Farm Digester Progress In Pennsylvania
Pennsylvania has 30 dairy digesters, including the one shown at Oregon Dairy, as well as around 5 swine digesters. About 10 of those have been installed since 2010.

Deputy Secretary of Agriculture Jay Howes and Center for Dairy Excellence Director John Frey share insights on farm digester trends in the Keystone State.
Nora Goldstein
BioCycle May 2013, Vol. 54, No. 5, p. 26

 

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Art And Science Of Digester Heat Exchange
Combined heat and power (CHP) systems produce both thermal and electric energy. The unit selected is dependent on the amount of heat required and the goals of the AD facility.

Providing sufficient thermal energy is a fundamental requirement to successful AD operation. This primer reviews temperature requirements and methods to attain and maintain recommended values.
Kevin Jankowski
BioCycle May 2013, Vol. 54, No. 5, p. 36

 

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Connections: Kevin Bacon Compost Equivalents
Sally Brown

Sally Brown
BioCycle May 2013, Vol. 54, No. 5, p. 45

 

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Design Considerations In Covered Aerated Static Pile Composting
The Gore cover system uses fabric covers made of a layer of ePTFE (see close-up) sandwiched between two layers of polyester for structure.

Synthetic covers include polyethylene (PE) tarps, flexible vinyl fabrics, PE fleece blankets and expanded polytetrafluoroeth-ylene. Covers are used with both forced and induced aeration. Part III
Craig Coker and Tom Gibson
BioCycle May 2013, Vol. 54, No. 5, p. 21

 

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Anaerobic Digestion And Algal Raceway System
Figure 1. Flowchart of Novel Integrated Farm-Based Biorefinery

Michigan State University integrates AD with other biological processes to convert organic wastes into value-added fuels that are needed to enhance the economic and environmental performance of organic waste management.
Louis Faivor, Wei Liao and Dana Kirk
BioCycle May 2013, Vol. 54, No. 5, p. 29

 

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Codigestion Research Builds Facility Operator Confidence
Figure 2. Nutrient limits in food waste digestion

Research can improve the economic viability of codigestion facilities and ease concerns of managers of water reclamation facilities about receiving additional organic waste and the potential for digester upsets. Part II
David L. Parry
BioCycle May 2013, Vol. 54, No. 5, p. 32

 

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Illinois Compost Manufacturer Controls The Elements
To better control the composting process, a ClearSpan fabric building was installed. The building accommodates four 450-foot long windrows.

LHF Compost, Inc. in Peoria processes yard trimmings, food waste and manure. Recently, it erected a fabric building, and does active composting under roof.
Nora Goldstein
BioCycle April 2013, Vol. 54, No. 4, p. 26

 

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Food Waste Diversion At International Airport
PDX provides a central collection point for the food waste from the various restaurants. Diverted organics represent about 6 percent of materials recycled at the airport.

After significant program tweaks, including an employee rewards program, the Portland, Oregon International Airport breaks its previous records for food waste diversion.
Maia Nativ
BioCycle April 2013, Vol. 54, No. 4, p. 31

 

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Rural Communities And Single Stream Adoption
The typical rural community in New England has community transfer stations where there is no curbside recycling or trash collection. Households bring their recyclables to dropoff centers where they sort them by material.

Survey data shows households prefer transporting recyclables to the transfer station and sorting them there, and favor programs that increase the community recycling rate.
Christopher Wright and John M. Halstead
BioCycle April 2013, Vol. 54, No. 4, p. 40

 

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Implementation Realities Of Organics Ban In Massachusetts
Figure 1. Food waste generators in Massachusetts

Anticipated disposal ban on commercial and industrial organics is expected to be added to the state’s existing ban structure. The more pressing issues are ensuring robust generator training and hauling and processing capacity are in place to manage the materials. Part III
Zoë Neale
BioCycle April 2013, Vol. 54, No. 4, p. 34

 

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Improving Economics Of Codigestion
Figure 1. Organic waste tipping fee required based on electricity cost

The economics of an organic “waste to energy” facility are strongly dependent on the waste characteristics,
and costs of digestion and solids processing after digestion. Part I
David L. Parry
BioCycle April 2013, Vol. 54, No. 4, p. 48

 

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Residential Food Waste Collection In The U.S. — BioCycle Nationwide Survey
U.S. Food waste collection programs by number of municipalities and number of households

Growth of residential food waste collection in the U.S. is steady, with existing programs seeking to increase household participation.
Rhodes Yepsen
BioCycle March 2013, Vol. 54, No. 3, p. 23

This expanded online version included expanded tables with additional program details as well as additional information about municipal programs.

 

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Bioenergy Potential In California’s Food Processing Residues
Figure 1. California food processing facilities by county

Fruit and vegetable processing facilities and wineries are the largest sources of high moisture solid residues potentially available as bioenergy feedstocks.
Ricardo Amón, Mark Jenner and Stephen Kaffka
BioCycle March 2013, Vol. 54, No. 3, p. 47

 

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Integrating Greenhouse Facilities With AD Bioenergy
In the greenhouse, crop yield is strongly influenced by light, heat, water and nutrients. An AD bioenergy system can positively influence all of these factors.

To move forward with aaerobic digestion bioenergy projects, developers must find additional sources of bankable revenue such as greenhouse crop production.
Charles Egigian-Nichols
BioCycle March 2013, Vol. 54, No. 3, p. 40

 

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Managing Nutrient Release In Compost-Amended Bioswale Soils
Soils put into the columns were mixed at a base ratio of 40 percent compost to 60 percent silica sand by volume. Targeted PSI levels were achieved before additions of water to mimic two types of storm events.

Research shows adding water treatment residuals to a bioswale soil mix immobilizes nutrients in compost that might otherwise leach.
Katrina Mendrey
BioCycle March 2013, Vol. 54, No. 3, p. 36

 

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State Fertilizer And Soil Amendment Rules
BioCycle West Coast Conference 2013 Preview

Departments of Agriculture in every state regulate fertilizer and soil amendment sales/distribution, including compost and digestate products. Here’s a summary of the latest rule developments, FAQs and more.
Ron Alexander
BioCycle March 2013, Vol. 54, No. 3, p. 44

 

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Pipe And Blower Fan Fundamentals In ASP Design
Facilities can test various piping system designs, such as entrenching the pipes as shown in this pilot test (top). ASP composting designs most often use centrifugal blowers (bottom), as these are recommended for systems with back pressure caused by having long runs of piping or ducting

Effectiveness of aerated static pile composting depends largely on the aeration system, which can comprise a large portion of the facility’s cost and energy use. Part II
Tom Gibson and Craig Coker
BioCycle February 2013, Vol. 54, No. 2, p. 24

 

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Digester Taps Thermal Energy To Grow Greens
Neighborhood Farm is able to plant lettuce and cut greens for sale within three weeks. Radiant heat keeps the soil at 70° to 75°F

Vermont farm adds new revenue stream by installing greenhouse heated with thermal energy from the digester engine.
Nora Goldstein
BioCycle February 2013, Vol. 54, No. 2, p. 33

 

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The Massachusetts Waste Conundrum

With landfill capacity expected to decline to 600,000 tons in 2020 and combustion capacity remaining flat, a gap begins to emerge that may exceed 2 million tons a year by 2020 — depending on how successful the state is at improving the diversion rate. Part II
Zoë Neale
BioCycle February 2013, Vol. 54, No. 2, p. 35

 

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Bioenergy Policy Outlook For 2013
BioCycle Energy

New Production Tax Credit language in the last-minute tax compromise passed by Congress on January 1st is helpful to bioenergy projects, including anaerobic digesters.
Edward Niblock
BioCycle January 2013, Vol. 54, No. 1, p. 49

 

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