January 5, 2018
NEDR #8    Sponsored by our website sponsors.
TOPIC:  ...Engines! 

What have we learned about buying, operating, & maintaining biogas engines in New England?
—Why choose an engine for biogas utilization? (compared to micro-turbines, etc.) - pros & cons
—Current options
—Greater Lawrence Sanitary District’s experience with recently purchasing, permitting, & installing 2 engines
—Essex Junction’s experience switching from micro-turbines to an engine, including start-up concerns & successes
—Operating & maintaining engines at Lewiston-Auburn WPCA
—Questions & Discussion

Slides presented at NEDR #8 - Engines! (PDF)
Audio recording of NEDR#8 webinar
   PART 1 - GLSD (MP3)
   PART 2 - Essex Junction (MP3)
   PART 3 - Lewiston-Auburn (MP3)

October 6, 2017
TOPIC: ADvancements in Mass & Around the Region

Presenter: James Doucett, Clean Energy Results Program Director, Mass DEP

Followed by a Roundtable of updates:  food waste processing facility in Charlestown, MA; the new digester complex at Johnston, RI; co-digestion & biogas management at Lewiston-Auburn, ME; and co-digestion ramping up at Greater Lawrence Sanitary District, No. Andover, MA.

Slides presented at NEDR #7
Notes, including Roundtable updates

NEDR #7 was sponsored by Wangen America.


July 7, 2017
TOPIC:  Digester Operations: Optimizing & Tracking Key Parameters

Presenter:  Chris Muller, Ph.D., P. E., Principal Engineer, Brown and Caldwell, Andover, MA.  Chris is a wealth of technical knowledge on anaerobic digestion and is continually involved in research to optimize digester operations. He's excited about digestion and looks forward to addressing your questions & challenges!

Slides presented by Chris Muller

NEDR #6 was sponsored by Huber Technology
Slides presented by Steve Macomber


April 7, 2017
TOPIC:  Types of "Wastes," Types of Digesters, Types of End Uses

Farm digesters & diverting food & other organics in Vermont

Presenter:  Alex DePillis, Senior Agricultural Development Coordinator; VT Agency of Agriculture, Food & Markets

Slides presented by Alex DePillis
Guidance: How to Send Food Processing Waste to On-Farm Anaerobic Digesters
VT Food Processing Waste Import Form for Farms



January 6, 2017
TOPIC: Digester cleaning & maintenance


  • Richard Weare, Capital Projects Manager, Greater Lawrence Sanitary Treatment District (GLSD), No. Andover, MA
    Richard has worked in operations at GLSD for many years, including during and since the commissioning of the District's three digesters in 2002.  He is overseeing the current installation of a fourth digester and combined heat & power (CHP) systems.
  • Paul Senesac III, President & CEO, P&H Senesac, Milton, VT
    Paul established P&H Senesac Inc in 1985, getting into the septic tank business and ultimately in the municipal & industrial waste treatment and cleaning business.  The company is now a nationwide service business providign solids dewatering, lagoon cleaning, and digester cleaning.

Weare presentation slides


October 7, 2016
TOPIC:  Co-Digestion Results in Net Energy Producer

Technical details of East Bay MUD's ground-breaking, net-zero digestion & energy systems. 

John Hake, who grew up in the Springfield, VT area, is the Manager of the Resource Recovery Program at East Bay Municipal Utility District (EBMUD) in Oakland, CA.  EBMUD was the first water resource recovery utility in the U. S. to reach net-zero energy production - and then net positive energy production.  They’re a leader in digestion, co-digestion, and energy generation.

Presentation slides
Notes from discussion


July 1, 2016

TOPIC: Co-Digestion: Adding outside feedstocks


  • Jim Jutras of Essex Junction, VT, which has processed in its digesters FOG, landfill leachate, food processing residuals, and more - for many years.
  • Mac Richardson, Lewiston-Auburn, ME, where, over the past year, they have begun experimenting with taking in outside feedstocks.

Presentation Slides (PDF)


April 1, 2016
TOPIC:  Introduction & Organization

A successful first NEDR webinar.
Resource links:
      American Biogas Council
      WEF biogas data
      EPA AgStar
         Biogas recovery
      EPA Region 9


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