anaerobic digestion system Articles

  • 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

  • Bio-fuels- Anaerobic digestion

    Anaerobic digestion is a series of processes in which micro organisms break down biodegradable material in the absence of oxygen. It is widely used to treat wastewater sludges and organic (agricultural) wastes.  As part of an integrated waste management system, anaerobic digestion reduces the emission of gas into the atmosphere. Anaerobic digestion is a renewable energy source because the ...


    By Triangle Ltd

  • Advances in Thermophilic Anaerobic Digestion

    ABSTRACTSignificant advances have been made in the knowledge base and practical options for improving thermophilic anaerobic digestion over the past 10 to 15 years. Today, more options exist that promise to enhance the degree of stabilization achieved and finished product quality in new and retrofitted existing processes. In parallel, the body of knowledge regarding pathogen inactivation in these ...

  • Anaerobic digestion in the United Kingdom

    Anaerobic digestion (AD) has been used to treat sewage sludge by the United Kingdom’s (UK) water industry for over 100 years. More recent years have seen a revolution as AD has swiftly expanded into agricultural feedstocks and food waste. Data from the Waste Resource and Action Programme (WRAP) shows that in the past year alone, there has been a 46 percent growth in the size of the sector. ...


    By BioCycle Magazine

  • CH#1138 - Anaerobic Digesters

    Waste Type: Fats, oils and grease (FOG) in Anaerobic Digesters Problem: FOG waste poses a challenge for most municipal wastewater collection systems and treatment plants. Although fats, oils and grease will biodegrade in an anaerobic digester, high concentrations will tend to 'mat' on the sludge surface, lowering digestion efficiency. This Midwestern municipal facility was no different. The 1.5 ...


    By BIO-SYSTEMS International

  • Anaerobic Digestion—What Are the Economics?

    Although solid waste AD facilities are just starting to emerge, haulers and their customers may see some benefits if the development trend continues. A Pro Forma Model objective can be constructed for strategic planning of an anaerobic digestion facility. Anaerobic digestion (AD) of food wastes in the U.S. is a developing market that is poised for continued growth in many regions. ...


    By Waste Advantage Magazine

  • Operational Experience of Advanced Anaerobic Digestion

    Abstract Anaerobic processes have been used in wastewater treatment systems for more than a century. Initially they were used to stabilise the solids produced, and generally consisted of simple concrete tanks in which the solids were placed as thin slurry and allowed to decompose anaerobically. However, using advanced pre-treatment processes in conjunction with traditional anaerobic ...


  • The dirty little secret of anaerobic digesters

    First, I want to state that I am a firm believer in the benefits of anaerobic digesters as both technologies to reduce solid wastes, and also as means of creating clean, renewable fuel. With the abundance of animal and vegetable wastes clogging landfills and polluting rivers and aquifers, plus the rising cost of power, the non-use of anaerobic digesters (both as a revenue generator and a cost ...


  • Anaerobic digestion in Sweden - status and experiences

    The implementation of biogas technology has in general increased in Sweden over the last 4-5 years. The main reason for this development is the effort to replace landfilling of nutrient-rich, wet organic waste with sustainable alternatives. In accordance with the EU directive on landfilling, a tax on putting organic waste into landfills will be introduced the 1st of January 2000, together with a ...


    By ORBIT e.V.

  • Anaerobic digestion system for dairy farm wastes

    On of the critical problems in dairy farms is the management of animal wastes. The first negative impact of manure and other animal wastes is emission of malodor and air pollutants and furthermore attraction of insects that may correspond to spreading of pathogens and emerging epidemic diseases. The secondary impacts of un-controlled release of manure and animal wastes are pollution of soil and ...


  • Improved Anaerobic Digestion Feed Systems and Concepts

    The sludge feed systems for anaerobic digestion facilities at wastewater plants in North America have been and continue to be modified and upgraded for a variety of reasons. These reasons include operational problems and issues, evolution from prior primary-sludge-only digestion facilities, performance-based reasons, regulatory-based reasons, and include the desire to improve the digestion ...

  • Foaming during anaerobic digestion: Causes and Solutions

    Foaming during sludge treatment has traditionally been associated with activated sludge systems which have been victim to this phenomenon for several decades. However, foaming has been documented in anaerobic digestion plants, leading, fundamentally, to a reduction in digester capacity and an increase in operational expenditure. The requirements for foaming of: surface active agents, gaseous ...


    By United Utilities

  • Bintulu Anaerobic Digestion Plant Now Complete

    BIODOME® ASIA, part of KIRK GROUP, has recently completed a state-of-the-art anaerobic digestion plant in East Malaysia for our client Kubota Corporation, consisting of the largest digester tank ever built by KIRK to date which has a capacity in excess of ...

  • Toronto moves forward with anaerobic digestion of residential SSO

    In June 2007, Toronto's City Council approved the “Target 70” plan to achieve 70 percent diversion by 2010. Target 70 includes construction of two, 55,000 metric tons/year anaerobic digestion plants to process residential source separated organics (SSO). City Council says that the digester facilities, along with adoption of single stream recycling and a pay-as-you-throw funding system, will ...


    By BioCycle Magazine

  • Nitrification of centrate from dewatering of anaerobically digested sludge

    Nitrification of anaerobically digested sludge centrate was studied in bench-scale suspended growth and fixed film enhanced suspended growth systems at temperatures of 10.5-28.5°C and pH values of 6.0-9.1. Nitrification followed zero-order kinetics in both systems, and ammonia removals in excess of 99% were observed. The temperature dependency of the suspended growth nitrification rate ...


    By Inderscience Publishers

  • Managing Compostable Bags At Anaerobic Digestion Plants

    The highest and best use for treating residential food waste is through source separation, sending organics first to anaerobic digestion (to capture energy), followed by aerobic composting (to return nutrients to the soil). Sending food waste to anaerobic digestion (AD) facilities requires appropriate tools and planning for capturing high volumes of material with low contamination. Compostable ...


    By BioCycle Magazine

  • Peristaltic Pumps excel in Anaerobic Digestion & Biogas applications

    Biogas is a natural gas also known as biofuel or biomass and is produced by breaking down organic material such as household waste, manure and crops grown specifically for biofuel with temperature-sensitive microbes and capturing the by-products. In practice, it is difficult to find a pumping system for this application. Why? The pumps needs to handle fluid media as well as gas parts ...

  • The Effect of the Microsludgetm Treatment Process on Anaerobic Digestion Performance

    ABSTRACT Thickened waste activated sludge (TWAS) from biological treatment processes is less amenable to anaerobic digestion than primary sludge. This is due to TWAS being composed mostly of cellular material and extracellular polymeric substances (EPS) instead of more easily digestible carbohydrates and fats that are typically found in primary sludge. In an attempt to improve TWAS digestion ...

  • 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

  • Restoration of Active Anaerobic Digestion in Charleston, West Virginia

    The upgrade to the Charleston, West Virginia wastewater treatment plant is a 50-million dollar project that is being conducted in two phases. The first phase of the project included specific unit processes at the plant that were failing or causing significant operational impairments. This first phase included the emergency renovation of four (4) existing anaerobic digesters that at the onset of ...

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