On Waste Legislation

    On June 9, 2016, European Bioplastics (EUBP) announced the support of a European Parliament (EP) report emphasizing the role of bioplastics in the creation of a circular bioeconomy. The report, produced by Italian MEP Simona Bonafè¨, outlines legislation that is ...


    By Bergeson & Campbell, P.C.

  • Mathematical models and bacterial communities for ammonia toxicity in mesophilic anaerobes not acclimated to high concentrations of ammonia

    In this study, we evaluated ammonia toxicity in mesophilic anaerobic digestion at various pH values and total ammonia nitrogen (TAN) concentrations. We performed anaerobic toxicity assays (ATAs) to evaluate the toxicity effects of TAN and pH on mesophilic anaerobic digestion. Modeling based on the results of the ATAs indicated that the specific methanogenic activity (SMA) decreased by 30% at a ...


    By IWA Publishing

  • Prokaryote community dynamics in anaerobic co-digestion of swine manure, rice straw and industrial clay residuals

    The aim of this study was to analyze the effect of the addition of rice straw and clay residuals on the prokaryote methane-producing community structure in a semi-continuously stirred tank reactor fed with swine manure. Molecular techniques, including terminal restriction fragment length polymorphism and a comparative nucleotide sequence analyses of the prokaryotic 16S rRNA genes, were ...


    By IWA Publishing

  • BioCycle Portals To Organics Recycling In U.S. & Canada

    Updated BioCycle FindAComposter.com and the brand new BioCycle FindADigester.com and FindOrganicsHauler.com are launched and open for listings. In April 2007, BioCycle launched FindAComposter.com®, a publicly searchable database of composting facilities in the United States and Canada. The intent was to make it easy to find composting facilities to divert organic waste streams as well as buy ...


    By BioCycle Magazine

  • Influence of different anoxic time exposures on active biomass, protozoa and filamentous bacteria in activated sludge

    Medium-sized wastewater treatment plants are considered too small to implement anaerobic digestion technologies and too large for extensive treatments. A promising option as a sewage sludge reduction method is the inclusion of anoxic time exposures. In the present study, three different anoxic time exposures of 12, 6 and 4 hours have been studied to reduce sewage sludge production. The best ...


    By IWA Publishing

  • Treatment of corn ethanol distillery wastewater using two-stage anaerobic digestion

    In this study the mesophilic two-stage anaerobic digestion (AD) of corn bioethanol distillery wastewater is investigated in laboratory-scale reactors. Two-stage AD technology separates the different sub-processes of the AD in two distinct reactors, enabling the use of optimal conditions for the different microbial consortia involved in the different process phases, and thus allowing for higher ...


    By IWA Publishing

  • Effect of solid-state NaOH pretreatment on methane production from thermophilic semi-dry anaerobic digestion of rose stalk

    The effects of solid-state NaOH pretreatment on the efficiency of methane production from semi-dry anaerobic digestion of rose (Rosa rugosa) stalk were investigated at various NaOH loadings (0, 1, 2, and 4% (w/w)). Methane production, process stability and energy balance were analyzed. Results showed that solid-state NaOH pretreatment significantly improved biogas and methane yields of 30-day ...


    By IWA Publishing

  • United Utilities, Davyhulme WWTW, CHP Plant - Case Study

    At the Davyhulme wastewater treatment works (WWTW) in Greater Manchester, United Utilities is generating renewable energy from sewage gas that is created from sludge left behind after the treatment of wastewater. The produced energy is used to power the local plant and provide high levels of efficiency through ...


    By Clarke Energy

  • Sewage sludge pretreatment by microwave irradiation combined with activated carbon fibre at alkaline pH for anaerobic digestion

    This research focuses on the effects of microwave-assisted activated carbon fibre (ACF) (MW-ACF) treatment on sewage sludge at alkaline pH. The disintegration and biodegradability of sewage sludge were studied. It was found that the MW-ACF process at alkaline pH provided a rapid and efficient process to disrupt the microbial cells in the sludge. The results suggested that when irradiated at ...


    By IWA Publishing

  • GTI Cover at Pinnacle Foods Harnesses Energy from Anaerobic Digestion

    The Customer: Pinnacle Foods is a leading producer of quality branded food products, which can be found in 85 percent of American households. The Customer’s Needs: When Pinnacle Foods’ acquired the Wish Bone® and Western® salad dressing businesses, its production plant in St. Elmo, Illinois, USA, would need to expand for additional flow. ...

  • Case study - React Environmental use GA3000 to measure methane

    About the customer React Environmental anaerobic digestion plant in Carmarthenshire, Wales, handles up to 5,000 tonnes of food waste a year. The Geotech product The company uses Geotech's GA3000 (now superseded by GA3000 PLUS) fixed biogas analyser to monitor methane, carbon dioxide, oxygen and hydrogen sulphide.  React's Arrash Shirani talks about ...


    By Geotech

  • Anaerobic Digest

    Wilsonville, Oregon: Food Scraps Digester Proposed An anaerobic digester with capacity to process 50,000 to 70,000 tons/year of commercial food waste is being proposed in Wilsonville by Sustainable Organics Recycling Technology (SORT) Bioenergy. Wilsonville is in the Portland metro area. Currently, a portion of commercial food scraps from the metro area are hauled to the ...


    By BioCycle Magazine

  • Semi-continuous mesophilic anaerobic co-digestion of thermally pretreated scum

    The objective of this study is to investigate the mesophilic, anaerobic, co-digestion of scum with thickened waste activated sludge (TWAS) and primary sludge (PS). Observations of the reactor waste show that higher pretreatment temperatures assist in scum integration and appear to limit coagulation and separation effects associated with digesting fats, oils and greases. The 0.40 kg VS/m3 · d ...


    By IWA Publishing

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