Anaerobic Digestion                                      
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Project at a Glance Contents on the CD ROM
  • Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen, used for industrial or domestic purposes to manage waste and/or to release energy.
  • AD produces a biogas made up of around 60 per cent methane and 40 per cent carbon dioxide (CO2).
  • Anaerobic digestion is widely used as a source of renewable energy.
  • The process produces a biogas, comprising of methane and carbon dioxide. This biogas can be used directly as cooking fuel, in combined heat and power gas enginesor upgraded to natural gas quality biomethane.
  • Anaerobic digestion is a simple process that can greatly reduce the amount of organic matter, which might otherwise be destined to be dumped at sea, landfilled or burnt in an incinerator.
  • AD is a waste treatment that powers itself. Using AD to treat sewage waste reduces CO2 emissions by 16 per cent compared to conventional sewage treatment techniques.
  • AD is widely used as part of the process to treat waste water. As part of an integrated waste management Waste management system, anaerobic digestion reduces the emission of landfill gas Landfill gas into the atmosphere.
  • The digestion process begins with bacterial hydrolysis of the input materials in order to break down insoluble organic  polymers such as carbohydrate and make them available for other bacteria. Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. Acetogenic bacteria then convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide. Finally, methanogens convert these products to methane and carbon dioxide.
  • Anaerobic digestion can be inhibited from reaching the methanogenic stage. The organic acids (i.e., carboxylic acids) from the acidogenic and acetogenic stages of the digestion can be recovered. The acids can then undergo further chemical transformations into useful chemicals or fuels.
  • As anaerobic digestion is a renewable source of methane it offers the potential to contribute to the hydrogen economy.
  • The United States produces nine million tons of hydrogen per year, mostly with steam reforming of natural gas. This process is different from catalytic reforming, an oil refinery process that also produces significant amounts of hydrogen along with high octane rating gasoline.
  • Anaerobic decomposition is the reduction of the net energy level and change in chemical composition of organic matter caused by microorganisms in an oxygen-free environment.
  • The waste is washed into the lagoon by flushing the animal pens with water. Solid waste, particularly the fibrous type of cows, is sometimes separated before the wastewater enters the lagoon to prevent the buildup of solid material.
  • Anaerobic digesters help to reduce greenhouse gas emissions both directly and indirectly. Digesters capture and destroy
    methane, a potent greenhouse gas, that would otherwise be released directly to the atmosphere.
  • The biogas captured by digesters can also be used to generate electricity.
  • In 2010, digesters produced the equivalent of approximately 453 million kilowatt-hours (kWh) of energy, enough to supply more than 25,000 average American homes for a year.
  • The use of household biogas is most widespread in Asia.
    In China, over 15 million households use biogas, and successful programmes have been established in Nepal and Vietnam.
  • In Sichuan Province alone, 2.58 million domestic biogas
    plants had been constructed by the end of 2004.This number will be increased to 5 million by the end of 2010.
  • Farms are installing digesters to help meet
    their waste storage and energy needs, as well as for the systems environmental benefits. The total number of systems operating has grown steadily over the last decade, with an average of 15 new digesters coming on line each year. In 2010, 13 new digester projects became operational.
  • In India - About 150 biomethanation units using biogas generated from distillery effluents for heat and power applications
    Mostly UASB technology used for biomethanation
  • An estimated 162 anaerobic digestion systems for live-
    stock manure were operating in the United States by the
    end of 2010.
  • EPA estimates that 157 digester projects are operating on commercial scale livestock facilities nationwide - July 2010
General Information
  • Anaerobic Digestion Basic
  • Anaerobic Digestion (AD)
  • Basics of AD
  • Old History for AD
  • Types of AD
  • Benefits & History of AD
  • Comparison of anaerobic and anaerobic digestion
  • A glance - AD
  • AD general Information
Fact Sheet
  • Fact Sheet for AD
  • AD basic facts
  • AD Quick Facts
  • AD information sheet
  • About Anaerobic Digestion
  • AD facts - organic waste
  •  FAQs about AD
  • AD –  Good Strategy or a Sustainable Manure Management Solution?
Fact Sheet
  • AD Process Flow Chart
  • Flow Diagram for an Agricultural AD Installation
  • AD organic waste process
  • Anaerobic Digestion Steps
  • AD Water treatment process


  • Company from USA
  • Company from Switzerland
  • Company from USA
  • Company from Ireland
  • Industry Directory for
    On-Farm Biogas Recovery


  • Consultancy from Belgium
  • Consultancy from France
  • Consultancy from UK
  • Consultancy from China
  • Consultancy from USA


  • Anaerobic Digestion Diagram
  • AD Technology
  • AD from Haase
  • Anaerobic digestion facility
  • AD (Methane recovery) works
  • Stages of AD
  • Treatment of textile sludge using anaerobic technology
  • Decomposition Pathways of activated sludge by  AD
  • AD - organic waste


  • AD from UK
  • AD from spain
  • AD Tanks
  • Electrolytically-enhanced
    anaerobic digestion (eAD)
  • Hydrogen sulphide scrubbers


  • Anaerobic Digestion
  • AD  method
  • AD System
  • Two phase AD
  • Anaerobic digestion process
  • AD system and process
  • AD of fish wastes
  • Fixed-film anaerobic digestion of flushed waste
  • Anaerobic digestion process for organic wastes
  • Anaerobic digestion process for low-solid waste
  • AD apparatus, methods for AD and for minimizing the use of inhibitory polymers in digestion
  • AD process of wastes containing cellulose
  • AD  technology


  • AD of Cellulosic wastes
  • AD of Thin Stillage to Produce Methane and Class-A Biosolids
  • AD - Cow Diary farm
  • Reduction of cyanide levels during AD
  • AD for Energy and Pollution Control
  • AD of Carbohydrate and protein based wastewaters in fluidized bed bioreactors
  • Food Waste Disposal Using Anaerobic Digestion
  • AD option for industrial waste water
  • Enhancement of AD of Nile perch fish processing wastewater
  • AD for Enhanced Solids and Nitrogen Removal
  • Enhanced Nutrients Removal in Conventional
    AD Processes
  • AD of olive mill wastewater
  • Implementation of an UASB AD at bagasse-based pulp and paper industry
  • Anaerobic digestion of solid fraction of pig slurry
  • AD - controlled temperature
  • AD of Wastewater Sludge
  • Winery and distillery waste water treatment by AD
  • AD Process for
    Producing Biogas
  • AD Process of Organic Fraction of Municipal Solid Waste
  • AD Process Selection at Blue Plains AWWTP
  • Anaerobic Digestion (AD)Process
  • Stoichiometry of the AD Process
  • AD treatment Process
  • AD process


  • Effect of Fluctuating Temperature Regime on Psychrophilic Anaerobic Digestion of Night soil
  • Effect of AD on Oocysts of the Protozoan Eimeria tenellat
  • Effect of Buffer and Waste Type in High Solid Thermophilic AD
  • Effect of Ultrasonic Irradiation on the AD


  • Toxic Substances in AD
  • Environmental fact on AD
  • Metabolic Activity of Pathogenic Bacteria during Semi continuous Anaerobic Digestion
  • Anaerobic co-digestion of high strength / toxic organic liquid effluents in a stirred reactor
  • Bioaugmentation for Improved Recovery of AD After Toxicant Exposure
  • Bioavailability and Toxicity of Metal Nutrients during AD
  • Biological inhibition / toxicity control in municipal AD facilities
  • Modeling AD acclimatization to
    a biodegradable toxicant
  • Reduction of potassium toxicity by using sodium in a completely mixes AD
  • Advanced dynamical risk analysis for monitoring AD process
  • Regulations Covering AD


  • Anaerobic digestion heating
  • Agent Heterogeneity in
    Adoption of AD Technology
  • Key Elements of Biogas Energy Anaerobic Digesters
  • Evaluation of AD for diary cattle manure
  • Two-Phase AD for Class A Biosolids
  • Comprehensive study on a two-stage AD process
  • Biogas Technology - AD
  • Microbial Fuel Cells in Relation to Conventional AD Technology
  • Suggestions for improving AD of sugar mill effluents
  • Pre-treatment technologies to improve sludge AD
  • AD of Shrimp of Culture Pond Sediment in a Biogas Process
  • Mathematical model for AD by phase seperation
  • AD of source-separated organic waste in full-scale plants
  • Feedstocks for AD
  • Enhancement of AD of Sisal leaf
  • Technological Parameters of Exceed Sludge AD  in Industrial Wastewater Treatment Plant
  • Micro-scale AD of point source components of organic fraction
    of municipal solid waste
  • Modelling of AD - Review
  • Enhanced Nutrients Removal in Conventional AD Processes
  • Optimising anaerobic digestion
  • A pH-based control of ammonia in biogas during AD
  • Sensors for Anaerobic Digestion
  • Structure of a Cellulose Degrading Bacterial Community During AD

Report & Market

  • U.S. Farm Anaerobic Digestion Systems: A 2010 Snapshot
  • Biogas from anaerobic digestion rolls out across Asia
  • Biogas and Anaerobic Digestion
  • The challenges of anaerobic digestion
  • Anaerobic Digestion for Developing Countries with Cold Climates
  • U.S. AD Status Report
  • AD is Now Economically Viable
    in Europe
  • AD - Building an Industry in Ohio
  • Future for AD of Solid Waste
  • Anaerobic Digesters in India
  • AD of Biodegradable Solid Waste in Low- and Middle-Income Countries
  • Systems and Markets Overview of Anaerobic digestion
  • AD on the crossroads for México City sustentability
  • Organic Recycling for Renewable Energy Generation - AD
  • UK experience -Using AD in agriculture
  • Seeking options to Conventional anaerobic digestion
  • A Small Scale Anaerobic Digestion Operating in Ontario
  • Anaerobic Digestion Article
  • Economics of Anaerobic Digesters
  • On-farm AD biogas production in Pennsylvania - 30 yrs
  • AD methane to energy - a statewide assessment


  • Economic Feasibility Study of Colorado AD Projects
  • Diprowaste - enhanced production of methane from AD with pre-processed solid waste for renewable
  • AD and Energy Recovery Project
  • AD swine waste water treatment with on-site power bundled project
  • AD Capital Costs for Dairy Farms


  • KSTM AD Technology for Palm Oil Mill Effluent
  • Current AD Technologies Used for Treatment of Municipal Organic Solid Waste
  • Single-phase Complete-mix AD of Organic Fraction of Municipal Solid Waste
  • Advances and modern concepts in AD in and Biogas  Technology
  • AD technology for Biogas projects
  • Anaerobic Digester Technology
  • AD - an effective technology for Biofuel production
  • Current trends in AD
  • Colorado Agriculture IOF Technology Assessments: AD
  • AD of waste activated sludge with ultra sonic

AD Benefits

  • Anaerobic sludge digestion
  • Animal Waste AD Basics
  • Benefits of Anaerobic Digestion of Food Waste
  • Biological treatment - AD 
  • AD of Animal Manures
  • Biogas demonstration plant an AD technology
  • Fundamentals & Applications of AD
  • Commercialization of Anaerobic contact process for AD of algae
  • Dairy Waste AD
  • Control of AD process based on methane production
  • Nonlinear Identification of an Anaerobic Digestion Process


  • Supplier for AD
  • AD Supplier List
  • AD Suppliers
  • Suppliers for AD
  • AD Supplier List
  • AD Supplier

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